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authorLinus Torvalds <torvalds@linux-foundation.org>2013-01-10 09:05:18 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-01-10 09:05:18 -0800
commitccae663cd4f62890d862c660e5ed762eb9821c14 (patch)
tree7c9f110db7992aad60fcc01718a827affc4f33df /arch/x86
parent4ffd4ebf9d19c07285ea8a26d30a17ff28767132 (diff)
parent013f6a5d3dd9e4ebf4b49ca427b9c1f2e2a1b767 (diff)
Merge git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull KVM bugfixes from Marcelo Tosatti. * git://git.kernel.org/pub/scm/virt/kvm/kvm: KVM: x86: use dynamic percpu allocations for shared msrs area KVM: PPC: Book3S HV: Fix compilation without CONFIG_PPC_POWERNV powerpc: Corrected include header path in kvm_para.h Add rcu user eqs exception hooks for async page fault
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kernel/kvm.c12
-rw-r--r--arch/x86/kvm/x86.c24
2 files changed, 28 insertions, 8 deletions
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index 08b973f64032..9c2bd8bd4b4c 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -43,6 +43,7 @@
#include <asm/apicdef.h>
#include <asm/hypervisor.h>
#include <asm/kvm_guest.h>
+#include <asm/context_tracking.h>
static int kvmapf = 1;
@@ -121,6 +122,8 @@ void kvm_async_pf_task_wait(u32 token)
struct kvm_task_sleep_node n, *e;
DEFINE_WAIT(wait);
+ rcu_irq_enter();
+
spin_lock(&b->lock);
e = _find_apf_task(b, token);
if (e) {
@@ -128,6 +131,8 @@ void kvm_async_pf_task_wait(u32 token)
hlist_del(&e->link);
kfree(e);
spin_unlock(&b->lock);
+
+ rcu_irq_exit();
return;
}
@@ -152,13 +157,16 @@ void kvm_async_pf_task_wait(u32 token)
/*
* We cannot reschedule. So halt.
*/
+ rcu_irq_exit();
native_safe_halt();
+ rcu_irq_enter();
local_irq_disable();
}
}
if (!n.halted)
finish_wait(&n.wq, &wait);
+ rcu_irq_exit();
return;
}
EXPORT_SYMBOL_GPL(kvm_async_pf_task_wait);
@@ -252,10 +260,10 @@ do_async_page_fault(struct pt_regs *regs, unsigned long error_code)
break;
case KVM_PV_REASON_PAGE_NOT_PRESENT:
/* page is swapped out by the host. */
- rcu_irq_enter();
+ exception_enter(regs);
exit_idle();
kvm_async_pf_task_wait((u32)read_cr2());
- rcu_irq_exit();
+ exception_exit(regs);
break;
case KVM_PV_REASON_PAGE_READY:
rcu_irq_enter();
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 76f54461f7cb..c243b81e3c74 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -120,7 +120,7 @@ struct kvm_shared_msrs {
};
static struct kvm_shared_msrs_global __read_mostly shared_msrs_global;
-static DEFINE_PER_CPU(struct kvm_shared_msrs, shared_msrs);
+static struct kvm_shared_msrs __percpu *shared_msrs;
struct kvm_stats_debugfs_item debugfs_entries[] = {
{ "pf_fixed", VCPU_STAT(pf_fixed) },
@@ -191,10 +191,10 @@ static void kvm_on_user_return(struct user_return_notifier *urn)
static void shared_msr_update(unsigned slot, u32 msr)
{
- struct kvm_shared_msrs *smsr;
u64 value;
+ unsigned int cpu = smp_processor_id();
+ struct kvm_shared_msrs *smsr = per_cpu_ptr(shared_msrs, cpu);
- smsr = &__get_cpu_var(shared_msrs);
/* only read, and nobody should modify it at this time,
* so don't need lock */
if (slot >= shared_msrs_global.nr) {
@@ -226,7 +226,8 @@ static void kvm_shared_msr_cpu_online(void)
void kvm_set_shared_msr(unsigned slot, u64 value, u64 mask)
{
- struct kvm_shared_msrs *smsr = &__get_cpu_var(shared_msrs);
+ unsigned int cpu = smp_processor_id();
+ struct kvm_shared_msrs *smsr = per_cpu_ptr(shared_msrs, cpu);
if (((value ^ smsr->values[slot].curr) & mask) == 0)
return;
@@ -242,7 +243,8 @@ EXPORT_SYMBOL_GPL(kvm_set_shared_msr);
static void drop_user_return_notifiers(void *ignore)
{
- struct kvm_shared_msrs *smsr = &__get_cpu_var(shared_msrs);
+ unsigned int cpu = smp_processor_id();
+ struct kvm_shared_msrs *smsr = per_cpu_ptr(shared_msrs, cpu);
if (smsr->registered)
kvm_on_user_return(&smsr->urn);
@@ -5233,9 +5235,16 @@ int kvm_arch_init(void *opaque)
goto out;
}
+ r = -ENOMEM;
+ shared_msrs = alloc_percpu(struct kvm_shared_msrs);
+ if (!shared_msrs) {
+ printk(KERN_ERR "kvm: failed to allocate percpu kvm_shared_msrs\n");
+ goto out;
+ }
+
r = kvm_mmu_module_init();
if (r)
- goto out;
+ goto out_free_percpu;
kvm_set_mmio_spte_mask();
kvm_init_msr_list();
@@ -5258,6 +5267,8 @@ int kvm_arch_init(void *opaque)
return 0;
+out_free_percpu:
+ free_percpu(shared_msrs);
out:
return r;
}
@@ -5275,6 +5286,7 @@ void kvm_arch_exit(void)
#endif
kvm_x86_ops = NULL;
kvm_mmu_module_exit();
+ free_percpu(shared_msrs);
}
int kvm_emulate_halt(struct kvm_vcpu *vcpu)