mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 16:54:20 +08:00
KVM: s390: streamline memslot handling
This patch relocates the variables kvm-s390 uses to track guest mem addr/size. As discussed dropping the variables at struct kvm_arch level allows to use the common vcpu->request based mechanism to reload guest memory if e.g. changes via set_memory_region. The kick mechanism introduced in this series is used to ensure running vcpus leave guest state to catch the update. Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Christian Ehrhardt
Avi Kivity
parent
b1d16c495d
commit
628eb9b8a8
@ -1,7 +1,7 @@
|
||||
/*
|
||||
* asm-s390/kvm_host.h - definition for kernel virtual machines on s390
|
||||
*
|
||||
* Copyright IBM Corp. 2008
|
||||
* Copyright IBM Corp. 2008,2009
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License (version 2 only)
|
||||
@ -228,8 +228,6 @@ struct kvm_vm_stat {
|
||||
};
|
||||
|
||||
struct kvm_arch{
|
||||
unsigned long guest_origin;
|
||||
unsigned long guest_memsize;
|
||||
struct sca_block *sca;
|
||||
debug_info_t *dbf;
|
||||
struct kvm_s390_float_interrupt float_int;
|
||||
|
||||
@ -1,7 +1,7 @@
|
||||
/*
|
||||
* gaccess.h - access guest memory
|
||||
*
|
||||
* Copyright IBM Corp. 2008
|
||||
* Copyright IBM Corp. 2008,2009
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License (version 2 only)
|
||||
@ -16,13 +16,14 @@
|
||||
#include <linux/compiler.h>
|
||||
#include <linux/kvm_host.h>
|
||||
#include <asm/uaccess.h>
|
||||
#include "kvm-s390.h"
|
||||
|
||||
static inline void __user *__guestaddr_to_user(struct kvm_vcpu *vcpu,
|
||||
unsigned long guestaddr)
|
||||
{
|
||||
unsigned long prefix = vcpu->arch.sie_block->prefix;
|
||||
unsigned long origin = vcpu->kvm->arch.guest_origin;
|
||||
unsigned long memsize = vcpu->kvm->arch.guest_memsize;
|
||||
unsigned long origin = vcpu->arch.sie_block->gmsor;
|
||||
unsigned long memsize = kvm_s390_vcpu_get_memsize(vcpu);
|
||||
|
||||
if (guestaddr < 2 * PAGE_SIZE)
|
||||
guestaddr += prefix;
|
||||
@ -158,8 +159,8 @@ static inline int copy_to_guest(struct kvm_vcpu *vcpu, unsigned long guestdest,
|
||||
const void *from, unsigned long n)
|
||||
{
|
||||
unsigned long prefix = vcpu->arch.sie_block->prefix;
|
||||
unsigned long origin = vcpu->kvm->arch.guest_origin;
|
||||
unsigned long memsize = vcpu->kvm->arch.guest_memsize;
|
||||
unsigned long origin = vcpu->arch.sie_block->gmsor;
|
||||
unsigned long memsize = kvm_s390_vcpu_get_memsize(vcpu);
|
||||
|
||||
if ((guestdest < 2 * PAGE_SIZE) && (guestdest + n > 2 * PAGE_SIZE))
|
||||
goto slowpath;
|
||||
@ -209,8 +210,8 @@ static inline int copy_from_guest(struct kvm_vcpu *vcpu, void *to,
|
||||
unsigned long guestsrc, unsigned long n)
|
||||
{
|
||||
unsigned long prefix = vcpu->arch.sie_block->prefix;
|
||||
unsigned long origin = vcpu->kvm->arch.guest_origin;
|
||||
unsigned long memsize = vcpu->kvm->arch.guest_memsize;
|
||||
unsigned long origin = vcpu->arch.sie_block->gmsor;
|
||||
unsigned long memsize = kvm_s390_vcpu_get_memsize(vcpu);
|
||||
|
||||
if ((guestsrc < 2 * PAGE_SIZE) && (guestsrc + n > 2 * PAGE_SIZE))
|
||||
goto slowpath;
|
||||
@ -244,8 +245,8 @@ static inline int copy_to_guest_absolute(struct kvm_vcpu *vcpu,
|
||||
unsigned long guestdest,
|
||||
const void *from, unsigned long n)
|
||||
{
|
||||
unsigned long origin = vcpu->kvm->arch.guest_origin;
|
||||
unsigned long memsize = vcpu->kvm->arch.guest_memsize;
|
||||
unsigned long origin = vcpu->arch.sie_block->gmsor;
|
||||
unsigned long memsize = kvm_s390_vcpu_get_memsize(vcpu);
|
||||
|
||||
if (guestdest + n > memsize)
|
||||
return -EFAULT;
|
||||
@ -262,8 +263,8 @@ static inline int copy_from_guest_absolute(struct kvm_vcpu *vcpu, void *to,
|
||||
unsigned long guestsrc,
|
||||
unsigned long n)
|
||||
{
|
||||
unsigned long origin = vcpu->kvm->arch.guest_origin;
|
||||
unsigned long memsize = vcpu->kvm->arch.guest_memsize;
|
||||
unsigned long origin = vcpu->arch.sie_block->gmsor;
|
||||
unsigned long memsize = kvm_s390_vcpu_get_memsize(vcpu);
|
||||
|
||||
if (guestsrc + n > memsize)
|
||||
return -EFAULT;
|
||||
|
||||
@ -1,7 +1,7 @@
|
||||
/*
|
||||
* intercept.c - in-kernel handling for sie intercepts
|
||||
*
|
||||
* Copyright IBM Corp. 2008
|
||||
* Copyright IBM Corp. 2008,2009
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License (version 2 only)
|
||||
@ -164,9 +164,9 @@ static int handle_validity(struct kvm_vcpu *vcpu)
|
||||
|
||||
vcpu->stat.exit_validity++;
|
||||
if ((viwhy == 0x37) && (vcpu->arch.sie_block->prefix
|
||||
<= vcpu->kvm->arch.guest_memsize - 2*PAGE_SIZE)){
|
||||
<= kvm_s390_vcpu_get_memsize(vcpu) - 2*PAGE_SIZE)) {
|
||||
rc = fault_in_pages_writeable((char __user *)
|
||||
vcpu->kvm->arch.guest_origin +
|
||||
vcpu->arch.sie_block->gmsor +
|
||||
vcpu->arch.sie_block->prefix,
|
||||
2*PAGE_SIZE);
|
||||
if (rc)
|
||||
|
||||
@ -1,7 +1,7 @@
|
||||
/*
|
||||
* s390host.c -- hosting zSeries kernel virtual machines
|
||||
*
|
||||
* Copyright IBM Corp. 2008
|
||||
* Copyright IBM Corp. 2008,2009
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License (version 2 only)
|
||||
@ -10,6 +10,7 @@
|
||||
* Author(s): Carsten Otte <cotte@de.ibm.com>
|
||||
* Christian Borntraeger <borntraeger@de.ibm.com>
|
||||
* Heiko Carstens <heiko.carstens@de.ibm.com>
|
||||
* Christian Ehrhardt <ehrhardt@de.ibm.com>
|
||||
*/
|
||||
|
||||
#include <linux/compiler.h>
|
||||
@ -278,16 +279,10 @@ static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu)
|
||||
vcpu->arch.sie_block->gbea = 1;
|
||||
}
|
||||
|
||||
/* The current code can have up to 256 pages for virtio */
|
||||
#define VIRTIODESCSPACE (256ul * 4096ul)
|
||||
|
||||
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
|
||||
{
|
||||
atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH);
|
||||
vcpu->arch.sie_block->gmslm = vcpu->kvm->arch.guest_memsize +
|
||||
vcpu->kvm->arch.guest_origin +
|
||||
VIRTIODESCSPACE - 1ul;
|
||||
vcpu->arch.sie_block->gmsor = vcpu->kvm->arch.guest_origin;
|
||||
set_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests);
|
||||
vcpu->arch.sie_block->ecb = 2;
|
||||
vcpu->arch.sie_block->eca = 0xC1002001U;
|
||||
vcpu->arch.sie_block->fac = (int) (long) facilities;
|
||||
@ -491,9 +486,14 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
|
||||
vcpu_load(vcpu);
|
||||
|
||||
rerun_vcpu:
|
||||
if (vcpu->requests)
|
||||
if (test_and_clear_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests))
|
||||
kvm_s390_vcpu_set_mem(vcpu);
|
||||
|
||||
/* verify, that memory has been registered */
|
||||
if (!vcpu->kvm->arch.guest_memsize) {
|
||||
if (!vcpu->arch.sie_block->gmslm) {
|
||||
vcpu_put(vcpu);
|
||||
VCPU_EVENT(vcpu, 3, "%s", "no memory registered to run vcpu");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
@ -691,7 +691,7 @@ int kvm_arch_set_memory_region(struct kvm *kvm,
|
||||
vmas. It is okay to mmap() and munmap() stuff in this slot after
|
||||
doing this call at any time */
|
||||
|
||||
if (mem->slot || kvm->arch.guest_memsize)
|
||||
if (mem->slot)
|
||||
return -EINVAL;
|
||||
|
||||
if (mem->guest_phys_addr)
|
||||
@ -706,36 +706,18 @@ int kvm_arch_set_memory_region(struct kvm *kvm,
|
||||
if (!user_alloc)
|
||||
return -EINVAL;
|
||||
|
||||
/* lock all vcpus */
|
||||
for (i = 0; i < KVM_MAX_VCPUS; ++i) {
|
||||
if (!kvm->vcpus[i])
|
||||
continue;
|
||||
if (!mutex_trylock(&kvm->vcpus[i]->mutex))
|
||||
goto fail_out;
|
||||
}
|
||||
|
||||
kvm->arch.guest_origin = mem->userspace_addr;
|
||||
kvm->arch.guest_memsize = mem->memory_size;
|
||||
|
||||
/* update sie control blocks, and unlock all vcpus */
|
||||
/* request update of sie control block for all available vcpus */
|
||||
for (i = 0; i < KVM_MAX_VCPUS; ++i) {
|
||||
if (kvm->vcpus[i]) {
|
||||
kvm->vcpus[i]->arch.sie_block->gmsor =
|
||||
kvm->arch.guest_origin;
|
||||
kvm->vcpus[i]->arch.sie_block->gmslm =
|
||||
kvm->arch.guest_memsize +
|
||||
kvm->arch.guest_origin +
|
||||
VIRTIODESCSPACE - 1ul;
|
||||
mutex_unlock(&kvm->vcpus[i]->mutex);
|
||||
if (test_and_set_bit(KVM_REQ_MMU_RELOAD,
|
||||
&kvm->vcpus[i]->requests))
|
||||
continue;
|
||||
kvm_s390_inject_sigp_stop(kvm->vcpus[i],
|
||||
ACTION_RELOADVCPU_ON_STOP);
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
fail_out:
|
||||
for (; i >= 0; i--)
|
||||
mutex_unlock(&kvm->vcpus[i]->mutex);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
void kvm_arch_flush_shadow(struct kvm *kvm)
|
||||
|
||||
@ -1,7 +1,7 @@
|
||||
/*
|
||||
* kvm_s390.h - definition for kvm on s390
|
||||
*
|
||||
* Copyright IBM Corp. 2008
|
||||
* Copyright IBM Corp. 2008,2009
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License (version 2 only)
|
||||
@ -9,6 +9,7 @@
|
||||
*
|
||||
* Author(s): Carsten Otte <cotte@de.ibm.com>
|
||||
* Christian Borntraeger <borntraeger@de.ibm.com>
|
||||
* Christian Ehrhardt <ehrhardt@de.ibm.com>
|
||||
*/
|
||||
|
||||
#ifndef ARCH_S390_KVM_S390_H
|
||||
@ -18,6 +19,9 @@
|
||||
#include <linux/kvm.h>
|
||||
#include <linux/kvm_host.h>
|
||||
|
||||
/* The current code can have up to 256 pages for virtio */
|
||||
#define VIRTIODESCSPACE (256ul * 4096ul)
|
||||
|
||||
typedef int (*intercept_handler_t)(struct kvm_vcpu *vcpu);
|
||||
|
||||
/* negativ values are error codes, positive values for internal conditions */
|
||||
@ -54,6 +58,29 @@ int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
|
||||
int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code);
|
||||
int kvm_s390_inject_sigp_stop(struct kvm_vcpu *vcpu, int action);
|
||||
|
||||
static inline int kvm_s390_vcpu_get_memsize(struct kvm_vcpu *vcpu)
|
||||
{
|
||||
return vcpu->arch.sie_block->gmslm
|
||||
- vcpu->arch.sie_block->gmsor
|
||||
- VIRTIODESCSPACE + 1ul;
|
||||
}
|
||||
|
||||
static inline void kvm_s390_vcpu_set_mem(struct kvm_vcpu *vcpu)
|
||||
{
|
||||
struct kvm_memory_slot *mem;
|
||||
|
||||
down_read(&vcpu->kvm->slots_lock);
|
||||
mem = &vcpu->kvm->memslots[0];
|
||||
|
||||
vcpu->arch.sie_block->gmsor = mem->userspace_addr;
|
||||
vcpu->arch.sie_block->gmslm =
|
||||
mem->userspace_addr +
|
||||
(mem->npages << PAGE_SHIFT) +
|
||||
VIRTIODESCSPACE - 1ul;
|
||||
|
||||
up_read(&vcpu->kvm->slots_lock);
|
||||
}
|
||||
|
||||
/* implemented in priv.c */
|
||||
int kvm_s390_handle_b2(struct kvm_vcpu *vcpu);
|
||||
|
||||
|
||||
@ -189,9 +189,9 @@ static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
|
||||
/* make sure that the new value is valid memory */
|
||||
address = address & 0x7fffe000u;
|
||||
if ((copy_from_guest(vcpu, &tmp,
|
||||
(u64) (address + vcpu->kvm->arch.guest_origin) , 1)) ||
|
||||
(u64) (address + vcpu->arch.sie_block->gmsor) , 1)) ||
|
||||
(copy_from_guest(vcpu, &tmp, (u64) (address +
|
||||
vcpu->kvm->arch.guest_origin + PAGE_SIZE), 1))) {
|
||||
vcpu->arch.sie_block->gmsor + PAGE_SIZE), 1))) {
|
||||
*reg |= SIGP_STAT_INVALID_PARAMETER;
|
||||
return 1; /* invalid parameter */
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user