lspci -vvv on host: 43:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Vega 10 XL/XT [Radeon RX Vega 56/64] (rev c3) (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. Vega 10 XT [Radeon RX Vega 64] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 64 bytes Interrupt: pin A routed to IRQ 107 NUMA node: 1 Region 0: Memory at 80000000 (64-bit, prefetchable) [size=256M] Region 2: Memory at 90000000 (64-bit, prefetchable) [size=2M] Region 4: I/O ports at 3000 [size=256] Region 5: Memory at 9fe00000 (32-bit, non-prefetchable) [size=512K] Expansion ROM at 9fe80000 [disabled] [size=128K]
lspci -vvv on guest VM: 07:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Vega 10 XT [Radeon RX Vega 64] (rev c3) (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. Vega 10 XL/XT [Radeon RX Vega 56/64] Physical Slot: 0-6 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 64 bytes Interrupt: pin A routed to IRQ 42 Region 0: Memory at 400000000 (64-bit, prefetchable) [size=8G] Region 2: Memory at 300000000 (64-bit, prefetchable) [size=2M] Region 4: I/O ports at d000 [size=256] Region 5: Memory at fdc00000 (32-bit, non-prefetchable) [size=512K] Expansion ROM at fdc80000 [disabled] [size=128K] For "Region 0", why is it "size=8G" in guest, but "size=256M" on host When I try to use the card in the guest, I get errors like: [ 137.290586] amdgpu 0000:07:00.0: [gfxhub] no-retry page fault (src_id:0 ring:158 vmid:8 pasid:32769, for process pid 0 thread pid 0) [ 137.292141] amdgpu 0000:07:00.0: in page starting at address 0x00007f983d952000 from 27 [ 137.293164] amdgpu 0000:07:00.0: VM_L2_PROTECTION_FAULT_STATUS:0x0080093C [ 137.294065] Evicting PASID 32769 queues The same linux kernel 5.1.5 is on the host and the guest. Now, the GPU has 8GB of RAM, but I don't see how the guest memory window can be larger than the host can do. Can anyone help? Kind Regards James
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