Xen project Mailing List

[Xen-devel] Graphics passthru for dual-GPU cards to two domU's

From: Matthew Hook <matthew.hook@xxxxxxxx>

Date: Mon, 20 Feb 2012 20:58:47 -0800

Authentication-results: mr.google.com; spf=pass (google.com: domain of matthew.hook@xxxxxxxx designates 10.180.92.71 as permitted sender) smtp.mail=matthew.hook@xxxxxxxx

Delivery-date: Tue, 21 Feb 2012 04:59:30 +0000

List-id: Xen developer discussion <xen-devel.lists.xen.org>

Is it possible in Xen that with a dual GPU graphics card which appears as two separately addressable PCI devices to pass each GPU to a separate guest? Although I didn't think this was initially possible, VMWare supports it. It's useful under xen for increasing virtual server density when providing virtual desktops or similar. Although not many Dual GPU cards are on the market at the moment, it seems likely that Dual or Quad GPU cards will become the norm in the near future. For example, I have a number of Dual GPU AMD HD Radeon 6990 card's. I have successfully managed to passthru one of the GPU's on the card with success. However I get a BSOD on the second one. I'm wondering if compiling in the VGA BIOS may help? If so, where is a good resource on how I could do that? Cards show in lspci as follows: 12:00.0 Display controller: ATI Technologies Inc Device 671d 12:00.1 Audio device: ATI Technologies Inc Device aa80 13:00.0 VGA compatible controller: ATI Technologies Inc Device 671d 13:00.1 Audio device: ATI Technologies Inc Device aa80 ATI Technologies Inc Device aa80 +-07.0-[0000:0a-13]----00.0-[0000:0b-13]--+-04.0-[0000:10-13]----00.0-[0000:11-13]--+-04.0-[0000:13]--+-00.0 ATI Technologies Inc Device 671d | | | \-00.1 ATI Technologies Inc Device aa80 | | \-08.0-[0000:12]--+-00.0 ATI Technologies Inc Device 671d | | \-00.1 ATI Technologies Inc Device aa80 More details on the devices themselves. 12:00.0 Display controller: ATI Technologies Inc Device 671d Subsystem: ATI Technologies Inc Device 1b2a 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- Interrupt: pin A routed to IRQ 30 Region 0: Memory at 80000000 (64-bit, prefetchable) [disabled] [size=256M] Region 2: Memory at fb6c0000 (64-bit, non-prefetchable) [disabled] [size=128K] Region 4: I/O ports at 9000 [disabled] [size=256] Expansion ROM at fb6a0000 [disabled] [size=128K] Capabilities: [50] Power Management version 3 Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Capabilities: [58] Express (v2) Legacy Endpoint, MSI 00 DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <4us, L1 unlimited ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset- DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported- RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+ MaxPayload 128 bytes, MaxReadReq 512 bytes DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq+ AuxPwr- TransPend- LnkCap: Port #8, Speed 2.5GT/s, Width x16, ASPM L0s L1, Latency L0 <64ns, L1 <1us ClockPM- Suprise- LLActRep- BwNot- LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk- ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- LnkSta: Speed 2.5GT/s, Width x16, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt- Capabilities: [a0] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable- Address: 0000000000000000 Data: 0000 Capabilities: [100] Vendor Specific Information <?> Capabilities: [150] Advanced Error Reporting <?> Kernel driver in use: pciback 13:00.0 VGA compatible controller: ATI Technologies Inc Device 671d Subsystem: ATI Technologies Inc Device 0b2a 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- Interrupt: pin A routed to IRQ 30 Region 0: Memory at 90000000 (64-bit, prefetchable) [disabled] [size=256M] Region 2: Memory at fb7c0000 (64-bit, non-prefetchable) [disabled] [size=128K] Region 4: I/O ports at a000 [disabled] [size=256] Expansion ROM at fb7a0000 [disabled] [size=128K] Capabilities: [50] Power Management version 3 Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Capabilities: [58] Express (v2) Legacy Endpoint, MSI 00 DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <4us, L1 unlimited ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset- DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported- RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+ MaxPayload 128 bytes, MaxReadReq 512 bytes DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq+ AuxPwr- TransPend- LnkCap: Port #4, Speed 2.5GT/s, Width x16, ASPM L0s L1, Latency L0 <64ns, L1 <1us ClockPM- Suprise- LLActRep- BwNot- LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk- ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- LnkSta: Speed 2.5GT/s, Width x16, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt- Capabilities: [a0] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable- Address: 0000000000000000 Data: 0000 Capabilities: [100] Vendor Specific Information <?> Capabilities: [150] Advanced Error Reporting <?> Kernel driver in use: pciback Matt _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xensource.com/xen-devel

©2013 Xen Project, A Linux Foundation Collaborative Project. All Rights Reserved.
Linux Foundation is a registered trademark of The Linux Foundation.
Xen Project is a trademark of The Linux Foundation.