Xen project Mailing List

In addition to the suggestions given before, here some information sources:

HOW-TO make dual-boot obsolete using XEN VGA passthrough - post about Ubuntu 14.04 and Xen 4.4

Both posts above specifically deal with the AMD 6450 graphics card. I use the initramfs method to bind the graphics card to pciback as explained in HOW-TO make dual-boot obsolete using XEN VGA passthrough, step 11.

Hope it helps.

On Wednesday, June 25, 2014 4:51 AM, Brian Menges <bmenges@xxxxxxxxxx> wrote:

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

I've read:
http://support.citrix.com/article/CTX135811http://support.citrix.com/article/CTX135811
http://wiki.xen.org/wiki/Xen_VGA_Passthrough

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 (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 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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Re: [Xen-users] Help with VGA passthrough