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# Date Author Comment
a697a334 09/07/2010 08:29 pm Alex Williamson

virtio-net: Introduce a new bottom half packet TX

Based on a patch from Mark McLoughlin, this patch introduces a new
bottom half packet transmitter that avoids the latency imposed by
the tx_timer approach. Rather than scheduling a timer when a TX
packet comes in, schedule a bottom half to be run from the iothread....
e3f30488 09/07/2010 08:29 pm Alex Williamson

virtio-net: Limit number of packets sent per TX flush

If virtio_net_flush_tx() is called with notification disabled, we can
race with the guest, processing packets at the same rate as they
get produced. The trouble is that this means we have no guaranteed...
f0c07c7c 09/07/2010 08:29 pm Alex Williamson

virtio-net: Make tx_timer timeout configurable

Add an option to make the TX mitigation timer adjustable as a device
option. The 150us hard coded default used currently is reasonable,
but may not be suitable for all workloads, this gives us a way to
adjust it using a single binary. We can't support any random option...
baf0b55a 04/09/2010 11:06 pm Alexander Graf

Implement virtio reset

The guest may issue a RESET command for virtio. So far we didn't bother
to implement it, but with my new bootloader we actually need it for Linux
to get back to a safe state.

Signed-off-by: Alexander Graf <>
Signed-off-by: Aurelien Jarno <>
3e607cb5 04/01/2010 09:56 pm Michael S. Tsirkin

virtio: add set_status callback

vhost net backend needs to be notified when
frontend status changes. Add a callback,
similar to set_features.

Signed-off-by: Michael S. Tsirkin <>
Signed-off-by: Anthony Liguori <>
ad509737 03/06/2010 11:55 pm Amit Shah

s390-virtio: Fix compile error for virtio-block init

Commit 428c149b0be790b440e1cbee185b152cdb22feec modified the argument
that virtio_blk_init takes. Update the s390 bus code that calls this
function.

Signed-off-by: Amit Shah <>
CC: Christoph Hellwig <>...
428c149b 02/11/2010 12:53 am Christoph Hellwig

block: add topology qdev properties

Add three new qdev properties to export block topology information to
the guest. This is needed to get optimal I/O alignment for RAID arrays
or SSDs.

The options are:

- physical_block_size to specify the physical block size of the device,...
98b19252 01/20/2010 04:25 pm Amit Shah

virtio-console: qdev conversion, new virtio-serial-bus

This commit converts the virtio-console device to create a new
virtio-serial bus that can host console and generic serial ports. The
file hosting this code is now called virtio-serial-bus.c.

The virtio console is now a very simple qdev device that sits on the...
704a76fc 01/11/2010 09:40 pm Michael S. Tsirkin

virtio: rename features -> guest_features

Rename features->guest_features. This is
what they are, avoid confusion with
host features which we also need to keep around.

Signed-off-by: Michael S. Tsirkin <>
Signed-off-by: Anthony Liguori <>
8172539d 01/11/2010 09:40 pm Michael S. Tsirkin

virtio: add features as qdev properties

Add feature bits as properties to virtio. This makes it possible to e.g. define
machine without indirect buffer support, which is required for 0.10
compatibility, or without hardware checksum support, which is required for 0.11...
86f3dba6 12/18/2009 05:34 pm Alexander Graf

S390: Don't tell guest we're updating config space

Currently we always set the "config space changed" bit to 1 when triggering
any virtio interrupt. While that worked in 2.6.27, newer kernels interpret
that value as "only the config space changed and nothing else happened"....
f3304eea 12/05/2009 06:36 pm Alexander Graf

Add S390x virtio machine bus

On S390x we don't want to go through the hassle of emulating real existing
hardware, because we don't need to for running Linux.

So let's instead implement a machine that is 100% based on VirtIO which we
fortunately implement already....