linux-kernel - Re: [PATCH v8 18/18] KVM: SVM: Enable SEV live migration feature implicitly on Incoming VM(s).

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Date:   Fri, 29 May 2020 19:09:08 -0700
From:   Steve Rutherford <srutherford@...gle.com>
To:     Ashish Kalra <Ashish.Kalra@....com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Joerg Roedel <joro@...tes.org>,
        Borislav Petkov <bp@...e.de>,
        Tom Lendacky <Thomas.Lendacky@....com>,
        X86 ML <x86@...nel.org>, KVM list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        David Rientjes <rientjes@...gle.com>,
        Venu Busireddy <venu.busireddy@...cle.com>,
        Brijesh Singh <brijesh.singh@....com>
Subject: Re: [PATCH v8 18/18] KVM: SVM: Enable SEV live migration feature
 implicitly on Incoming VM(s).

On Tue, May 5, 2020 at 2:22 PM Ashish Kalra <Ashish.Kalra@....com> wrote:
>
> From: Ashish Kalra <ashish.kalra@....com>
>
> For source VM, live migration feature is enabled explicitly
> when the guest is booting, for the incoming VM(s) it is implied.
> This is required for handling A->B->C->... VM migrations case.
>
> Signed-off-by: Ashish Kalra <ashish.kalra@....com>
> ---
>  arch/x86/kvm/svm/sev.c | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
> index 6f69c3a47583..ba7c0ebfa1f3 100644
> --- a/arch/x86/kvm/svm/sev.c
> +++ b/arch/x86/kvm/svm/sev.c
> @@ -1592,6 +1592,13 @@ int svm_set_page_enc_bitmap(struct kvm *kvm,
>         if (ret)
>                 goto unlock;
>
> +       /*
> +        * For source VM, live migration feature is enabled
> +        * explicitly when the guest is booting, for the
> +        * incoming VM(s) it is implied.
> +        */
> +       sev_update_migration_flags(kvm, KVM_SEV_LIVE_MIGRATION_ENABLED);
> +
>         bitmap_copy(sev->page_enc_bmap + BIT_WORD(gfn_start), bitmap,
>                     (gfn_end - gfn_start));
>
> --
> 2.17.1
>

Reviewed-by: Steve Rutherford <srutherford@...gle.com>