Re: [PATCH 3/3] KVM: MMU: mark page dirty only when page is reallywritten

[Avi Kivity]

 On 07/27/2010 06:35 AM, Xiao Guangrong wrote:
> Mark page dirty only when this page is really written, it's more exacter,
> and also can fix dirty page marking in speculation path
>
> Signed-off-by: Xiao Guangrong<xiaoguangrong@xxxxxxxxxxxxxx>
> ---
>   arch/x86/kvm/mmu.c |   47 ++++++++++++++++++++++++++++-------------------
>   1 files changed, 28 insertions(+), 19 deletions(-)
>
> diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
> index dd6c192..bcc2173 100644
> --- a/arch/x86/kvm/mmu.c
> +++ b/arch/x86/kvm/mmu.c
> @@ -311,24 +311,42 @@ static bool spte_bits_lost(u64 spte)
>   	if (!is_shadow_present_pte(spte))
>   		return false;
>
> -	if (spte&  shadow_accessed_mask)
> +	if (spte&  shadow_accessed_mask&&
> +	      (!is_writable_pte(spte) || spte&  shadow_dirty_mask))
>   		return false;

Please add parentheses around bitwise operators to reduce confusion.  
The rest looks good.

--
error compiling committee.c: too many arguments to function

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