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

[Zir Blazer]

> 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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