XCP-ng
    • Categories
    • Recent
    • Tags
    • Popular
    • Users
    • Groups
    • Register
    • Login

    PCIe Pass-through lanes and lane performance

    Scheduled Pinned Locked Moved Compute
    26 Posts 10 Posters 3.2k Views 8 Watching
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • J Offline
      JamesG @acebmxer
      last edited by

      @acebmxer Supermicro server systems. The Eypc CPU's have 128 lanes of PCIe Gen4. The cards are inserted into appropriate slots.

      I just updated the BIOS and BMC code on the server with the Intel GPU. I went through and re-enabled all the SR-IOV stuff and made sure ReBAR was enabled.

      Still, GPU-Z reports that a Windows guest with the Intel GPU passed-through is linked up with a single lane of PCIe gen 1.

      I suppose that could be cosmetic, however passing through the same Intel GPU to a Debian VM has issues when trying to initialize the card on boot and I can't get it to work there at all. It will at least do something in Windows.

      1 Reply Last reply Reply Quote 0
      • R Offline
        redakula @JamesG
        last edited by

        @JamesG

        The intel Arc GPUs have som weird internal pcie bridge setup that lspci shows only the top of so the actual speed is probably not x1...
        https://www.intel.com/content/www/us/en/support/articles/000094587/graphics.html

        J 1 Reply Last reply Reply Quote 1
        • J Offline
          JamesG @redakula
          last edited by

          @redakula

          First, thanks for chiming in. Second...I'll admit that I'm ignorant here. This is not an area that I have any real experience.

          The Intel doc reference (paraphrasing here) "magic lspci" options that will truly show you that the GPU isn't really running in Gen1x1 and that deeper down, its truly working as intended. I wish they would have just included the super-secret magic lspci options needed to show this is the case...But they didn't.

          The best I can see from lspci -vvxxxx is it still only shows Gen1x1

          00:08.0 VGA compatible controller: Intel Corporation Battlemage G21 [Intel Graphics] (prog-if 00 [VGA controller])
	Subsystem: Intel Corporation Device 1114
	Physical Slot: 8
	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
	Interrupt: pin ? routed to IRQ 79
	Region 0: Memory at f1000000 (64-bit, prefetchable) [size=16M]
	Region 2: Memory at 400000000 (64-bit, prefetchable) [size=16G]
	Expansion ROM at 000c0000 [disabled] [size=128K]
	Capabilities: [40] Vendor Specific Information: Len=0c <?>
	Capabilities: [70] Express (v2) Endpoint, IntMsgNum 0
		DevCap:	MaxPayload 256 bytes, PhantFunc 0, Latency L0s unlimited, L1 unlimited
			ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset- SlotPowerLimit 0W TEE-IO-
		DevCtl:	CorrErr- NonFatalErr- FatalErr- UnsupReq-
			RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop+
			MaxPayload 128 bytes, MaxReadReq 512 bytes
		DevSta:	CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr- TransPend-
		LnkCap:	Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <64ns, L1 <1us
			ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp+
		LnkCtl:	ASPM Disabled; RCB 64 bytes, LnkDisable- CommClk-
			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
		LnkSta:	Speed 2.5GT/s, Width x1
			TrErr- Train- SlotClk- DLActive- BWMgmt- ABWMgmt-
		DevCap2: Completion Timeout: Range B, TimeoutDis+ NROPrPrP- LTR+
			 10BitTagComp+ 10BitTagReq+ OBFF Not Supported, ExtFmt+ EETLPPrefix-
			 EmergencyPowerReduction Not Supported, EmergencyPowerReductionInit-
			 FRS- TPHComp- ExtTPHComp-
			 AtomicOpsCap: 32bit- 64bit- 128bitCAS-
		DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-
			 AtomicOpsCtl: ReqEn-
			 IDOReq- IDOCompl- LTR- EmergencyPowerReductionReq-
			 10BitTagReq- OBFF Disabled, EETLPPrefixBlk-
		LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete- EqualizationPhase1-
			 EqualizationPhase2- EqualizationPhase3- LinkEqualizationRequest-
			 Retimer- 2Retimers- CrosslinkRes: unsupported
	Capabilities: [ac] MSI: Enable+ Count=1/1 Maskable- 64bit+
		Address: 00000000feed7000  Data: 0700
	Capabilities: [d0] 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-
	Kernel driver in use: xe
	Kernel modules: xe
00: 86 80 12 e2 07 04 10 00 00 00 00 03 00 00 00 00
10: 0c 00 00 f1 00 00 00 00 0c 00 00 00 04 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 86 80 14 11
30: 00 00 00 f2 40 00 00 00 00 00 00 00 ff 00 00 00
40: 09 70 0c 01 0b 00 00 00 00 00 00 00 00 00 00 00
50: c0 f9 00 00 00 00 00 00 00 40 00 00 00 00 00 00
60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
70: 10 ac 02 00 e1 8f 00 00 10 29 00 00 11 0c 40 00
80: 00 00 11 00 00 00 00 00 00 00 00 00 00 00 00 00
90: 00 00 00 00 12 08 13 00 00 00 00 00 02 00 00 00
a0: 01 00 00 00 00 00 00 00 00 00 00 00 05 d0 81 00
b0: 00 70 ed fe 00 00 00 00 00 07 00 00 00 00 00 00
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d0: 01 00 03 00 00 00 00 00 00 00 00 00 00 00 00 00
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f0: c7 21 80 ff 03 00 00 00 00 00 00 00 00 00 00 00

          When I ask the system what it thinks the capabilities are, again I get Gen1x1:

          cat /sys/bus/pci/devices/0000:00:08.0/current_link_speed
          2.5 GT/s PCIe
          cat /sys/bus/pci/devices/0000:00:08.0/current_link_width
          1
          cat /sys/bus/pci/devices/0000:00:08.0/max_link_speed
          2.5 GT/s PCIe
          cat /sys/bus/pci/devices/0000:00:08.0/max_link_width
          1

          I know I'm a bit out in uncharted territory here. I don't think XCP-ng supports ReBAR via pass-through (I think that's on the road-map for XenServer9 and maybe XCP-ng 9 as well), current gen GPUs all want ReBAR support, Intel GPU's are in a mostly experimental/developmental mode and might be having a murky future anyway...

          Anyway...From my completely uninformed and ignorant position, it doesn't look like it's negotiating PCIe properly through XCP-ng.

          TeddyAstieT 2 Replies Last reply Reply Quote 0
          • anglerfish27A Offline
            anglerfish27
            last edited by

            Motherboard = ?

            J 1 Reply Last reply Reply Quote 0
            • J Offline
              JamesG @anglerfish27
              last edited by

              @anglerfish27 Supermicro H12SSL-i

              I've dabbled with some PCIe settings, but I'm not really getting anywhere.

              Here's a link to the manual:

              https://www.supermicro.com/manuals/motherboard/EPYC7000/MNL-2314.pdf

              Thanks!

              J 1 Reply Last reply Reply Quote 0
              • J Offline
                john.c @JamesG
                last edited by john.c

                @JamesG said:

                @anglerfish27 Supermicro H12SSL-i

                I've dabbled with some PCIe settings, but I'm not really getting anywhere.

                Here's a link to the manual:

                https://www.supermicro.com/manuals/motherboard/EPYC7000/MNL-2314.pdf

                Thanks!

                Enable the SVM option will initialise the virtualisation settings automatically. As well as the SR-IOV settings, there’s going to other things need doing in XOA, to configure the necessary settings so that GPU can be passed through to the VM.

                J 1 Reply Last reply Reply Quote 0
                • TeddyAstieT Offline
                  TeddyAstie Vates πŸͺ XCP-ng Team Xen Guru @JamesG
                  last edited by TeddyAstie

                  @JamesG

                  I know I'm a bit out in uncharted territory here. I don't think XCP-ng supports ReBAR via pass-through (I think that's on the road-map for XenServer9 and maybe XCP-ng 9 as well), current gen GPUs all want ReBAR support, Intel GPU's are in a mostly experimental/developmental mode and might be having a murky future anyway...

                  XCP-ng guest firmware have a very "legacy" initial BAR placement (i.e thus no explicit support for Resizable BAR, everything below 4G, ...), but the guest operating system can still replace the location of BAR itself if the hardware allows it (in particular Linux will try it, but I'm not sure Windows does).

                  In your case, the GPU VRAM BAR is 16 GB, so it's obviously resized. And according to xe, you should see in dmesg something like BAR2 resized to 16384MiB

                  1 Reply Last reply Reply Quote 0
                  • TeddyAstieT Offline
                    TeddyAstie Vates πŸͺ XCP-ng Team Xen Guru @JamesG
                    last edited by

                    @JamesG said:

                    When I ask the system what it thinks the capabilities are, again I get Gen1x1:

                    cat /sys/bus/pci/devices/0000:00:08.0/current_link_speed
                    2.5 GT/s PCIe
                    cat /sys/bus/pci/devices/0000:00:08.0/current_link_width
                    1
                    cat /sys/bus/pci/devices/0000:00:08.0/max_link_speed
                    2.5 GT/s PCIe
                    cat /sys/bus/pci/devices/0000:00:08.0/max_link_width
                    1

                    This information is actually crafted by QEMU, it doesn't represent the actual real device PCI state; you should check this from Dom0 which should be closer to reality.

                    J 1 Reply Last reply Reply Quote 1
                    • J Offline
                      JamesG @john.c
                      last edited by

                      @john.c

                      Yes indeed. SVM has been enabled as well as SR-IOV and IOMMU.

                      That should be all good for full virtualization and support pass-through and SR-IOV features.

                      1 Reply Last reply Reply Quote 0
                      • J Offline
                        JamesG @TeddyAstie
                        last edited by

                        @TeddyAstie

                        I haven't cleared the PCI pass-through masking in Dom0, but below is the same lspci command from Dom0. I'm pretty sure I'm running the latest 8.3 with all the current patches. This could just be a kernel issue?

                        lspci -vvxxxx -s 0000:83:00.0
83:00.0 VGA compatible controller: Intel Corporation Device e212 (prog-if 00 [VGA controller])
	Subsystem: Intel Corporation Device 1114
	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-
	Region 0: Memory at 20002000000 (64-bit, prefetchable) [disabled] [size=16M]
	Region 2: Memory at 1f800000000 (64-bit, prefetchable) [disabled] [size=16G]
	Expansion ROM at f7c00000 [disabled] [size=2M]
	Capabilities: [40] Vendor Specific Information: Len=0c <?>
	Capabilities: [70] Express (v2) Endpoint, MSI 00
		DevCap:	MaxPayload 256 bytes, PhantFunc 0, Latency L0s unlimited, L1 unlimited
			ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset+ SlotPowerLimit 0.000W
		DevCtl:	Report errors: Correctable+ Non-Fatal+ Fatal+ Unsupported-
			RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop+ FLReset-
			MaxPayload 256 bytes, MaxReadReq 512 bytes
		DevSta:	CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
		LnkCap:	Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <64ns, L1 <1us
			ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp+
		LnkCtl:	ASPM Disabled; RCB 64 bytes Disabled- CommClk-
			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
		LnkSta:	Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk- DLActive- BWMgmt- ABWMgmt-
		DevCap2: Completion Timeout: Range B, 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: [ac] MSI: Enable- Count=1/1 Maskable+ 64bit+
		Address: 0000000000000000  Data: 0000
		Masking: 00000000  Pending: 00000000
	Capabilities: [d0] 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: [100 v1] Alternative Routing-ID Interpretation (ARI)
		ARICap:	MFVC- ACS-, Next Function: 0
		ARICtl:	MFVC- ACS-, Function Group: 0
	Capabilities: [110 v1] #00
	Capabilities: [200 v1] Address Translation Service (ATS)
		ATSCap:	Invalidate Queue Depth: 00
		ATSCtl:	Enable-, Smallest Translation Unit: 00
	Capabilities: [420 v1] #15
	Capabilities: [220 v1] #24
	Capabilities: [320 v1] Single Root I/O Virtualization (SR-IOV)
		IOVCap:	Migration-, Interrupt Message Number: 000
		IOVCtl:	Enable- Migration- Interrupt- MSE- ARIHierarchy+
		IOVSta:	Migration-
		Initial VFs: 2, Total VFs: 2, Number of VFs: 0, Function Dependency Link: 00
		VF offset: 1, stride: 1, Device ID: e212
		Supported Page Size: 00000553, System Page Size: 00000001
		Region 0: Memory at 0000020000000000 (64-bit, prefetchable)
		Region 2: Memory at 000001fc00000000 (64-bit, prefetchable)
		VF Migration: offset: 00000000, BIR: 0
	Capabilities: [400 v1] Latency Tolerance Reporting
		Max snoop latency: 0ns
		Max no snoop latency: 0ns
	Kernel driver in use: pciback
00: 86 80 12 e2 00 00 10 00 00 00 00 03 10 00 00 00
10: 0c 00 00 02 00 02 00 00 0c 00 00 00 f8 01 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 86 80 14 11
30: 00 00 c0 f7 40 00 00 00 00 00 00 00 ff 00 00 00
40: 09 70 0c 01 0b 00 00 00 00 00 00 00 00 00 00 00
50: c0 f9 00 00 00 00 00 00 00 40 00 00 00 00 00 00
60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
70: 10 ac 02 00 e1 8f 00 10 37 29 00 00 11 0c 40 00
80: 00 00 11 00 00 00 00 00 00 00 00 00 00 00 00 00
90: 00 00 00 00 12 08 13 00 00 10 00 00 02 00 00 00
a0: 00 00 00 00 00 00 00 00 00 00 00 00 05 d0 80 01
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d0: 01 00 03 48 08 00 00 00 00 00 00 00 00 00 00 00
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f0: c7 21 80 ff 03 00 00 00 00 00 00 00 00 00 00 00
100: 0e 00 01 11 00 00 00 00 00 00 00 00 00 00 00 00
110: 00 00 01 20 00 14 00 00 00 00 00 00 00 00 00 00
120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
150: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
160: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
170: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
190: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
200: 0f 00 01 42 20 00 00 00 00 00 00 00 00 00 00 00
210: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
220: 24 00 01 32 00 f0 07 00 22 0d 00 00 00 00 00 00
230: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
240: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
250: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
260: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
270: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
290: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
2a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
2b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
2c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
2d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
2e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
2f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
300: 13 00 01 32 00 00 00 81 00 80 00 00 00 00 00 00
310: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
320: 10 00 01 40 06 00 00 00 10 00 00 00 02 00 02 00
330: 00 00 00 00 01 00 01 00 00 00 12 e2 53 05 00 00
340: 01 00 00 00 0c 00 00 00 00 02 00 00 0c 00 00 00
350: fc 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00
360: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
370: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
390: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
3a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
3b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
3c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
3d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
3e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
3f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
400: 18 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00
410: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
420: 15 00 01 22 00 f0 07 00 22 0e 00 00 00 00 00 00
430: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
440: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
450: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
460: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
470: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
490: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
4a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
4b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
4c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
4d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
4e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
4f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
510: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
520: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
530: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
540: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
550: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
560: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
570: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
590: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
5a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
5b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
5c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
5d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
5e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
5f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
610: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
620: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
630: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
640: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
650: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
660: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
670: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
690: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
6a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
6b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
6c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
6d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
6e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
6f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
710: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
720: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
730: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
740: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
750: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
760: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
770: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
790: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
7a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
7b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
7c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
7d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
7e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
7f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
810: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
820: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
830: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
840: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
850: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
860: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
870: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
890: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
8a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
8b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
8c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
8d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
8e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
8f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
910: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
920: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
930: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
940: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
950: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
960: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
970: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
990: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
9a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
9b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
9c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
9d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
9e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
9f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
a10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
a20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
a30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
a40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
a50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
a60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
a70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
a90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
aa0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ab0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ac0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ad0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ae0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
af0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ba0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
bb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
bc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
bd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
be0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
bf0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ca0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
cb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
cc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
cd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ce0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
cf0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
da0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
db0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
dc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
dd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
de0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
df0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ea0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
eb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ec0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ed0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ee0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ef0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
fa0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
fb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                        J 1 Reply Last reply Reply Quote 0
                        • J Offline
                          JamesG @JamesG
                          last edited by

                          Not to be a nuisance...But just curious if there are other thoughts on this.

                          1 Reply Last reply Reply Quote 0
                          • TeddyAstieT Offline
                            TeddyAstie Vates πŸͺ XCP-ng Team Xen Guru
                            last edited by

                            @JamesG Can you try having a workload on the GPU (and also checking if the performance is lower, or if it's just display) ?

                            1 Reply Last reply Reply Quote 0
                            • M Offline
                              MajorP93
                              last edited by MajorP93

                              Hello!
                              Just an idea but maybe the PCI link speed you are seeing is related to some sort of energy saving feature?
                              Background: I have a Nvidia GPU in my PC and when there is no load the PCIe speed is lowered from PCIe 4.0 to 1.1 due to energy saving feature.

                              fbd06c41-50cb-4334-9c98-92a3b6573389-image.jpeg

                              So yeah, I think @teddyastie 's idea is a good approach here. Try how your setup behaves during a workload.

                              R 1 Reply Last reply Reply Quote 0
                              • R Offline
                                redakula @MajorP93
                                last edited by

                                @MajorP93

                                I spent quite some time on this when i first got an Arc card and all research i found points to Linux reporting the top of the PCIE chain only. The card has an internal bridge.

                                The only tool i found that reports the correct info is GPU-Z which is unfortunately windows only.

                                My A310 which also reports PCIE x 1 in linux reports the correct link speed in GPU-Z (It is in a X4 slot so that is why it is not showing the X8 that the card is...)

                                02f9582c-2d6c-4647-92ba-6b999c3b436f-image.jpeg

                                1 Reply Last reply Reply Quote 0
                                • J Offline
                                  john.c
                                  last edited by john.c

                                  Is there anything mentioned in the motherboard or service manuals, about where if one PCIe slot is occupied another is running at reduced speed when occupied?

                                  Something like this is in the manual for a Gigabyte B450 Aorus Elite (Rev 1.0) motherboard, for example. Can be in yours, somewhere written on one of its pages.

                                  J 1 Reply Last reply Reply Quote 0
                                  • J Offline
                                    JamesG @john.c
                                    last edited by

                                    So I ordered some mini DP dummy plugs and took a look at this further today.

                                    First thought...Just load Windows on the bare metal and see what the card does.

                                    No problem. Loaded Win10, loaded the latest drivers, PCIe Gen4x8 lanes. Sweet. At least that works.

                                    Put the XCP-ng drive back in, booted up, passed-through the GPU to a Win11 guest, updated the drivers, PCIe Gen1x1.

                                    Ultimately I need to install a Linux distro with a really current kernel on the bare metal and see how it sees the GPU. That might be a good project for tomorrow.

                                    I think this just comes down to a combination of too new, not well supported hardware with some quirks and somewhat dated code and support in XCP-ng (ReBAR support in guests for example).

                                    @redakula Is that GPU-z screenshot from a Windows guest VM with the A310 passed through?

                                    Y TeddyAstieT 2 Replies Last reply Reply Quote 0
                                    • Y Offline
                                      yannsionneau Vates πŸͺ XCP-ng Team @JamesG
                                      last edited by

                                      Maybe let's ping the entire @Team-Hypervisor-Kernel here πŸ™‚

                                      J 1 Reply Last reply Reply Quote 0
                                      • J Offline
                                        JamesG @yannsionneau
                                        last edited by

                                        @yannsionneau I appreciate that. I will gladly provide access to the hardware if anybody in development wants to dig in and see what's going on.

                                        1 Reply Last reply Reply Quote 0
                                        • TeddyAstieT Offline
                                          TeddyAstie Vates πŸͺ XCP-ng Team Xen Guru @JamesG
                                          last edited by TeddyAstie

                                          @JamesG said:

                                          So I ordered some mini DP dummy plugs and took a look at this further today.

                                          First thought...Just load Windows on the bare metal and see what the card does.

                                          No problem. Loaded Win10, loaded the latest drivers, PCIe Gen4x8 lanes. Sweet. At least that works.

                                          Put the XCP-ng drive back in, booted up, passed-through the GPU to a Win11 guest, updated the drivers, PCIe Gen1x1.

                                          As I explained briefly in https://xcp-ng.org/forum/post/106479, this is mostly display as the real hardware may be running at a different speed.

                                          Ultimately I need to install a Linux distro with a really current kernel on the bare metal and see how it sees the GPU. That might be a good project for tomorrow.

                                          I think this just comes down to a combination of too new, not well supported hardware with some quirks and somewhat dated code and support in XCP-ng (ReBAR support in guests for example).

                                          I did quick checks and I believe that ReBAR works; at least with UEFI guests (our OVMF build does support resizable bar), and it actually works as suggest https://xcp-ng.org/forum/post/106489 (VRAM BAR is 16 GB); but I didn't do extensive testing in that area.

                                          J 1 Reply Last reply Reply Quote 0
                                          • J Offline
                                            JamesG @TeddyAstie
                                            last edited by

                                            Alright....I might be seeing something here...From the CLI of the XCP-ng host itself...

                                            Here's the lspci tree view of interest:

                                             +-[0000:80]-+-00.0  Advanced Micro Devices, Inc. [AMD] Starship/Matisse Root Complex
 |           +-00.2  Advanced Micro Devices, Inc. [AMD] Starship/Matisse IOMMU
 |           +-01.0  Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Host Bridge
 |           +-01.1-[81-84]----00.0-[82-84]--+-01.0-[83]----00.0  Intel Corporation Device e212
 |           |                               \-02.0-[84]----00.0  Intel Corporation Device e2f7

                                            So PCI slots 81-84 are what I'm interested in...Digging in on 81:

                                            lspci -vv -s 0000:81:00.0
81:00.0 PCI bridge: Intel Corporation Device e2ff (rev 01) (prog-if 00 [Normal decode])
        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 56
        Region 0: Memory at 20003000000 (64-bit, prefetchable) [size=8M]
        Bus: primary=81, secondary=82, subordinate=84, sec-latency=0
        Memory behind bridge: f7c00000-f7efffff
        Prefetchable memory behind bridge: 000001f800000000-0000020002ffffff
        Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
        BridgeCtl: Parity- SERR+ NoISA- VGA- MAbort- >Reset- FastB2B-
                PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
        Capabilities: [40] Power Management version 3
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
                Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [50] MSI: Enable- Count=1/1 Maskable+ 64bit+
                Address: 0000000000000000  Data: 0000
                Masking: 00000000  Pending: 00000000
        Capabilities: [70] Express (v2) Upstream Port, MSI 00
                DevCap: MaxPayload 256 bytes, PhantFunc 0
                        ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ SlotPowerLimit 75.000W
                DevCtl: Report errors: Correctable- Non-Fatal- Fatal+ Unsupported-
                        RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop-
                        MaxPayload 256 bytes, MaxReadReq 512 bytes
                DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq+ AuxPwr+ TransPend-
                LnkCap: Port #0, Speed unknown, Width x8, ASPM L1, Exit Latency L0s <4us, L1 <32us
                        ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
                LnkCtl: ASPM Disabled; Disabled- CommClk+
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 16GT/s, Width x8, 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: Unknown, EnterCompliance- SpeedDis-
                         Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
                         Compliance De-emphasis: -6dB
                LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete+, EqualizationPhase1+
                         EqualizationPhase2+, EqualizationPhase3+, LinkEqualizationRequest-
        Capabilities: [100 v2] 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-
        Capabilities: [158 v1] #19
        Capabilities: [178 v1] #26
        Capabilities: [1a0 v1] #27
        Capabilities: [1c8 v1] #2a
        Capabilities: [1fc v1] Latency Tolerance Reporting
                Max snoop latency: 0ns
                Max no snoop latency: 0ns
        Capabilities: [204 v1] L1 PM Substates
                L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+
                          PortCommonModeRestoreTime=10us PortTPowerOnTime=14us
        Capabilities: [220 v1] Vendor Specific Information: ID=0002 Rev=4 Len=100 <?>
        Capabilities: [320 v1] Vendor Specific Information: ID=0001 Rev=1 Len=038 <?>
        Capabilities: [358 v1] #25
        Kernel driver in use: pcieport

                                            Specifically there I see the correct width and speed of the PCIe interface for the card.

                                            Nothing shows up for 82 (I presume that's a bridge to get to the functions on the card)

                                            83 is the actual graphics processor itself:

                                            lspci -vv -s 0000:83:00.0
83:00.0 VGA compatible controller: Intel Corporation Device e212 (prog-if 00 [VGA controller])
        Subsystem: Intel Corporation Device 1114
        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-
        Region 0: Memory at 20002000000 (64-bit, prefetchable) [disabled] [size=16M]
        Region 2: Memory at 1f800000000 (64-bit, prefetchable) [disabled] [size=16G]
        Expansion ROM at f7c00000 [disabled] [size=2M]
        Capabilities: [40] Vendor Specific Information: Len=0c <?>
        Capabilities: [70] Express (v2) Endpoint, MSI 00
                DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s unlimited, L1 unlimited
                        ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset+ SlotPowerLimit 0.000W
                DevCtl: Report errors: Correctable- Non-Fatal- Fatal+ Unsupported-
                        RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop+ FLReset-
                        MaxPayload 256 bytes, MaxReadReq 512 bytes
                DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
                LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <64ns, L1 <1us
                        ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp+
                LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk-
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk- DLActive- BWMgmt- ABWMgmt-
                DevCap2: Completion Timeout: Range B, 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: [ac] MSI: Enable- Count=1/1 Maskable+ 64bit+
                Address: 0000000000000000  Data: 0000
                Masking: 00000000  Pending: 00000000
        Capabilities: [d0] 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: [100 v1] Alternative Routing-ID Interpretation (ARI)
                ARICap: MFVC- ACS-, Next Function: 0
                ARICtl: MFVC- ACS-, Function Group: 0
        Capabilities: [110 v1] #00
        Capabilities: [200 v1] Address Translation Service (ATS)
                ATSCap: Invalidate Queue Depth: 00
                ATSCtl: Enable-, Smallest Translation Unit: 00
        Capabilities: [420 v1] #15
        Capabilities: [220 v1] #24
        Capabilities: [320 v1] Single Root I/O Virtualization (SR-IOV)
                IOVCap: Migration-, Interrupt Message Number: 000
                IOVCtl: Enable- Migration- Interrupt- MSE- ARIHierarchy+
                IOVSta: Migration-
                Initial VFs: 2, Total VFs: 2, Number of VFs: 0, Function Dependency Link: 00
                VF offset: 1, stride: 1, Device ID: e212
                Supported Page Size: 00000553, System Page Size: 00000001
                Region 0: Memory at 0000020000000000 (64-bit, prefetchable)
                Region 2: Memory at 000001fc00000000 (64-bit, prefetchable)
                VF Migration: offset: 00000000, BIR: 0
        Capabilities: [400 v1] Latency Tolerance Reporting
                Max snoop latency: 0ns
                Max no snoop latency: 0ns
        Kernel driver in use: pciback

                                            And 84 is the audio portion of the GPU...

                                            lspci -vv -s 0000:84:00.0
84:00.0 Audio device: Intel Corporation Device e2f7
        Subsystem: Intel Corporation Device 1114
        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-
        Region 0: Memory at f7e00000 (64-bit, non-prefetchable) [disabled] [size=16K]
        Capabilities: [50] Power Management version 3
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=55mA PME(D0-,D1-,D2-,D3hot+,D3cold+)
                Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [c0] Vendor Specific Information: Len=14 <?>
        Capabilities: [60] MSI: Enable- Count=1/1 Maskable- 64bit+
                Address: 0000000000000000  Data: 0000
        Capabilities: [80] Express (v2) Endpoint, MSI 00
                DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <4us, L1 unlimited
                        ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset+ SlotPowerLimit 0.000W
                DevCtl: Report errors: Correctable- Non-Fatal- Fatal+ Unsupported-
                        RlxdOrd- ExtTag+ PhantFunc- AuxPwr- NoSnoop+ FLReset-
                        MaxPayload 256 bytes, MaxReadReq 512 bytes
                DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
                LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <64ns, L1 <1us
                        ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp+
                LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 2.5GT/s, Width x1, 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: [100 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: 1f, GenCap- CGenEn- ChkCap- ChkEn-
        Capabilities: [140 v1] Latency Tolerance Reporting
                Max snoop latency: 0ns
                Max no snoop latency: 0ns

                                            As far as XO (from sources) is concerned, I can turn on pass-through for 83, but it doesn't show me 81, 82, or 84.

                                            Should I just manually block off 81-84 and pass all of those devices to the guest VM?

                                            J 1 Reply Last reply Reply Quote 0

                                            Hello! It looks like you're interested in this conversation, but you don't have an account yet.

                                            Getting fed up of having to scroll through the same posts each visit? When you register for an account, you'll always come back to exactly where you were before, and choose to be notified of new replies (either via email, or push notification). You'll also be able to save bookmarks and upvote posts to show your appreciation to other community members.

                                            With your input, this post could be even better πŸ’—

                                            Register Login
                                            • First post
                                              Last post