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Message-Id: <20210420093411.1498840-1-pbonzini@redhat.com> Date: Tue, 20 Apr 2021 05:34:11 -0400 From: Paolo Bonzini <pbonzini@...hat.com> To: linux-kernel@...r.kernel.org, kvm@...r.kernel.org Cc: Brijesh Singh <brijesh.singh@....com> Subject: [PATCH] KVM: x86: document behavior of measurement ioctls with len==0 Signed-off-by: Paolo Bonzini <pbonzini@...hat.com> --- Documentation/virt/kvm/amd-memory-encryption.rst | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Documentation/virt/kvm/amd-memory-encryption.rst b/Documentation/virt/kvm/amd-memory-encryption.rst index 469a6308765b..34ce2d1fcb89 100644 --- a/Documentation/virt/kvm/amd-memory-encryption.rst +++ b/Documentation/virt/kvm/amd-memory-encryption.rst @@ -148,6 +148,9 @@ measurement. Since the guest owner knows the initial contents of the guest at boot, the measurement can be verified by comparing it to what the guest owner expects. +If len is zero on entry, the measurement blob length is written to len and +uaddr is unused. + Parameters (in): struct kvm_sev_launch_measure Returns: 0 on success, -negative on error @@ -271,6 +274,9 @@ report containing the SHA-256 digest of the guest memory and VMSA passed through commands and signed with the PEK. The digest returned by the command should match the digest used by the guest owner with the KVM_SEV_LAUNCH_MEASURE. +If len is zero on entry, the measurement blob length is written to len and +uaddr is unused. + Parameters (in): struct kvm_sev_attestation Returns: 0 on success, -negative on error -- 2.26.2
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