summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authormstsirkin <mstsirkin@0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652>2013-09-30 06:03:59 +0000
committermstsirkin <mstsirkin@0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652>2013-09-30 06:03:59 +0000
commitbec2c195f829ff5e7a0e741ca254a2bf8a89fcbb (patch)
tree6692510c1438ffcba3b1df722f26c306932de4ec
parent80a202a93e4388b7abce3ca98aefd48fc23e9d31 (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
-rw-r--r--virtio-v1.0-wd01-part1-specification.txt5
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