[SOLVED] Resizable Bar Woes

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mikeyo

Member
Oct 24, 2022
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Is it possible for AMD GPUs such as the RX6600 or W6600 Pro to work properly in a Windows 11 VM with rebar enabled in the BIOS?
I have an EPYC Asrock SIENAD8-2L2T motherboard and not matter what, I get code 43 every time with rebar enabled. If I disable it, GPU passthrough works fine.
Oddly, when I add the GPU to a Linux VM, passthrough works fine with either rebar enabled or disabled, so go figure. I hope to test my Intel B50 Pro soon so I'm hoping I can leave rebar enabled to get max performance from this card.
 
It's not those GPUs, but rebar works on the RX 9070 XT.

*It is not certain that the same results will be obtained on all computers.

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Post in thread 'GPU Passthrough For Windows 11 Not Working (kvm: vfio: Unable to power on device, stuck in D3)'

I have been using it for several months with the following settings and have not encountered any problems.

Due to a bug in vfio, the latest kernel is required.

It is not necessary to specify vBIOS. Perhaps it is not a ROM that should be specified.
Specifying disable_idle_d3=1 will cause the problem to worsen.

There will be no problems even if you restart or shut down the virtual machine.
When the virtual machine is stopped, amdgpu is used, but when it is started, vfio-pci is used.

・intel (Please do not include unnecessary options)
sed -i '1s/$/ quiet iommu=pt...
Click to expand...
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*2^x (8=256MB)

Code: 
echo 8 > /sys/bus/pci/devices/0000:04:00.0/resource2_resize
 
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