[Bug 241581] PCIe passthrough is broken in QEMU 4 due to PCI Device ID conflict

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241581

            Bug ID: 241581
           Summary: PCIe passthrough is broken in QEMU 4 due to PCI Device
                    ID conflict
           Product: Base System
           Version: 11.2-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: kevo at gatorgraphics.com

I run a couple of FreeBSD based VMs in Proxmox. Upgrading to Proxmox 6 which
includes QEMU 4 broke the PCIe passthrough I had setup in both VMs. 

On further investigation someone on the proxmox forums suggested that the
problem is a device ID conflict.

https://forum.proxmox.com/threads/vm-w-pcie-passthrough-not-working-after-upgrading-to-6-0.56021/post-274339

Apparently the QEMU vendor and device ids are being used for the
ptnetmap-memdev device.

https://svnweb.freebsd.org/base/release/12.0.0/sys/net/netmap_virt.h?view=markup#l44

https://devicehunt.com/view/type/pci/vendor/1B36/device/000C

Any chance this can be fixed. I am currently having to run my VMs with an older
version of the Q35 machine in QEMU to make them work and I don't see any way I
can upgrade to later revisions until this is fixed. I suspect there are quite a
few people affected by this.

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