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Subject: [PATCH RFC v7 7/8] admin: document that structures can be shorter or longer
ensures forward and backward compatibility as long as we tuck new structures at the end. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> --- admin.tex | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/admin.tex b/admin.tex index a0008c7..99b6c2a 100644 --- a/admin.tex +++ b/admin.tex @@ -136,6 +136,12 @@ \subsection{Group administration commands}\label{sec:Basic Facilities of a Virti holds the command specific error. If \field{status} is not set to VIRTIO_ADMIN_STATUS_CS_ERR, the \field{command_specific_error} value is undefined and should be ignored by the driver. +It is legal for the driver to submit commands with device-writeable and +device-readable structures both shorter and longer than what +is described in this specification. Device silently truncates the +structures to the shorter of the two (submitted by driver and +described in this specification). + \section{Administration Virtqueue}\label{sec:Basic Facilities of a Virtio Device / Group Administration Virtqueues} An administration virtqueue of a parent device is used to submit -- MST
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