[Xen-API] Help with VGA passthrough

[Brian Menges <bmenges@xxxxxxxxxx>]

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.

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

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 
resources.
[    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 
resources.
[    4.790543] pci 0000:01:00.1: supports D1 D2
[    4.794119] vgaarb: device added: 
PCI:0000:01:00.0,decodes=io+mem,owns=none,locks=none

When I assign it to a linux domU:
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 
0x1682:0x3207).
[    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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