On 2019-01-30 8:04 a.m., Tobias Geiger wrote: > So it seems - i still suffer from the reset bug, despite the VM being > 100% UEFI and Q35 now.
I probably spoke too early when I said before that the reset issue is fixed by proper PCIe layout. The issue seems to be hardware-related, that there is no PCI quirk in QEMU/vfio_pci to fully reset the GPU using PSP mode1 reset. There is allegedly code in AMDGPU.ko to reset the GPU, but I believe this is related to GPU hang reset, not full GPU / VM reboot reset. Additionally, this code didn't work as advertised for me, last night, when testing in a Linux guest. There is an option to vfio_pci called disable_idle_d3 and when set to Y it will prevent the vfio-bound PCI devices from entering the D3 idle state that the card then gets stuck in. Of course, your card at idle will be consuming about 50-60W more than needed. If I simply start a VFIO guest, the GPU idles at 3 watts. I can reboot as much as I want. Kash
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