linux-kernel - Re: [PATCH v2 3/6] KVM: Documentation: Add the missing description for ptep in kvm_mmu

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <c56550ddeefd99aff5db5b4b81a464de8ca0e88a.camel@intel.com>
Date:   Mon, 26 Jun 2023 22:20:57 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "mizhang@...gle.com" <mizhang@...gle.com>
CC:     "jmattson@...gle.com" <jmattson@...gle.com>,
        "Xu, Yilun" <yilun.xu@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "dmatlack@...gle.com" <dmatlack@...gle.com>,
        "zhi.wang.linux@...il.com" <zhi.wang.linux@...il.com>,
        "bgardon@...gle.com" <bgardon@...gle.com>
Subject: Re: [PATCH v2 3/6] KVM: Documentation: Add the missing description
 for ptep in kvm_mmu_page

On Mon, 2023-06-26 at 18:20 +0000, Mingwei Zhang wrote:
> Add the missing description for ptep in kvm_mmu_page description. ptep is
> used when TDP MMU is enabled and it shares the storage with parent_ptes.
> Update the doc to help readers to get up-to-date info.
> 
> Signed-off-by: Mingwei Zhang <mizhang@...gle.com>
> ---
>  Documentation/virt/kvm/x86/mmu.rst | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/virt/kvm/x86/mmu.rst b/Documentation/virt/kvm/x86/mmu.rst
> index 4c9044b4dc6c..5cd6cd5e8926 100644
> --- a/Documentation/virt/kvm/x86/mmu.rst
> +++ b/Documentation/virt/kvm/x86/mmu.rst
> @@ -237,6 +237,11 @@ Shadow pages contain the following information:
>      parent_ptes points at this single spte, otherwise, there exists multiple
>      sptes pointing at this page and (parent_ptes & ~0x1) points at a data
>      structure with a list of parent sptes.
> +  ptep:
> +    The reverse mapping for the pte pointing at this page's spt. This field is
> +    used in replace of parent_ptes when TDP MMU is used. In TDP MMU, each
> +    non-root shadow page will have one parent, while each root shadow page has
> +    no parent. Note that this field is a union with parent_ptes.
>    unsync:
>      If true, then the translations in this page may not match the guest's
>      translation.  This is equivalent to the state of the tlb when a pte is
> -- 
> 2.41.0.162.gfafddb0af9-goog
> 

Reviewed-by: Kai Huang <kai.huang@...el.com>