[vfio-users] vfio-pci with amd gpu in kernel 4.14.10+

Thu Jan 11 10:47:12 UTC 2018

Unfortunately I have to use the kernel cmdline syntax as I made a
mistake of buying an Asus motherboard. The RX480 is my primary/boot gpu
and you cant change that in the Asus bios like you can with eg Gigabyte.

Thinking about it, this is probably also the reason why vfio doesnt bind
anymore. Probably something changed in the kernel because of which the
primary/boot gpu cant be 'unloaded' anymore?

Comparing the dmesg outputs, it looks like the amd driver is loaded
before vfio in 4.14.13, eg dmesg still lists that vfio is adding the
67df device but the amdgpu driver is already loaded then. See excerpts
of dmesg in 4.14.13 below:

[    0.208096] pci 0000:02:00.0: vgaarb: VGA device added:
decodes=io+mem,owns=none,locks=none
[    0.208096] pci 0000:01:00.0: vgaarb: setting as boot VGA device
[    0.208096] pci 0000:01:00.0: vgaarb: VGA device added:
decodes=io+mem,owns=io+mem,locks=none
[    0.208122] pci 0000:01:00.0: vgaarb: bridge control possible
[    0.208152] pci 0000:02:00.0: vgaarb: bridge control possible
[    0.208181] vgaarb: loaded
...
[    0.276067] pci 0000:01:00.0: Video device with shadowed ROM at [mem
0x000c0000-0x000dffff]
...
[    4.584958] amdgpu 0000:01:00.0: Invalid PCI ROM header signature:
expecting 0xaa55, got 0xffff
[    4.585028] ATOM BIOS: 113-V34111-F1
[    4.585050] [drm] GPU post is not needed
[    4.585348] [drm] vm size is 64 GB, block size is 13-bit, fragment
size is 4-bit
[    4.585416] amdgpu 0000:01:00.0: VRAM: 8192M 0x000000F400000000 -
0x000000F5FFFFFFFF (8192M used)
[    4.585461] amdgpu 0000:01:00.0: GTT: 256M 0x0000000000000000 -
0x000000000FFFFFFF
[    4.585501] [drm] Detected VRAM RAM=8192M, BAR=256M
[    4.585525] [drm] RAM width 256bits GDDR5
[    4.585549] [drm] amdgpu: 8192M of VRAM memory ready
[    4.585572] [drm] amdgpu: 8192M of GTT memory ready.
[    4.585603] [drm] GART: num cpu pages 65536, num gpu pages 65536
[    4.585673] [drm] PCIE GART of 256M enabled (table at
0x000000F400040000).
[    4.585719] [drm] Supports vblank timestamp caching Rev 2 (21.10.2
[    4.585799] amdgpu 0000:01:00.0: amdgpu: using MSI.
[    4.585832] [drm] amdgpu: irq initialized.
[    4.595990] usb 3-10: new full-speed USB device number 10 using xhci_hcd
[    4.697313] amdgpu: [powerplay] amdgpu: powerplay sw initialized
[    4.697560] [drm] AMDGPU Display Connectors
[    4.697581] [drm] Connector 0:
...
[    6.013088] amdgpu 0000:01:00.0: fb1: amdgpudrmfb frame buffer device
[    6.013235] amdgpu 0000:01:00.0: kfd not supported on this ASIC
[    6.013255] [drm] Initialized amdgpu 3.19.0 20150101 for 0000:01:00.0
on minor 1
[    6.024444] scsi 0:0:0:0: Direct-Access     Generic  Ultra HS-SD/MMC 
1.82 PQ: 0 ANSI: 0
[    6.024627] sd 0:0:0:0: Attached scsi generic sg0 type 0
[    6.049487] sd 0:0:0:0: [sda] Attached SCSI removable disk
[    6.061022] VFIO - User Level meta-driver version: 0.3
[    6.064451] vfio_pci: add [1002:67df[ffff:ffff]] class 0x000000/00000000
[    6.088016] vfio_pci: add [1002:aaf0[ffff:ffff]] class 0x000000/00000000

As you requested, the output of lspci (in 4.14.13). The 67ed is a RX460
which I use for the host, the RX480 is for the guest.

01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Device [1002:67df] (rev c7)
        Subsystem: Micro-Star International Co., Ltd. [MSI] Device
[1462:3413]
        Kernel driver in use: amdgpu
        Kernel modules: amdgpu
01:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI]
Device [1002:aaf0]
        Subsystem: Micro-Star International Co., Ltd. [MSI] Device
[1462:aaf0]
        Kernel driver in use: vfio-pci
        Kernel modules: snd_hda_intel
02:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Device [1002:67ef] (rev cf)
        Subsystem: XFX Pine Group Inc. Device [1682:9460]
        Kernel driver in use: amdgpu
        Kernel modules: amdgpu
02:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI]
Device [1002:aae0]
        Subsystem: XFX Pine Group Inc. Device [1682:aae0]
        Kernel driver in use: snd_hda_intel
        Kernel modules: snd_hda_intel

On 11/01/18 10:57, Peter Maloney wrote:
> Let's see an `lspci -knn` for each of those devices.
>
> I'm using 4.14.x and have 3 AMD gpus, one for the host, and 2 for VMs,
> and it works.
>
> But I don't use the pci-stub.ids or the vfio-pic.ids kernel cmdline
> syntax... I bind by pci address instead of vendor:device since they're
> non-unique (using my script here
> https://github.com/petermaloney/misc/blob/master/mkinitcpio-vfio-pci/hooks/vfio-pci).
> PCI address can change on firmware updates or moving cards around, but
> stays the same otherwise in my experience.
>
> On 01/11/18 10:24, P. Pronk wrote:
>>
>>
>> Hi,
>>
>> Is someone successfully using a kernel version of 4.14.10 or higher
>> with an AMD graphics card? It seems my RX480 vga controller (67df)
>> wont use the vfio-pci driver in 4.14.10+ anymore, even though the
>> RX480 audio device (aaf0) will. I have both
>> 'pci-stub.ids=1002:67df,1002:aaf0' listed in my grub cmdline as
>> 'options vfio-pci ids=1002:67df,1002:aaf0' in modprobe.d/vfio-pci.conf
>>
>> Did something change since 4.14.10? Checking the kernel changelogs
>> doesnt show anything (immediately) related to either vfio-pci or the
>> amd gpu kernel driver.
>>
>> To be clear, in kernel version 4.14.9 everything still works as
>> expected for me.
>>
>> Thanks, Pim
>>
>>
>>
>>
>> _______________________________________________
>> vfio-users mailing list
>> vfio-users at redhat.com
>> https://www.redhat.com/mailman/listinfo/vfio-users
>
>

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