Here is v2.
Changelog:
v1->v2
The major change from v1 is I've added the in-kernel MSI-X mask emulation
support, as well as adding shortcuts for reading MSI-X table.
I've taken Michael's advice to use mask/unmask directly, but unsure about
exporting irq_to_desc() for module...
Also add flush_w
On 10/20/2010 10:26 AM, Sheng Yang wrote:
Here is v2.
Changelog:
v1->v2
The major change from v1 is I've added the in-kernel MSI-X mask emulation
support, as well as adding shortcuts for reading MSI-X table.
I've taken Michael's advice to use mask/unmask directly, but unsure about
exporting
On Wed, Oct 20, 2010 at 11:51:01AM +0200, Avi Kivity wrote:
> On 10/20/2010 10:26 AM, Sheng Yang wrote:
> >Here is v2.
> >
> >Changelog:
> >
> >v1->v2
> >
> >The major change from v1 is I've added the in-kernel MSI-X mask emulation
> >support, as well as adding shortcuts for reading MSI-X table.
>
On 10/20/2010 12:44 PM, Michael S. Tsirkin wrote:
>
> Any performance numbers? What are the affected guests? just RHEL
> 4, or any others?
Likely any old linux.
I meant that people are likely to virtualize and expect high performance
from.
What about RHEL 3? Does it support msi? How
On Wed, Oct 20, 2010 at 12:59:42PM +0200, Avi Kivity wrote:
> On 10/20/2010 12:44 PM, Michael S. Tsirkin wrote:
> >>
> >> Any performance numbers? What are the affected guests? just RHEL
> >> 4, or any others?
> >
> >Likely any old linux.
>
> I meant that people are likely to virtualize and e
On Wed, 2010-10-20 at 12:44 +0200, Michael S. Tsirkin wrote:
> On Wed, Oct 20, 2010 at 11:51:01AM +0200, Avi Kivity wrote:
> > On 10/20/2010 10:26 AM, Sheng Yang wrote:
> > >Here is v2.
> > >
> > >Changelog:
> > >
> > >v1->v2
> > >
> > >The major change from v1 is I've added the in-kernel MSI-X ma
On Wed, Oct 20, 2010 at 08:47:14AM -0600, Alex Williamson wrote:
> On Wed, 2010-10-20 at 12:44 +0200, Michael S. Tsirkin wrote:
> > On Wed, Oct 20, 2010 at 11:51:01AM +0200, Avi Kivity wrote:
> > > On 10/20/2010 10:26 AM, Sheng Yang wrote:
> > > >Here is v2.
> > > >
> > > >Changelog:
> > > >
> > >
On Wed, 2010-10-20 at 15:43 +0200, Michael S. Tsirkin wrote:
> On Wed, Oct 20, 2010 at 12:59:42PM +0200, Avi Kivity wrote:
> > How far away is vfio? If it's merged soon, we might avoid making
> > changes to the old assigned device infrastructure and instead update
> > vfio.
>
> Hard to be sure, h
On Wed, Oct 20, 2010 at 08:58:38AM -0600, Alex Williamson wrote:
> On Wed, 2010-10-20 at 15:43 +0200, Michael S. Tsirkin wrote:
> > On Wed, Oct 20, 2010 at 12:59:42PM +0200, Avi Kivity wrote:
> > > How far away is vfio? If it's merged soon, we might avoid making
> > > changes to the old assigned d
On Wed, 2010-10-20 at 16:46 +0200, Michael S. Tsirkin wrote:
> On Wed, Oct 20, 2010 at 08:47:14AM -0600, Alex Williamson wrote:
> > On Wed, 2010-10-20 at 12:44 +0200, Michael S. Tsirkin wrote:
> > > On Wed, Oct 20, 2010 at 11:51:01AM +0200, Avi Kivity wrote:
> > > > On 10/20/2010 10:26 AM, Sheng Y
On Wed, 2010-10-20 at 16:58 +0200, Michael S. Tsirkin wrote:
> On Wed, Oct 20, 2010 at 08:58:38AM -0600, Alex Williamson wrote:
> > On Wed, 2010-10-20 at 15:43 +0200, Michael S. Tsirkin wrote:
> > > On Wed, Oct 20, 2010 at 12:59:42PM +0200, Avi Kivity wrote:
> > > > How far away is vfio? If it's m
On 10/20/2010 03:43 PM, Michael S. Tsirkin wrote:
> >If instead of eventfd we had a file descriptor that can pass vector
> >information from vfio to kvm and back, that would fix it,
> >as we would not need to set us GSIs at all,
> >and not need for userspace to handle MSIX specially.
> >
>
On Wed, Oct 20, 2010 at 09:07:12AM -0600, Alex Williamson wrote:
> On Wed, 2010-10-20 at 16:46 +0200, Michael S. Tsirkin wrote:
> > On Wed, Oct 20, 2010 at 08:47:14AM -0600, Alex Williamson wrote:
> > > On Wed, 2010-10-20 at 12:44 +0200, Michael S. Tsirkin wrote:
> > > > On Wed, Oct 20, 2010 at 11:
On Wed, 2010-10-20 at 17:17 +0200, Avi Kivity wrote:
> On 10/20/2010 03:43 PM, Michael S. Tsirkin wrote:
> > > >If instead of eventfd we had a file descriptor that can pass vector
> > > >information from vfio to kvm and back, that would fix it,
> > > >as we would not need to set us GSIs at all,
On 10/20/2010 04:47 PM, Alex Williamson wrote:
>
> With current VFIO we would catch mask writes in qemu and
> call a KVM ioctl. We would also need an ioctl to retrieve
> pending bits long term.
Ugh, no. VFIO us currently independent of KVM. I'd like to keep it
that way.
Me, too. Perhaps
On 10/20/2010 05:22 PM, Alex Williamson wrote:
On Wed, 2010-10-20 at 17:17 +0200, Avi Kivity wrote:
> On 10/20/2010 03:43 PM, Michael S. Tsirkin wrote:
> > > >If instead of eventfd we had a file descriptor that can pass vector
> > > >information from vfio to kvm and back, that would fix
On Wed, 2010-10-20 at 17:26 +0200, Avi Kivity wrote:
> On 10/20/2010 05:22 PM, Alex Williamson wrote:
> > On Wed, 2010-10-20 at 17:17 +0200, Avi Kivity wrote:
> > > On 10/20/2010 03:43 PM, Michael S. Tsirkin wrote:
> > > > > >If instead of eventfd we had a file descriptor that can pass
> > >
On Wed, 2010-10-20 at 17:23 +0200, Avi Kivity wrote:
> On 10/20/2010 04:47 PM, Alex Williamson wrote:
> > >
> > > With current VFIO we would catch mask writes in qemu and
> > > call a KVM ioctl. We would also need an ioctl to retrieve
> > > pending bits long term.
> >
> > Ugh, no. VFIO us curre
On 10/20/2010 05:38 PM, Alex Williamson wrote:
> > We'll need to optimize interrupt injection and eoi via KVM,
> > but it should only be a performance optimization, not a functional
> > requirement.
>
> For level-triggered interrupts only, yes? MSI EOI does not involve any
> device or i
On Wed, Oct 20, 2010 at 05:54:20PM +0200, Avi Kivity wrote:
> On 10/20/2010 05:38 PM, Alex Williamson wrote:
> >> > We'll need to optimize interrupt injection and eoi via KVM,
> >> > but it should only be a performance optimization, not a functional
> >> > requirement.
> >>
> >> For level-t
On 10/20/2010 05:59 PM, Michael S. Tsirkin wrote:
>
> One ugly way is to use two eventfds, one counting mask events, one
> counting unmask events. The difference is the value if the masked
> bit.
>
> Another option is to use
> http://permalink.gmane.org/gmane.linux.kernel.commits.head/1880
On Wed, Oct 20, 2010 at 06:13:53PM +0200, Avi Kivity wrote:
> On 10/20/2010 05:59 PM, Michael S. Tsirkin wrote:
> >>
> >> One ugly way is to use two eventfds, one counting mask events, one
> >> counting unmask events. The difference is the value if the masked
> >> bit.
> >>
> >> Another optio
On Wed, 2010-10-20 at 17:59 +0200, Michael S. Tsirkin wrote:
> On Wed, Oct 20, 2010 at 05:54:20PM +0200, Avi Kivity wrote:
> > On 10/20/2010 05:38 PM, Alex Williamson wrote:
> > >> > We'll need to optimize interrupt injection and eoi via KVM,
> > >> > but it should only be a performance optimi
On Wed, Oct 20, 2010 at 04:26:24PM +0800, Sheng Yang wrote:
> Here is v2.
>
> Changelog:
>
> v1->v2
>
> The major change from v1 is I've added the in-kernel MSI-X mask emulation
> support, as well as adding shortcuts for reading MSI-X table.
>
> I've taken Michael's advice to use mask/unmask di
On Wed, 2010-10-20 at 17:13 +0200, Michael S. Tsirkin wrote:
> On Wed, Oct 20, 2010 at 09:07:12AM -0600, Alex Williamson wrote:
> > On Wed, 2010-10-20 at 16:46 +0200, Michael S. Tsirkin wrote:
> > > On Wed, Oct 20, 2010 at 08:47:14AM -0600, Alex Williamson wrote:
> > > > It would probably make sens
On Wed, Oct 20, 2010 at 02:13:01PM -0600, Alex Williamson wrote:
> On Wed, 2010-10-20 at 17:13 +0200, Michael S. Tsirkin wrote:
> > On Wed, Oct 20, 2010 at 09:07:12AM -0600, Alex Williamson wrote:
> > > On Wed, 2010-10-20 at 16:46 +0200, Michael S. Tsirkin wrote:
> > > > On Wed, Oct 20, 2010 at 08:
On Wed, Oct 20, 2010 at 04:26:24PM +0800, Sheng Yang wrote:
> Here is v2.
>
> Changelog:
>
> v1->v2
>
> The major change from v1 is I've added the in-kernel MSI-X mask emulation
> support, as well as adding shortcuts for reading MSI-X table.
The major thing everyone here is asking is whether th
On Thursday 21 October 2010 03:02:24 Marcelo Tosatti wrote:
> On Wed, Oct 20, 2010 at 04:26:24PM +0800, Sheng Yang wrote:
> > Here is v2.
> >
> > Changelog:
> >
> > v1->v2
> >
> > The major change from v1 is I've added the in-kernel MSI-X mask emulation
> > support, as well as adding shortcuts f
On Wednesday 20 October 2010 17:51:01 Avi Kivity wrote:
> On 10/20/2010 10:26 AM, Sheng Yang wrote:
> > Here is v2.
> >
> > Changelog:
> >
> > v1->v2
> >
> > The major change from v1 is I've added the in-kernel MSI-X mask emulation
> > support, as well as adding shortcuts for reading MSI-X tab
On Thu, Oct 21, 2010 at 03:10:19PM +0800, Sheng Yang wrote:
> On Thursday 21 October 2010 03:02:24 Marcelo Tosatti wrote:
> > On Wed, Oct 20, 2010 at 04:26:24PM +0800, Sheng Yang wrote:
> > > Here is v2.
> > >
> > > Changelog:
> > >
> > > v1->v2
> > >
> > > The major change from v1 is I've added
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