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linux-next/arch/powerpc/kvm/book3s_mmu_hpte.c

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KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
/*
* Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved.
*
* Authors:
* Alexander Graf <agraf@suse.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/kvm_host.h>
#include <linux/hash.h>
#include <linux/slab.h>
sched/headers: Prepare to use <linux/rcuupdate.h> instead of <linux/rculist.h> in <linux/sched.h> We don't actually need the full rculist.h header in sched.h anymore, we will be able to include the smaller rcupdate.h header instead. But first update code that relied on the implicit header inclusion. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-02-04 08:27:20 +08:00
#include <linux/rculist.h>
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
#include <asm/kvm_ppc.h>
#include <asm/kvm_book3s.h>
#include <asm/machdep.h>
#include <asm/mmu_context.h>
#include <asm/hw_irq.h>
kvm: powerpc: book3s: pr: move PR related tracepoints to a separate header This patch moves PR related tracepoints to a separate header. This enables in converting PR to a kernel module which will be done in later patches Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Alexander Graf <agraf@suse.de>
2013-10-08 00:47:57 +08:00
#include "trace_pr.h"
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
#define PTE_SIZE 12
static struct kmem_cache *hpte_cache;
static inline u64 kvmppc_mmu_hash_pte(u64 eaddr)
{
return hash_64(eaddr >> PTE_SIZE, HPTEG_HASH_BITS_PTE);
}
KVM: PPC: Add book3s_32 tlbie flush acceleration On Book3s_32 the tlbie instruction flushed effective addresses by the mask 0x0ffff000. This is pretty hard to reflect with a hash that hashes ~0xfff, so to speed up that target we should also keep a special hash around for it. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:19 +08:00
static inline u64 kvmppc_mmu_hash_pte_long(u64 eaddr)
{
return hash_64((eaddr & 0x0ffff000) >> PTE_SIZE,
HPTEG_HASH_BITS_PTE_LONG);
}
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
static inline u64 kvmppc_mmu_hash_vpte(u64 vpage)
{
return hash_64(vpage & 0xfffffffffULL, HPTEG_HASH_BITS_VPTE);
}
static inline u64 kvmppc_mmu_hash_vpte_long(u64 vpage)
{
return hash_64((vpage & 0xffffff000ULL) >> 12,
HPTEG_HASH_BITS_VPTE_LONG);
}
KVM: PPC: Book3S PR: Allow guest to use 64k pages This adds the code to interpret 64k HPTEs in the guest hashed page table (HPT), 64k SLB entries, and to tell the guest about 64k pages in kvm_vm_ioctl_get_smmu_info(). Guest 64k pages are still shadowed by 4k pages. This also adds another hash table to the four we have already in book3s_mmu_hpte.c to allow us to find all the PTEs that we have instantiated that match a given 64k guest page. The tlbie instruction changed starting with POWER6 to use a bit in the RB operand to indicate large page invalidations, and to use other RB bits to indicate the base and actual page sizes and the segment size. 64k pages came in slightly earlier, with POWER5++. We use one bit in vcpu->arch.hflags to indicate that the emulated cpu supports 64k pages, and another to indicate that it has the new tlbie definition. The KVM_PPC_GET_SMMU_INFO ioctl presents a bit of a problem, because the MMU capabilities depend on which CPU model we're emulating, but it is a VM ioctl not a VCPU ioctl and therefore doesn't get passed a VCPU fd. In addition, commonly-used userspace (QEMU) calls it before setting the PVR for any VCPU. Therefore, as a best effort we look at the first vcpu in the VM and return 64k pages or not depending on its capabilities. We also make the PVR default to the host PVR on recent CPUs that support 1TB segments (and therefore multiple page sizes as well) so that KVM_PPC_GET_SMMU_INFO will include 64k page and 1TB segment support on those CPUs. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2013-09-20 12:52:44 +08:00
#ifdef CONFIG_PPC_BOOK3S_64
static inline u64 kvmppc_mmu_hash_vpte_64k(u64 vpage)
{
return hash_64((vpage & 0xffffffff0ULL) >> 4,
HPTEG_HASH_BITS_VPTE_64K);
}
#endif
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
void kvmppc_mmu_hpte_cache_map(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
{
u64 index;
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
KVM: PPC: Add tracepoint for generic mmu map This patch moves the generic mmu map debugging over to tracepoints. Signed-off-by: Alexander Graf <agraf@suse.de>
2010-08-02 18:51:07 +08:00
trace_kvm_book3s_mmu_map(pte);
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
spin_lock(&vcpu3s->mmu_lock);
KVM: PPC: RCU'ify the Book3s MMU So far we've been running all code without locking of any sort. This wasn't really an issue because I didn't see any parallel access to the shadow MMU code coming. But then I started to implement dirty bitmapping to MOL which has the video code in its own thread, so suddenly we had the dirty bitmap code run in parallel to the shadow mmu code. And with that came trouble. So I went ahead and made the MMU modifying functions as parallelizable as I could think of. I hope I didn't screw up too much RCU logic :-). If you know your way around RCU and locking and what needs to be done when, please take a look at this patch. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:17 +08:00
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
/* Add to ePTE list */
index = kvmppc_mmu_hash_pte(pte->pte.eaddr);
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
hlist_add_head_rcu(&pte->list_pte, &vcpu3s->hpte_hash_pte[index]);
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
KVM: PPC: Add book3s_32 tlbie flush acceleration On Book3s_32 the tlbie instruction flushed effective addresses by the mask 0x0ffff000. This is pretty hard to reflect with a hash that hashes ~0xfff, so to speed up that target we should also keep a special hash around for it. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:19 +08:00
/* Add to ePTE_long list */
index = kvmppc_mmu_hash_pte_long(pte->pte.eaddr);
hlist_add_head_rcu(&pte->list_pte_long,
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
&vcpu3s->hpte_hash_pte_long[index]);
KVM: PPC: Add book3s_32 tlbie flush acceleration On Book3s_32 the tlbie instruction flushed effective addresses by the mask 0x0ffff000. This is pretty hard to reflect with a hash that hashes ~0xfff, so to speed up that target we should also keep a special hash around for it. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:19 +08:00
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
/* Add to vPTE list */
index = kvmppc_mmu_hash_vpte(pte->pte.vpage);
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
hlist_add_head_rcu(&pte->list_vpte, &vcpu3s->hpte_hash_vpte[index]);
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
/* Add to vPTE_long list */
index = kvmppc_mmu_hash_vpte_long(pte->pte.vpage);
KVM: PPC: RCU'ify the Book3s MMU So far we've been running all code without locking of any sort. This wasn't really an issue because I didn't see any parallel access to the shadow MMU code coming. But then I started to implement dirty bitmapping to MOL which has the video code in its own thread, so suddenly we had the dirty bitmap code run in parallel to the shadow mmu code. And with that came trouble. So I went ahead and made the MMU modifying functions as parallelizable as I could think of. I hope I didn't screw up too much RCU logic :-). If you know your way around RCU and locking and what needs to be done when, please take a look at this patch. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:17 +08:00
hlist_add_head_rcu(&pte->list_vpte_long,
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
&vcpu3s->hpte_hash_vpte_long[index]);
KVM: PPC: RCU'ify the Book3s MMU So far we've been running all code without locking of any sort. This wasn't really an issue because I didn't see any parallel access to the shadow MMU code coming. But then I started to implement dirty bitmapping to MOL which has the video code in its own thread, so suddenly we had the dirty bitmap code run in parallel to the shadow mmu code. And with that came trouble. So I went ahead and made the MMU modifying functions as parallelizable as I could think of. I hope I didn't screw up too much RCU logic :-). If you know your way around RCU and locking and what needs to be done when, please take a look at this patch. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:17 +08:00
KVM: PPC: Book3S PR: Allow guest to use 64k pages This adds the code to interpret 64k HPTEs in the guest hashed page table (HPT), 64k SLB entries, and to tell the guest about 64k pages in kvm_vm_ioctl_get_smmu_info(). Guest 64k pages are still shadowed by 4k pages. This also adds another hash table to the four we have already in book3s_mmu_hpte.c to allow us to find all the PTEs that we have instantiated that match a given 64k guest page. The tlbie instruction changed starting with POWER6 to use a bit in the RB operand to indicate large page invalidations, and to use other RB bits to indicate the base and actual page sizes and the segment size. 64k pages came in slightly earlier, with POWER5++. We use one bit in vcpu->arch.hflags to indicate that the emulated cpu supports 64k pages, and another to indicate that it has the new tlbie definition. The KVM_PPC_GET_SMMU_INFO ioctl presents a bit of a problem, because the MMU capabilities depend on which CPU model we're emulating, but it is a VM ioctl not a VCPU ioctl and therefore doesn't get passed a VCPU fd. In addition, commonly-used userspace (QEMU) calls it before setting the PVR for any VCPU. Therefore, as a best effort we look at the first vcpu in the VM and return 64k pages or not depending on its capabilities. We also make the PVR default to the host PVR on recent CPUs that support 1TB segments (and therefore multiple page sizes as well) so that KVM_PPC_GET_SMMU_INFO will include 64k page and 1TB segment support on those CPUs. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2013-09-20 12:52:44 +08:00
#ifdef CONFIG_PPC_BOOK3S_64
/* Add to vPTE_64k list */
index = kvmppc_mmu_hash_vpte_64k(pte->pte.vpage);
hlist_add_head_rcu(&pte->list_vpte_64k,
&vcpu3s->hpte_hash_vpte_64k[index]);
#endif
KVM: PPC: Book3S PR: Use mmu_notifier_retry() in kvmppc_mmu_map_page() When the MM code is invalidating a range of pages, it calls the KVM kvm_mmu_notifier_invalidate_range_start() notifier function, which calls kvm_unmap_hva_range(), which arranges to flush all the existing host HPTEs for guest pages. However, the Linux PTEs for the range being flushed are still valid at that point. We are not supposed to establish any new references to pages in the range until the ...range_end() notifier gets called. The PPC-specific KVM code doesn't get any explicit notification of that; instead, we are supposed to use mmu_notifier_retry() to test whether we are or have been inside a range flush notifier pair while we have been getting a page and instantiating a host HPTE for the page. This therefore adds a call to mmu_notifier_retry inside kvmppc_mmu_map_page(). This call is inside a region locked with kvm->mmu_lock, which is the same lock that is called by the KVM MMU notifier functions, thus ensuring that no new notification can proceed while we are in the locked region. Inside this region we also create the host HPTE and link the corresponding hpte_cache structure into the lists used to find it later. We cannot allocate the hpte_cache structure inside this locked region because that can lead to deadlock, so we allocate it outside the region and free it if we end up not using it. This also moves the updates of vcpu3s->hpte_cache_count inside the regions locked with vcpu3s->mmu_lock, and does the increment in kvmppc_mmu_hpte_cache_map() when the pte is added to the cache rather than when it is allocated, in order that the hpte_cache_count is accurate. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2013-09-20 12:52:52 +08:00
vcpu3s->hpte_cache_count++;
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
spin_unlock(&vcpu3s->mmu_lock);
KVM: PPC: RCU'ify the Book3s MMU So far we've been running all code without locking of any sort. This wasn't really an issue because I didn't see any parallel access to the shadow MMU code coming. But then I started to implement dirty bitmapping to MOL which has the video code in its own thread, so suddenly we had the dirty bitmap code run in parallel to the shadow mmu code. And with that came trouble. So I went ahead and made the MMU modifying functions as parallelizable as I could think of. I hope I didn't screw up too much RCU logic :-). If you know your way around RCU and locking and what needs to be done when, please take a look at this patch. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:17 +08:00
}
static void free_pte_rcu(struct rcu_head *head)
{
struct hpte_cache *pte = container_of(head, struct hpte_cache, rcu_head);
kmem_cache_free(hpte_cache, pte);
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
}
static void invalidate_pte(struct kvm_vcpu *vcpu, struct hpte_cache *pte)
{
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
KVM: PPC: Move pte invalidate debug code to tracepoint This patch moves the SPTE flush debug printk over to tracepoints. Signed-off-by: Alexander Graf <agraf@suse.de>
2010-08-02 18:55:19 +08:00
trace_kvm_book3s_mmu_invalidate(pte);
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
/* Different for 32 and 64 bit */
kvmppc_mmu_invalidate_pte(vcpu, pte);
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
spin_lock(&vcpu3s->mmu_lock);
KVM: PPC: RCU'ify the Book3s MMU So far we've been running all code without locking of any sort. This wasn't really an issue because I didn't see any parallel access to the shadow MMU code coming. But then I started to implement dirty bitmapping to MOL which has the video code in its own thread, so suddenly we had the dirty bitmap code run in parallel to the shadow mmu code. And with that came trouble. So I went ahead and made the MMU modifying functions as parallelizable as I could think of. I hope I didn't screw up too much RCU logic :-). If you know your way around RCU and locking and what needs to be done when, please take a look at this patch. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:17 +08:00
KVM: PPC: Make invalidation code more reliable There is a race condition in the pte invalidation code path where we can't be sure if a pte was invalidated already. So let's move the spin lock around to get rid of the race. Signed-off-by: Alexander Graf <agraf@suse.de>
2010-08-03 03:24:48 +08:00
/* pte already invalidated in between? */
if (hlist_unhashed(&pte->list_pte)) {
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
spin_unlock(&vcpu3s->mmu_lock);
KVM: PPC: Make invalidation code more reliable There is a race condition in the pte invalidation code path where we can't be sure if a pte was invalidated already. So let's move the spin lock around to get rid of the race. Signed-off-by: Alexander Graf <agraf@suse.de>
2010-08-03 03:24:48 +08:00
return;
}
KVM: PPC: RCU'ify the Book3s MMU So far we've been running all code without locking of any sort. This wasn't really an issue because I didn't see any parallel access to the shadow MMU code coming. But then I started to implement dirty bitmapping to MOL which has the video code in its own thread, so suddenly we had the dirty bitmap code run in parallel to the shadow mmu code. And with that came trouble. So I went ahead and made the MMU modifying functions as parallelizable as I could think of. I hope I didn't screw up too much RCU logic :-). If you know your way around RCU and locking and what needs to be done when, please take a look at this patch. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:17 +08:00
hlist_del_init_rcu(&pte->list_pte);
KVM: PPC: Add book3s_32 tlbie flush acceleration On Book3s_32 the tlbie instruction flushed effective addresses by the mask 0x0ffff000. This is pretty hard to reflect with a hash that hashes ~0xfff, so to speed up that target we should also keep a special hash around for it. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:19 +08:00
hlist_del_init_rcu(&pte->list_pte_long);
KVM: PPC: RCU'ify the Book3s MMU So far we've been running all code without locking of any sort. This wasn't really an issue because I didn't see any parallel access to the shadow MMU code coming. But then I started to implement dirty bitmapping to MOL which has the video code in its own thread, so suddenly we had the dirty bitmap code run in parallel to the shadow mmu code. And with that came trouble. So I went ahead and made the MMU modifying functions as parallelizable as I could think of. I hope I didn't screw up too much RCU logic :-). If you know your way around RCU and locking and what needs to be done when, please take a look at this patch. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:17 +08:00
hlist_del_init_rcu(&pte->list_vpte);
hlist_del_init_rcu(&pte->list_vpte_long);
KVM: PPC: Book3S PR: Allow guest to use 64k pages This adds the code to interpret 64k HPTEs in the guest hashed page table (HPT), 64k SLB entries, and to tell the guest about 64k pages in kvm_vm_ioctl_get_smmu_info(). Guest 64k pages are still shadowed by 4k pages. This also adds another hash table to the four we have already in book3s_mmu_hpte.c to allow us to find all the PTEs that we have instantiated that match a given 64k guest page. The tlbie instruction changed starting with POWER6 to use a bit in the RB operand to indicate large page invalidations, and to use other RB bits to indicate the base and actual page sizes and the segment size. 64k pages came in slightly earlier, with POWER5++. We use one bit in vcpu->arch.hflags to indicate that the emulated cpu supports 64k pages, and another to indicate that it has the new tlbie definition. The KVM_PPC_GET_SMMU_INFO ioctl presents a bit of a problem, because the MMU capabilities depend on which CPU model we're emulating, but it is a VM ioctl not a VCPU ioctl and therefore doesn't get passed a VCPU fd. In addition, commonly-used userspace (QEMU) calls it before setting the PVR for any VCPU. Therefore, as a best effort we look at the first vcpu in the VM and return 64k pages or not depending on its capabilities. We also make the PVR default to the host PVR on recent CPUs that support 1TB segments (and therefore multiple page sizes as well) so that KVM_PPC_GET_SMMU_INFO will include 64k page and 1TB segment support on those CPUs. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2013-09-20 12:52:44 +08:00
#ifdef CONFIG_PPC_BOOK3S_64
hlist_del_init_rcu(&pte->list_vpte_64k);
#endif
KVM: PPC: Book3S PR: Use mmu_notifier_retry() in kvmppc_mmu_map_page() When the MM code is invalidating a range of pages, it calls the KVM kvm_mmu_notifier_invalidate_range_start() notifier function, which calls kvm_unmap_hva_range(), which arranges to flush all the existing host HPTEs for guest pages. However, the Linux PTEs for the range being flushed are still valid at that point. We are not supposed to establish any new references to pages in the range until the ...range_end() notifier gets called. The PPC-specific KVM code doesn't get any explicit notification of that; instead, we are supposed to use mmu_notifier_retry() to test whether we are or have been inside a range flush notifier pair while we have been getting a page and instantiating a host HPTE for the page. This therefore adds a call to mmu_notifier_retry inside kvmppc_mmu_map_page(). This call is inside a region locked with kvm->mmu_lock, which is the same lock that is called by the KVM MMU notifier functions, thus ensuring that no new notification can proceed while we are in the locked region. Inside this region we also create the host HPTE and link the corresponding hpte_cache structure into the lists used to find it later. We cannot allocate the hpte_cache structure inside this locked region because that can lead to deadlock, so we allocate it outside the region and free it if we end up not using it. This also moves the updates of vcpu3s->hpte_cache_count inside the regions locked with vcpu3s->mmu_lock, and does the increment in kvmppc_mmu_hpte_cache_map() when the pte is added to the cache rather than when it is allocated, in order that the hpte_cache_count is accurate. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2013-09-20 12:52:52 +08:00
vcpu3s->hpte_cache_count--;
KVM: PPC: RCU'ify the Book3s MMU So far we've been running all code without locking of any sort. This wasn't really an issue because I didn't see any parallel access to the shadow MMU code coming. But then I started to implement dirty bitmapping to MOL which has the video code in its own thread, so suddenly we had the dirty bitmap code run in parallel to the shadow mmu code. And with that came trouble. So I went ahead and made the MMU modifying functions as parallelizable as I could think of. I hope I didn't screw up too much RCU logic :-). If you know your way around RCU and locking and what needs to be done when, please take a look at this patch. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:17 +08:00
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
spin_unlock(&vcpu3s->mmu_lock);
KVM: PPC: Make invalidation code more reliable There is a race condition in the pte invalidation code path where we can't be sure if a pte was invalidated already. So let's move the spin lock around to get rid of the race. Signed-off-by: Alexander Graf <agraf@suse.de>
2010-08-03 03:24:48 +08:00
KVM: PPC: RCU'ify the Book3s MMU So far we've been running all code without locking of any sort. This wasn't really an issue because I didn't see any parallel access to the shadow MMU code coming. But then I started to implement dirty bitmapping to MOL which has the video code in its own thread, so suddenly we had the dirty bitmap code run in parallel to the shadow mmu code. And with that came trouble. So I went ahead and made the MMU modifying functions as parallelizable as I could think of. I hope I didn't screw up too much RCU logic :-). If you know your way around RCU and locking and what needs to be done when, please take a look at this patch. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:17 +08:00
call_rcu(&pte->rcu_head, free_pte_rcu);
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
}
static void kvmppc_mmu_pte_flush_all(struct kvm_vcpu *vcpu)
{
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
struct hpte_cache *pte;
int i;
KVM: PPC: RCU'ify the Book3s MMU So far we've been running all code without locking of any sort. This wasn't really an issue because I didn't see any parallel access to the shadow MMU code coming. But then I started to implement dirty bitmapping to MOL which has the video code in its own thread, so suddenly we had the dirty bitmap code run in parallel to the shadow mmu code. And with that came trouble. So I went ahead and made the MMU modifying functions as parallelizable as I could think of. I hope I didn't screw up too much RCU logic :-). If you know your way around RCU and locking and what needs to be done when, please take a look at this patch. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:17 +08:00
rcu_read_lock();
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
for (i = 0; i < HPTEG_HASH_NUM_VPTE_LONG; i++) {
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
struct hlist_head *list = &vcpu3s->hpte_hash_vpte_long[i];
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
hlist: drop the node parameter from iterators I'm not sure why, but the hlist for each entry iterators were conceived list_for_each_entry(pos, head, member) The hlist ones were greedy and wanted an extra parameter: hlist_for_each_entry(tpos, pos, head, member) Why did they need an extra pos parameter? I'm not quite sure. Not only they don't really need it, it also prevents the iterator from looking exactly like the list iterator, which is unfortunate. Besides the semantic patch, there was some manual work required: - Fix up the actual hlist iterators in linux/list.h - Fix up the declaration of other iterators based on the hlist ones. - A very small amount of places were using the 'node' parameter, this was modified to use 'obj->member' instead. - Coccinelle didn't handle the hlist_for_each_entry_safe iterator properly, so those had to be fixed up manually. The semantic patch which is mostly the work of Peter Senna Tschudin is here: @@ iterator name hlist_for_each_entry, hlist_for_each_entry_continue, hlist_for_each_entry_from, hlist_for_each_entry_rcu, hlist_for_each_entry_rcu_bh, hlist_for_each_entry_continue_rcu_bh, for_each_busy_worker, ax25_uid_for_each, ax25_for_each, inet_bind_bucket_for_each, sctp_for_each_hentry, sk_for_each, sk_for_each_rcu, sk_for_each_from, sk_for_each_safe, sk_for_each_bound, hlist_for_each_entry_safe, hlist_for_each_entry_continue_rcu, nr_neigh_for_each, nr_neigh_for_each_safe, nr_node_for_each, nr_node_for_each_safe, for_each_gfn_indirect_valid_sp, for_each_gfn_sp, for_each_host; type T; expression a,c,d,e; identifier b; statement S; @@ -T b; <+... when != b ( hlist_for_each_entry(a, - b, c, d) S | hlist_for_each_entry_continue(a, - b, c) S | hlist_for_each_entry_from(a, - b, c) S | hlist_for_each_entry_rcu(a, - b, c, d) S | hlist_for_each_entry_rcu_bh(a, - b, c, d) S | hlist_for_each_entry_continue_rcu_bh(a, - b, c) S | for_each_busy_worker(a, c, - b, d) S | ax25_uid_for_each(a, - b, c) S | ax25_for_each(a, - b, c) S | inet_bind_bucket_for_each(a, - b, c) S | sctp_for_each_hentry(a, - b, c) S | sk_for_each(a, - b, c) S | sk_for_each_rcu(a, - b, c) S | sk_for_each_from -(a, b) +(a) S + sk_for_each_from(a) S | sk_for_each_safe(a, - b, c, d) S | sk_for_each_bound(a, - b, c) S | hlist_for_each_entry_safe(a, - b, c, d, e) S | hlist_for_each_entry_continue_rcu(a, - b, c) S | nr_neigh_for_each(a, - b, c) S | nr_neigh_for_each_safe(a, - b, c, d) S | nr_node_for_each(a, - b, c) S | nr_node_for_each_safe(a, - b, c, d) S | - for_each_gfn_sp(a, c, d, b) S + for_each_gfn_sp(a, c, d) S | - for_each_gfn_indirect_valid_sp(a, c, d, b) S + for_each_gfn_indirect_valid_sp(a, c, d) S | for_each_host(a, - b, c) S | for_each_host_safe(a, - b, c, d) S | for_each_mesh_entry(a, - b, c, d) S ) ...+> [akpm@linux-foundation.org: drop bogus change from net/ipv4/raw.c] [akpm@linux-foundation.org: drop bogus hunk from net/ipv6/raw.c] [akpm@linux-foundation.org: checkpatch fixes] [akpm@linux-foundation.org: fix warnings] [akpm@linux-foudnation.org: redo intrusive kvm changes] Tested-by: Peter Senna Tschudin <peter.senna@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Sasha Levin <sasha.levin@oracle.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Gleb Natapov <gleb@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-28 09:06:00 +08:00
hlist_for_each_entry_rcu(pte, list, list_vpte_long)
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
invalidate_pte(vcpu, pte);
}
KVM: PPC: RCU'ify the Book3s MMU So far we've been running all code without locking of any sort. This wasn't really an issue because I didn't see any parallel access to the shadow MMU code coming. But then I started to implement dirty bitmapping to MOL which has the video code in its own thread, so suddenly we had the dirty bitmap code run in parallel to the shadow mmu code. And with that came trouble. So I went ahead and made the MMU modifying functions as parallelizable as I could think of. I hope I didn't screw up too much RCU logic :-). If you know your way around RCU and locking and what needs to be done when, please take a look at this patch. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:17 +08:00
rcu_read_unlock();
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
}
static void kvmppc_mmu_pte_flush_page(struct kvm_vcpu *vcpu, ulong guest_ea)
{
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
struct hlist_head *list;
struct hpte_cache *pte;
/* Find the list of entries in the map */
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
list = &vcpu3s->hpte_hash_pte[kvmppc_mmu_hash_pte(guest_ea)];
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
KVM: PPC: RCU'ify the Book3s MMU So far we've been running all code without locking of any sort. This wasn't really an issue because I didn't see any parallel access to the shadow MMU code coming. But then I started to implement dirty bitmapping to MOL which has the video code in its own thread, so suddenly we had the dirty bitmap code run in parallel to the shadow mmu code. And with that came trouble. So I went ahead and made the MMU modifying functions as parallelizable as I could think of. I hope I didn't screw up too much RCU logic :-). If you know your way around RCU and locking and what needs to be done when, please take a look at this patch. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:17 +08:00
rcu_read_lock();
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
/* Check the list for matching entries and invalidate */
hlist: drop the node parameter from iterators I'm not sure why, but the hlist for each entry iterators were conceived list_for_each_entry(pos, head, member) The hlist ones were greedy and wanted an extra parameter: hlist_for_each_entry(tpos, pos, head, member) Why did they need an extra pos parameter? I'm not quite sure. Not only they don't really need it, it also prevents the iterator from looking exactly like the list iterator, which is unfortunate. Besides the semantic patch, there was some manual work required: - Fix up the actual hlist iterators in linux/list.h - Fix up the declaration of other iterators based on the hlist ones. - A very small amount of places were using the 'node' parameter, this was modified to use 'obj->member' instead. - Coccinelle didn't handle the hlist_for_each_entry_safe iterator properly, so those had to be fixed up manually. The semantic patch which is mostly the work of Peter Senna Tschudin is here: @@ iterator name hlist_for_each_entry, hlist_for_each_entry_continue, hlist_for_each_entry_from, hlist_for_each_entry_rcu, hlist_for_each_entry_rcu_bh, hlist_for_each_entry_continue_rcu_bh, for_each_busy_worker, ax25_uid_for_each, ax25_for_each, inet_bind_bucket_for_each, sctp_for_each_hentry, sk_for_each, sk_for_each_rcu, sk_for_each_from, sk_for_each_safe, sk_for_each_bound, hlist_for_each_entry_safe, hlist_for_each_entry_continue_rcu, nr_neigh_for_each, nr_neigh_for_each_safe, nr_node_for_each, nr_node_for_each_safe, for_each_gfn_indirect_valid_sp, for_each_gfn_sp, for_each_host; type T; expression a,c,d,e; identifier b; statement S; @@ -T b; <+... when != b ( hlist_for_each_entry(a, - b, c, d) S | hlist_for_each_entry_continue(a, - b, c) S | hlist_for_each_entry_from(a, - b, c) S | hlist_for_each_entry_rcu(a, - b, c, d) S | hlist_for_each_entry_rcu_bh(a, - b, c, d) S | hlist_for_each_entry_continue_rcu_bh(a, - b, c) S | for_each_busy_worker(a, c, - b, d) S | ax25_uid_for_each(a, - b, c) S | ax25_for_each(a, - b, c) S | inet_bind_bucket_for_each(a, - b, c) S | sctp_for_each_hentry(a, - b, c) S | sk_for_each(a, - b, c) S | sk_for_each_rcu(a, - b, c) S | sk_for_each_from -(a, b) +(a) S + sk_for_each_from(a) S | sk_for_each_safe(a, - b, c, d) S | sk_for_each_bound(a, - b, c) S | hlist_for_each_entry_safe(a, - b, c, d, e) S | hlist_for_each_entry_continue_rcu(a, - b, c) S | nr_neigh_for_each(a, - b, c) S | nr_neigh_for_each_safe(a, - b, c, d) S | nr_node_for_each(a, - b, c) S | nr_node_for_each_safe(a, - b, c, d) S | - for_each_gfn_sp(a, c, d, b) S + for_each_gfn_sp(a, c, d) S | - for_each_gfn_indirect_valid_sp(a, c, d, b) S + for_each_gfn_indirect_valid_sp(a, c, d) S | for_each_host(a, - b, c) S | for_each_host_safe(a, - b, c, d) S | for_each_mesh_entry(a, - b, c, d) S ) ...+> [akpm@linux-foundation.org: drop bogus change from net/ipv4/raw.c] [akpm@linux-foundation.org: drop bogus hunk from net/ipv6/raw.c] [akpm@linux-foundation.org: checkpatch fixes] [akpm@linux-foundation.org: fix warnings] [akpm@linux-foudnation.org: redo intrusive kvm changes] Tested-by: Peter Senna Tschudin <peter.senna@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Sasha Levin <sasha.levin@oracle.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Gleb Natapov <gleb@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-28 09:06:00 +08:00
hlist_for_each_entry_rcu(pte, list, list_pte)
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
if ((pte->pte.eaddr & ~0xfffUL) == guest_ea)
invalidate_pte(vcpu, pte);
KVM: PPC: RCU'ify the Book3s MMU So far we've been running all code without locking of any sort. This wasn't really an issue because I didn't see any parallel access to the shadow MMU code coming. But then I started to implement dirty bitmapping to MOL which has the video code in its own thread, so suddenly we had the dirty bitmap code run in parallel to the shadow mmu code. And with that came trouble. So I went ahead and made the MMU modifying functions as parallelizable as I could think of. I hope I didn't screw up too much RCU logic :-). If you know your way around RCU and locking and what needs to be done when, please take a look at this patch. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:17 +08:00
rcu_read_unlock();
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
}
KVM: PPC: Add book3s_32 tlbie flush acceleration On Book3s_32 the tlbie instruction flushed effective addresses by the mask 0x0ffff000. This is pretty hard to reflect with a hash that hashes ~0xfff, so to speed up that target we should also keep a special hash around for it. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:19 +08:00
static void kvmppc_mmu_pte_flush_long(struct kvm_vcpu *vcpu, ulong guest_ea)
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
{
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
KVM: PPC: Add book3s_32 tlbie flush acceleration On Book3s_32 the tlbie instruction flushed effective addresses by the mask 0x0ffff000. This is pretty hard to reflect with a hash that hashes ~0xfff, so to speed up that target we should also keep a special hash around for it. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:19 +08:00
struct hlist_head *list;
struct hpte_cache *pte;
/* Find the list of entries in the map */
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
list = &vcpu3s->hpte_hash_pte_long[
KVM: PPC: Add book3s_32 tlbie flush acceleration On Book3s_32 the tlbie instruction flushed effective addresses by the mask 0x0ffff000. This is pretty hard to reflect with a hash that hashes ~0xfff, so to speed up that target we should also keep a special hash around for it. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:19 +08:00
kvmppc_mmu_hash_pte_long(guest_ea)];
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
KVM: PPC: Add book3s_32 tlbie flush acceleration On Book3s_32 the tlbie instruction flushed effective addresses by the mask 0x0ffff000. This is pretty hard to reflect with a hash that hashes ~0xfff, so to speed up that target we should also keep a special hash around for it. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:19 +08:00
rcu_read_lock();
/* Check the list for matching entries and invalidate */
hlist: drop the node parameter from iterators I'm not sure why, but the hlist for each entry iterators were conceived list_for_each_entry(pos, head, member) The hlist ones were greedy and wanted an extra parameter: hlist_for_each_entry(tpos, pos, head, member) Why did they need an extra pos parameter? I'm not quite sure. Not only they don't really need it, it also prevents the iterator from looking exactly like the list iterator, which is unfortunate. Besides the semantic patch, there was some manual work required: - Fix up the actual hlist iterators in linux/list.h - Fix up the declaration of other iterators based on the hlist ones. - A very small amount of places were using the 'node' parameter, this was modified to use 'obj->member' instead. - Coccinelle didn't handle the hlist_for_each_entry_safe iterator properly, so those had to be fixed up manually. The semantic patch which is mostly the work of Peter Senna Tschudin is here: @@ iterator name hlist_for_each_entry, hlist_for_each_entry_continue, hlist_for_each_entry_from, hlist_for_each_entry_rcu, hlist_for_each_entry_rcu_bh, hlist_for_each_entry_continue_rcu_bh, for_each_busy_worker, ax25_uid_for_each, ax25_for_each, inet_bind_bucket_for_each, sctp_for_each_hentry, sk_for_each, sk_for_each_rcu, sk_for_each_from, sk_for_each_safe, sk_for_each_bound, hlist_for_each_entry_safe, hlist_for_each_entry_continue_rcu, nr_neigh_for_each, nr_neigh_for_each_safe, nr_node_for_each, nr_node_for_each_safe, for_each_gfn_indirect_valid_sp, for_each_gfn_sp, for_each_host; type T; expression a,c,d,e; identifier b; statement S; @@ -T b; <+... when != b ( hlist_for_each_entry(a, - b, c, d) S | hlist_for_each_entry_continue(a, - b, c) S | hlist_for_each_entry_from(a, - b, c) S | hlist_for_each_entry_rcu(a, - b, c, d) S | hlist_for_each_entry_rcu_bh(a, - b, c, d) S | hlist_for_each_entry_continue_rcu_bh(a, - b, c) S | for_each_busy_worker(a, c, - b, d) S | ax25_uid_for_each(a, - b, c) S | ax25_for_each(a, - b, c) S | inet_bind_bucket_for_each(a, - b, c) S | sctp_for_each_hentry(a, - b, c) S | sk_for_each(a, - b, c) S | sk_for_each_rcu(a, - b, c) S | sk_for_each_from -(a, b) +(a) S + sk_for_each_from(a) S | sk_for_each_safe(a, - b, c, d) S | sk_for_each_bound(a, - b, c) S | hlist_for_each_entry_safe(a, - b, c, d, e) S | hlist_for_each_entry_continue_rcu(a, - b, c) S | nr_neigh_for_each(a, - b, c) S | nr_neigh_for_each_safe(a, - b, c, d) S | nr_node_for_each(a, - b, c) S | nr_node_for_each_safe(a, - b, c, d) S | - for_each_gfn_sp(a, c, d, b) S + for_each_gfn_sp(a, c, d) S | - for_each_gfn_indirect_valid_sp(a, c, d, b) S + for_each_gfn_indirect_valid_sp(a, c, d) S | for_each_host(a, - b, c) S | for_each_host_safe(a, - b, c, d) S | for_each_mesh_entry(a, - b, c, d) S ) ...+> [akpm@linux-foundation.org: drop bogus change from net/ipv4/raw.c] [akpm@linux-foundation.org: drop bogus hunk from net/ipv6/raw.c] [akpm@linux-foundation.org: checkpatch fixes] [akpm@linux-foundation.org: fix warnings] [akpm@linux-foudnation.org: redo intrusive kvm changes] Tested-by: Peter Senna Tschudin <peter.senna@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Sasha Levin <sasha.levin@oracle.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Gleb Natapov <gleb@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-28 09:06:00 +08:00
hlist_for_each_entry_rcu(pte, list, list_pte_long)
KVM: PPC: Add book3s_32 tlbie flush acceleration On Book3s_32 the tlbie instruction flushed effective addresses by the mask 0x0ffff000. This is pretty hard to reflect with a hash that hashes ~0xfff, so to speed up that target we should also keep a special hash around for it. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:19 +08:00
if ((pte->pte.eaddr & 0x0ffff000UL) == guest_ea)
invalidate_pte(vcpu, pte);
rcu_read_unlock();
}
void kvmppc_mmu_pte_flush(struct kvm_vcpu *vcpu, ulong guest_ea, ulong ea_mask)
{
KVM: PPC: Add tracepoints for generic spte flushes The different ways of flusing shadow ptes have their own debug prints which use stupid old printk. Let's move them to tracepoints, making them easier available, faster and possible to activate on demand Signed-off-by: Alexander Graf <agraf@suse.de>
2010-08-02 19:40:30 +08:00
trace_kvm_book3s_mmu_flush("", vcpu, guest_ea, ea_mask);
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
guest_ea &= ea_mask;
switch (ea_mask) {
case ~0xfffUL:
kvmppc_mmu_pte_flush_page(vcpu, guest_ea);
break;
case 0x0ffff000:
KVM: PPC: Add book3s_32 tlbie flush acceleration On Book3s_32 the tlbie instruction flushed effective addresses by the mask 0x0ffff000. This is pretty hard to reflect with a hash that hashes ~0xfff, so to speed up that target we should also keep a special hash around for it. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:19 +08:00
kvmppc_mmu_pte_flush_long(vcpu, guest_ea);
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
break;
case 0:
/* Doing a complete flush -> start from scratch */
kvmppc_mmu_pte_flush_all(vcpu);
break;
default:
WARN_ON(1);
break;
}
}
/* Flush with mask 0xfffffffff */
static void kvmppc_mmu_pte_vflush_short(struct kvm_vcpu *vcpu, u64 guest_vp)
{
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
struct hlist_head *list;
struct hpte_cache *pte;
u64 vp_mask = 0xfffffffffULL;
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
list = &vcpu3s->hpte_hash_vpte[kvmppc_mmu_hash_vpte(guest_vp)];
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
KVM: PPC: RCU'ify the Book3s MMU So far we've been running all code without locking of any sort. This wasn't really an issue because I didn't see any parallel access to the shadow MMU code coming. But then I started to implement dirty bitmapping to MOL which has the video code in its own thread, so suddenly we had the dirty bitmap code run in parallel to the shadow mmu code. And with that came trouble. So I went ahead and made the MMU modifying functions as parallelizable as I could think of. I hope I didn't screw up too much RCU logic :-). If you know your way around RCU and locking and what needs to be done when, please take a look at this patch. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:17 +08:00
rcu_read_lock();
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
/* Check the list for matching entries and invalidate */
hlist: drop the node parameter from iterators I'm not sure why, but the hlist for each entry iterators were conceived list_for_each_entry(pos, head, member) The hlist ones were greedy and wanted an extra parameter: hlist_for_each_entry(tpos, pos, head, member) Why did they need an extra pos parameter? I'm not quite sure. Not only they don't really need it, it also prevents the iterator from looking exactly like the list iterator, which is unfortunate. Besides the semantic patch, there was some manual work required: - Fix up the actual hlist iterators in linux/list.h - Fix up the declaration of other iterators based on the hlist ones. - A very small amount of places were using the 'node' parameter, this was modified to use 'obj->member' instead. - Coccinelle didn't handle the hlist_for_each_entry_safe iterator properly, so those had to be fixed up manually. The semantic patch which is mostly the work of Peter Senna Tschudin is here: @@ iterator name hlist_for_each_entry, hlist_for_each_entry_continue, hlist_for_each_entry_from, hlist_for_each_entry_rcu, hlist_for_each_entry_rcu_bh, hlist_for_each_entry_continue_rcu_bh, for_each_busy_worker, ax25_uid_for_each, ax25_for_each, inet_bind_bucket_for_each, sctp_for_each_hentry, sk_for_each, sk_for_each_rcu, sk_for_each_from, sk_for_each_safe, sk_for_each_bound, hlist_for_each_entry_safe, hlist_for_each_entry_continue_rcu, nr_neigh_for_each, nr_neigh_for_each_safe, nr_node_for_each, nr_node_for_each_safe, for_each_gfn_indirect_valid_sp, for_each_gfn_sp, for_each_host; type T; expression a,c,d,e; identifier b; statement S; @@ -T b; <+... when != b ( hlist_for_each_entry(a, - b, c, d) S | hlist_for_each_entry_continue(a, - b, c) S | hlist_for_each_entry_from(a, - b, c) S | hlist_for_each_entry_rcu(a, - b, c, d) S | hlist_for_each_entry_rcu_bh(a, - b, c, d) S | hlist_for_each_entry_continue_rcu_bh(a, - b, c) S | for_each_busy_worker(a, c, - b, d) S | ax25_uid_for_each(a, - b, c) S | ax25_for_each(a, - b, c) S | inet_bind_bucket_for_each(a, - b, c) S | sctp_for_each_hentry(a, - b, c) S | sk_for_each(a, - b, c) S | sk_for_each_rcu(a, - b, c) S | sk_for_each_from -(a, b) +(a) S + sk_for_each_from(a) S | sk_for_each_safe(a, - b, c, d) S | sk_for_each_bound(a, - b, c) S | hlist_for_each_entry_safe(a, - b, c, d, e) S | hlist_for_each_entry_continue_rcu(a, - b, c) S | nr_neigh_for_each(a, - b, c) S | nr_neigh_for_each_safe(a, - b, c, d) S | nr_node_for_each(a, - b, c) S | nr_node_for_each_safe(a, - b, c, d) S | - for_each_gfn_sp(a, c, d, b) S + for_each_gfn_sp(a, c, d) S | - for_each_gfn_indirect_valid_sp(a, c, d, b) S + for_each_gfn_indirect_valid_sp(a, c, d) S | for_each_host(a, - b, c) S | for_each_host_safe(a, - b, c, d) S | for_each_mesh_entry(a, - b, c, d) S ) ...+> [akpm@linux-foundation.org: drop bogus change from net/ipv4/raw.c] [akpm@linux-foundation.org: drop bogus hunk from net/ipv6/raw.c] [akpm@linux-foundation.org: checkpatch fixes] [akpm@linux-foundation.org: fix warnings] [akpm@linux-foudnation.org: redo intrusive kvm changes] Tested-by: Peter Senna Tschudin <peter.senna@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Sasha Levin <sasha.levin@oracle.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Gleb Natapov <gleb@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-28 09:06:00 +08:00
hlist_for_each_entry_rcu(pte, list, list_vpte)
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
if ((pte->pte.vpage & vp_mask) == guest_vp)
invalidate_pte(vcpu, pte);
KVM: PPC: RCU'ify the Book3s MMU So far we've been running all code without locking of any sort. This wasn't really an issue because I didn't see any parallel access to the shadow MMU code coming. But then I started to implement dirty bitmapping to MOL which has the video code in its own thread, so suddenly we had the dirty bitmap code run in parallel to the shadow mmu code. And with that came trouble. So I went ahead and made the MMU modifying functions as parallelizable as I could think of. I hope I didn't screw up too much RCU logic :-). If you know your way around RCU and locking and what needs to be done when, please take a look at this patch. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:17 +08:00
rcu_read_unlock();
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
}
KVM: PPC: Book3S PR: Allow guest to use 64k pages This adds the code to interpret 64k HPTEs in the guest hashed page table (HPT), 64k SLB entries, and to tell the guest about 64k pages in kvm_vm_ioctl_get_smmu_info(). Guest 64k pages are still shadowed by 4k pages. This also adds another hash table to the four we have already in book3s_mmu_hpte.c to allow us to find all the PTEs that we have instantiated that match a given 64k guest page. The tlbie instruction changed starting with POWER6 to use a bit in the RB operand to indicate large page invalidations, and to use other RB bits to indicate the base and actual page sizes and the segment size. 64k pages came in slightly earlier, with POWER5++. We use one bit in vcpu->arch.hflags to indicate that the emulated cpu supports 64k pages, and another to indicate that it has the new tlbie definition. The KVM_PPC_GET_SMMU_INFO ioctl presents a bit of a problem, because the MMU capabilities depend on which CPU model we're emulating, but it is a VM ioctl not a VCPU ioctl and therefore doesn't get passed a VCPU fd. In addition, commonly-used userspace (QEMU) calls it before setting the PVR for any VCPU. Therefore, as a best effort we look at the first vcpu in the VM and return 64k pages or not depending on its capabilities. We also make the PVR default to the host PVR on recent CPUs that support 1TB segments (and therefore multiple page sizes as well) so that KVM_PPC_GET_SMMU_INFO will include 64k page and 1TB segment support on those CPUs. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2013-09-20 12:52:44 +08:00
#ifdef CONFIG_PPC_BOOK3S_64
/* Flush with mask 0xffffffff0 */
static void kvmppc_mmu_pte_vflush_64k(struct kvm_vcpu *vcpu, u64 guest_vp)
{
struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
struct hlist_head *list;
struct hpte_cache *pte;
u64 vp_mask = 0xffffffff0ULL;
list = &vcpu3s->hpte_hash_vpte_64k[
kvmppc_mmu_hash_vpte_64k(guest_vp)];
rcu_read_lock();
/* Check the list for matching entries and invalidate */
hlist_for_each_entry_rcu(pte, list, list_vpte_64k)
if ((pte->pte.vpage & vp_mask) == guest_vp)
invalidate_pte(vcpu, pte);
rcu_read_unlock();
}
#endif
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
/* Flush with mask 0xffffff000 */
static void kvmppc_mmu_pte_vflush_long(struct kvm_vcpu *vcpu, u64 guest_vp)
{
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
struct hlist_head *list;
struct hpte_cache *pte;
u64 vp_mask = 0xffffff000ULL;
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
list = &vcpu3s->hpte_hash_vpte_long[
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
kvmppc_mmu_hash_vpte_long(guest_vp)];
KVM: PPC: RCU'ify the Book3s MMU So far we've been running all code without locking of any sort. This wasn't really an issue because I didn't see any parallel access to the shadow MMU code coming. But then I started to implement dirty bitmapping to MOL which has the video code in its own thread, so suddenly we had the dirty bitmap code run in parallel to the shadow mmu code. And with that came trouble. So I went ahead and made the MMU modifying functions as parallelizable as I could think of. I hope I didn't screw up too much RCU logic :-). If you know your way around RCU and locking and what needs to be done when, please take a look at this patch. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:17 +08:00
rcu_read_lock();
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
/* Check the list for matching entries and invalidate */
hlist: drop the node parameter from iterators I'm not sure why, but the hlist for each entry iterators were conceived list_for_each_entry(pos, head, member) The hlist ones were greedy and wanted an extra parameter: hlist_for_each_entry(tpos, pos, head, member) Why did they need an extra pos parameter? I'm not quite sure. Not only they don't really need it, it also prevents the iterator from looking exactly like the list iterator, which is unfortunate. Besides the semantic patch, there was some manual work required: - Fix up the actual hlist iterators in linux/list.h - Fix up the declaration of other iterators based on the hlist ones. - A very small amount of places were using the 'node' parameter, this was modified to use 'obj->member' instead. - Coccinelle didn't handle the hlist_for_each_entry_safe iterator properly, so those had to be fixed up manually. The semantic patch which is mostly the work of Peter Senna Tschudin is here: @@ iterator name hlist_for_each_entry, hlist_for_each_entry_continue, hlist_for_each_entry_from, hlist_for_each_entry_rcu, hlist_for_each_entry_rcu_bh, hlist_for_each_entry_continue_rcu_bh, for_each_busy_worker, ax25_uid_for_each, ax25_for_each, inet_bind_bucket_for_each, sctp_for_each_hentry, sk_for_each, sk_for_each_rcu, sk_for_each_from, sk_for_each_safe, sk_for_each_bound, hlist_for_each_entry_safe, hlist_for_each_entry_continue_rcu, nr_neigh_for_each, nr_neigh_for_each_safe, nr_node_for_each, nr_node_for_each_safe, for_each_gfn_indirect_valid_sp, for_each_gfn_sp, for_each_host; type T; expression a,c,d,e; identifier b; statement S; @@ -T b; <+... when != b ( hlist_for_each_entry(a, - b, c, d) S | hlist_for_each_entry_continue(a, - b, c) S | hlist_for_each_entry_from(a, - b, c) S | hlist_for_each_entry_rcu(a, - b, c, d) S | hlist_for_each_entry_rcu_bh(a, - b, c, d) S | hlist_for_each_entry_continue_rcu_bh(a, - b, c) S | for_each_busy_worker(a, c, - b, d) S | ax25_uid_for_each(a, - b, c) S | ax25_for_each(a, - b, c) S | inet_bind_bucket_for_each(a, - b, c) S | sctp_for_each_hentry(a, - b, c) S | sk_for_each(a, - b, c) S | sk_for_each_rcu(a, - b, c) S | sk_for_each_from -(a, b) +(a) S + sk_for_each_from(a) S | sk_for_each_safe(a, - b, c, d) S | sk_for_each_bound(a, - b, c) S | hlist_for_each_entry_safe(a, - b, c, d, e) S | hlist_for_each_entry_continue_rcu(a, - b, c) S | nr_neigh_for_each(a, - b, c) S | nr_neigh_for_each_safe(a, - b, c, d) S | nr_node_for_each(a, - b, c) S | nr_node_for_each_safe(a, - b, c, d) S | - for_each_gfn_sp(a, c, d, b) S + for_each_gfn_sp(a, c, d) S | - for_each_gfn_indirect_valid_sp(a, c, d, b) S + for_each_gfn_indirect_valid_sp(a, c, d) S | for_each_host(a, - b, c) S | for_each_host_safe(a, - b, c, d) S | for_each_mesh_entry(a, - b, c, d) S ) ...+> [akpm@linux-foundation.org: drop bogus change from net/ipv4/raw.c] [akpm@linux-foundation.org: drop bogus hunk from net/ipv6/raw.c] [akpm@linux-foundation.org: checkpatch fixes] [akpm@linux-foundation.org: fix warnings] [akpm@linux-foudnation.org: redo intrusive kvm changes] Tested-by: Peter Senna Tschudin <peter.senna@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Sasha Levin <sasha.levin@oracle.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Gleb Natapov <gleb@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-28 09:06:00 +08:00
hlist_for_each_entry_rcu(pte, list, list_vpte_long)
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
if ((pte->pte.vpage & vp_mask) == guest_vp)
invalidate_pte(vcpu, pte);
KVM: PPC: RCU'ify the Book3s MMU So far we've been running all code without locking of any sort. This wasn't really an issue because I didn't see any parallel access to the shadow MMU code coming. But then I started to implement dirty bitmapping to MOL which has the video code in its own thread, so suddenly we had the dirty bitmap code run in parallel to the shadow mmu code. And with that came trouble. So I went ahead and made the MMU modifying functions as parallelizable as I could think of. I hope I didn't screw up too much RCU logic :-). If you know your way around RCU and locking and what needs to be done when, please take a look at this patch. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:17 +08:00
rcu_read_unlock();
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
}
void kvmppc_mmu_pte_vflush(struct kvm_vcpu *vcpu, u64 guest_vp, u64 vp_mask)
{
KVM: PPC: Add tracepoints for generic spte flushes The different ways of flusing shadow ptes have their own debug prints which use stupid old printk. Let's move them to tracepoints, making them easier available, faster and possible to activate on demand Signed-off-by: Alexander Graf <agraf@suse.de>
2010-08-02 19:40:30 +08:00
trace_kvm_book3s_mmu_flush("v", vcpu, guest_vp, vp_mask);
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
guest_vp &= vp_mask;
switch(vp_mask) {
case 0xfffffffffULL:
kvmppc_mmu_pte_vflush_short(vcpu, guest_vp);
break;
KVM: PPC: Book3S PR: Allow guest to use 64k pages This adds the code to interpret 64k HPTEs in the guest hashed page table (HPT), 64k SLB entries, and to tell the guest about 64k pages in kvm_vm_ioctl_get_smmu_info(). Guest 64k pages are still shadowed by 4k pages. This also adds another hash table to the four we have already in book3s_mmu_hpte.c to allow us to find all the PTEs that we have instantiated that match a given 64k guest page. The tlbie instruction changed starting with POWER6 to use a bit in the RB operand to indicate large page invalidations, and to use other RB bits to indicate the base and actual page sizes and the segment size. 64k pages came in slightly earlier, with POWER5++. We use one bit in vcpu->arch.hflags to indicate that the emulated cpu supports 64k pages, and another to indicate that it has the new tlbie definition. The KVM_PPC_GET_SMMU_INFO ioctl presents a bit of a problem, because the MMU capabilities depend on which CPU model we're emulating, but it is a VM ioctl not a VCPU ioctl and therefore doesn't get passed a VCPU fd. In addition, commonly-used userspace (QEMU) calls it before setting the PVR for any VCPU. Therefore, as a best effort we look at the first vcpu in the VM and return 64k pages or not depending on its capabilities. We also make the PVR default to the host PVR on recent CPUs that support 1TB segments (and therefore multiple page sizes as well) so that KVM_PPC_GET_SMMU_INFO will include 64k page and 1TB segment support on those CPUs. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2013-09-20 12:52:44 +08:00
#ifdef CONFIG_PPC_BOOK3S_64
case 0xffffffff0ULL:
kvmppc_mmu_pte_vflush_64k(vcpu, guest_vp);
break;
#endif
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
case 0xffffff000ULL:
kvmppc_mmu_pte_vflush_long(vcpu, guest_vp);
break;
default:
WARN_ON(1);
return;
}
}
void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, ulong pa_start, ulong pa_end)
{
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
struct hpte_cache *pte;
int i;
KVM: PPC: Add tracepoints for generic spte flushes The different ways of flusing shadow ptes have their own debug prints which use stupid old printk. Let's move them to tracepoints, making them easier available, faster and possible to activate on demand Signed-off-by: Alexander Graf <agraf@suse.de>
2010-08-02 19:40:30 +08:00
trace_kvm_book3s_mmu_flush("p", vcpu, pa_start, pa_end);
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
KVM: PPC: RCU'ify the Book3s MMU So far we've been running all code without locking of any sort. This wasn't really an issue because I didn't see any parallel access to the shadow MMU code coming. But then I started to implement dirty bitmapping to MOL which has the video code in its own thread, so suddenly we had the dirty bitmap code run in parallel to the shadow mmu code. And with that came trouble. So I went ahead and made the MMU modifying functions as parallelizable as I could think of. I hope I didn't screw up too much RCU logic :-). If you know your way around RCU and locking and what needs to be done when, please take a look at this patch. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:17 +08:00
rcu_read_lock();
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
for (i = 0; i < HPTEG_HASH_NUM_VPTE_LONG; i++) {
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
struct hlist_head *list = &vcpu3s->hpte_hash_vpte_long[i];
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
hlist: drop the node parameter from iterators I'm not sure why, but the hlist for each entry iterators were conceived list_for_each_entry(pos, head, member) The hlist ones were greedy and wanted an extra parameter: hlist_for_each_entry(tpos, pos, head, member) Why did they need an extra pos parameter? I'm not quite sure. Not only they don't really need it, it also prevents the iterator from looking exactly like the list iterator, which is unfortunate. Besides the semantic patch, there was some manual work required: - Fix up the actual hlist iterators in linux/list.h - Fix up the declaration of other iterators based on the hlist ones. - A very small amount of places were using the 'node' parameter, this was modified to use 'obj->member' instead. - Coccinelle didn't handle the hlist_for_each_entry_safe iterator properly, so those had to be fixed up manually. The semantic patch which is mostly the work of Peter Senna Tschudin is here: @@ iterator name hlist_for_each_entry, hlist_for_each_entry_continue, hlist_for_each_entry_from, hlist_for_each_entry_rcu, hlist_for_each_entry_rcu_bh, hlist_for_each_entry_continue_rcu_bh, for_each_busy_worker, ax25_uid_for_each, ax25_for_each, inet_bind_bucket_for_each, sctp_for_each_hentry, sk_for_each, sk_for_each_rcu, sk_for_each_from, sk_for_each_safe, sk_for_each_bound, hlist_for_each_entry_safe, hlist_for_each_entry_continue_rcu, nr_neigh_for_each, nr_neigh_for_each_safe, nr_node_for_each, nr_node_for_each_safe, for_each_gfn_indirect_valid_sp, for_each_gfn_sp, for_each_host; type T; expression a,c,d,e; identifier b; statement S; @@ -T b; <+... when != b ( hlist_for_each_entry(a, - b, c, d) S | hlist_for_each_entry_continue(a, - b, c) S | hlist_for_each_entry_from(a, - b, c) S | hlist_for_each_entry_rcu(a, - b, c, d) S | hlist_for_each_entry_rcu_bh(a, - b, c, d) S | hlist_for_each_entry_continue_rcu_bh(a, - b, c) S | for_each_busy_worker(a, c, - b, d) S | ax25_uid_for_each(a, - b, c) S | ax25_for_each(a, - b, c) S | inet_bind_bucket_for_each(a, - b, c) S | sctp_for_each_hentry(a, - b, c) S | sk_for_each(a, - b, c) S | sk_for_each_rcu(a, - b, c) S | sk_for_each_from -(a, b) +(a) S + sk_for_each_from(a) S | sk_for_each_safe(a, - b, c, d) S | sk_for_each_bound(a, - b, c) S | hlist_for_each_entry_safe(a, - b, c, d, e) S | hlist_for_each_entry_continue_rcu(a, - b, c) S | nr_neigh_for_each(a, - b, c) S | nr_neigh_for_each_safe(a, - b, c, d) S | nr_node_for_each(a, - b, c) S | nr_node_for_each_safe(a, - b, c, d) S | - for_each_gfn_sp(a, c, d, b) S + for_each_gfn_sp(a, c, d) S | - for_each_gfn_indirect_valid_sp(a, c, d, b) S + for_each_gfn_indirect_valid_sp(a, c, d) S | for_each_host(a, - b, c) S | for_each_host_safe(a, - b, c, d) S | for_each_mesh_entry(a, - b, c, d) S ) ...+> [akpm@linux-foundation.org: drop bogus change from net/ipv4/raw.c] [akpm@linux-foundation.org: drop bogus hunk from net/ipv6/raw.c] [akpm@linux-foundation.org: checkpatch fixes] [akpm@linux-foundation.org: fix warnings] [akpm@linux-foudnation.org: redo intrusive kvm changes] Tested-by: Peter Senna Tschudin <peter.senna@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Sasha Levin <sasha.levin@oracle.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Gleb Natapov <gleb@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-28 09:06:00 +08:00
hlist_for_each_entry_rcu(pte, list, list_vpte_long)
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
if ((pte->pte.raddr >= pa_start) &&
(pte->pte.raddr < pa_end))
invalidate_pte(vcpu, pte);
}
KVM: PPC: RCU'ify the Book3s MMU So far we've been running all code without locking of any sort. This wasn't really an issue because I didn't see any parallel access to the shadow MMU code coming. But then I started to implement dirty bitmapping to MOL which has the video code in its own thread, so suddenly we had the dirty bitmap code run in parallel to the shadow mmu code. And with that came trouble. So I went ahead and made the MMU modifying functions as parallelizable as I could think of. I hope I didn't screw up too much RCU logic :-). If you know your way around RCU and locking and what needs to be done when, please take a look at this patch. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:17 +08:00
rcu_read_unlock();
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
}
struct hpte_cache *kvmppc_mmu_hpte_cache_next(struct kvm_vcpu *vcpu)
{
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
struct hpte_cache *pte;
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
if (vcpu3s->hpte_cache_count == HPTEG_CACHE_NUM)
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
kvmppc_mmu_pte_flush_all(vcpu);
KVM: PPC: Book3S PR: Use mmu_notifier_retry() in kvmppc_mmu_map_page() When the MM code is invalidating a range of pages, it calls the KVM kvm_mmu_notifier_invalidate_range_start() notifier function, which calls kvm_unmap_hva_range(), which arranges to flush all the existing host HPTEs for guest pages. However, the Linux PTEs for the range being flushed are still valid at that point. We are not supposed to establish any new references to pages in the range until the ...range_end() notifier gets called. The PPC-specific KVM code doesn't get any explicit notification of that; instead, we are supposed to use mmu_notifier_retry() to test whether we are or have been inside a range flush notifier pair while we have been getting a page and instantiating a host HPTE for the page. This therefore adds a call to mmu_notifier_retry inside kvmppc_mmu_map_page(). This call is inside a region locked with kvm->mmu_lock, which is the same lock that is called by the KVM MMU notifier functions, thus ensuring that no new notification can proceed while we are in the locked region. Inside this region we also create the host HPTE and link the corresponding hpte_cache structure into the lists used to find it later. We cannot allocate the hpte_cache structure inside this locked region because that can lead to deadlock, so we allocate it outside the region and free it if we end up not using it. This also moves the updates of vcpu3s->hpte_cache_count inside the regions locked with vcpu3s->mmu_lock, and does the increment in kvmppc_mmu_hpte_cache_map() when the pte is added to the cache rather than when it is allocated, in order that the hpte_cache_count is accurate. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2013-09-20 12:52:52 +08:00
pte = kmem_cache_zalloc(hpte_cache, GFP_KERNEL);
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
return pte;
}
KVM: PPC: Book3S PR: Use mmu_notifier_retry() in kvmppc_mmu_map_page() When the MM code is invalidating a range of pages, it calls the KVM kvm_mmu_notifier_invalidate_range_start() notifier function, which calls kvm_unmap_hva_range(), which arranges to flush all the existing host HPTEs for guest pages. However, the Linux PTEs for the range being flushed are still valid at that point. We are not supposed to establish any new references to pages in the range until the ...range_end() notifier gets called. The PPC-specific KVM code doesn't get any explicit notification of that; instead, we are supposed to use mmu_notifier_retry() to test whether we are or have been inside a range flush notifier pair while we have been getting a page and instantiating a host HPTE for the page. This therefore adds a call to mmu_notifier_retry inside kvmppc_mmu_map_page(). This call is inside a region locked with kvm->mmu_lock, which is the same lock that is called by the KVM MMU notifier functions, thus ensuring that no new notification can proceed while we are in the locked region. Inside this region we also create the host HPTE and link the corresponding hpte_cache structure into the lists used to find it later. We cannot allocate the hpte_cache structure inside this locked region because that can lead to deadlock, so we allocate it outside the region and free it if we end up not using it. This also moves the updates of vcpu3s->hpte_cache_count inside the regions locked with vcpu3s->mmu_lock, and does the increment in kvmppc_mmu_hpte_cache_map() when the pte is added to the cache rather than when it is allocated, in order that the hpte_cache_count is accurate. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2013-09-20 12:52:52 +08:00
void kvmppc_mmu_hpte_cache_free(struct hpte_cache *pte)
{
kmem_cache_free(hpte_cache, pte);
}
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
void kvmppc_mmu_hpte_destroy(struct kvm_vcpu *vcpu)
{
kvmppc_mmu_pte_flush(vcpu, 0, 0);
}
static void kvmppc_mmu_hpte_init_hash(struct hlist_head *hash_list, int len)
{
int i;
for (i = 0; i < len; i++)
INIT_HLIST_HEAD(&hash_list[i]);
}
int kvmppc_mmu_hpte_init(struct kvm_vcpu *vcpu)
{
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
/* init hpte lookup hashes */
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_pte,
ARRAY_SIZE(vcpu3s->hpte_hash_pte));
kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_pte_long,
ARRAY_SIZE(vcpu3s->hpte_hash_pte_long));
kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_vpte,
ARRAY_SIZE(vcpu3s->hpte_hash_vpte));
kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_vpte_long,
ARRAY_SIZE(vcpu3s->hpte_hash_vpte_long));
KVM: PPC: Book3S PR: Allow guest to use 64k pages This adds the code to interpret 64k HPTEs in the guest hashed page table (HPT), 64k SLB entries, and to tell the guest about 64k pages in kvm_vm_ioctl_get_smmu_info(). Guest 64k pages are still shadowed by 4k pages. This also adds another hash table to the four we have already in book3s_mmu_hpte.c to allow us to find all the PTEs that we have instantiated that match a given 64k guest page. The tlbie instruction changed starting with POWER6 to use a bit in the RB operand to indicate large page invalidations, and to use other RB bits to indicate the base and actual page sizes and the segment size. 64k pages came in slightly earlier, with POWER5++. We use one bit in vcpu->arch.hflags to indicate that the emulated cpu supports 64k pages, and another to indicate that it has the new tlbie definition. The KVM_PPC_GET_SMMU_INFO ioctl presents a bit of a problem, because the MMU capabilities depend on which CPU model we're emulating, but it is a VM ioctl not a VCPU ioctl and therefore doesn't get passed a VCPU fd. In addition, commonly-used userspace (QEMU) calls it before setting the PVR for any VCPU. Therefore, as a best effort we look at the first vcpu in the VM and return 64k pages or not depending on its capabilities. We also make the PVR default to the host PVR on recent CPUs that support 1TB segments (and therefore multiple page sizes as well) so that KVM_PPC_GET_SMMU_INFO will include 64k page and 1TB segment support on those CPUs. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2013-09-20 12:52:44 +08:00
#ifdef CONFIG_PPC_BOOK3S_64
kvmppc_mmu_hpte_init_hash(vcpu3s->hpte_hash_vpte_64k,
ARRAY_SIZE(vcpu3s->hpte_hash_vpte_64k));
#endif
KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s This moves the slb field, which represents the state of the emulated SLB, from the kvmppc_vcpu_book3s struct to the kvm_vcpu_arch, and the hpte_hash_[v]pte[_long] fields from kvm_vcpu_arch to kvmppc_vcpu_book3s. This is in accord with the principle that the kvm_vcpu_arch struct represents the state of the emulated CPU, and the kvmppc_vcpu_book3s struct holds the auxiliary data structures used in the emulation. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-06-29 08:17:33 +08:00
spin_lock_init(&vcpu3s->mmu_lock);
KVM: PPC: RCU'ify the Book3s MMU So far we've been running all code without locking of any sort. This wasn't really an issue because I didn't see any parallel access to the shadow MMU code coming. But then I started to implement dirty bitmapping to MOL which has the video code in its own thread, so suddenly we had the dirty bitmap code run in parallel to the shadow mmu code. And with that came trouble. So I went ahead and made the MMU modifying functions as parallelizable as I could think of. I hope I didn't screw up too much RCU logic :-). If you know your way around RCU and locking and what needs to be done when, please take a look at this patch. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
2010-07-29 21:04:17 +08:00
KVM: PPC: Add generic hpte management functions Currently the shadow paging code keeps an array of entries it knows about. Whenever the guest invalidates an entry, we loop through that entry, trying to invalidate matching parts. While this is a really simple implementation, it is probably the most ineffective one possible. So instead, let's keep an array of lists around that are indexed by a hash. This way each PTE can be added by 4 list_add, removed by 4 list_del invocations and the search only needs to loop through entries that share the same hash. This patch implements said lookup and exports generic functions that both the 32-bit and 64-bit backend can use. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-06-30 21:18:45 +08:00
return 0;
}
int kvmppc_mmu_hpte_sysinit(void)
{
/* init hpte slab cache */
hpte_cache = kmem_cache_create("kvm-spt", sizeof(struct hpte_cache),
sizeof(struct hpte_cache), 0, NULL);
return 0;
}
void kvmppc_mmu_hpte_sysexit(void)
{
kmem_cache_destroy(hpte_cache);
}
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