Re: VGA passthrough is not working

[Gordan Bobic <gordan@bobich.net>]

Your Nvidia card as a 16GB IOMEM region? I've never an Nvidia card that 
maps more than 256MB. Can qemu (traditional or upstream) even handle this?

Gordan

On 06/09/2014 12:39 PM, Maxim Gordeev wrote:
> Hi!
>
> I have is trouble of VGA passthrough!
> My server: SuperMicro, Motherboard: X9DRG-qf. Latest version BIOS(custom
> BIOS for X9DRG-QF motherboard which set MMIO Base Address to 38BITS)
> CPU: 2xE5-2690v2
> RAM: 64G
> GPU card: PCIe Nvidia Tesla K40(12G Ram)
> OS: Debian 7
> Kernel: 3.14-1-amd64
> HyperVisor: (XEN) Xen version 4.4.1-pre (root@ntc-vulkan.ru) (gcc
> (Debian 4.8.3-2) 4.8.3) debug=n Fri Jun  6 12:56:42 CDT 2014. Also I try
> use version 4.3 from offical repositories.
>
> I trying use passthru GPU card into Virtual Machine, but this is not
> possible...
>> Guest do not start and get me message:
>> pt_pci_write_config: [00:04:0] Warning: Guest attempt to set address
>> to unused Base Address Register. [Offset:14h][Length:4]
>> pt_pci_write_config: Internal error: Invalid write emulation return
>> value[-1]. I/O emulator exit.
> This is Xen 4.4.
>
>
> I try use Xen 4.3 and my VM start, but lspci message:
>  >> Region 0: Memory at c5000000 (32-bit, non-prefetchable) [disabled]
> [size=16M]
>  >> Region 1: Memory at <unassigned> (64-bit, prefetchable) [size=16G]
>  >> Region 3: Memory at 381c00000000 (64-bit, prefetchable) [disabled]
> [size=32M]
>
> Please, look at attach file:
> 1. nvidia-installer.log - xen 4.3
> 2. lspci_itoVM - xen 4.3
> 3. lspci_NVIDIA - xen 4.3 This is lspci output into real hardware
> SuperMicro.
>
>
> BUT! ATI Firepro s10000 is nice work!
>
> Ati is having 6Gb RAm.
>
> k40 work only in 64bit map io PCI
>
>
> Nvidia K40 work only 64bit map io PCI.
> I tried to disable this parametrs in BIOS(Memory Mapped I/O above 4GB).
> But I received of mistake on my server.
>
>
> What is going on?
> Are you have workaround?
> Please, help!
>
> Thanks!
>
> --
> Best regards,Maxim!
>
>
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