linux-kernel - Re: [PATCH 1/5] KVM: SVM: Serialize access to the SEV ASID bitmap

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Message-ID: <CALMp9eRe8=mJM7rTrn57sWtWVWQOj0Xhwwu=4jpYfh_PDWfAaw@mail.gmail.com>
Date:   Fri, 4 Oct 2019 10:25:40 -0700
From:   Jim Mattson <jmattson@...gle.com>
To:     "Lendacky, Thomas" <Thomas.Lendacky@....com>
Cc:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Joerg Roedel <joro@...tes.org>,
        "Singh, Brijesh" <brijesh.singh@....com>,
        David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH 1/5] KVM: SVM: Serialize access to the SEV ASID bitmap

On Thu, Oct 3, 2019 at 2:17 PM Lendacky, Thomas <Thomas.Lendacky@....com> wrote:
>
> From: Tom Lendacky <thomas.lendacky@....com>
>
> The SEV ASID bitmap currently is not protected against parallel SEV guest
> startups. This can result in an SEV guest failing to start because another
> SEV guest could have been assigned the same ASID value. Use a mutex to
> serialize access to the SEV ASID bitmap.
>
> Fixes: 1654efcbc431 ("KVM: SVM: Add KVM_SEV_INIT command")
> Tested-by: David Rientjes <rientjes@...gle.com>
> Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
Reviewed-by: Jim Mattson <jmattson@...gle.com>