On Tue, Feb 25, 2014 at 10:44:54PM -0300, Marcelo Tosatti wrote:
> 
> emulator_cmpxchg_emulated writes to guest memory, therefore it should
> updated the dirty bitmap accordingly.

s/updated/update/

> 
> Signed-off-by: Marcelo Tosatti <mtosa...@redhat.com>
> 
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 39c28f09..29db96d 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -4394,6 +4394,7 @@ static int emulator_cmpxchg_emulated(struct 
> x86_emulate_ctxt *ctxt,
>       if (!exchanged)
>               return X86EMUL_CMPXCHG_FAILED;
>  
> +     mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
>       kvm_mmu_pte_write(vcpu, gpa, new, bytes);
>  
>       return X86EMUL_CONTINUE;
> --
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