On 07/25/2012 10:53 PM, Alex Williamson wrote: > 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,?
Read the documentation. > 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, It's not. e1000 is a guest visible feature. vfio and kvm assignment do exactly the same thing, as far as the guest is concerned, just using a different driver. This is more akin to -device virtio-net,vhost=on|off (where we also have a default and a fallback, which wouldn't make sense for model=e1000). -- error compiling committee.c: too many arguments to function
