[vfio-users] Linux guest passthrough
Alex Williamson
alex.l.williamson at gmail.com
Wed Jan 18 04:18:51 UTC 2017
On Tue, Jan 17, 2017 at 8:54 PM, Daniel Browne <jairuncaloth at gmail.com>
wrote:
> Hi guys,
> I've got a new Fedora 25 host setup and I am attempting to get an Ubuntu
> 16.40 guest running with VGA passthrough. On the guest, I've installed the
> official nvidia driver via the Ubuntu drivers tool. The nvidia driver
> loads, but xorg.log shows the error "failed to initialize glx extension
> (compatible nvidia x driver not found)"
>
> Based on an e-mail to this list from the last time I attempted this, it is
> my understanding that you need a Q35 machine and a valid pci-e bus setup to
> make this all work.
>
I'm not sure how much this is true, that you need a "valid pci-e bus
setup", but you haven't got one. AFAIK, the PCI-e root port issues are
limited to Radeon.
I *believe* I have a valid pci-e setup with Q35, but I'm honestly not
> entirely sure. Most of what I've found regarding the subject is a bit light
> on details. I would appreciate it if someone could look over my domain XML
> below and help me figure out what I'm doing wrong.
>
> <domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0
> '>
> <name>ubuntu16.04</name>
> <uuid>80e1008f-b83c-47c7-a334-c9a07577751c</uuid>
> <memory unit='KiB'>4184064</memory>
> <currentMemory unit='KiB'>4184064</currentMemory>
> <vcpu placement='static'>2</vcpu>
> <os>
> <type arch='x86_64' machine='pc-q35-2.7'>hvm</type>
> <loader readonly='yes' type='pflash'>/usr/share/edk2/
> ovmf/OVMF_CODE.fd</loader>
> <nvram>/var/lib/libvirt/qemu/nvram/ubuntu16.04_VARS.fd</nvram>
> <boot dev='hd'/>
> </os>
> <features>
> <acpi/>
> <apic/>
> <kvm>
> <hidden state='on'/>
> </kvm>
> <vmport state='off'/>
> </features>
> <cpu mode='custom' match='exact'>
> <model fallback='allow'>Haswell-noTSX</model>
> </cpu>
> <clock offset='utc'>
> <timer name='rtc' tickpolicy='catchup'/>
> <timer name='pit' tickpolicy='delay'/>
> <timer name='hpet' present='no'/>
> </clock>
> <on_poweroff>destroy</on_poweroff>
> <on_reboot>restart</on_reboot>
> <on_crash>restart</on_crash>
> <pm>
> <suspend-to-mem enabled='no'/>
> <suspend-to-disk enabled='no'/>
> </pm>
> <devices>
> <emulator>/usr/bin/qemu-kvm</emulator>
> <disk type='file' device='disk'>
> <driver name='qemu' type='raw'/>
> <source file='/var/lib/libvirt/images/ubuntu.img'/>
> <target dev='vda' bus='virtio'/>
> <address type='pci' domain='0x0000' bus='0x02' slot='0x04'
> function='0x0'/>
> </disk>
> <disk type='file' device='cdrom'>
> <driver name='qemu' type='raw'/>
> <target dev='sda' bus='sata'/>
> <readonly/>
> <address type='drive' controller='0' bus='0' target='0' unit='0'/>
> </disk>
> <controller type='usb' index='0' model='ich9-ehci1'>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x1d'
> function='0x7'/>
> </controller>
> <controller type='usb' index='0' model='ich9-uhci1'>
> <master startport='0'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x1d'
> function='0x0' multifunction='on'/>
> </controller>
> <controller type='usb' index='0' model='ich9-uhci2'>
> <master startport='2'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x1d'
> function='0x1'/>
> </controller>
> <controller type='usb' index='0' model='ich9-uhci3'>
> <master startport='4'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x1d'
> function='0x2'/>
> </controller>
> <controller type='sata' index='0'>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x1f'
> function='0x2'/>
> </controller>
> <controller type='pci' index='0' model='pcie-root'/>
> <controller type='pci' index='1' model='dmi-to-pci-bridge'>
> <model name='i82801b11-bridge'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x1e'
> function='0x0'/>
> </controller>
> <controller type='pci' index='2' model='pci-bridge'>
> <model name='pci-bridge'/>
> <target chassisNr='2'/>
> <address type='pci' domain='0x0000' bus='0x01' slot='0x00'
> function='0x0'/>
> </controller>
>
Add a PCIe root port here:
<controller type='pci' index='3' model='pcie-root-port'>
<address type='pci' domain='0x0' bus='0x0' slot='0x1c' function='0'/>
</controller>
<controller type='virtio-serial' index='0'>
> <address type='pci' domain='0x0000' bus='0x02' slot='0x03'
> function='0x0'/>
> </controller>
> <interface type='network'>
> <mac address='52:54:00:11:00:b1'/>
> <source network='default'/>
> <model type='virtio'/>
> <address type='pci' domain='0x0000' bus='0x02' slot='0x01'
> function='0x0'/>
> </interface>
> <serial type='pty'>
> <target port='0'/>
> </serial>
> <console type='pty'>
> <target type='serial' port='0'/>
> </console>
> <channel type='spicevmc'>
> <target type='virtio' name='com.redhat.spice.0'/>
> <address type='virtio-serial' controller='0' bus='0' port='1'/>
> </channel>
> <input type='mouse' bus='ps2'/>
> <input type='keyboard' bus='ps2'/>
> <graphics type='spice' autoport='yes'>
> <listen type='address'/>
> <image compression='off'/>
> </graphics>
> <sound model='ich6'>
> <address type='pci' domain='0x0000' bus='0x02' slot='0x02'
> function='0x0'/>
> </sound>
> <video>
> <model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1'
> primary='yes'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x01'
> function='0x0'/>
> </video>
>
Hmm, you have emulated QXL graphics too, this alone could be the source of
your problem. Generally the xorg.conf needs a BusID to pick the right
device in this sort of setup, but I can't vouch for GeForce working as
secondary in a Linux guest.
> <hostdev mode='subsystem' type='pci' managed='yes'>
> <driver name='vfio'/>
> <source>
> <address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
> </source>
> <address type='pci' domain='0x0000' bus='0x02' slot='0x06'
> function='0x0'/>
> </hostdev>
>
Chance the address to:
<address type='pci' domain='0x0000' bus='0x03' slot='0x00' function='0x0'/>
Bus = 3 puts it on the index = 3 pcie-root-port above
> <hostdev mode='subsystem' type='pci' managed='yes'>
> <driver name='vfio'/>
> <source>
> <address domain='0x0000' bus='0x01' slot='0x00' function='0x1'/>
> </source>
> <address type='pci' domain='0x0000' bus='0x02' slot='0x07'
> function='0x0'/>
> </hostdev>
> <redirdev bus='usb' type='spicevmc'>
> <address type='usb' bus='0' port='1'/>
> </redirdev>
> <redirdev bus='usb' type='spicevmc'>
> <address type='usb' bus='0' port='2'/>
> </redirdev>
> <memballoon model='virtio'>
> <address type='pci' domain='0x0000' bus='0x02' slot='0x05'
> function='0x0'/>
> </memballoon>
> </devices>
> <qemu:commandline>
> <qemu:arg value='-set'/>
> <qemu:arg value='device.hostdev0.x-vga=on'/>
> </qemu:commandline>
>
Kudos for good use of <qemu:arg>, but you're running an OVMF VM, so you
don't want to use this. Thanks,
Alex
> </domain>
>
> Thanks,
> Daniel
>
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>
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