[Bug 1894869]

[Nick Bauer]

https://bugs.launchpad.net/qemu/+bug/1894869

Here's the discussion with the upstream devs. The problem ended up being
on Chelsio's part as either the .7 funciton fo these cards should not
have even been exposed to the OS in the first place, or SR-IOV is
necessary to actually correct the parameters of this function.
Unfortunately, it looks like SR-IOV is no longer possible to enable on
these cards. Thank you for your help.

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https://bugs.launchpad.net/bugs/1894869

Title:
  Chelsio T4 has old MSIX PBA offset bug

Status in QEMU:
  Invalid
Status in Debian:
  In Progress

Bug description:
  There exists a bug with Chelsio NICs T4 that causes the following
  error:

  kvm: -device vfio-
  pci,host=0000:83:00.7,id=hostpci1.7,bus=pci.0,addr=0x11.7: vfio
  0000:83:00.7: hardware reports invalid configuration, MSIX PBA outside
  of specified BAR

  I discovered this bug on a Proxmox system, and I was working with a
  downstream Proxmox developer to try to fix this issue. They provided
  me with the following change to make from line 1484 of hw/vfio/pci.c:

  static void vfio_msix_early_setup(VFIOPCIDevice *vdev, Error **errp)
            * is 0x1000, so we hard code that here.
            */
           if (vdev->vendor_id == PCI_VENDOR_ID_CHELSIO &&
  -            (vdev->device_id & 0xff00) == 0x5800) {
  +            ((vdev->device_id & 0xff00) == 0x5800 ||
  +             (vdev->device_id & 0xff00) == 0x1425)) {
               msix->pba_offset = 0x1000;
           } else if (vdev->msix_relo == OFF_AUTOPCIBAR_OFF) {
               error_setg(errp, "hardware reports invalid configuration, "

  However, I found that this did not fix the issue, so the bug appears
  to work differently than the one that was present on the T5 NICs which
  has already been patched. I have attached the output of my lspci
  -nnkvv

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