diff options
| author | Tiwei Bie <tiwei.bie@intel.com> | 2018-06-11 15:56:40 +0800 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2018-10-19 17:48:27 -0400 |
| commit | 13671b99849eb157543e34ddd41bd239f2a0437c (patch) | |
| tree | 7d742f822e38e8484062b3134f4f879ab1b30b6b | |
| parent | a6ab4ebf64cf897ffebf9bf4305d137affef3d5c (diff) | |
| download | virtio-spec-13671b99849eb157543e34ddd41bd239f2a0437c.tar.gz | |
content: enhance device requirements for feature bits
Suggested-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Fixes: https://github.com/oasis-tcs/virtio-spec/issues/14
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
| -rw-r--r-- | content.tex | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/content.tex b/content.tex index 4bf5b1e..4c98774 100644 --- a/content.tex +++ b/content.tex @@ -127,6 +127,13 @@ which was not offered. The device SHOULD accept any valid subset of features the driver accepts, otherwise it MUST fail to set the FEATURES_OK \field{device status} bit when the driver writes it. +If a device has successfully negotiated a set of features +at least once (by accepting the FEATURES_OK \field{device +status} bit during device initialization), then it SHOULD +NOT fail re-negotiation of the same set of features after +a device or system reset. Failure to do so would interfere +with resuming from suspend and error recovery. + \subsection{Legacy Interface: A Note on Feature Bits}\label{sec:Basic Facilities of a Virtio Device / Feature Bits / Legacy Interface: A Note on Feature Bits} |