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

[Jiri 'Ghormoon' Novak <ghormoon@xxxxxxxxx>]

Hi,

what's most different in passing (dom0) primary/secondary gpu except 
that you have to control the dom0 over ssh?
Even after that experiments, I can reconnect the Radeon to the dom0 and 
it works back, so it's possible to init it back somehow.
Ghor

Gordan Bobic wrote:
> 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
> > > >
> > > >
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