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342d3db763
linux/arch/powerpc/kvm/book3s_hv.c
Paul Mackerras 342d3db763 KVM: PPC: Implement MMU notifiers for Book3S HV guests 
This adds the infrastructure to enable us to page out pages underneath
a Book3S HV guest, on processors that support virtualized partition
memory, that is, POWER7.  Instead of pinning all the guest's pages,
we now look in the host userspace Linux page tables to find the
mapping for a given guest page.  Then, if the userspace Linux PTE
gets invalidated, kvm_unmap_hva() gets called for that address, and
we replace all the guest HPTEs that refer to that page with absent
HPTEs, i.e. ones with the valid bit clear and the HPTE_V_ABSENT bit
set, which will cause an HDSI when the guest tries to access them.
Finally, the page fault handler is extended to reinstantiate the
guest HPTE when the guest tries to access a page which has been paged
out.

Since we can't intercept the guest DSI and ISI interrupts on PPC970,
we still have to pin all the guest pages on PPC970.  We have a new flag,
kvm->arch.using_mmu_notifiers, that indicates whether we can page
guest pages out.  If it is not set, the MMU notifier callbacks do
nothing and everything operates as before.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
2012-03-05 14:52:38 +02:00

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/*
* Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
* Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
*
* Authors:
* Paul Mackerras <paulus@au1.ibm.com>
* Alexander Graf <agraf@suse.de>
* Kevin Wolf <mail@kevin-wolf.de>
*
* Description: KVM functions specific to running on Book 3S
* processors in hypervisor mode (specifically POWER7 and later).
*
* This file is derived from arch/powerpc/kvm/book3s.c,
* by 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.
*/
#include <linux/kvm_host.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/preempt.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/fs.h>
#include <linux/anon_inodes.h>
#include <linux/cpumask.h>
#include <linux/spinlock.h>
#include <linux/page-flags.h>
#include <asm/reg.h>
#include <asm/cputable.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/kvm_ppc.h>
#include <asm/kvm_book3s.h>
#include <asm/mmu_context.h>
#include <asm/lppaca.h>
#include <asm/processor.h>
#include <asm/cputhreads.h>
#include <asm/page.h>
#include <asm/hvcall.h>
#include <linux/gfp.h>
#include <linux/sched.h>
#include <linux/vmalloc.h>
#include <linux/highmem.h>
#include <linux/hugetlb.h>
/* #define EXIT_DEBUG */
/* #define EXIT_DEBUG_SIMPLE */
/* #define EXIT_DEBUG_INT */
static void kvmppc_end_cede(struct kvm_vcpu *vcpu);
static int kvmppc_hv_setup_rma(struct kvm_vcpu *vcpu);
void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
local_paca->kvm_hstate.kvm_vcpu = vcpu;
local_paca->kvm_hstate.kvm_vcore = vcpu->arch.vcore;
}
void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
{
}
void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 msr)
{
vcpu->arch.shregs.msr = msr;
kvmppc_end_cede(vcpu);
}
void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr)
{
vcpu->arch.pvr = pvr;
}
void kvmppc_dump_regs(struct kvm_vcpu *vcpu)
{
int r;
pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id);
pr_err("pc = %.16lx msr = %.16llx trap = %x\n",
vcpu->arch.pc, vcpu->arch.shregs.msr, vcpu->arch.trap);
for (r = 0; r < 16; ++r)
pr_err("r%2d = %.16lx r%d = %.16lx\n",
r, kvmppc_get_gpr(vcpu, r),
r+16, kvmppc_get_gpr(vcpu, r+16));
pr_err("ctr = %.16lx lr = %.16lx\n",
vcpu->arch.ctr, vcpu->arch.lr);
pr_err("srr0 = %.16llx srr1 = %.16llx\n",
vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1);
pr_err("sprg0 = %.16llx sprg1 = %.16llx\n",
vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1);
pr_err("sprg2 = %.16llx sprg3 = %.16llx\n",
vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3);
pr_err("cr = %.8x xer = %.16lx dsisr = %.8x\n",
vcpu->arch.cr, vcpu->arch.xer, vcpu->arch.shregs.dsisr);
pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar);
pr_err("fault dar = %.16lx dsisr = %.8x\n",
vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
pr_err("SLB (%d entries):\n", vcpu->arch.slb_max);
for (r = 0; r < vcpu->arch.slb_max; ++r)
pr_err(" ESID = %.16llx VSID = %.16llx\n",
vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv);
pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n",
vcpu->kvm->arch.lpcr, vcpu->kvm->arch.sdr1,
vcpu->arch.last_inst);
}
struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
{
int r;
struct kvm_vcpu *v, *ret = NULL;
mutex_lock(&kvm->lock);
kvm_for_each_vcpu(r, v, kvm) {
if (v->vcpu_id == id) {
ret = v;
break;
}
}
mutex_unlock(&kvm->lock);
return ret;
}
static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
{
vpa->shared_proc = 1;
vpa->yield_count = 1;
}
static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
unsigned long flags,
unsigned long vcpuid, unsigned long vpa)
{
struct kvm *kvm = vcpu->kvm;
unsigned long len, nb;
void *va;
struct kvm_vcpu *tvcpu;
int err = H_PARAMETER;
tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
if (!tvcpu)
return H_PARAMETER;
flags >>= 63 - 18;
flags &= 7;
if (flags == 0 || flags == 4)
return H_PARAMETER;
if (flags < 4) {
if (vpa & 0x7f)
return H_PARAMETER;
if (flags >= 2 && !tvcpu->arch.vpa)
return H_RESOURCE;
/* registering new area; convert logical addr to real */
va = kvmppc_pin_guest_page(kvm, vpa, &nb);
if (va == NULL)
return H_PARAMETER;
if (flags <= 1)
len = *(unsigned short *)(va + 4);
else
len = *(unsigned int *)(va + 4);
if (len > nb)
goto out_unpin;
switch (flags) {
case 1: /* register VPA */
if (len < 640)
goto out_unpin;
if (tvcpu->arch.vpa)
kvmppc_unpin_guest_page(kvm, vcpu->arch.vpa);
tvcpu->arch.vpa = va;
init_vpa(vcpu, va);
break;
case 2: /* register DTL */
if (len < 48)
goto out_unpin;
len -= len % 48;
if (tvcpu->arch.dtl)
kvmppc_unpin_guest_page(kvm, vcpu->arch.dtl);
tvcpu->arch.dtl = va;
tvcpu->arch.dtl_end = va + len;
break;
case 3: /* register SLB shadow buffer */
if (len < 16)
goto out_unpin;
if (tvcpu->arch.slb_shadow)
kvmppc_unpin_guest_page(kvm, vcpu->arch.slb_shadow);
tvcpu->arch.slb_shadow = va;
break;
}
} else {
switch (flags) {
case 5: /* unregister VPA */
if (tvcpu->arch.slb_shadow || tvcpu->arch.dtl)
return H_RESOURCE;
if (!tvcpu->arch.vpa)
break;
kvmppc_unpin_guest_page(kvm, tvcpu->arch.vpa);
tvcpu->arch.vpa = NULL;
break;
case 6: /* unregister DTL */
if (!tvcpu->arch.dtl)
break;
kvmppc_unpin_guest_page(kvm, tvcpu->arch.dtl);
tvcpu->arch.dtl = NULL;
break;
case 7: /* unregister SLB shadow buffer */
if (!tvcpu->arch.slb_shadow)
break;
kvmppc_unpin_guest_page(kvm, tvcpu->arch.slb_shadow);
tvcpu->arch.slb_shadow = NULL;
break;
}
}
return H_SUCCESS;
out_unpin:
kvmppc_unpin_guest_page(kvm, va);
return err;
}
int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
{
unsigned long req = kvmppc_get_gpr(vcpu, 3);
unsigned long target, ret = H_SUCCESS;
struct kvm_vcpu *tvcpu;
switch (req) {
case H_ENTER:
ret = kvmppc_virtmode_h_enter(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5),
kvmppc_get_gpr(vcpu, 6),
kvmppc_get_gpr(vcpu, 7));
break;
case H_CEDE:
break;
case H_PROD:
target = kvmppc_get_gpr(vcpu, 4);
tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
if (!tvcpu) {
ret = H_PARAMETER;
break;
}
tvcpu->arch.prodded = 1;
smp_mb();
if (vcpu->arch.ceded) {
if (waitqueue_active(&vcpu->wq)) {
wake_up_interruptible(&vcpu->wq);
vcpu->stat.halt_wakeup++;
}
}
break;
case H_CONFER:
break;
case H_REGISTER_VPA:
ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5),
kvmppc_get_gpr(vcpu, 6));
break;
default:
return RESUME_HOST;
}
kvmppc_set_gpr(vcpu, 3, ret);
vcpu->arch.hcall_needed = 0;
return RESUME_GUEST;
}
static int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
struct task_struct *tsk)
{
int r = RESUME_HOST;
vcpu->stat.sum_exits++;
run->exit_reason = KVM_EXIT_UNKNOWN;
run->ready_for_interrupt_injection = 1;
switch (vcpu->arch.trap) {
/* We're good on these - the host merely wanted to get our attention */
case BOOK3S_INTERRUPT_HV_DECREMENTER:
vcpu->stat.dec_exits++;
r = RESUME_GUEST;
break;
case BOOK3S_INTERRUPT_EXTERNAL:
vcpu->stat.ext_intr_exits++;
r = RESUME_GUEST;
break;
case BOOK3S_INTERRUPT_PERFMON:
r = RESUME_GUEST;
break;
case BOOK3S_INTERRUPT_PROGRAM:
{
ulong flags;
/*
* Normally program interrupts are delivered directly
* to the guest by the hardware, but we can get here
* as a result of a hypervisor emulation interrupt
* (e40) getting turned into a 700 by BML RTAS.
*/
flags = vcpu->arch.shregs.msr & 0x1f0000ull;
kvmppc_core_queue_program(vcpu, flags);
r = RESUME_GUEST;
break;
}
case BOOK3S_INTERRUPT_SYSCALL:
{
/* hcall - punt to userspace */
int i;
if (vcpu->arch.shregs.msr & MSR_PR) {
/* sc 1 from userspace - reflect to guest syscall */
kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_SYSCALL);
r = RESUME_GUEST;
break;
}
run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3);
for (i = 0; i < 9; ++i)
run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i);
run->exit_reason = KVM_EXIT_PAPR_HCALL;
vcpu->arch.hcall_needed = 1;
r = RESUME_HOST;
break;
}
/*
* We get these next two if the guest accesses a page which it thinks
* it has mapped but which is not actually present, either because
* it is for an emulated I/O device or because the corresonding
* host page has been paged out. Any other HDSI/HISI interrupts
* have been handled already.
*/
case BOOK3S_INTERRUPT_H_DATA_STORAGE:
r = kvmppc_book3s_hv_page_fault(run, vcpu,
vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
break;
case BOOK3S_INTERRUPT_H_INST_STORAGE:
r = kvmppc_book3s_hv_page_fault(run, vcpu,
kvmppc_get_pc(vcpu), 0);
break;
/*
* This occurs if the guest executes an illegal instruction.
* We just generate a program interrupt to the guest, since
* we don't emulate any guest instructions at this stage.
*/
case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
kvmppc_core_queue_program(vcpu, 0x80000);
r = RESUME_GUEST;
break;
default:
kvmppc_dump_regs(vcpu);
printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
vcpu->arch.trap, kvmppc_get_pc(vcpu),
vcpu->arch.shregs.msr);
r = RESUME_HOST;
BUG();
break;
}
return r;
}
int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
struct kvm_sregs *sregs)
{
int i;
sregs->pvr = vcpu->arch.pvr;
memset(sregs, 0, sizeof(struct kvm_sregs));
for (i = 0; i < vcpu->arch.slb_max; i++) {
sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige;
sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
}
return 0;
}
int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
struct kvm_sregs *sregs)
{
int i, j;
kvmppc_set_pvr(vcpu, sregs->pvr);
j = 0;
for (i = 0; i < vcpu->arch.slb_nr; i++) {
if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) {
vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe;
vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv;
++j;
}
}
vcpu->arch.slb_max = j;
return 0;
}
int kvmppc_core_check_processor_compat(void)
{
if (cpu_has_feature(CPU_FTR_HVMODE))
return 0;
return -EIO;
}
struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
{
struct kvm_vcpu *vcpu;
int err = -EINVAL;
int core;
struct kvmppc_vcore *vcore;
core = id / threads_per_core;
if (core >= KVM_MAX_VCORES)
goto out;
err = -ENOMEM;
vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
if (!vcpu)
goto out;
err = kvm_vcpu_init(vcpu, kvm, id);
if (err)
goto free_vcpu;
vcpu->arch.shared = &vcpu->arch.shregs;
vcpu->arch.last_cpu = -1;
vcpu->arch.mmcr[0] = MMCR0_FC;
vcpu->arch.ctrl = CTRL_RUNLATCH;
/* default to host PVR, since we can't spoof it */
vcpu->arch.pvr = mfspr(SPRN_PVR);
kvmppc_set_pvr(vcpu, vcpu->arch.pvr);
kvmppc_mmu_book3s_hv_init(vcpu);
/*
* We consider the vcpu stopped until we see the first run ioctl for it.
*/
vcpu->arch.state = KVMPPC_VCPU_STOPPED;
init_waitqueue_head(&vcpu->arch.cpu_run);
mutex_lock(&kvm->lock);
vcore = kvm->arch.vcores[core];
if (!vcore) {
vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL);
if (vcore) {
INIT_LIST_HEAD(&vcore->runnable_threads);
spin_lock_init(&vcore->lock);
init_waitqueue_head(&vcore->wq);
}
kvm->arch.vcores[core] = vcore;
}
mutex_unlock(&kvm->lock);
if (!vcore)
goto free_vcpu;
spin_lock(&vcore->lock);
++vcore->num_threads;
spin_unlock(&vcore->lock);
vcpu->arch.vcore = vcore;
vcpu->arch.cpu_type = KVM_CPU_3S_64;
kvmppc_sanity_check(vcpu);
return vcpu;
free_vcpu:
kfree(vcpu);
out:
return ERR_PTR(err);
}
void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
{
if (vcpu->arch.dtl)
kvmppc_unpin_guest_page(vcpu->kvm, vcpu->arch.dtl);
if (vcpu->arch.slb_shadow)
kvmppc_unpin_guest_page(vcpu->kvm, vcpu->arch.slb_shadow);
if (vcpu->arch.vpa)
kvmppc_unpin_guest_page(vcpu->kvm, vcpu->arch.vpa);
kvm_vcpu_uninit(vcpu);
kfree(vcpu);
}
static void kvmppc_set_timer(struct kvm_vcpu *vcpu)
{
unsigned long dec_nsec, now;
now = get_tb();
if (now > vcpu->arch.dec_expires) {
/* decrementer has already gone negative */
kvmppc_core_queue_dec(vcpu);
kvmppc_core_prepare_to_enter(vcpu);
return;
}
dec_nsec = (vcpu->arch.dec_expires - now) * NSEC_PER_SEC
/ tb_ticks_per_sec;
hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec),
HRTIMER_MODE_REL);
vcpu->arch.timer_running = 1;
}
static void kvmppc_end_cede(struct kvm_vcpu *vcpu)
{
vcpu->arch.ceded = 0;
if (vcpu->arch.timer_running) {
hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
vcpu->arch.timer_running = 0;
}
}
extern int __kvmppc_vcore_entry(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu);
extern void xics_wake_cpu(int cpu);
static void kvmppc_remove_runnable(struct kvmppc_vcore *vc,
struct kvm_vcpu *vcpu)
{
struct kvm_vcpu *v;
if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
return;
vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
--vc->n_runnable;
++vc->n_busy;
/* decrement the physical thread id of each following vcpu */
v = vcpu;
list_for_each_entry_continue(v, &vc->runnable_threads, arch.run_list)
--v->arch.ptid;
list_del(&vcpu->arch.run_list);
}
static void kvmppc_start_thread(struct kvm_vcpu *vcpu)
{
int cpu;
struct paca_struct *tpaca;
struct kvmppc_vcore *vc = vcpu->arch.vcore;
if (vcpu->arch.timer_running) {
hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
vcpu->arch.timer_running = 0;
}
cpu = vc->pcpu + vcpu->arch.ptid;
tpaca = &paca[cpu];
tpaca->kvm_hstate.kvm_vcpu = vcpu;
tpaca->kvm_hstate.kvm_vcore = vc;
tpaca->kvm_hstate.napping = 0;
vcpu->cpu = vc->pcpu;
smp_wmb();
#if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP)
if (vcpu->arch.ptid) {
tpaca->cpu_start = 0x80;
wmb();
xics_wake_cpu(cpu);
++vc->n_woken;
}
#endif
}
static void kvmppc_wait_for_nap(struct kvmppc_vcore *vc)
{
int i;
HMT_low();
i = 0;
while (vc->nap_count < vc->n_woken) {
if (++i >= 1000000) {
pr_err("kvmppc_wait_for_nap timeout %d %d\n",
vc->nap_count, vc->n_woken);
break;
}
cpu_relax();
}
HMT_medium();
}
/*
* Check that we are on thread 0 and that any other threads in
* this core are off-line.
*/
static int on_primary_thread(void)
{
int cpu = smp_processor_id();
int thr = cpu_thread_in_core(cpu);
if (thr)
return 0;
while (++thr < threads_per_core)
if (cpu_online(cpu + thr))
return 0;
return 1;
}
/*
* Run a set of guest threads on a physical core.
* Called with vc->lock held.
*/
static int kvmppc_run_core(struct kvmppc_vcore *vc)
{
struct kvm_vcpu *vcpu, *vcpu0, *vnext;
long ret;
u64 now;
int ptid;
/* don't start if any threads have a signal pending */
list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
if (signal_pending(vcpu->arch.run_task))
return 0;
/*
* Make sure we are running on thread 0, and that
* secondary threads are offline.
* XXX we should also block attempts to bring any
* secondary threads online.
*/
if (threads_per_core > 1 && !on_primary_thread()) {
list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
vcpu->arch.ret = -EBUSY;
goto out;
}
/*
* Assign physical thread IDs, first to non-ceded vcpus
* and then to ceded ones.
*/
ptid = 0;
vcpu0 = NULL;
list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
if (!vcpu->arch.ceded) {
if (!ptid)
vcpu0 = vcpu;
vcpu->arch.ptid = ptid++;
}
}
if (!vcpu0)
return 0; /* nothing to run */
list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
if (vcpu->arch.ceded)
vcpu->arch.ptid = ptid++;
vc->n_woken = 0;
vc->nap_count = 0;
vc->entry_exit_count = 0;
vc->vcore_state = VCORE_RUNNING;
vc->in_guest = 0;
vc->pcpu = smp_processor_id();
vc->napping_threads = 0;
list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
kvmppc_start_thread(vcpu);
preempt_disable();
spin_unlock(&vc->lock);
kvm_guest_enter();
__kvmppc_vcore_entry(NULL, vcpu0);
spin_lock(&vc->lock);
/* disable sending of IPIs on virtual external irqs */
list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
vcpu->cpu = -1;
/* wait for secondary threads to finish writing their state to memory */
if (vc->nap_count < vc->n_woken)
kvmppc_wait_for_nap(vc);
/* prevent other vcpu threads from doing kvmppc_start_thread() now */
vc->vcore_state = VCORE_EXITING;
spin_unlock(&vc->lock);
/* make sure updates to secondary vcpu structs are visible now */
smp_mb();
kvm_guest_exit();
preempt_enable();
kvm_resched(vcpu);
now = get_tb();
list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
/* cancel pending dec exception if dec is positive */
if (now < vcpu->arch.dec_expires &&
kvmppc_core_pending_dec(vcpu))
kvmppc_core_dequeue_dec(vcpu);
ret = RESUME_GUEST;
if (vcpu->arch.trap)
ret = kvmppc_handle_exit(vcpu->arch.kvm_run, vcpu,
vcpu->arch.run_task);
vcpu->arch.ret = ret;
vcpu->arch.trap = 0;
if (vcpu->arch.ceded) {
if (ret != RESUME_GUEST)
kvmppc_end_cede(vcpu);
else
kvmppc_set_timer(vcpu);
}
}
spin_lock(&vc->lock);
out:
vc->vcore_state = VCORE_INACTIVE;
list_for_each_entry_safe(vcpu, vnext, &vc->runnable_threads,
arch.run_list) {
if (vcpu->arch.ret != RESUME_GUEST) {
kvmppc_remove_runnable(vc, vcpu);
wake_up(&vcpu->arch.cpu_run);
}
}
return 1;
}
/*
* Wait for some other vcpu thread to execute us, and
* wake us up when we need to handle something in the host.
*/
static void kvmppc_wait_for_exec(struct kvm_vcpu *vcpu, int wait_state)
{
DEFINE_WAIT(wait);
prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state);
if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE)
schedule();
finish_wait(&vcpu->arch.cpu_run, &wait);
}
/*
* All the vcpus in this vcore are idle, so wait for a decrementer
* or external interrupt to one of the vcpus. vc->lock is held.
*/
static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
{
DEFINE_WAIT(wait);
struct kvm_vcpu *v;
int all_idle = 1;
prepare_to_wait(&vc->wq, &wait, TASK_INTERRUPTIBLE);
vc->vcore_state = VCORE_SLEEPING;
spin_unlock(&vc->lock);
list_for_each_entry(v, &vc->runnable_threads, arch.run_list) {
if (!v->arch.ceded || v->arch.pending_exceptions) {
all_idle = 0;
break;
}
}
if (all_idle)
schedule();
finish_wait(&vc->wq, &wait);
spin_lock(&vc->lock);
vc->vcore_state = VCORE_INACTIVE;
}
static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
{
int n_ceded;
int prev_state;
struct kvmppc_vcore *vc;
struct kvm_vcpu *v, *vn;
kvm_run->exit_reason = 0;
vcpu->arch.ret = RESUME_GUEST;
vcpu->arch.trap = 0;
/*
* Synchronize with other threads in this virtual core
*/
vc = vcpu->arch.vcore;
spin_lock(&vc->lock);
vcpu->arch.ceded = 0;
vcpu->arch.run_task = current;
vcpu->arch.kvm_run = kvm_run;
prev_state = vcpu->arch.state;
vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
list_add_tail(&vcpu->arch.run_list, &vc->runnable_threads);
++vc->n_runnable;
/*
* This happens the first time this is called for a vcpu.
* If the vcore is already running, we may be able to start
* this thread straight away and have it join in.
*/
if (prev_state == KVMPPC_VCPU_STOPPED) {
if (vc->vcore_state == VCORE_RUNNING &&
VCORE_EXIT_COUNT(vc) == 0) {
vcpu->arch.ptid = vc->n_runnable - 1;
kvmppc_start_thread(vcpu);
}
} else if (prev_state == KVMPPC_VCPU_BUSY_IN_HOST)
--vc->n_busy;
while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
!signal_pending(current)) {
if (vc->n_busy || vc->vcore_state != VCORE_INACTIVE) {
spin_unlock(&vc->lock);
kvmppc_wait_for_exec(vcpu, TASK_INTERRUPTIBLE);
spin_lock(&vc->lock);
continue;
}
n_ceded = 0;
list_for_each_entry(v, &vc->runnable_threads, arch.run_list)
n_ceded += v->arch.ceded;
if (n_ceded == vc->n_runnable)
kvmppc_vcore_blocked(vc);
else
kvmppc_run_core(vc);
list_for_each_entry_safe(v, vn, &vc->runnable_threads,
arch.run_list) {
kvmppc_core_prepare_to_enter(v);
if (signal_pending(v->arch.run_task)) {
kvmppc_remove_runnable(vc, v);
v->stat.signal_exits++;
v->arch.kvm_run->exit_reason = KVM_EXIT_INTR;
v->arch.ret = -EINTR;
wake_up(&v->arch.cpu_run);
}
}
}
if (signal_pending(current)) {
if (vc->vcore_state == VCORE_RUNNING ||
vc->vcore_state == VCORE_EXITING) {
spin_unlock(&vc->lock);
kvmppc_wait_for_exec(vcpu, TASK_UNINTERRUPTIBLE);
spin_lock(&vc->lock);
}
if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
kvmppc_remove_runnable(vc, vcpu);
vcpu->stat.signal_exits++;
kvm_run->exit_reason = KVM_EXIT_INTR;
vcpu->arch.ret = -EINTR;
}
}
spin_unlock(&vc->lock);
return vcpu->arch.ret;
}
int kvmppc_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu)
{
int r;
if (!vcpu->arch.sane) {
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
return -EINVAL;
}
kvmppc_core_prepare_to_enter(vcpu);
/* No need to go into the guest when all we'll do is come back out */
if (signal_pending(current)) {
run->exit_reason = KVM_EXIT_INTR;
return -EINTR;
}
/* On the first time here, set up VRMA or RMA */
if (!vcpu->kvm->arch.rma_setup_done) {
r = kvmppc_hv_setup_rma(vcpu);
if (r)
return r;
}
flush_fp_to_thread(current);
flush_altivec_to_thread(current);
flush_vsx_to_thread(current);
vcpu->arch.wqp = &vcpu->arch.vcore->wq;
vcpu->arch.pgdir = current->mm->pgd;
do {
r = kvmppc_run_vcpu(run, vcpu);
if (run->exit_reason == KVM_EXIT_PAPR_HCALL &&
!(vcpu->arch.shregs.msr & MSR_PR)) {
r = kvmppc_pseries_do_hcall(vcpu);
kvmppc_core_prepare_to_enter(vcpu);
}
} while (r == RESUME_GUEST);
return r;
}
static long kvmppc_stt_npages(unsigned long window_size)
{
return ALIGN((window_size >> SPAPR_TCE_SHIFT)
* sizeof(u64), PAGE_SIZE) / PAGE_SIZE;
}
static void release_spapr_tce_table(struct kvmppc_spapr_tce_table *stt)
{
struct kvm *kvm = stt->kvm;
int i;
mutex_lock(&kvm->lock);
list_del(&stt->list);
for (i = 0; i < kvmppc_stt_npages(stt->window_size); i++)
__free_page(stt->pages[i]);
kfree(stt);
mutex_unlock(&kvm->lock);
kvm_put_kvm(kvm);
}
static int kvm_spapr_tce_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct kvmppc_spapr_tce_table *stt = vma->vm_file->private_data;
struct page *page;
if (vmf->pgoff >= kvmppc_stt_npages(stt->window_size))
return VM_FAULT_SIGBUS;
page = stt->pages[vmf->pgoff];
get_page(page);
vmf->page = page;
return 0;
}
static const struct vm_operations_struct kvm_spapr_tce_vm_ops = {
.fault = kvm_spapr_tce_fault,
};
static int kvm_spapr_tce_mmap(struct file *file, struct vm_area_struct *vma)
{
vma->vm_ops = &kvm_spapr_tce_vm_ops;
return 0;
}
static int kvm_spapr_tce_release(struct inode *inode, struct file *filp)
{
struct kvmppc_spapr_tce_table *stt = filp->private_data;
release_spapr_tce_table(stt);
return 0;
}
static struct file_operations kvm_spapr_tce_fops = {
.mmap = kvm_spapr_tce_mmap,
.release = kvm_spapr_tce_release,
};
long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
struct kvm_create_spapr_tce *args)
{
struct kvmppc_spapr_tce_table *stt = NULL;
long npages;
int ret = -ENOMEM;
int i;
/* Check this LIOBN hasn't been previously allocated */
list_for_each_entry(stt, &kvm->arch.spapr_tce_tables, list) {
if (stt->liobn == args->liobn)
return -EBUSY;
}
npages = kvmppc_stt_npages(args->window_size);
stt = kzalloc(sizeof(*stt) + npages* sizeof(struct page *),
GFP_KERNEL);
if (!stt)
goto fail;
stt->liobn = args->liobn;
stt->window_size = args->window_size;
stt->kvm = kvm;
for (i = 0; i < npages; i++) {
stt->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO);
if (!stt->pages[i])
goto fail;
}
kvm_get_kvm(kvm);
mutex_lock(&kvm->lock);
list_add(&stt->list, &kvm->arch.spapr_tce_tables);
mutex_unlock(&kvm->lock);
return anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops,
stt, O_RDWR);
fail:
if (stt) {
for (i = 0; i < npages; i++)
if (stt->pages[i])
__free_page(stt->pages[i]);
kfree(stt);
}
return ret;
}
/* Work out RMLS (real mode limit selector) field value for a given RMA size.
Assumes POWER7 or PPC970. */
static inline int lpcr_rmls(unsigned long rma_size)
{
switch (rma_size) {
case 32ul << 20: /* 32 MB */
if (cpu_has_feature(CPU_FTR_ARCH_206))
return 8; /* only supported on POWER7 */
return -1;
case 64ul << 20: /* 64 MB */
return 3;
case 128ul << 20: /* 128 MB */
return 7;
case 256ul << 20: /* 256 MB */
return 4;
case 1ul << 30: /* 1 GB */
return 2;
case 16ul << 30: /* 16 GB */
return 1;
case 256ul << 30: /* 256 GB */
return 0;
default:
return -1;
}
}
static int kvm_rma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct kvmppc_rma_info *ri = vma->vm_file->private_data;
struct page *page;
if (vmf->pgoff >= ri->npages)
return VM_FAULT_SIGBUS;
page = pfn_to_page(ri->base_pfn + vmf->pgoff);
get_page(page);
vmf->page = page;
return 0;
}
static const struct vm_operations_struct kvm_rma_vm_ops = {
.fault = kvm_rma_fault,
};
static int kvm_rma_mmap(struct file *file, struct vm_area_struct *vma)
{
vma->vm_flags |= VM_RESERVED;
vma->vm_ops = &kvm_rma_vm_ops;
return 0;
}
static int kvm_rma_release(struct inode *inode, struct file *filp)
{
struct kvmppc_rma_info *ri = filp->private_data;
kvm_release_rma(ri);
return 0;
}
static struct file_operations kvm_rma_fops = {
.mmap = kvm_rma_mmap,
.release = kvm_rma_release,
};
long kvm_vm_ioctl_allocate_rma(struct kvm *kvm, struct kvm_allocate_rma *ret)
{
struct kvmppc_rma_info *ri;
long fd;
ri = kvm_alloc_rma();
if (!ri)
return -ENOMEM;
fd = anon_inode_getfd("kvm-rma", &kvm_rma_fops, ri, O_RDWR);
if (fd < 0)
kvm_release_rma(ri);
ret->rma_size = ri->npages << PAGE_SHIFT;
return fd;
}
static unsigned long slb_pgsize_encoding(unsigned long psize)
{
unsigned long senc = 0;
if (psize > 0x1000) {
senc = SLB_VSID_L;
if (psize == 0x10000)
senc |= SLB_VSID_LP_01;
}
return senc;
}
int kvmppc_core_prepare_memory_region(struct kvm *kvm,
struct kvm_userspace_memory_region *mem)
{
unsigned long npages;
unsigned long *phys;
/* Allocate a slot_phys array */
phys = kvm->arch.slot_phys[mem->slot];
if (!kvm->arch.using_mmu_notifiers && !phys) {
npages = mem->memory_size >> PAGE_SHIFT;
phys = vzalloc(npages * sizeof(unsigned long));
if (!phys)
return -ENOMEM;
kvm->arch.slot_phys[mem->slot] = phys;
kvm->arch.slot_npages[mem->slot] = npages;
}
return 0;
}
static void unpin_slot(struct kvm *kvm, int slot_id)
{
unsigned long *physp;
unsigned long j, npages, pfn;
struct page *page;
physp = kvm->arch.slot_phys[slot_id];
npages = kvm->arch.slot_npages[slot_id];
if (physp) {
spin_lock(&kvm->arch.slot_phys_lock);
for (j = 0; j < npages; j++) {
if (!(physp[j] & KVMPPC_GOT_PAGE))
continue;
pfn = physp[j] >> PAGE_SHIFT;
page = pfn_to_page(pfn);
if (PageHuge(page))
page = compound_head(page);
SetPageDirty(page);
put_page(page);
}
kvm->arch.slot_phys[slot_id] = NULL;
spin_unlock(&kvm->arch.slot_phys_lock);
vfree(physp);
}
}
void kvmppc_core_commit_memory_region(struct kvm *kvm,
struct kvm_userspace_memory_region *mem)
{
}
static int kvmppc_hv_setup_rma(struct kvm_vcpu *vcpu)
{
int err = 0;
struct kvm *kvm = vcpu->kvm;
struct kvmppc_rma_info *ri = NULL;
unsigned long hva;
struct kvm_memory_slot *memslot;
struct vm_area_struct *vma;
unsigned long lpcr, senc;
unsigned long psize, porder;
unsigned long rma_size;
unsigned long rmls;
unsigned long *physp;
unsigned long i, npages;
mutex_lock(&kvm->lock);
if (kvm->arch.rma_setup_done)
goto out; /* another vcpu beat us to it */
/* Look up the memslot for guest physical address 0 */
memslot = gfn_to_memslot(kvm, 0);
/* We must have some memory at 0 by now */
err = -EINVAL;
if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
goto out;
/* Look up the VMA for the start of this memory slot */
hva = memslot->userspace_addr;
down_read(&current->mm->mmap_sem);
vma = find_vma(current->mm, hva);
if (!vma || vma->vm_start > hva || (vma->vm_flags & VM_IO))
goto up_out;
psize = vma_kernel_pagesize(vma);
porder = __ilog2(psize);
/* Is this one of our preallocated RMAs? */
if (vma->vm_file && vma->vm_file->f_op == &kvm_rma_fops &&
hva == vma->vm_start)
ri = vma->vm_file->private_data;
up_read(&current->mm->mmap_sem);
if (!ri) {
/* On POWER7, use VRMA; on PPC970, give up */
err = -EPERM;
if (cpu_has_feature(CPU_FTR_ARCH_201)) {
pr_err("KVM: CPU requires an RMO\n");
goto out;
}
/* We can handle 4k, 64k or 16M pages in the VRMA */
err = -EINVAL;
if (!(psize == 0x1000 || psize == 0x10000 ||
psize == 0x1000000))
goto out;
/* Update VRMASD field in the LPCR */
senc = slb_pgsize_encoding(psize);
kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T |
(VRMA_VSID << SLB_VSID_SHIFT_1T);
lpcr = kvm->arch.lpcr & ~LPCR_VRMASD;
lpcr |= senc << (LPCR_VRMASD_SH - 4);
kvm->arch.lpcr = lpcr;
/* Create HPTEs in the hash page table for the VRMA */
kvmppc_map_vrma(vcpu, memslot, porder);
} else {
/* Set up to use an RMO region */
rma_size = ri->npages;
if (rma_size > memslot->npages)
rma_size = memslot->npages;
rma_size <<= PAGE_SHIFT;
rmls = lpcr_rmls(rma_size);
err = -EINVAL;
if (rmls < 0) {
pr_err("KVM: Can't use RMA of 0x%lx bytes\n", rma_size);
goto out;
}
atomic_inc(&ri->use_count);
kvm->arch.rma = ri;
/* Update LPCR and RMOR */
lpcr = kvm->arch.lpcr;
if (cpu_has_feature(CPU_FTR_ARCH_201)) {
/* PPC970; insert RMLS value (split field) in HID4 */
lpcr &= ~((1ul << HID4_RMLS0_SH) |
(3ul << HID4_RMLS2_SH));
lpcr |= ((rmls >> 2) << HID4_RMLS0_SH) |
((rmls & 3) << HID4_RMLS2_SH);
/* RMOR is also in HID4 */
lpcr |= ((ri->base_pfn >> (26 - PAGE_SHIFT)) & 0xffff)
<< HID4_RMOR_SH;
} else {
/* POWER7 */
lpcr &= ~(LPCR_VPM0 | LPCR_VRMA_L);
lpcr |= rmls << LPCR_RMLS_SH;
kvm->arch.rmor = kvm->arch.rma->base_pfn << PAGE_SHIFT;
}
kvm->arch.lpcr = lpcr;
pr_info("KVM: Using RMO at %lx size %lx (LPCR = %lx)\n",
ri->base_pfn << PAGE_SHIFT, rma_size, lpcr);
/* Initialize phys addrs of pages in RMO */
npages = ri->npages;
porder = __ilog2(npages);
physp = kvm->arch.slot_phys[memslot->id];
spin_lock(&kvm->arch.slot_phys_lock);
for (i = 0; i < npages; ++i)
physp[i] = ((ri->base_pfn + i) << PAGE_SHIFT) + porder;
spin_unlock(&kvm->arch.slot_phys_lock);
}
/* Order updates to kvm->arch.lpcr etc. vs. rma_setup_done */
smp_wmb();
kvm->arch.rma_setup_done = 1;
err = 0;
out:
mutex_unlock(&kvm->lock);
return err;
up_out:
up_read(&current->mm->mmap_sem);
goto out;
}
int kvmppc_core_init_vm(struct kvm *kvm)
{
long r;
unsigned long lpcr;
/* Allocate hashed page table */
r = kvmppc_alloc_hpt(kvm);
if (r)
return r;
INIT_LIST_HEAD(&kvm->arch.spapr_tce_tables);
kvm->arch.rma = NULL;
kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
if (cpu_has_feature(CPU_FTR_ARCH_201)) {
/* PPC970; HID4 is effectively the LPCR */
unsigned long lpid = kvm->arch.lpid;
kvm->arch.host_lpid = 0;
kvm->arch.host_lpcr = lpcr = mfspr(SPRN_HID4);
lpcr &= ~((3 << HID4_LPID1_SH) | (0xful << HID4_LPID5_SH));
lpcr |= ((lpid >> 4) << HID4_LPID1_SH) |
((lpid & 0xf) << HID4_LPID5_SH);
} else {
/* POWER7; init LPCR for virtual RMA mode */
kvm->arch.host_lpid = mfspr(SPRN_LPID);
kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR);
lpcr &= LPCR_PECE | LPCR_LPES;
lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE |
LPCR_VPM0 | LPCR_VPM1;
kvm->arch.vrma_slb_v = SLB_VSID_B_1T |
(VRMA_VSID << SLB_VSID_SHIFT_1T);
}
kvm->arch.lpcr = lpcr;
kvm->arch.using_mmu_notifiers = !!cpu_has_feature(CPU_FTR_ARCH_206);
spin_lock_init(&kvm->arch.slot_phys_lock);
return 0;
}
void kvmppc_core_destroy_vm(struct kvm *kvm)
{
unsigned long i;
if (!kvm->arch.using_mmu_notifiers)
for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
unpin_slot(kvm, i);
if (kvm->arch.rma) {
kvm_release_rma(kvm->arch.rma);
kvm->arch.rma = NULL;
}
kvmppc_free_hpt(kvm);
WARN_ON(!list_empty(&kvm->arch.spapr_tce_tables));
}
/* These are stubs for now */
void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, ulong pa_start, ulong pa_end)
{
}
/* We don't need to emulate any privileged instructions or dcbz */
int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned int inst, int *advance)
{
return EMULATE_FAIL;
}
int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
{
return EMULATE_FAIL;
}
int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
{
return EMULATE_FAIL;
}
static int kvmppc_book3s_hv_init(void)
{
int r;
r = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
if (r)
return r;
r = kvmppc_mmu_hv_init();
return r;
}
static void kvmppc_book3s_hv_exit(void)
{
kvm_exit();
}
module_init(kvmppc_book3s_hv_init);
module_exit(kvmppc_book3s_hv_exit);
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