[vfio-users] can't get my video card to connect to my vm

[Stein van Broekhoven]

Thanks that got me a bit further. 
 dmesg | grep AMD-Vi
[    0.233077] [Firmware Bug]: AMD-Vi: IOAPIC[9] not in IVRS table
[    0.233083] [Firmware Bug]: AMD-Vi: IOAPIC[10] not in IVRS table
[    0.233087] [Firmware Bug]: AMD-Vi: No southbridge IOAPIC found
[    0.233090] AMD-Vi: Disabling interrupt remapping
[    1.901086] AMD-Vi: Found IOMMU at 0000:00:00.2 cap 0x40
[    1.917421] AMD-Vi: Lazy IO/TLB flushing enabled

Any starting point where I can find info on how to get iommu remapping in my kernel?

> Op 7 mrt. 2016 om 18:48 heeft Alex Williamson <alex.l.williamson at gmail.com> het volgende geschreven:
> 
>> On Mon, Mar 7, 2016 at 10:34 AM, Stein van Broekhoven <stein at aapjeisbaas.nl> wrote:
>> Dear All,
>> 
>> I can't get the video card which is using vfio to connect to my vm:
>> lspci -nnk
>> 06:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Turks XT [Radeon HD 6670/7670] [1002:6758]
>>         Subsystem: ASUSTeK Computer Inc. Device [1043:03ea]
>>         Kernel driver in use: vfio-pci
>>         Kernel modules: radeon, fglrx
>> 06:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Turks/Whistler HDMI Audio [Radeon HD 6000 Series] [1002:aa90]
>>         Subsystem: ASUSTeK Computer Inc. Device [1043:aa90]
>>         Kernel driver in use: vfio-pci
>>         Kernel modules: snd_hda_intel
>> 
>> I start the vm from cli with qemu command with sudo
>> The devices 06:00.0 and 06:00.1 are together in group 22
>> I added /dev/vfio/22 to acl in qemu config
> 
> You should never need to touch this acl list, besides it's for libvirt which you're not using if you're using the qemu command.
>  
>> When using vfio_iommu_type1.allow_unsafe_interrupts=1 on start vm I get the error:
>> stdout:
>> qemu-system-x86_64: -device vfio-pci,host=06:00.0,addr=09.0,multifunction=on: vfio: Error: Failed to setup INTx fd: Device or resource busy
>> qemu-system-x86_64: -device vfio-pci,host=06:00.0,addr=09.0,multifunction=on: Device initialization failed
>> dmesg:
>> genirq: Flags mismatch irq 55. 00000080 (vfio-intx(0000:06:00.0)) vs. 00000800 (fglrx[1]@PCI:6:0:0)
>> 
>> Without vfio_iommu_type1.allow_unsafe_interrupts=1 on start vm I get the error:
>> stdout:
>> vfio: failed to set iommu for container: Operation not permitted
>> dmesg:
>> vfio_iommu_type1_attach_group: No interrupt remapping support.  Use the module param "allow_unsafe_interrupts" to enable VFIO IOMMU support on this platform
>> 
>> system:
>> sabertooth 990FX v1.1
>> AMD FX-8120
>> main GPU: Radeon HD 5xxx
>> VM GPU: Radeon HD 6xxx
>> Manjaro (arch) kernel 4.1
> 
> looks like fglrx is still holding onto the IRQ and there's a flags mismatch, you should prevent fglrx from claiming the GPU by using pci-stub or vfio-pci to claim the device directly.  990FX should support interrupt remapping, so it's likely not enabled in your kernel. 
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