[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-users] VGA passthrough - anyone with Radeon in linux guest to compare output?


  • To: xen-users@xxxxxxxxxxxxx
  • From: Gordan Bobic <gordan@xxxxxxxxxx>
  • Date: Sat, 14 Mar 2015 09:53:16 +0000
  • Delivery-date: Sat, 14 Mar 2015 09:54:38 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>

I cannot say I have ever seen passthrough of the only GPU in the system work on any hypervisor. In practically every case I have seen it is always the GPU that is secondary on the host being passed as the secondary GPU to the domU.

I'm not saying it's impossible, I'm just saying I've never seen it work.


On 03/14/2015 01:27 AM, Jiri 'Ghormoon' Novak wrote:
Hi,

how do you mean to load the VBIOS?
I've found that config gfx_passthru=1 exists, but then qemu doesn't start.
When I try bios="ovmf" qemu starts, but the VM dies in few seconds, I
didn't manage to get anything out of it (I'm passing my only GPU, can't
watch it from the dom0).
It doesn't matter much if I have the cirrus on or not (only the number
changes to 00:06.0).
In dmesg I've found evidence that the ROM (VBIOS?) is missing, though
that's all I have ...

[    2.168598] radeon 0000:00:06.0: Invalid ROM contents
[    2.175729] radeon 0000:00:06.0: Invalid ROM contents
[    2.179335] [drm:radeon_get_bios] *ERROR* Unable to locate a BIOS ROM
[    2.179378] radeon 0000:00:06.0: Fatal error during GPU init
[    2.179408] [drm] radeon: finishing device.
[    2.179409] [TTM] Memory type 2 has not been initialized

Any ideas how to pass the ROM correctly?
Thanks,
Ghor

PS: the drivers are already installed in the domU, I can boot it
bare-metal and the gpu works.

Gordan Bobic wrote:
Until you install the driver in the guest, you need the emulated VGA
card to get any output. For primary VGA pass through you need to
either side load the card's VBIOS or use OVMF with a GPU that has a
UEFI capable VBIOS.

On 13 Mar 2015 00:25, Jiri 'Ghormoon' Novak <ghormoon@xxxxxxxxx> wrote:
Hi,

I'm attemting VGA passthrough, passing in Radeon 6470M.

Using Xen 4.5 on Debian - to be able to use vga="none" so the cirrus
doesn't mess in.
Though I was in similar situation on 4.4.

The problem is that Radeon driver in guest doesn't bind on the card.
Also when I try Windows guest (either installed or try to boot iso to
install),
I see nothing (though I don't know how to debug next then, so I'm
attempting linux guest first).
When I had cirrus on in Windows, it always complained on the Radeon that
it can't bind the memory range cirrus uses.

Here lspci output, first one is on real HW, second the passed one.
It misses few of the lines (maybe the "vendor specific information" one
makes difference, or maybe the "MSI: Enable-").
So the question is, can anyone with Radeon confirm they can bind it
without that line?
Or do you manage to pass it to the domU somehow too?

Lspci:

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc.
[AMD/ATI] Seymour [Radeon HD 6400M/7400M Series] (prog-if 00 [VGA
controller])
Subsystem: Hewlett-Packard Company Radeon HD 6470M
Flags: bus master, fast devsel, latency 0, IRQ 83
Memory at c0000000 (64-bit, prefetchable) [size=256M]
Memory at d0400000 (64-bit, non-prefetchable) [size=128K]
I/O ports at 2000 [size=256]
Expansion ROM at d0440000 [disabled] [size=128K]
Capabilities: [50] Power Management version 3
Capabilities: [58] Express Legacy Endpoint, MSI 00
Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1
Len=010 <?>
Capabilities: [150] Advanced Error Reporting
Kernel driver in use: radeon

00:05.0 VGA compatible controller: Advanced Micro Devices, Inc.
[AMD/ATI] Seymour [Radeon HD 6400M/7400M Series] (prog-if 00 [VGA
controller])
Subsystem: Hewlett-Packard Company Radeon HD 6470M
Physical Slot: 5
Flags: fast devsel, IRQ 36
Memory at 290000000 (64-bit, prefetchable) [size=256M]
Memory at f1040000 (64-bit, non-prefetchable) [size=128K]
I/O ports at c200 [size=256]
Expansion ROM at f1060000 [disabled] [size=128K]
Capabilities: [50] Power Management version 3
Capabilities: [58] Express Legacy Endpoint, MSI 00
Capabilities: [a0] MSI: Enable- Count=1/1 Maskable- 64bit+

Thanks in advance,
Ghor


_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxx
http://lists.xen.org/xen-users
_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxx
http://lists.xen.org/xen-users


_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxx
http://lists.xen.org/xen-users


_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxx
http://lists.xen.org/xen-users


 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.