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    Coral TPU PCI Passthrough

    Scheduled Pinned Locked Moved Compute
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    • L Offline
      logical.systems @olivierlambert
      last edited by

      @olivierlambert I saw that post in my initial search but it doesn't look like the OP replied with the PCI dump. Is there any hope for a workaround?

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      • olivierlambertO Offline
        olivierlambert Vates 🪐 Co-Founder CEO
        last edited by

        You can continue here to provide details, maybe we'll see something obvious 🙂

        L 1 Reply Last reply Reply Quote 0
        • L Offline
          logical.systems @olivierlambert
          last edited by

          @olivierlambert Aside from the dump in my original post would you like me to run any additional commands to gather more data?

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          • olivierlambertO Offline
            olivierlambert Vates 🪐 Co-Founder CEO
            last edited by

            @andSmv will take a look when he's around 🙂

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            • olivierlambertO Offline
              olivierlambert Vates 🪐 Co-Founder CEO
              last edited by

              What's your exact model of Coral TPU by the way?

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              • olivierlambertO Offline
                olivierlambert Vates 🪐 Co-Founder CEO
                last edited by

                For reference: https://github.com/google-coral/edgetpu/issues/343#issuecomment-1287251821

                dakota created this issue in google-coral/edgetpu

                open Apex failing with error -110 (No /dev/apex_0) #343

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                • L Offline
                  logical.systems @olivierlambert
                  last edited by

                  @olivierlambert M.2 Accelerator B+M Key
                  https://coral.ai/products/m2-accelerator-bm#description

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                  • olivierlambertO Offline
                    olivierlambert Vates 🪐 Co-Founder CEO
                    last edited by

                    So I've heard Qubes OS people did some patches to workaround the broken PCI spec for the device, I need to ask around more details about this.

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                    • olivierlambertO Offline
                      olivierlambert Vates 🪐 Co-Founder CEO
                      last edited by

                      @andSmv I discussed with Marek from Qubes, he told me that might be relevant (or not): https://lore.kernel.org/xen-devel/20221114192100.1539267-2-marmarek@invisiblethingslab.com/

                      What do you think?

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                      • andSmvA Offline
                        andSmv Vates 🪐 XCP-ng Team Xen Guru
                        last edited by andSmv

                        Hello, sorry for late response (just discovered the topic) 🙏

                        With regards of Marek patches, I'm actually think it can worth a try (at least the patch seems to treat the problem where MSI-x PBA page is shared with other regs of the device), but there's some cons too:

                        • the patches are quite new (doesn't seems to be integrated yet).
                        • the patches can be applied to more recent Xen (not XCP-ng Xen), and even we could probably backport them, it potentially will require some significant work
                        • we are not 100% sure it's the issue (or the only issue)

                        So If this is a must have, we can go and do some digging to make it work (but still in the scope of "exeperimental" platform, not the production platform)

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                        • olivierlambertO Offline
                          olivierlambert Vates 🪐 Co-Founder CEO
                          last edited by

                          We could probably try on a non-XCP-ng platform with a very recent "vanilla" Xen (+Marek patches) and see if it's fixed. If it is, then we could think about a potential backport when 8.3 will include a more recent Xen version 🙂

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                          • andSmvA Offline
                            andSmv Vates 🪐 XCP-ng Team Xen Guru
                            last edited by andSmv

                            @logical-systems I will check which Xen version the patches are easily applied and If you want I could give you a hand (if needed) to build and install your builded XEN, so you can test if this resolve your issue.

                            Unfortunatly we don't have the related HW (Coral TPU) to test it by ourselves.

                            UPDATE: the both patches apply to xen 4.17 (tag RELEASE-4.17.0)

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                            • NornodeN Offline
                              Nornode @andSmv
                              last edited by

                              @andSmv // @logical-systems

                              Hi,

                              I'm researching XCP-NG as an alternative to my homelab VMware hypervisor.
                              A goal for me is to get proper USB passthrough of the Google Coral TPU.

                              Did these patches make it work so passthrough to a VM is confirmed to be working?

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                              • R Offline
                                redakula @andSmv
                                last edited by

                                @andSmv said in Coral TPU PCI Passthrough:

                                @logical-systems I will check which Xen version the patches are easily applied and If you want I could give you a hand (if needed) to build and install your builded XEN, so you can test if this resolve your issue.

                                Unfortunatly we don't have the related HW (Coral TPU) to test it by ourselves.

                                UPDATE: the both patches apply to xen 4.17 (tag RELEASE-4.17.0)

                                So the above mentioned patches are included in the 4.17 that is currently available as a test version?

                                Or did you mean the patches worked on that version? 🙂

                                andSmvA 1 Reply Last reply Reply Quote 0
                                • olivierlambertO Offline
                                  olivierlambert Vates 🪐 Co-Founder CEO
                                  last edited by

                                  Now we have Xen 4.17 in XCP-ng 8.3, that might work (ping @andSmv )

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                                  • andSmvA Offline
                                    andSmv Vates 🪐 XCP-ng Team Xen Guru @redakula
                                    last edited by

                                    @redakula Hello, unfortunately these patches are not in 4.17 Xen (and was never integrated in more recent Xen). So, to test it, you have to manually apply patches (normally should apply as is to 4.17) and rebuild your Xen.

                                    R 2 Replies Last reply Reply Quote 1
                                    • R Offline
                                      redakula @andSmv
                                      last edited by

                                      @andSmv
                                      Damn - i was quick and have a coral m2 A+E coming in a few days 😆

                                      It's just for fun/learning so as long as it doesn't break my homelab too much i will be willing to test so we might get it included 👍
                                      Already using the 4.17 test version without a hitch since it came out.

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                                      • R Offline
                                        redakula @andSmv
                                        last edited by

                                        @andSmv
                                        As expected the VM with the coral m2 crashes on boot.

                                        Where would i start with building a custom Xen? The Koji docs seem directed at authorized package maintainers so would i need to build the sources directly from Xen?
                                        Feeling old admitting it was in the 2.6 days i last regularly built custom kernels 😊

                                        andSmvA 1 Reply Last reply Reply Quote 0
                                        • andSmvA Offline
                                          andSmv Vates 🪐 XCP-ng Team Xen Guru @redakula
                                          last edited by

                                          @redakula I'm on it. I keep you posted.

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                                          • andSmvA Offline
                                            andSmv Vates 🪐 XCP-ng Team Xen Guru @andSmv
                                            last edited by andSmv

                                            @andSmv
                                            Hello,
                                            I integrated Marek's patch and builded a rpm, so you can install (may be need to force rpm install or extract the xen.gz from rpm and install it manually if you prefer)

                                            Obviously there's no guarantee, it'll work in your case. Moreover, I didn't test the patch, so please backup all your data. It should be harmless, but....

                                            Here's the link you can download the rpm (should be operational until the end of the month) https://nextcloud.vates.fr/index.php/s/gd7kMwxHtNEP329

                                            Don't hesitate to ping me if you experience any issue to download/install/... the patched xen.

                                            Hope it helps!

                                            P.S. Be sure you're running 8.3 XCP-ng, as I only uploaded xen hypervisor rpm (and not libs/tools which come within)

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