[PATCH v4 0/9] vfio: selftests: Add driver for Intel Ethernet Gigabit Controller (IGB)

[Josh Hilke <jrhilke@google.com>]

This v4 of a series which adds a VFIO selftest driver for the Intel
Gigabit Ethernet controller (IGB), specifically targeting the 82576
device. IGB is fully virtualized in QEMU, making it suitable for running
VFIO selftests without specialized hardware.

v3: https://lore.kernel.org/kvm/20260708-igb_v3_b4-v3-0-1272650ca614@google.com/

Changes for this version address Sashiko's legitimate and false positive
comments. See changelog.

Testing
=======
- VFIO selftests builds clean at every commit
- vfio_pci_driver_test passes using IGB driver + QEMU. Use the following
  command to run the tests:

  vng \
  --run arch/x86/boot/bzImage \
  --user root \
  --disable-microvm \
  --memory 32G \
  --cpus 8 \
  --qemu-opts="-M q35,accel=kvm,kernel-irqchip=split" \
  --qemu-opts="-device intel-iommu,intremap=on,caching-mode=on,device-iotlb=on" \
  --qemu-opts="-netdev user,id=net0 -device igb,netdev=net0,addr=09.0" \
  --append "console=ttyS0 earlyprintk=ttyS0 intel_iommu=on iommu=pt" \
  --exec "modprobe vfio-pci && \
          ./tools/testing/selftests/vfio/scripts/setup.sh 0000:00:09.0 && \
          ./tools/testing/selftests/vfio/scripts/run.sh ./tools/testing/selftests/vfio/vfio_pci_driver_test"
--------
Changelog:

v3 -> v4
- Enable MSI-X mode in GPIE (Sashiko)
- Fix hardware initilization order to avoid race conditions (Alex/Sashiko)
- Add memory barrier to prevent speculative reads (Alex/Sashiko)
- Clean up stale references in commit messages and comments (Alex/Sashiko)
- Add a comment to address software/firmware semaphore (Alex/Sashiko)

v2 -> v3
- Poll reset bit and document the required wait time (David/Sashiko)
- Fix the logic for enabling PCI_COMMAND_MEMORY (David/Sashiko)
- Fail the test if autonegotation fails (David/Sashiko)
- Handle endianness conversions (David/Sashiko)
- Use real IGB headers at the start of the series (David)
- Add E1000_TXD_CMD_IFCS to the TX descriptor command word (Sashiko)

v1 -> v2
- Removed the chunking loop in igb_memcpy_start() (David)
- Removed redundant writes to status_error and hdr_addr (David)
- Include official IGB header files (David)

Signed-off-by: Josh Hilke <jrhilke@google.com>
---
Alex Williamson (8):
      vfio: selftests: igb: Use PHY internal loopback on 82576
      vfio: selftests: igb: Use advanced TX and RX descriptors
      vfio: selftests: igb: Program MSI-X interrupt routing
      vfio: selftests: igb: Extend memcpy completion timeout for line-rate hardware
      vfio: selftests: igb: Disable PCIe completion timeout retries
      vfio: selftests: Add helpers to re-enable interrupts
      vfio: selftests: igb: Factor hardware programming into igb_hw_init()
      vfio: selftests: igb: Recover after DMA-read faults

Josh Hilke (1):
      vfio: selftests: igb: Add driver for IGB QEMU device

 .../selftests/vfio/lib/drivers/igb/e1000_82575.h   |   1 +
 .../selftests/vfio/lib/drivers/igb/e1000_defines.h |   1 +
 .../selftests/vfio/lib/drivers/igb/e1000_regs.h    |   1 +
 tools/testing/selftests/vfio/lib/drivers/igb/igb.c | 554 +++++++++++++++++++++
 .../vfio/lib/include/libvfio/vfio_pci_device.h     |  14 +
 tools/testing/selftests/vfio/lib/libvfio.mk        |   1 +
 tools/testing/selftests/vfio/lib/vfio_pci_device.c |  22 +
 tools/testing/selftests/vfio/lib/vfio_pci_driver.c |   2 +
 8 files changed, 596 insertions(+)
---
base-commit: de61419bb27f985cb878b19942a55b026c9c865a
change-id: 20260707-igb_v3_b4-49194c14373c

Best regards,
-- 
Josh Hilke <jrhilke@google.com>