[vfio-users] Linux guest passthrough
Daniel Browne
jairuncaloth at gmail.com
Wed Jan 18 04:46:34 UTC 2017
Works perfectly now! Thank you Alex!
Thanks,
Daniel
On Tue, Jan 17, 2017 at 11:18 PM, Alex Williamson <
alex.l.williamson at gmail.com> wrote:
> 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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>> vfio-users at redhat.com
>> https://www.redhat.com/mailman/listinfo/vfio-users
>>
>>
>
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