linux-kernel - [PATCH 0/2] KVM: SEV: RECEIVE_UPDATE

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Date:   Tue, 14 Sep 2021 14:09:49 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.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>,
        Brijesh Singh <brijesh.singh@....com>,
        Masahiro Kozuka <masa.koz@...uka.jp>
Subject: [PATCH 0/2] KVM: SEV: RECEIVE_UPDATE_DATA bug fixes

Patch 1 pins the target of RECEIVE_UPDATE_DATA for write instead of read.
The SEV API clearly states that the PSP writes guest memory, which makes
sense given that the guest is receiving data.

Patch 2 adds a CLFLUSH of the guest memory as there is no requirement
that the page already be in an encrypted state before RECEIVE_UPDATE_DATA,
i.e. the cache may have dirty, unencrypted data.

On my end, these patches are compile-tested only as I don't have a
userspace VMM that supports SEV live migration, nor are there tests for
any of this stuff.

Masahiro Kozuka (1):
  KVM: SEV: Flush cache on non-coherent systems before
    RECEIVE_UPDATE_DATA

Sean Christopherson (1):
  KVM: SEV: Pin guest memory for write for RECEIVE_UPDATE_DATA

 arch/x86/kvm/svm/sev.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

-- 
2.33.0.309.g3052b89438-goog