diff options
| author | mstsirkin <mstsirkin@0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652> | 2013-09-30 06:03:59 +0000 |
|---|---|---|
| committer | mstsirkin <mstsirkin@0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652> | 2013-09-30 06:03:59 +0000 |
| commit | bec2c195f829ff5e7a0e741ca254a2bf8a89fcbb (patch) | |
| tree | 6692510c1438ffcba3b1df722f26c306932de4ec /virtio-v1.0-wd01-part1-specification.txt | |
| parent | 80a202a93e4388b7abce3ca98aefd48fc23e9d31 (diff) | |
pci: new layout: driver must not write to bits>63
Since we never offer feature bits >63, driver must
not ack them.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
git-svn-id: https://tools.oasis-open.org/version-control/svn/virtio@46 0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652
Diffstat (limited to 'virtio-v1.0-wd01-part1-specification.txt')
| -rw-r--r-- | virtio-v1.0-wd01-part1-specification.txt | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/virtio-v1.0-wd01-part1-specification.txt b/virtio-v1.0-wd01-part1-specification.txt index 1c9df33..f8751ad 100644 --- a/virtio-v1.0-wd01-part1-specification.txt +++ b/virtio-v1.0-wd01-part1-specification.txt @@ -752,8 +752,9 @@ guest_feature_select Selects which Feature Bits does guest_feature field refer to. Value 0x0 selects Feature Bits 0 to 31 Value 0x1 selects Feature Bits 32 to 63 - All other values cause writes to guest_feature to be ignored, - and reads to return 0. + When set to any other value, reads from guest_feature + return 0, writing 0 into guest_feature has no effect, and + writing any other value into guest_feature is an error. guest_feature |