On 12/03/2009 10:42 AM, Avishay Traeger1 wrote:
I previously submitted a patch to have the guest virtio-blk driver get the
value for the maximum I/O size from the host bdrv, rather than assume that
there is no limit. Avi requested that I first patch the virtio spec
(http://ozlabs.org/~rusty/virtio-spec/). Below is that patch.
Please CC me on replies, as I am not subscribed.
Copying Rusty and virtualizat...@.
Thank you,
Avishay
Signed-off-by: Avishay Traeger<avis...@il.ibm.com>
--- virtio-spec-0.8.2.lyx 2009-11-30 16:34:16.000000000 +0200
+++ virtio-spec-0.8.2-mod.lyx 2009-12-01 16:04:36.000000000 +0200
@@ -3999,6 +3999,20 @@
\end_inset
.
+\change_inserted 0 1259672174
+
+\end_layout
+
+\begin_layout Description
+
+\change_inserted 0 1259672252
+VIRTIO_BLK_F_SECTOR_MAX
+\begin_inset space ~
+\end_inset
+
+(10) Maximum sectors in an I/O.
+\change_unchanged
+
\end_layout
\end_deeper
@@ -4068,6 +4082,17 @@
\begin_layout Plain Layout
u32 blk_size;
+\change_inserted 0 1259672274
+
+\end_layout
+
+\begin_layout Plain Layout
+
+\change_inserted 0 1259672305
+
+ u32 sectors_max;
+\change_unchanged
+
\end_layout
\begin_layout Plain Layout
@@ -4107,6 +4132,18 @@
\begin_layout Enumerate
If the VIRTIO_BLK_F_RO feature is set by the device, any write requests
will fail.
+\change_inserted 0 1259672345
+
+\end_layout
+
+\begin_layout Enumerate
+
+\change_inserted 0 1259672454
+If the VIRTIO_BLK_F_SECTOR_MAX feature is negotiated, the sectors_max
field
+ should be read to determine the maximum I/O size for the driver to use.
+ No requests should be submitted which go beyond this limit.
+\change_unchanged
+
\end_layout
\begin_layout Section*
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--
error compiling committee.c: too many arguments to function
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