linux-kernel - Re: [PATCH 1/2] KVM: SEV: Pin guest memory for write for RECEIVE_UPDATE

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Message-ID: <1bd21635-a198-327f-cca1-7fd8bc116c91@amd.com>
Date:   Tue, 14 Sep 2021 17:15:06 -0500
From:   Brijesh Singh <brijesh.singh@....com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     brijesh.singh@....com, Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Peter Gonda <pgonda@...gle.com>,
        Marc Orr <marcorr@...gle.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Masahiro Kozuka <masa.koz@...uka.jp>
Subject: Re: [PATCH 1/2] KVM: SEV: Pin guest memory for write for
 RECEIVE_UPDATE_DATA



On 9/14/21 4:09 PM, Sean Christopherson wrote:
> Require the target guest page to be writable when pinning memory for
> RECEIVE_UPDATE_DATA.  Per the SEV API, the PSP writes to guest memory:
> 
>    The result is then encrypted with GCTX.VEK and written to the memory
>    pointed to by GUEST_PADDR field.
> 
> Fixes: 15fb7de1a7f5 ("KVM: SVM: Add KVM_SEV_RECEIVE_UPDATE_DATA command")
> Cc: stable@...r.kernel.org
> Cc: Peter Gonda <pgonda@...gle.com>
> Cc: Marc Orr <marcorr@...gle.com>
> Cc: Tom Lendacky <thomas.lendacky@....com>
> Cc: Brijesh Singh <brijesh.singh@....com>
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>

Reviewed-by: Brijesh Singh <brijesh.singh@....com>

thanks