KVM guest: do not batch pte updates from interrupt context

Commit b8bcfe997e4 made paravirt pte updates synchronous in interrupt
context.

Unfortunately the KVM pv mmu code caches the lazy/nonlazy mode
internally, so a pte update from interrupt context during a lazy mmu
operation can be batched while it should be performed synchronously.

https://bugzilla.redhat.com/show_bug.cgi?id=518022

Drop the internal mode variable and use paravirt_get_lazy_mode(), which
returns the correct state.

Cc: stable@kernel.org
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 1 insertions, 6 deletions

diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index c664d515f613..63b0ec8d3d4a 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -34,7 +34,6 @@
 struct kvm_para_state {
         u8 mmu_queue[MMU_QUEUE_SIZE];
         int mmu_queue_len;
-        enum paravirt_lazy_mode mode;
 };
 
 static DEFINE_PER_CPU(struct kvm_para_state, para_state);
@@ -77,7 +76,7 @@ static void kvm_deferred_mmu_op(void *buffer, int len)
 {
         struct kvm_para_state *state = kvm_para_state();
 
-        if (state->mode != PARAVIRT_LAZY_MMU) {
+        if (paravirt_get_lazy_mode() != PARAVIRT_LAZY_MMU) {
                 kvm_mmu_op(buffer, len);
                 return;
         }
@@ -185,10 +184,7 @@ static void kvm_release_pt(unsigned long pfn)
 
 static void kvm_enter_lazy_mmu(void)
 {
-        struct kvm_para_state *state = kvm_para_state();
-
         paravirt_enter_lazy_mmu();
-        state->mode = paravirt_get_lazy_mode();
 }
 
 static void kvm_leave_lazy_mmu(void)
@@ -197,7 +193,6 @@ static void kvm_leave_lazy_mmu(void)
 
         mmu_queue_flush(state);
         paravirt_leave_lazy_mmu();
-        state->mode = paravirt_get_lazy_mode();
 }
 
 static void __init paravirt_ops_setup(void)