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[Xen-users] Help with VGA passthrough

  • To: "xen-users@xxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxx>
  • From: Brian Menges <bmenges@xxxxxxxxxx>
  • Date: Wed, 25 Jun 2014 01:52:04 +0000
  • Accept-language: en-US
  • Delivery-date: Wed, 25 Jun 2014 01:52:14 +0000
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  • Thread-topic: Help with VGA passthrough

I'm trying to get vga passthrough to operate normally and have been rather 
unsuccessful despite attempting to replicate hardware stated to work much 
reading about the mail list and wiki.

Xenserver 6.2 SP1 (all patches)
ATI Radeon HD 6450
ThinkCentre M series with Core i5

I've read:

The GPU assignment to the HVM works fine through both api and gui (xencenter), 
however the domU can't initialize it. I've tried pciback.hide and 
xen-pciback.hide for the pci buses the ati card shows up as, however to no 
avail and results in it unable to use the gpu.

Dmesg about the pci bus (01:00.0 and 01:00.1):
[    4.225073] Kernel command line: root=LABEL=root-lsodryqz ro xencons=hvc 
console=hvc0 console=tty0 quiet vga=785 splash xen-pciback.permissive 
xen-pciback.hide=(01:00.0)(01:00.1) pci=resource_alignment=01:00.0;01:00.1
[    4.790356] pci 0000:01:00.0: reg 10 64bit mmio pref: [0xd0000000-0xdfffffff]
[    4.790369] pci 0000:01:00.0: reg 18 64bit mmio: [0xfe420000-0xfe43ffff]
[    4.790376] pci 0000:01:00.0: reg 20 io port: [0xe000-0xe0ff]
[    4.790389] pci 0000:01:00.0: reg 30 32bit mmio pref: [0xfe400000-0xfe41ffff]
[    4.790394] pci 0000:01:00.0: Disabling memory decoding and releasing memory 
[    4.790425] pci 0000:01:00.0: supports D1 D2
[    4.790479] pci 0000:01:00.1: reg 10 64bit mmio: [0xfe440000-0xfe443fff]
[    4.790513] pci 0000:01:00.1: Disabling memory decoding and releasing memory 
[    4.790543] pci 0000:01:00.1: supports D1 D2
[    4.794119] vgaarb: device added: 

When I assign it to a linux domU (yes, HVM):
00:05.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] 
Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM]
00:06.0 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Caicos HDMI Audio 
[Radeon HD 6400 Series]

[    5.246901] [drm] initializing kernel modesetting (CAICOS 0x1002:0x6779 
[    5.246970] [drm] register mmio base: 0xF3000000
[    5.246972] [drm] register mmio size: 131072
[    5.246996] radeon 0000:00:05.0: Expecting atombios for evergreen GPU
[    5.247053] radeon 0000:00:05.0: Fatal error during GPU init
[    5.247100] [drm] radeon: finishing device.
[    5.247102] [TTM] Memory type 2 has not been initialized
[    5.256465] radeon: probe of 0000:00:05.0 failed with error -22
[    5.386743] xen: --> pirq=17 -> irq=41 (gsi=41)

Here's dom0's extboot.conf for xe's boot:
label xe
  # XenServer
  kernel mboot.c32
  append /boot/xen.gz mem=1024G dom0_max_vcpus=4 dom0_mem=2048M,max:2048M 
watchdog_timeout=300 lowmem_emergency_pool=1M crashkernel=64M@32M 
cpuid_mask_xsave_eax=0 console=vga vga=mode-0x0311 --- /boot/vmlinuz-2.6-xen 
root=LABEL=root-lsodryqz ro xencons=hvc console=hvc0 console=tty0 quiet vga=785 
splash xen-pciback.permissive xen-pciback.hide=(01:00.0)(01:00.1) 
pci=resource_alignment=01:00.0;01:00.1 --- /boot/initrd-2.6-xen.img

So I've hidden them, however they're still showing up on dom0 and failing init 
on domU.

Can anyone provide some help?

- Brian Menges
Principal Engineer, DevOps
GoGrid | ServePath | ColoServe | UpStream Networks


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