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* [Qemu-devel] Vhost support
@ 2011-02-21 11:13 Liu Yu-B13201
  2011-02-21 11:22 ` [Qemu-devel] " Michael S. Tsirkin
  0 siblings, 1 reply; 5+ messages in thread
From: Liu Yu-B13201 @ 2011-02-21 11:13 UTC (permalink / raw)
  To: qemu-devel@nongnu.org; +Cc: Yoder Stuart-B08248, mst@redhat.com


Hello everyone,

Does anyone know the status of vhost in upstream qemu?
We would like to try vhost with kvm on powerpc e500v2 platform,
but obviously, powerpc kvm only works with upstream qemu.

KVM wike page says it needs to enable CONFIG_PCI_MSI for guest kernel.
Is MSI a necessary?

Thanks,
Yu

^ permalink raw reply	[flat|nested] 5+ messages in thread
* [Qemu-devel] Re: Vhost support
  2011-02-21 11:13 [Qemu-devel] Vhost support Liu Yu-B13201
@ 2011-02-21 11:22 ` Michael S. Tsirkin
  2011-02-21 11:41   ` [Qemu-devel] " Liu Yu-B13201
  0 siblings, 1 reply; 5+ messages in thread
From: Michael S. Tsirkin @ 2011-02-21 11:22 UTC (permalink / raw)
  To: Liu Yu-B13201; +Cc: Yoder Stuart-B08248, qemu-devel@nongnu.org

On Mon, Feb 21, 2011 at 11:13:33AM +0000, Liu Yu-B13201 wrote:
> 
> Hello everyone,
> 
> Does anyone know the status of vhost in upstream qemu?
> We would like to try vhost with kvm on powerpc e500v2 platform,
> but obviously, powerpc kvm only works with upstream qemu.
> 
> KVM wike page says it needs to enable CONFIG_PCI_MSI for guest kernel.
> Is MSI a necessary?
> 
> Thanks,
> Yu

At the moment, yes.
The issue is not with vhost, it's that irqfd in kvm
only works with MSI at the moment.

-- 
MST

^ permalink raw reply	[flat|nested] 5+ messages in thread
* [Qemu-devel] RE: Vhost support
  2011-02-21 11:22 ` [Qemu-devel] " Michael S. Tsirkin
@ 2011-02-21 11:41   ` Liu Yu-B13201
  2011-02-21 11:46     ` [Qemu-devel] " Michael S. Tsirkin
  0 siblings, 1 reply; 5+ messages in thread
From: Liu Yu-B13201 @ 2011-02-21 11:41 UTC (permalink / raw)
  To: Michael S. Tsirkin; +Cc: Yoder Stuart-B08248, qemu-devel@nongnu.org

 

> -----Original Message-----
> From: Michael S. Tsirkin [mailto:mst@redhat.com] 
> Sent: Monday, February 21, 2011 7:22 PM
> To: Liu Yu-B13201
> Cc: qemu-devel@nongnu.org; Yoder Stuart-B08248
> Subject: Re: Vhost support
> 
> On Mon, Feb 21, 2011 at 11:13:33AM +0000, Liu Yu-B13201 wrote:
> > 
> > Hello everyone,
> > 
> > Does anyone know the status of vhost in upstream qemu?
> > We would like to try vhost with kvm on powerpc e500v2 platform,
> > but obviously, powerpc kvm only works with upstream qemu.
> > 
> > KVM wike page says it needs to enable CONFIG_PCI_MSI for 
> guest kernel.
> > Is MSI a necessary?
> > 
> > Thanks,
> > Yu
> 
> At the moment, yes.
> The issue is not with vhost, it's that irqfd in kvm
> only works with MSI at the moment.
> 

Hi Michael,

Thanks for your answer.
But I don't find MSI or irqfd support in upstream qemu.
Does it mean upstream qemu not support virtio/vhost for now?


Thanks,
Yu

^ permalink raw reply	[flat|nested] 5+ messages in thread
* [Qemu-devel] Re: Vhost support
  2011-02-21 11:41   ` [Qemu-devel] " Liu Yu-B13201
@ 2011-02-21 11:46     ` Michael S. Tsirkin
  2011-02-21 11:51       ` [Qemu-devel] " Liu Yu-B13201
  0 siblings, 1 reply; 5+ messages in thread
From: Michael S. Tsirkin @ 2011-02-21 11:46 UTC (permalink / raw)
  To: Liu Yu-B13201; +Cc: Yoder Stuart-B08248, qemu-devel@nongnu.org

On Mon, Feb 21, 2011 at 11:41:39AM +0000, Liu Yu-B13201 wrote:
>  
> 
> > -----Original Message-----
> > From: Michael S. Tsirkin [mailto:mst@redhat.com] 
> > Sent: Monday, February 21, 2011 7:22 PM
> > To: Liu Yu-B13201
> > Cc: qemu-devel@nongnu.org; Yoder Stuart-B08248
> > Subject: Re: Vhost support
> > 
> > On Mon, Feb 21, 2011 at 11:13:33AM +0000, Liu Yu-B13201 wrote:
> > > 
> > > Hello everyone,
> > > 
> > > Does anyone know the status of vhost in upstream qemu?
> > > We would like to try vhost with kvm on powerpc e500v2 platform,
> > > but obviously, powerpc kvm only works with upstream qemu.
> > > 
> > > KVM wike page says it needs to enable CONFIG_PCI_MSI for 
> > guest kernel.
> > > Is MSI a necessary?
> > > 
> > > Thanks,
> > > Yu
> > 
> > At the moment, yes.
> > The issue is not with vhost, it's that irqfd in kvm
> > only works with MSI at the moment.
> > 
> 
> Hi Michael,
> 
> Thanks for your answer.
> But I don't find MSI or irqfd support in upstream qemu.
> Does it mean upstream qemu not support virtio/vhost for now?
> 
> 
> Thanks,
> Yu

Ahm you mean not qemu-kvm?  It does, just slowly by going through
userspace.  You can force vhost bouncing without msi as well, by
setting vhostforce.

-- 
MST

^ permalink raw reply	[flat|nested] 5+ messages in thread
* [Qemu-devel] RE: Vhost support
  2011-02-21 11:46     ` [Qemu-devel] " Michael S. Tsirkin
@ 2011-02-21 11:51       ` Liu Yu-B13201
  0 siblings, 0 replies; 5+ messages in thread
From: Liu Yu-B13201 @ 2011-02-21 11:51 UTC (permalink / raw)
  To: Michael S. Tsirkin; +Cc: Yoder Stuart-B08248, qemu-devel@nongnu.org

 

> -----Original Message-----
> From: Michael S. Tsirkin [mailto:mst@redhat.com] 
> Sent: Monday, February 21, 2011 7:46 PM
> To: Liu Yu-B13201
> Cc: qemu-devel@nongnu.org; Yoder Stuart-B08248
> Subject: Re: Vhost support
> 
> On Mon, Feb 21, 2011 at 11:41:39AM +0000, Liu Yu-B13201 wrote:
> >  
> > 
> > > -----Original Message-----
> > > From: Michael S. Tsirkin [mailto:mst@redhat.com] 
> > > Sent: Monday, February 21, 2011 7:22 PM
> > > To: Liu Yu-B13201
> > > Cc: qemu-devel@nongnu.org; Yoder Stuart-B08248
> > > Subject: Re: Vhost support
> > > 
> > > On Mon, Feb 21, 2011 at 11:13:33AM +0000, Liu Yu-B13201 wrote:
> > > > 
> > > > Hello everyone,
> > > > 
> > > > Does anyone know the status of vhost in upstream qemu?
> > > > We would like to try vhost with kvm on powerpc e500v2 platform,
> > > > but obviously, powerpc kvm only works with upstream qemu.
> > > > 
> > > > KVM wike page says it needs to enable CONFIG_PCI_MSI for 
> > > guest kernel.
> > > > Is MSI a necessary?
> > > > 
> > > > Thanks,
> > > > Yu
> > > 
> > > At the moment, yes.
> > > The issue is not with vhost, it's that irqfd in kvm
> > > only works with MSI at the moment.
> > > 
> > 
> > Hi Michael,
> > 
> > Thanks for your answer.
> > But I don't find MSI or irqfd support in upstream qemu.
> > Does it mean upstream qemu not support virtio/vhost for now?
> > 
> > 
> > Thanks,
> > Yu
> 
> Ahm you mean not qemu-kvm?  It does, just slowly by going through
> userspace.  You can force vhost bouncing without msi as well, by
> setting vhostforce.
> 

PowerPC kvm work with upstream qemu but not qemu-kvm..
OK. Thanks for your information, I'll look into that.

Thanks,
Yu

^ permalink raw reply	[flat|nested] 5+ messages in thread
end of thread, other threads:[~2011-02-21 11:52 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2011-02-21 11:13 [Qemu-devel] Vhost support Liu Yu-B13201
2011-02-21 11:22 ` [Qemu-devel] " Michael S. Tsirkin
2011-02-21 11:41   ` [Qemu-devel] " Liu Yu-B13201
2011-02-21 11:46     ` [Qemu-devel] " Michael S. Tsirkin
2011-02-21 11:51       ` [Qemu-devel] " Liu Yu-B13201

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