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

From: Bug Watch Updater
Subject: [Bug 1894869] Re: Chelsio T4 has old MSIX PBA offset bug
Date: Thu, 22 Oct 2020 22:24:12 -0000

** Changed in: debian
       Status: In Progress => Invalid

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  Chelsio T4 has old MSIX PBA offset bug

Status in QEMU:
Status in Debian:

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

  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

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