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authorrusty <rusty@0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652>2013-08-16 03:20:05 +0000
committerrusty <rusty@0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652>2013-08-16 03:20:05 +0000
commit69fbbac976180a38519d2319c7927ec09b746119 (patch)
tree0c95ded98c6500f27e225d9ddc868749ee738025 /virtio-spec.txt
parent4a831c11b67ca68e2009408b1c90b7b504213040 (diff)
2.6 Reserved Feature Bits: document bit 30 as used by qemu.
Partial port of draft commit 835628846cc04efe660e505552d06eb945277d3b. Signed-off-by: Rusty Russell <rusty@au1.ibm.com> git-svn-id: https://tools.oasis-open.org/version-control/svn/virtio@13 0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652
Diffstat (limited to 'virtio-spec.txt')
-rw-r--r--virtio-spec.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/virtio-spec.txt b/virtio-spec.txt
index f7c80ec..d762461 100644
--- a/virtio-spec.txt
+++ b/virtio-spec.txt
@@ -2502,6 +2502,10 @@ Currently there are four device-independent feature bits defined:
ignore the avail_event field; the flags field is used
+In addition, bit 30 is used by qemu's implementation to check for experimental
+early versions of virtio which did not perform correct feature negotiation,
+and should not be used.
+
2.7 virtio_ring.h
=================