Commit c265878f authored by Paolo Bonzini's avatar Paolo Bonzini
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KVM: x86: document behavior of measurement ioctls with len==0

parent bf1e15a8
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+6 −0
Original line number Diff line number Diff line
@@ -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