KVM/VFIO GVT-g broken on 5.4.0-rc8?
Alex Williamson
alex.williamson at redhat.com
Thu Nov 21 04:35:44 UTC 2019
I was trying to test John Hubbard's latest gup series[1] with GVT-g,
but I'm unable to run a Windows 10 VM with a i915-GVTg_V4_2 on
af42d3466bdc ("Linux 5.4-rc8"). The host kernel prints:
[ 64.402671] gvt: len is not valid: len=11 valid_len=3
[ 64.407932] gvt: vgpu 2: MI_OP_2F handler error
[ 64.412502] gvt: vgpu 2: cmd parser error
[ 64.416591] 0x0
[ 64.416592] 0x2f
[ 64.421930] gvt: vgpu 2: scan wa ctx error
[ 64.426088] GVT Internal error for the guest
[ 64.430486] Now vgpu 2 will enter failsafe mode.
[ 64.435179] gvt: vgpu 2: failed to submit desc 0
[ 64.439853] gvt: vgpu 2: fail submit workload on ring 0
[ 64.445125] gvt: vgpu 2: fail to emulate MMIO write 00002230 len 4
[ 103.522117] gvt: len is not valid: len=11 valid_len=3
[ 103.527419] gvt: vgpu 2: MI_OP_2F handler error
[ 103.532004] gvt: vgpu 2: cmd parser error
[ 103.536062] 0x0
[ 103.536063] 0x2f
[ 103.541342] gvt: vgpu 2: scan wa ctx error
[ 103.545466] GVT Internal error for the guest
[ 103.549863] Now vgpu 2 will enter failsafe mode.
[ 103.554502] gvt: vgpu 2: failed to submit desc 0
[ 103.559156] gvt: vgpu 2: fail submit workload on ring 0
[ 103.564388] gvt: vgpu 2: fail to emulate MMIO write 00002230 len 4
And the VM reboots before reaching the desktop, possibly with a BSOD.
The same VM configuration works on host kernel 5.3.11-200.fc30.x86_64.
Device manager reports HD Graphics 5500 driver version 20.19.15.4624,
which was installed by Windows update. Thanks,
Alex
[1]https://lore.kernel.org/linux-rdma/20191119081643.1866232-1-jhubbard@nvidia.com/T/#t
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