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KVM: x86: document behavior of measurement ioctls with len==0

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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Paolo Bonzini 2021-04-20 04:57:06 -04:00
parent bf1e15a82e
commit c265878fcb
1 changed files with 6 additions and 0 deletions
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6
Documentation/virt/kvm/amd-memory-encryption.rst
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@ -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 boot, the measurement can be verified by comparing it to what the guest owner
expects. 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 Parameters (in): struct kvm_sev_launch_measure
Returns: 0 on success, -negative on error 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 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. 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 Parameters (in): struct kvm_sev_attestation
Returns: 0 on success, -negative on error Returns: 0 on success, -negative on error