Re: [Xen-users] Help with VGA passthrough

[Brian Menges <bmenges@xxxxxxxxxx>]

[root@xs ~]# lsmod | grep pciback
[root@xs ~]# echo $?
1
[root@xs ~]# modprobe pciback
FATAL: Module pciback not found.
[root@xs ~]# zgrep -e '^CONFIG_XEN_PCI' /proc/config.gz
CONFIG_XEN_PCIDEV_FRONTEND=y
CONFIG_XEN_PCIDEV_BACKEND=y
CONFIG_XEN_PCIDEV_BACKEND_VPCI=y

Well looks like its compiled into the kernel so that's good news.

Xenserver 6.2 appears to be a CentOS 5.x (maybe 5.6) box.

I installed the proprietary drivers in an Ubuntu 12.04 LTS VM, and it won't get 
past the splash screen (xencenter display) now after gpu assignment (console or 
gui). The Ubuntu drivers appear to do nothing; however:

$ dmesg | grep -E '(fglrx|ATI|radeon|pci)'
[    0.188377] PCI: Using host bridge windows from ACPI; if necessary, use 
"pci=nocrs" and report a bug
[    0.251997] pci_bus 0000:00: root bus resource [bus 00-ff]
[    0.252000] pci_bus 0000:00: root bus resource [io  0x0000-0x0cf7]
[    0.252000] pci_bus 0000:00: root bus resource [io  0x0d00-0xffff]
[    0.252000] pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff]
[    0.252000] pci_bus 0000:00: root bus resource [mem 0xe0000000-0xfbffffff]
[    0.252062] pci 0000:00:00.0: [8086:1237] type 00 class 0x060000
[    0.253138] pci 0000:00:01.0: [8086:7000] type 00 class 0x060100
[    0.254100] pci 0000:00:01.1: [8086:7010] type 00 class 0x010180
[    0.254730] pci 0000:00:01.1: reg 0x20: [io  0xc320-0xc32f]
[    0.255652] pci 0000:00:01.2: [8086:7020] type 00 class 0x0c0300
[    0.256222] pci 0000:00:01.2: reg 0x20: [io  0xc300-0xc31f]
[    0.257100] pci 0000:00:01.3: [8086:7113] type 00 class 0x068000
[    0.257833] pci 0000:00:01.3: quirk: [io  0x1f40-0x1f7f] claimed by PIIX4 
ACPI
[    0.258529] pci 0000:00:02.0: [1013:00b8] type 00 class 0x030000
[    0.258684] pci 0000:00:02.0: reg 0x10: [mem 0xf0000000-0xf1ffffff pref]
[    0.258799] pci 0000:00:02.0: reg 0x14: [mem 0xf3044000-0xf3044fff]
[    0.259758] pci 0000:00:03.0: [5853:0001] type 00 class 0x010000
[    0.259970] pci 0000:00:03.0: reg 0x10: [io  0xc000-0xc0ff]
[    0.260101] pci 0000:00:03.0: reg 0x14: [mem 0xf2000000-0xf2ffffff pref]
[    0.261722] pci 0000:00:05.0: [1002:6779] type 00 class 0x030000
[    0.268018] pci 0000:00:05.0: reg 0x10: [mem 0xe0000000-0xefffffff 64bit 
pref]
[    0.276017] pci 0000:00:05.0: reg 0x18: [mem 0xf3000000-0xf301ffff 64bit]
[    0.284008] pci 0000:00:05.0: reg 0x20: [io  0xc200-0xc2ff]
[    0.300024] pci 0000:00:05.0: reg 0x30: [mem 0xf3020000-0xf303ffff pref]
[    0.301115] pci 0000:00:05.0: supports D1 D2
[    0.301887] pci 0000:00:06.0: [1002:aa98] type 00 class 0x040300
[    0.302169] pci 0000:00:06.0: reg 0x10: [mem 0xf3040000-0xf3043fff 64bit]
[    0.303969] pci 0000:00:06.0: supports D1 D2
[    0.332081] PCI: pci_cache_line_size set to 64 bytes
[    1.309926] pci_bus 0000:00: resource 4 [io  0x0000-0x0cf7]
[    1.309930] pci_bus 0000:00: resource 5 [io  0x0d00-0xffff]
[    1.309933] pci_bus 0000:00: resource 6 [mem 0x000a0000-0x000bffff]
[    1.309935] pci_bus 0000:00: resource 7 [mem 0xe0000000-0xfbffffff]
[    1.310908] pci 0000:00:00.0: Limiting direct PCI/PCI transfers
[    1.310954] pci 0000:00:01.0: PIIX3: Enabling Passive Release
[    1.311000] pci 0000:00:01.0: Activating ISA DMA hang workarounds
[    1.312047] pci 0000:00:02.0: Boot video device
[    1.312215] pci 0000:00:05.0: Boot video device
[    1.534735] pci_hotplug: PCI Hot Plug PCI Core version: 0.5
[    1.534744] pciehp: PCI Express Hot Plug Controller Driver version: 0.4
[    1.576902] ehci-pci: EHCI PCI platform driver
[    1.576942] ohci-pci: OHCI PCI platform driver
[    1.692123] xenbus_probe_frontend: Device with no driver: device/pci/0
[    6.180380] fglrx: module license 'Proprietary. (C) 2002 - ATI Technologies, 
Starnberg, GERMANY' taints kernel.
[    6.185911] fglrx: module verification failed: signature and/or required key 
missing - tainting kernel
[    6.193979] <6>[fglrx] Maximum main memory to use for locked dma buffers: 
7247 MBytes.
[    6.194094] <6>[fglrx]   vendor: 1002 device: 6779 count: 1
[    6.194835] <6>[fglrx] ioport: bar 4, base 0xc200, size: 0x100
[    6.195932] <6>[fglrx] Kernel PAT support is enabled
[    6.195960] <6>[fglrx] module loaded - fglrx 14.10.2 [May  5 2014] with 1 
minors
[    6.753214] input: QEMU 0.10.2 QEMU USB Tablet as 
/devices/pci0000:00/0000:00:01.2/usb1/1-2/1-2:1.0/input/input3
[    6.764783] input: HD-Audio Generic HDMI/DP,pcm=3 as 
/devices/pci0000:00/0000:00:06.0/sound/card0/input4
[   11.494543] <6>[fglrx] Firegl kernel thread PID: 1260
[   11.494773] <6>[fglrx] Firegl kernel thread PID: 1261
[   11.495004] <6>[fglrx] Firegl kernel thread PID: 1262
[   11.495154] <6>[fglrx] IRQ 78 Enabled
[   11.541569] <6>[fglrx] Reserved FB block: Shared offset:0, size:1000000
[   11.541571] <6>[fglrx] Reserved FB block: Unshared offset:f838000, size:4000
[   11.541572] <6>[fglrx] Reserved FB block: Unshared offset:f83c000, 
size:4c4000
[   11.541573] <6>[fglrx] Reserved FB block: Unshared offset:7fff4000, size:c000

So my last boot I got in via SSH, however the displays aren't working. I first 
tried the HDMI (HDMI - HDMI) display then the DVI (DVI -> DisplayPort) display 
and my monitor isn't showing anything. Wodnering what I'm missing to get this 
display up and running.

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

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxx] 
On Behalf Of Gordan Bobic
Sent: Wednesday, June 25, 2014 22:55
To: xen-users@xxxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Help with VGA passthrough

On 06/26/2014 12:04 AM, Brian Menges wrote:
> I've read through these, however I'm on xenserver 6.2 and would rather
> not hack the ramdisk because any future update would obliterate that
> (most likely).

Not if you modify the dracut scripts to do the right ting. AFAIK XenServer is 
based on EL.

> Per gordon's request, I've reset my system back to factory and here
> are the lspci/dmesg/xl dmesg.
>
> I can confirm that I do not load any radeon or radeon related drivers
> in dom0, however I cannot seem to hide the pci bus for it. Are the
> modules missing for XenServer 6.2 (xen 4.1.5) ?

Not loading the radeon driver is good. The PCI bus should not be hidden, the 
device you are passing through should just be owned by the xen-pciback driver 
(which the xl command for making the device assignable will do for you if you 
aren't pre-loading xen-pciback with appropriate options.

> The citrix support guide says nothing about hiding the device at all
> (which I tried the extboot.conf stuff to hide the pci devices to no avail).

You _shouldn't_ be doing this anyway. All you can do is detach the device to 
make it disappear, but then you won't be able to pass it through.

> If there's a way to confirm xen-pcihide or whichever it is (many
> articles .. two names, not sure which is right) as loaded on xenserver
> 6.2 that'd be appreciated.

lsmod | grep pciback

> I have in blacklist.conf:
>
> blacklist radeon
>
> blacklist fglrx
>
> We shouldn't ever touch those two modules... so I should be good for
> passthrough right?

Yes.

Gordan

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