linux-kernel - Re: [PATCH 1/10] KVM MMU: fix for calculating gpa in invlpg code

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Message-ID: <4BD18343.3050407@redhat.com>
Date:	Fri, 23 Apr 2010 14:23:47 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	KVM list <kvm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/10] KVM MMU: fix for calculating gpa in invlpg code

On 04/22/2010 09:12 AM, Xiao Guangrong wrote:
> If the guest is 32-bit, we should use 'quadrant' to adjust gpa
> offset
>
>    

Good catch.  Only affects kvm_mmu_pte_write(), so I don't think this had 
ill effects other than not prefetching the correct address?

> @@ -478,9 +478,14 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva)
>   		    ((level == PT_DIRECTORY_LEVEL&&  is_large_pte(*sptep))) ||
>   		    ((level == PT_PDPE_LEVEL&&  is_large_pte(*sptep)))) {
>   			struct kvm_mmu_page *sp = page_header(__pa(sptep));
> +			int offset = 0;
> +
> +			if (PTTYPE == 32)
> +				offset = sp->role.quadrant<<  PT64_LEVEL_BITS;;
>    

Wrong for PT_DIRECTORY_LEVEL (should be q << 8).  Also, too many 
semicolons.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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