[vfio-users] PCI passthrough prevents autostart of guest

[Colin Godsey]

You might have to try and early load the vfio module to head off any other
drivers that may try to acquire the device. You should be able to do this
with the rd.modules-load,modules-load kernel arguments.

http://www.dsm.fordham.edu/cgi-bin/man-cgi.pl?topic=systemd-modules-load.service&ampsect=8

On Thu, Mar 31, 2016 at 2:55 PM Pittman, Randall <
Randall.Pittman at oregonstate.edu> wrote:

> Hi,
>
>
>
> I have a custom PCI data acquisition card for which I only have Windows XP
> drivers, so I’m running WinXP in a QEMU-KVM VM under CentOS 7. I have PCI
> passthrough working fine. (I added the PCI card to the VM with
> virt-manager) However, the VM will not autostart on boot of the host
> machine. I have the following output in /var/log/libvirt/qemu/win_xp.log:
>
> 2016-03-29T18:29:26.191010Z qemu-kvm: -device
> vfio-pci,host=05:00.0,id=hostdev0,bus=pci.0,addr=0x7: vfio: Error: Failed
> to setup INTx fd: Device or resource busy
>
> 2016-03-29T18:29:26.289154Z qemu-kvm: -device
> vfio-pci,host=05:00.0,id=hostdev0,bus=pci.0,addr=0x7: Device initialization
> failed.
>
> 2016-03-29T18:29:26.289195Z qemu-kvm: -device
> vfio-pci,host=05:00.0,id=hostdev0,bus=pci.0,addr=0x7: Device 'vfio-pci'
> could not be initialized
>
>
>
> Again, this only happens at boot when the VM should be auto-starting. I
> can start it just fine manually with virsh or virt-manager. Perhaps the
> issue has to do with libvirtd starting too soon? N.b. I’m new to messing
> with init systems in general, systemd in particular.
>
>
>
> Any help would be greatly appreciated. I haven’t had any responses from
> the libvirt-users list, the CentOS forums, or my local university Linux
> mailing list.
>
>
>
> Thanks,
>
> Randy
>
>
>
> Extended info:
>
> ·         win_xp.xml file: http://pastebin.com/uBSbGDu6
>
> ·         Software versions from yum:
>
> o   CentOS - 7.2.1511
>
> o   libvirt - 1.2.17-13.el7_2.3
>
> o   qemu - 2:2.0.0-1.el7.6
>
> o   qemu-kvm - 10:1.5.3-105.el7_2.3
>
> ·         Hardware:
>
> o   CPU: Xeon E3-1231 v3, intel_iommu=on set in grub2
>
> o   lspci entry for the custom PCI card:
> 05:00.0 Unassigned class [ff00]: PLX Technology, Inc. PCI9054 32-bit 33MHz
> PCI <-> IOBus Bridge (rev 0b)
>
>
>
>
>
> *Randall Pittman*
>
> *Faculty Research Assistant **|** School of Civil and Construction
> Engineering **|** Oregon State University*
>
> Location: 006 Covell Hall | Mailing: 101 Kearney Hall | Corvallis, OR
> 97331-2132
>
> Office: 541-737-2102 | Mobile: 541-286-7896
>
>
> _______________________________________________
> vfio-users mailing list
> vfio-users at redhat.com
> https://www.redhat.com/mailman/listinfo/vfio-users
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/vfio-users/attachments/20160331/180812f0/attachment.htm>