Hi all,
Back in May we talked about efficiently connecting a user-space Ethernet
switch to QEMU guests. Stefan Hajnoczi sketched the design of a userspace
version of vhost that uses a Unix socket for its control interface. His
design is in the mail quoted below.
I'd like to ask you: if this
On Wed, May 29, 2013 at 6:02 PM, Julian Stecklina
jstec...@os.inf.tu-dresden.de wrote:
On 05/29/2013 04:21 PM, Stefan Hajnoczi wrote:
The fact that a single switch process has shared memory access to all
guests' RAM is critical. If the switch process is exploited, then that
exposes other
On Thu, May 30, 2013 at 08:46:42AM +0200, Stefan Hajnoczi wrote:
On Wed, May 29, 2013 at 6:02 PM, Julian Stecklina
jstec...@os.inf.tu-dresden.de wrote:
On 05/29/2013 04:21 PM, Stefan Hajnoczi wrote:
The fact that a single switch process has shared memory access to all
guests' RAM is
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On 05/30/2013 08:46 AM, Stefan Hajnoczi wrote:
On Wed, May 29, 2013 at 6:02 PM, Julian Stecklina
jstec...@os.inf.tu-dresden.de wrote:
On 05/29/2013 04:21 PM, Stefan Hajnoczi wrote:
The fact that a single switch process has shared memory access
On Tue, May 28, 2013 at 08:17:42PM +0300, Michael S. Tsirkin wrote:
On Tue, May 28, 2013 at 12:00:38PM -0500, Anthony Liguori wrote:
Julian Stecklina jstec...@os.inf.tu-dresden.de writes:
On 05/28/2013 12:10 PM, Luke Gorrie wrote:
On 27 May 2013 11:34, Stefan Hajnoczi
On Wed, May 29, 2013 at 09:49:29AM +0200, Stefan Hajnoczi wrote:
On Tue, May 28, 2013 at 08:17:42PM +0300, Michael S. Tsirkin wrote:
On Tue, May 28, 2013 at 12:00:38PM -0500, Anthony Liguori wrote:
Julian Stecklina jstec...@os.inf.tu-dresden.de writes:
On 05/28/2013 12:10 PM, Luke
On Tue, 28 May 2013, Anthony Liguori wrote:
Michael S. Tsirkin m...@redhat.com writes:
On Tue, May 28, 2013 at 12:00:38PM -0500, Anthony Liguori wrote:
Julian Stecklina jstec...@os.inf.tu-dresden.de writes:
I don't see any compelling reason to do something like this. It's
jumping
On Wed, May 29, 2013 at 11:31:50AM +0100, Stefano Stabellini wrote:
On Tue, 28 May 2013, Anthony Liguori wrote:
Michael S. Tsirkin m...@redhat.com writes:
On Tue, May 28, 2013 at 12:00:38PM -0500, Anthony Liguori wrote:
Julian Stecklina jstec...@os.inf.tu-dresden.de writes:
On Wed, 29 May 2013, Michael S. Tsirkin wrote:
On Wed, May 29, 2013 at 11:31:50AM +0100, Stefano Stabellini wrote:
On Tue, 28 May 2013, Anthony Liguori wrote:
Michael S. Tsirkin m...@redhat.com writes:
On Tue, May 28, 2013 at 12:00:38PM -0500, Anthony Liguori wrote:
Julian
On 05/28/2013 07:00 PM, Anthony Liguori wrote:
We aren't going to support any interface that enables out of tree
devices. This is just plugins in a different form with even more
downsides. You cannot easily keep track of dirty info, the guest
physical address translation to host is difficult
On Wed, May 29, 2013 at 12:08:59PM +0300, Michael S. Tsirkin wrote:
On Wed, May 29, 2013 at 09:49:29AM +0200, Stefan Hajnoczi wrote:
On Tue, May 28, 2013 at 08:17:42PM +0300, Michael S. Tsirkin wrote:
On Tue, May 28, 2013 at 12:00:38PM -0500, Anthony Liguori wrote:
Julian Stecklina
On Wed, May 29, 2013 at 02:32:50PM +0200, Julian Stecklina wrote:
On 05/28/2013 07:00 PM, Anthony Liguori wrote:
We aren't going to support any interface that enables out of tree
devices. This is just plugins in a different form with even more
downsides. You cannot easily keep track of
On Wed, May 29, 2013 at 04:21:43PM +0200, Stefan Hajnoczi wrote:
On Wed, May 29, 2013 at 12:08:59PM +0300, Michael S. Tsirkin wrote:
On Wed, May 29, 2013 at 09:49:29AM +0200, Stefan Hajnoczi wrote:
On Tue, May 28, 2013 at 08:17:42PM +0300, Michael S. Tsirkin wrote:
On Tue, May 28, 2013
On 05/29/2013 04:31 PM, Stefan Hajnoczi wrote:
On Wed, May 29, 2013 at 02:32:50PM +0200, Julian Stecklina wrote:
On 05/28/2013 07:00 PM, Anthony Liguori wrote:
We aren't going to support any interface that enables out of tree
devices. This is just plugins in a different form with even more
On 05/29/2013 04:21 PM, Stefan Hajnoczi wrote:
The fact that a single switch process has shared memory access to all
guests' RAM is critical. If the switch process is exploited, then that
exposes other guests' data! (Think of a multi-tenant host with guests
belonging to different users.)
Julian,
Stefan's concerns are valid.
(Hopefully, kernel is harder to exploit and more carefully audited.)
On Wed, May 29, 2013 at 9:02 AM, Julian Stecklina
jstec...@os.inf.tu-dresden.de wrote:
On 05/29/2013 04:21 PM, Stefan Hajnoczi wrote:
The fact that a single switch process has shared
On 27 May 2013 11:34, Stefan Hajnoczi stefa...@redhat.com wrote:
vhost_net is about connecting the a virtio-net speaking process to a
tun-like device. The problem you are trying to solve is connecting a
virtio-net speaking process to Snabb Switch.
Yep!
Either you need to replace vhost or
On Tue, May 28, 2013 at 12:10 PM, Luke Gorrie luk...@gmail.com wrote:
On 27 May 2013 11:34, Stefan Hajnoczi stefa...@redhat.com wrote:
vhost_net is about connecting the a virtio-net speaking process to a
tun-like device. The problem you are trying to solve is connecting a
virtio-net speaking
Hi Anthony,
On 27 May 2013 18:18, Anthony Liguori anth...@codemonkey.ws wrote:
It would be very interesting to combine this with vmsplice/splice.
Good point. This kernel-centric approach is a very promising one, though
not the design we are exploring in the Snabb Switch project.
Snabb Switch
On 05/28/2013 12:10 PM, Luke Gorrie wrote:
On 27 May 2013 11:34, Stefan Hajnoczi stefa...@redhat.com
mailto:stefa...@redhat.com wrote:
vhost_net is about connecting the a virtio-net speaking process to a
tun-like device. The problem you are trying to solve is connecting a
On Tue, May 28, 2013 at 01:36:36PM +0200, Julian Stecklina wrote:
On 05/28/2013 12:10 PM, Luke Gorrie wrote:
On 27 May 2013 11:34, Stefan Hajnoczi stefa...@redhat.com
mailto:stefa...@redhat.com wrote:
vhost_net is about connecting the a virtio-net speaking process to a
tun-like
On Tue, May 28, 2013 at 12:10:50PM +0200, Luke Gorrie wrote:
On 27 May 2013 11:34, Stefan Hajnoczi stefa...@redhat.com wrote:
vhost_net is about connecting the a virtio-net speaking process to a
tun-like device. The problem you are trying to solve is connecting a
virtio-net speaking
On 05/28/2013 01:53 PM, Michael S. Tsirkin wrote:
Implementing out of process device logic would absolutely be useful for
qemu, for security.
Don't expect it to be zero overhead though, latency overhead
of bouncing each packet through multiple processes would
be especially painful.
On Tue, May 28, 2013 at 02:09:21PM +0200, Julian Stecklina wrote:
On 05/28/2013 01:53 PM, Michael S. Tsirkin wrote:
Implementing out of process device logic would absolutely be useful for
qemu, for security.
Don't expect it to be zero overhead though, latency overhead
of bouncing each
On 05/28/2013 03:56 PM, Michael S. Tsirkin wrote:
and in fact that was how vhost worked originally.
There were some issues to be fixed before it worked
without issues, but we do plan to go back to that I think.
Do you know why they abandoned this execution model?
Julian
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On Tue, May 28, 2013 at 05:35:55PM +0200, Julian Stecklina wrote:
On 05/28/2013 03:56 PM, Michael S. Tsirkin wrote:
and in fact that was how vhost worked originally.
There were some issues to be fixed before it worked
without issues, but we do plan to go back to that I think.
Do you know
Julian Stecklina jstec...@os.inf.tu-dresden.de writes:
On 05/28/2013 12:10 PM, Luke Gorrie wrote:
On 27 May 2013 11:34, Stefan Hajnoczi stefa...@redhat.com
mailto:stefa...@redhat.com wrote:
vhost_net is about connecting the a virtio-net speaking process to a
tun-like device. The
On Tue, May 28, 2013 at 12:00:38PM -0500, Anthony Liguori wrote:
Julian Stecklina jstec...@os.inf.tu-dresden.de writes:
On 05/28/2013 12:10 PM, Luke Gorrie wrote:
On 27 May 2013 11:34, Stefan Hajnoczi stefa...@redhat.com
mailto:stefa...@redhat.com wrote:
vhost_net is about
Michael S. Tsirkin m...@redhat.com writes:
On Tue, May 28, 2013 at 12:00:38PM -0500, Anthony Liguori wrote:
Julian Stecklina jstec...@os.inf.tu-dresden.de writes:
I don't see any compelling reason to do something like this. It's
jumping through a tremendous number of hoops to avoid
On Sun, May 26, 2013 at 11:32:49AM +0200, Luke Gorrie wrote:
Stefan put us onto the highly promising track of vhost/virtio. We have
implemented this between Snabb Switch and the Linux kernel, but not
directly between Snabb Switch and QEMU guests. The roadblock we have hit
is embarrasingly
On Mon, May 27, 2013 at 11:34:09AM +0200, Stefan Hajnoczi wrote:
On Sun, May 26, 2013 at 11:32:49AM +0200, Luke Gorrie wrote:
Stefan put us onto the highly promising track of vhost/virtio. We have
implemented this between Snabb Switch and the Linux kernel, but not
directly between Snabb
Il 27/05/2013 11:34, Stefan Hajnoczi ha scritto:
On Sun, May 26, 2013 at 11:32:49AM +0200, Luke Gorrie wrote:
Stefan put us onto the highly promising track of vhost/virtio. We have
implemented this between Snabb Switch and the Linux kernel, but not
directly between Snabb Switch and QEMU
Paolo Bonzini pbonz...@redhat.com writes:
Il 27/05/2013 11:34, Stefan Hajnoczi ha scritto:
On Sun, May 26, 2013 at 11:32:49AM +0200, Luke Gorrie wrote:
Stefan put us onto the highly promising track of vhost/virtio. We have
implemented this between Snabb Switch and the Linux kernel, but not
Il 27/05/2013 18:18, Anthony Liguori ha scritto:
Paolo Bonzini pbonz...@redhat.com writes:
Il 27/05/2013 11:34, Stefan Hajnoczi ha scritto:
On Sun, May 26, 2013 at 11:32:49AM +0200, Luke Gorrie wrote:
Stefan put us onto the highly promising track of vhost/virtio. We have
implemented this
Paolo Bonzini pbonz...@redhat.com writes:
Il 27/05/2013 18:18, Anthony Liguori ha scritto:
Paolo Bonzini pbonz...@redhat.com writes:
Il 27/05/2013 11:34, Stefan Hajnoczi ha scritto:
On Sun, May 26, 2013 at 11:32:49AM +0200, Luke Gorrie wrote:
Stefan put us onto the highly promising track
On Mon, May 27, 2013 at 12:01:07PM -0500, Anthony Liguori wrote:
Paolo Bonzini pbonz...@redhat.com writes:
Il 27/05/2013 18:18, Anthony Liguori ha scritto:
Paolo Bonzini pbonz...@redhat.com writes:
Il 27/05/2013 11:34, Stefan Hajnoczi ha scritto:
On Sun, May 26, 2013 at 11:32:49AM
On Mon, May 27, 2013 at 12:13 PM, Michael S. Tsirkin m...@redhat.com wrote:
On Mon, May 27, 2013 at 12:01:07PM -0500, Anthony Liguori wrote:
Paolo Bonzini pbonz...@redhat.com writes:
Finally, the destination QEMU process can vmsplice() from the pipe which
will copy the data (this is the
Dear qemu-devel hackers,
I am writing to ask for some technical advice. I am making embarrassingly
slow progress on finding a good way to integrate the Snabb Switch
user-space ethernet switch (http://snabb.co/snabbswitch/) with QEMU for
efficient ethernet I/O.
Stefan put us onto the highly
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