* [Qemu-devel] VFIO VGA passthrough
@ 2012-11-20 11:47 ching
2012-11-20 15:27 ` Alex Williamson
0 siblings, 1 reply; 4+ messages in thread
From: ching @ 2012-11-20 11:47 UTC (permalink / raw)
To: qemu-devel
My PC is gentoo x64, kernel 3.6.6, intel sandy bridge i7 2600 + asrock Z77 exterme 4 MB
I download qemu from git and try to pass through secondary VGA card to Windows 7 x64 SP1 VM:
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Cayman PRO [Radeon HD 6950] (prog-if 00 [VGA controller])
Subsystem: XFX Pine Group Inc. Device 3125
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 11
Region 0: Memory at d0000000 (64-bit, prefetchable) [disabled] [size=256M]
Region 2: Memory at f4b20000 (64-bit, non-prefetchable) [disabled] [size=128K]
Region 4: I/O ports at e000 [disabled] [size=256]
Expansion ROM at f4b00000 [disabled] [size=128K]
Capabilities: [50] Power Management version 3
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [58] Express (v2) Legacy Endp5. grant oint, 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 #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Latency L0 <64ns, L1 <1us
ClockPM- Surprise- 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-
DevCap2: Completion Timeout: Not Supported, TimeoutDis-, LTR-, OBFF Not Supported
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled
LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-
Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete-, EqualizationPhase1-
EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
Capabilities: [a0] MSI: Enable- Count=1/1 Maskable- 64bit+
Address: 0000000000000000 Data: 0000
Capabilities: [100 v1] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
Capabilities: [150 v1] Advanced Error Reporting
UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
CESta: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
AERCap: First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn-
Kernel driver in use: vfio-pci
01:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Cayman/Antilles HDMI Audio [Radeon HD 6900 Series]
Subsystem: XFX Pine Group Inc. Device aa80
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 B routed to IRQ 105. grant
Region 0: Memory at f4b40000 (64-bit, non-prefetchable) [disabled] [size=16K]
Capabilities: [50] Power Management version 3
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 NoSoftRst- 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 #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Latency L0 <64ns, L1 <1us
ClockPM- Surprise- 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-
DevCap2: Completion Timeout: Not Supported, TimeoutDis-, LTR-, OBFF Not Supported
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled
LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete-, EqualizationPhase1-
EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
Capabilities: [a0] MSI: Enable- Count=1/1 Maskable- 64bit+
Address: 0000000000000000 Data: 0000
Capabilities: [100 v1] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
Capabilities: [150 v1] Advanced Error Reporting
UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
CESta: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
AERCap: First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn-
Kernel driver in use: vfio-pci
i google related threads and carried out preparation:
1. set module parameter "vfio_iommu_type1.allow_unsafe_interrupts"=1
2. raise ulimit: ulimit -l unlimited
3. compile kernel without swap memory support, ATI KMS, alsa for ATI if any
4. compile xorg without ati, vesa driver
But the guest boots with BSOD and qemu shows the following messages, can anyone helps?
for dev in $(ls /sys/bus/pci/devices/0000:01:00.0/iommu_group/devices); do
vendor=$(cat /sys/bus/pci/devices/$dev/vendor)
device=$(cat /sys/bus/pci/devices/$dev/device)
if [ -e /sys/bus/pci/devices/$dev/driver ]; then
echo $dev > /sys/bus/pci/devices/$dev/driver/unbind
fi
echo $vendor $device > /sys/bus/pci/drivers/vfio-pci/new_id
done
# qemu-system-x86_64 \
> -runas zvm \
> -name Windows -M pc-1.3 -enable-kvm \
> -cpu SandyBridge,+osxsave,+pcid,+pdcm,+xtpr,+tm2,+est,+smx,+vmx,+ds_cpl,+monitor,+dtes64,+pbe,+tm,+ht,+ss,+acpi,+ds,+vme \
> -m 8192 -smp 2,sockets=2,cores=1,threads=1 \
> -rtc base=utc,driftfix=slew \
> -net nic,model=virtio -net user \
> -drive file=/custom/vm/image/Temp.raw_image,if=virtio,format=raw,cache=unsafe,aio=native \
> -device vfio-pci,host=0000:01:00.0 \
> -device vfio-pci,host=0000:01:00.1 \
> -vga cirrus
qemu-system-x86_64: -device vfio-pci,host=0000:01:00.0: Warning, device 0000:01:00.0 does not support reset
qemu-system-x86_64: -device vfio-pci,host=0000:01:00.1: Warning, device 0000:01:00.1 does not support reset
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [Qemu-devel] VFIO VGA passthrough 2012-11-20 11:47 [Qemu-devel] VFIO VGA passthrough ching @ 2012-11-20 15:27 ` Alex Williamson 2012-11-21 11:56 ` ching 0 siblings, 1 reply; 4+ messages in thread From: Alex Williamson @ 2012-11-20 15:27 UTC (permalink / raw) To: ching; +Cc: qemu-devel On Tue, 2012-11-20 at 19:47 +0800, ching wrote: > My PC is gentoo x64, kernel 3.6.6, intel sandy bridge i7 2600 + asrock Z77 exterme 4 MB > > I download qemu from git and try to pass through secondary VGA card to Windows 7 x64 SP1 VM: > > > 01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Cayman PRO [Radeon HD 6950] (prog-if 00 [VGA controller]) > Subsystem: XFX Pine Group Inc. Device 3125 > 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 11 > Region 0: Memory at d0000000 (64-bit, prefetchable) [disabled] [size=256M] > Region 2: Memory at f4b20000 (64-bit, non-prefetchable) [disabled] [size=128K] > Region 4: I/O ports at e000 [disabled] [size=256] > Expansion ROM at f4b00000 [disabled] [size=128K] > Capabilities: [50] Power Management version 3 > Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) > Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME- > Capabilities: [58] Express (v2) Legacy Endp5. grant oint, 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 #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Latency L0 <64ns, L1 <1us > ClockPM- Surprise- 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- > DevCap2: Completion Timeout: Not Supported, TimeoutDis-, LTR-, OBFF Not Supported > DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled > LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis- > Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS- > Compliance De-emphasis: -6dB > LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete-, EqualizationPhase1- > EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest- > Capabilities: [a0] MSI: Enable- Count=1/1 Maskable- 64bit+ > Address: 0000000000000000 Data: 0000 > Capabilities: [100 v1] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?> > Capabilities: [150 v1] Advanced Error Reporting > UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol- > UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol- > UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol- > CESta: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+ > CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+ > AERCap: First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn- > Kernel driver in use: vfio-pci > > 01:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Cayman/Antilles HDMI Audio [Radeon HD 6900 Series] > Subsystem: XFX Pine Group Inc. Device aa80 > 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 B routed to IRQ 105. grant > Region 0: Memory at f4b40000 (64-bit, non-prefetchable) [disabled] [size=16K] > Capabilities: [50] Power Management version 3 > Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) > Status: D0 NoSoftRst- 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 #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Latency L0 <64ns, L1 <1us > ClockPM- Surprise- 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- > DevCap2: Completion Timeout: Not Supported, TimeoutDis-, LTR-, OBFF Not Supported > DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled > LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete-, EqualizationPhase1- > EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest- > Capabilities: [a0] MSI: Enable- Count=1/1 Maskable- 64bit+ > Address: 0000000000000000 Data: 0000 > Capabilities: [100 v1] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?> > Capabilities: [150 v1] Advanced Error Reporting > UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol- > UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol- > UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol- > CESta: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+ > CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+ > AERCap: First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn- > Kernel driver in use: vfio-pci > > > > > i google related threads and carried out preparation: > 1. set module parameter "vfio_iommu_type1.allow_unsafe_interrupts"=1 > 2. raise ulimit: ulimit -l unlimited > 3. compile kernel without swap memory support, ATI KMS, alsa for ATI if any > 4. compile xorg without ati, vesa driver > > > > But the guest boots with BSOD and qemu shows the following messages, can anyone helps? Getting VGA to work in a guest is mostly black magic and luck at this point. The warning you're getting isn't preventing anything. We use device reset to try to clear the state of the hardware between runs. If it's not available we can potentially leak data through the device and may see issues with reproducibility since we can't return the device to a known state. The assigned VGA device should not be used for anything on the host, which it seems like you've taken care of. The host shouldn't even have a blinking cursor on the display. It's been reported that "-cpu host" helps, but that's possibly very similar to what you specify below. When I tested secondary VGA with an ATI card I used "-vga std" and I made the devices appear as multifunction in the guest, ex: -device vfio-pci,host=1:00.0,multifunction=on,addr=4.0 \ -device vfio-pci,host=1:00.1,addr=4.1 I also first booted without the AMD Catalyst driver installed. The assigned devices are unused, but the guest still boots. Then installed the Catalyst driver, after which rebooting causes the std VGA to go blank after an initial startup screen and Windows uses the assigned device exclusively. Good luck, there's obviously still work to do in this space. Thanks, Alex > for dev in $(ls /sys/bus/pci/devices/0000:01:00.0/iommu_group/devices); do > vendor=$(cat /sys/bus/pci/devices/$dev/vendor) > device=$(cat /sys/bus/pci/devices/$dev/device) > if [ -e /sys/bus/pci/devices/$dev/driver ]; then > echo $dev > /sys/bus/pci/devices/$dev/driver/unbind > fi > echo $vendor $device > /sys/bus/pci/drivers/vfio-pci/new_id > done > > # qemu-system-x86_64 \ > > -runas zvm \ > > -name Windows -M pc-1.3 -enable-kvm \ > > -cpu SandyBridge,+osxsave,+pcid,+pdcm,+xtpr,+tm2,+est,+smx,+vmx,+ds_cpl,+monitor,+dtes64,+pbe,+tm,+ht,+ss,+acpi,+ds,+vme \ > > -m 8192 -smp 2,sockets=2,cores=1,threads=1 \ > > -rtc base=utc,driftfix=slew \ > > -net nic,model=virtio -net user \ > > -drive file=/custom/vm/image/Temp.raw_image,if=virtio,format=raw,cache=unsafe,aio=native \ > > -device vfio-pci,host=0000:01:00.0 \ > > -device vfio-pci,host=0000:01:00.1 \ > > -vga cirrus > qemu-system-x86_64: -device vfio-pci,host=0000:01:00.0: Warning, device 0000:01:00.0 does not support reset > > qemu-system-x86_64: -device vfio-pci,host=0000:01:00.1: Warning, device 0000:01:00.1 does not support reset > > ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [Qemu-devel] VFIO VGA passthrough 2012-11-20 15:27 ` Alex Williamson @ 2012-11-21 11:56 ` ching 2012-11-21 14:54 ` Alex Williamson 0 siblings, 1 reply; 4+ messages in thread From: ching @ 2012-11-21 11:56 UTC (permalink / raw) To: Alex Williamson; +Cc: qemu-devel On 11/20/2012 11:27 PM, Alex Williamson wrote: > > Getting VGA to work in a guest is mostly black magic and luck at this > point. The warning you're getting isn't preventing anything. We use > device reset to try to clear the state of the hardware between runs. If > it's not available we can potentially leak data through the device and > may see issues with reproducibility since we can't return the device to > a known state. > > The assigned VGA device should not be used for anything on the host, > which it seems like you've taken care of. The host shouldn't even have > a blinking cursor on the display. > > It's been reported that "-cpu host" helps, but that's possibly very > similar to what you specify below. When I tested secondary VGA with an > ATI card I used "-vga std" and I made the devices appear as > multifunction in the guest, ex: > > -device vfio-pci,host=1:00.0,multifunction=on,addr=4.0 \ > -device vfio-pci,host=1:00.1,addr=4.1 > > I also first booted without the AMD Catalyst driver installed. The > assigned devices are unused, but the guest still boots. Then installed > the Catalyst driver, after which rebooting causes the std VGA to go > blank after an initial startup screen and Windows uses the assigned > device exclusively. Good luck, there's obviously still work to do in > this space. Thanks, > > Alex > > > > i am new in pci passthrough has a few more question: 1. is your vga card a PCI Express card? 2. there is a pci bridge in the same iommu group, do i need to pass to the guest? 00:01.0 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port (rev 09) 3. do i need to dump the vga bios and pass it to guest? Thanks in advance ching ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [Qemu-devel] VFIO VGA passthrough 2012-11-21 11:56 ` ching @ 2012-11-21 14:54 ` Alex Williamson 0 siblings, 0 replies; 4+ messages in thread From: Alex Williamson @ 2012-11-21 14:54 UTC (permalink / raw) To: ching; +Cc: qemu-devel On Wed, 2012-11-21 at 19:56 +0800, ching wrote: > On 11/20/2012 11:27 PM, Alex Williamson wrote: > > > > Getting VGA to work in a guest is mostly black magic and luck at this > > point. The warning you're getting isn't preventing anything. We use > > device reset to try to clear the state of the hardware between runs. If > > it's not available we can potentially leak data through the device and > > may see issues with reproducibility since we can't return the device to > > a known state. > > > > The assigned VGA device should not be used for anything on the host, > > which it seems like you've taken care of. The host shouldn't even have > > a blinking cursor on the display. > > > > It's been reported that "-cpu host" helps, but that's possibly very > > similar to what you specify below. When I tested secondary VGA with an > > ATI card I used "-vga std" and I made the devices appear as > > multifunction in the guest, ex: > > > > -device vfio-pci,host=1:00.0,multifunction=on,addr=4.0 \ > > -device vfio-pci,host=1:00.1,addr=4.1 > > > > I also first booted without the AMD Catalyst driver installed. The > > assigned devices are unused, but the guest still boots. Then installed > > the Catalyst driver, after which rebooting causes the std VGA to go > > blank after an initial startup screen and Windows uses the assigned > > device exclusively. Good luck, there's obviously still work to do in > > this space. Thanks, > > > > Alex > > > > > > > > > > i am new in pci passthrough has a few more question: > > 1. is your vga card a PCI Express card? Yes > 2. there is a pci bridge in the same iommu group, do i need to pass to the guest? > > 00:01.0 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port (rev 09) No, though it's possible that using the new Q35 chipset model and matching the topology of the devices in the guest (ie. both below an emulated root port) may help. > 3. do i need to dump the vga bios and pass it to guest? Typically not for ATI/AMD cards. If you can read the "rom" file in /sys/bus/pci/devices/xxx/rom (where xxx is your device, ex 0000:01:00.0) then dumping the rom likely won't help. Thanks, Alex ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2012-11-21 14:55 UTC | newest] Thread overview: 4+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2012-11-20 11:47 [Qemu-devel] VFIO VGA passthrough ching 2012-11-20 15:27 ` Alex Williamson 2012-11-21 11:56 ` ching 2012-11-21 14:54 ` Alex Williamson
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