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From: Sean Christopherson <seanjc@google.com>
To: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: kvm@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>,
	Hou Wenlong <houwenlong.hwl@antgroup.com>,
	Lai Jiangshan <laijs@linux.alibaba.com>
Subject: Re: [kvm-unit-tests PATCH V3] x86: Add a test to check effective permissions
Date: Tue, 8 Jun 2021 00:24:30 +0000	[thread overview]
Message-ID: <YL64voHPNZofL/s+@google.com> (raw)
In-Reply-To: <20210605174901.157556-1-jiangshanlai@gmail.com>

On Sun, Jun 06, 2021, Lai Jiangshan wrote:
> From: Lai Jiangshan <laijs@linux.alibaba.com>
> 
> Add a test to verify that KVM correctly handles the case where two or
> more non-leaf page table entries point at the same table gfn, but with
> different parent access permissions.
> 
> For example, here is a shared pagetable:
>    pgd[]   pud[]        pmd[]            virtual address pointers
>                      /->pmd1(u--)->pte1(uw-)->page1 <- ptr1 (u--)
>         /->pud1(uw-)--->pmd2(uw-)->pte2(uw-)->page2 <- ptr2 (uw-)
>    pgd-|           (shared pmd[] as above)
>         \->pud2(u--)--->pmd1(u--)->pte1(uw-)->page1 <- ptr3 (u--)
>                      \->pmd2(uw-)->pte2(uw-)->page2 <- ptr4 (u--)
>   pud1 and pud2 point to the same pmd table
> 
> The test is useful when TDP is not enabled.
> 
> Co-Developed-by: Hou Wenlong <houwenlong.hwl@antgroup.com>
> Signed-off-by: Hou Wenlong <houwenlong.hwl@antgroup.com>
> Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
> ---

Awesome, thanks!

Reviewed-by: Sean Christopherson <seanjc@google.com>

  reply	other threads:[~2021-06-08  0:24 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-03  5:05 [kvm-unit-tests PATCH] x86: test combined access Lai Jiangshan
2021-06-03 18:39 ` Sean Christopherson
2021-06-03 22:58   ` [kvm-unit-tests PATCH V2] x86: Add a test to check effective permissions Lai Jiangshan
2021-06-04 21:40     ` Sean Christopherson
2021-06-06  3:20       ` Lai Jiangshan
2021-06-05 17:49         ` [kvm-unit-tests PATCH V3] " Lai Jiangshan
2021-06-08  0:24           ` Sean Christopherson [this message]
2021-06-08 18:49           ` Paolo Bonzini

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