linux-kernel - Re: [PATCH v2 2/7] KVM: nSVM: rename nested 'vmcb' to vmcb12

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Message-ID: <CALMp9eQycCn-wTUfFkqH3M7vzsRsYphO=GU8EwHt3tomnp=mng@mail.gmail.com>
Date:   Thu, 20 Aug 2020 14:00:55 -0700
From:   Jim Mattson <jmattson@...gle.com>
To:     Maxim Levitsky <mlevitsk@...hat.com>
Cc:     kvm list <kvm@...r.kernel.org>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" 
        <linux-kernel@...r.kernel.org>, "H. Peter Anvin" <hpa@...or.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Joerg Roedel <joro@...tes.org>,
        Wanpeng Li <wanpengli@...cent.com>,
        Borislav Petkov <bp@...en8.de>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH v2 2/7] KVM: nSVM: rename nested 'vmcb' to vmcb12_gpa in
 few places

On Thu, Aug 20, 2020 at 6:33 AM Maxim Levitsky <mlevitsk@...hat.com> wrote:
>
> No functional changes.
>
> Signed-off-by: Maxim Levitsky <mlevitsk@...hat.com>
> ---
>  arch/x86/kvm/svm/nested.c | 10 +++++-----
>  arch/x86/kvm/svm/svm.c    | 13 +++++++------
>  arch/x86/kvm/svm/svm.h    |  2 +-
>  3 files changed, 13 insertions(+), 12 deletions(-)
>
> diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
> index fb68467e6049..f5b17920a2ca 100644
> --- a/arch/x86/kvm/svm/nested.c
> +++ b/arch/x86/kvm/svm/nested.c
> @@ -431,7 +431,7 @@ int enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
For consistency, should the vmcb_gpa argument be renamed to vmcb12_gpa as well?


> @@ -579,7 +579,7 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
>
>         /* Exit Guest-Mode */
>         leave_guest_mode(&svm->vcpu);
> -       svm->nested.vmcb = 0;
> +       svm->nested.vmcb12_gpa = 0;
Perhaps in a follow-up change, this could be set to an illegal value
rather than 0?


> @@ -1018,7 +1018,7 @@ static int svm_get_nested_state(struct kvm_vcpu *vcpu,
>
>         /* First fill in the header and copy it out.  */
>         if (is_guest_mode(vcpu)) {
> -               kvm_state.hdr.svm.vmcb_pa = svm->nested.vmcb;
> +               kvm_state.hdr.svm.vmcb_pa = svm->nested.vmcb12_gpa;
It's unfortunate that we have "_pa" on the LHS on "_gpa" on the RHS. Oh, well.


> diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
> index 562a79e3e63a..d33013b9b4d7 100644
> --- a/arch/x86/kvm/svm/svm.c
> +++ b/arch/x86/kvm/svm/svm.c
> @@ -1102,7 +1102,7 @@ static void init_vmcb(struct vcpu_svm *svm)
>         }
>         svm->asid_generation = 0;
>
> -       svm->nested.vmcb = 0;
> +       svm->nested.vmcb12_gpa = 0;
Here, too, perhaps this could be changed from 0 to an illegal value in
a follow-up change.

Reviewed-by: Jim Mattson <jmattson@...gle.com>