[vfio-users] Some questions for passthrough gpu card to windows 7 32bit vm

[yimao]

Thanks Zir,
Could you give me some references for using "-device vfio-pci with
x-vga=on" please?  Can I run this on fedora 25?

2017-03-21 19:01 GMT+08:00 Zir Blazer <zir_blazer at hotmail.com>:
>> Hi,
>> I'm trying to use PCI passthrough to give an NVIDA GPU to a windows vm
>> with qemu-kvm. I have a Windows 7 64bit VM working well under Fedora
>> 25 with an Nvidia GPU GTX 750Ti. But when I tried Windows 7 32bit, the
>> OVMF UEFI could not load the Windows ISO.
>
> Main issue: No 32 Bits Windows supports UEFI Boot. It only supports it in 64
> Bits versions. Use SeaBIOS.
>
>> I have some questions：
>> *. How can I passthrough a GPU card to windows 7 32bit system?
>
> With SeaBIOS, and using -device vfio-pci with x-vga=on. Look for more
> detailed instructions.
>
>
>> *. Is OVMF UEFI firmware necessary for PCI GPU passthrough? I have
>> tried with SeaBIOS, but the gpu card could not start with code 10.
>
> No, but it is the easiest way. Read what VGA Arbitration is.
>
>
>> *. Does the GPU ROM must suppport UEFI?
>
> For Primary VGA Passthrough with UEFI Boot, yes. Legacy VBIOS works for
> SeaBIOS, and every existing Video Card should have it.
> I don't know if GeForces can be used with Secondary VGA Passthrough. That
> means without using the ROM, it gets initialized solely by the Drivers when
> the OS loads.
>
>
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