diff mbox series

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

Message ID 20210420093411.1498840-1-pbonzini@redhat.com (mailing list archive)
State New
Headers show
Series KVM: x86: document behavior of measurement ioctls with len==0 | expand

Commit Message

Paolo Bonzini April 20, 2021, 9:34 a.m. UTC
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 Documentation/virt/kvm/amd-memory-encryption.rst | 6 ++++++
 1 file changed, 6 insertions(+)

Comments

Brijesh Singh April 20, 2021, 7:09 p.m. UTC | #1
On 4/20/21 4:34 AM, Paolo Bonzini wrote:
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>


Reviewed-by: Brijesh Singh <brijesh.singh@amd.com>

Thanks

> ---
>  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
diff mbox series

Patch

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