linux-kernel - Re: [patch] kvm: sev: Fail KVM_SEV

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Date:   Fri, 11 Jan 2019 14:50:26 +0100
From:   Radim Krčmář <rkrcmar@...hat.com>
To:     David Rientjes <rientjes@...gle.com>
Cc:     Brijesh Singh <brijesh.singh@....com>,
        Joerg Roedel <joro@...tes.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Lendacky <Thomas.Lendacky@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch] kvm: sev: Fail KVM_SEV_INIT if already initialized

2019-01-02 12:56-0800, David Rientjes:
> By code inspection, it was found that multiple calls to KVM_SEV_INIT
> could deplete asid bits and overwrite kvm_sev_info's regions_list.
> 
> Multiple calls to KVM_SVM_INIT is not likely to occur with QEMU, but this
> should likely be fixed anyway.
> 
> This code is serialized by kvm->lock.
> 
> Fixes: 1654efcbc431 ("KVM: SVM: Add KVM_SEV_INIT command")
> Reported-by: Cfir Cohen <cfir@...gle.com>
> Signed-off-by: David Rientjes <rientjes@...gle.com>
> ---

Applied, thanks.