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Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu

From: Alex Williamson
Subject: Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu
Date: Wed, 25 Jul 2012 13:53:46 -0600

On Wed, 2012-07-25 at 22:30 +0300, Avi Kivity wrote:
> On 07/25/2012 08:03 PM, Alex Williamson wrote:
> > This adds PCI based device assignment to Qemu using the Linux VFIO
> > userspace driver interface.  After setting up VFIO device access,
> > devices can be added to Qemu guests using the vfio-pci device
> > option:
> >
> >  -device vfio-pci,host=1:10.1,id=net0
> >
> >
> Let's use the same syntax as for kvm device assignment.  Then we can
> fall back on kvm when vfio is not available.  We can also have an
> optional parameter kernel-driver to explicitly select vfio or kvm.

This seems confusing to me, pci-assign already has options like
prefer_msi, share_intx, and configfd that vfio doesn't.  I'm sure vfio
will eventually get options that pci-assign won't have.  How is a user
supposed to figure out what options are actually available from -device
pci-assign,?  Isn't this the same as asking to drop all model specific
devices and just use -device net,model=e1000... hey, we've been there
before ;)  Thanks,


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