diff options
| author | Marcelo Tosatti <mtosatti@redhat.com> | 2009-08-25 01:13:10 -0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-09-24 08:44:03 -0700 |
| commit | 01e44f49de551da7ab12dab65eb9923bebf04be2 (patch) | |
| tree | d6f4450375e0b3c4b0e889784d7e2354809c8d88 | |
| parent | 5a3a29fefad07ca9dd99cf4c3da55c0694084f59 (diff) | |
KVM guest: do not batch pte updates from interrupt context
commit 6ba661787594868512a71c129062ebd57d0c01e7 upstream.
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.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | arch/x86/kernel/kvm.c | 7 |
1 files changed, 1 insertions, 6 deletions
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index c664d515f61..63b0ec8d3d4 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) |