[Qemu-devel] RE: Vhost support

[Liu Yu-B13201]

> -----Original Message-----
> From: Michael S. Tsirkin [mailto:address@hidden 
> Sent: Monday, February 21, 2011 7:46 PM
> To: Liu Yu-B13201
> Cc: address@hidden; 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:address@hidden 
> > > Sent: Monday, February 21, 2011 7:22 PM
> > > To: Liu Yu-B13201
> > > Cc: address@hidden; 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