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From:   Jim Mattson <jmattson@google.com>
Date:   Fri, 4 Oct 2019 10:25:40 -0700
Message-ID: <CALMp9eRe8=mJM7rTrn57sWtWVWQOj0Xhwwu=4jpYfh_PDWfAaw@mail.gmail.com>
Subject: Re: [PATCH 1/5] KVM: SVM: Serialize access to the SEV ASID bitmap
To:     "Lendacky, Thomas" <Thomas.Lendacky@amd.com>
Cc:     "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Paolo Bonzini <pbonzini@redhat.com>,
        =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= <rkrcmar@redhat.com>,
        Sean Christopherson <sean.j.christopherson@intel.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Joerg Roedel <joro@8bytes.org>,
        "Singh, Brijesh" <brijesh.singh@amd.com>,
        David Rientjes <rientjes@google.com>
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On Thu, Oct 3, 2019 at 2:17 PM Lendacky, Thomas <Thomas.Lendacky@amd.com> wrote:
>
> From: Tom Lendacky <thomas.lendacky@amd.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@google.com>
> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: Jim Mattson <jmattson@google.com>