[Bug 1894869] [NEW] Chelsio T4 has old MSIX PBA offset bug

[Nick Bauer]

Public bug reported:

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 was working with a downstream Proxmox developer to try to fix this
issue, and 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

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: chelsio t4

** Attachment added: "Full lspci -nnkvv output"
   https://bugs.launchpad.net/bugs/1894869/+attachment/5408718/+files/lspci.txt

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

Title:
  Chelsio T4 has old MSIX PBA offset bug

Status in QEMU:
  New

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 was working with a downstream Proxmox developer to try to fix this
  issue, and 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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