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KVM: x86: document behavior of measurement ioctls with len==0
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -148,6 +148,9 @@ measurement. Since the guest owner knows the initial contents of the guest at
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boot, the measurement can be verified by comparing it to what the guest owner
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expects.
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If len is zero on entry, the measurement blob length is written to len and
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uaddr is unused.
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Parameters (in): struct kvm_sev_launch_measure
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Returns: 0 on success, -negative on error
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@ -271,6 +274,9 @@ report containing the SHA-256 digest of the guest memory and VMSA passed through
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commands and signed with the PEK. The digest returned by the command should match the digest
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used by the guest owner with the KVM_SEV_LAUNCH_MEASURE.
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If len is zero on entry, the measurement blob length is written to len and
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uaddr is unused.
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Parameters (in): struct kvm_sev_attestation
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Returns: 0 on success, -negative on error
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