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Fix for AMD processors.

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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull KVM fix from Paolo Bonzini:
 "This single patch fixes a regression caused by one of the
  optimizations introduced in 3.11, which is generally visible only on
  AMD processors"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: MMU: avoid fast page fault fixing mmio page fault
This commit is contained in:
Linus Torvalds 2013-07-19 10:17:12 -07:00
parent b7356abb9f 1c118b8226
commit b8a33fc725
1 changed files with 7 additions and 0 deletions
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7
arch/x86/kvm/mmu.c
View file

@ -2810,6 +2810,13 @@ exit:
static bool page_fault_can_be_fast(struct kvm_vcpu *vcpu, u32 error_code)
{
/*
* Do not fix the mmio spte with invalid generation number which
* need to be updated by slow page fault path.
*/
if (unlikely(error_code & PFERR_RSVD_MASK))
return false;
/*
* #PF can be fast only if the shadow page table is present and it
* is caused by write-protect, that means we just need change the