[PATCH v4 0/9] hw/pci: SR-IOV related fixes and improvements

[Akihiko Odaki]

I submitted a RFC series[1] to add support for SR-IOV emulation to
virtio-net-pci. During the development of the series, I fixed some
trivial bugs and made improvements that I think are independently
useful. This series extracts those fixes and improvements from the RFC
series. Below is an explanation of the patches:

Patch 1 adds a function to check if ROM BAR is explicitly enabled. It
is used in the RFC series to report an error if the user requests to
enable ROM BAR for SR-IOV VF. Patch 2 and 3 use it for vfio to remove
hacky device option dictionary inspection.

Patch 4 adds SR-IOV NumVFs validation to fix potential buffer overflow.

Patch 5 changes to realize SR-IOV VFs when the PF is being realized to
validate VF configuration.

Patch 6 fixes memory leak that occurs if a SR-IOV VF fails to realize.

[1]: https://patchew.org/QEMU/20231210-sriov-v2-0-b959e8a6dfaf@daynix.com/

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
---
Changes in v4:
- Reverted the change to pci_rom_bar_explicitly_enabled().
  (Michael S. Tsirkin)
- Added patch "pcie_sriov: Do not reset NumVFs after unregistering VFs".
- Added patch "hw/nvme: Refer to dev->exp.sriov_pf.num_vfs".
- Link to v3: 
20240212-reuse-v3-0-8017b689ce7f@daynix.com">https://lore.kernel.org/r/20240212-reuse-v3-0-8017b689ce7f@daynix.com

Changes in v3:
- Extracted patch "hw/pci: Use -1 as a default value for rombar" from
  patch "hw/pci: Determine if rombar is explicitly enabled"
  (Philippe Mathieu-Daudé)
- Added an audit result of PCIDevice::rom_bar to the message of patch
  "hw/pci: Use -1 as a default value for rombar"
  (Philippe Mathieu-Daudé)
- Link to v2: 
20240210-reuse-v2-0-24ba2a502692@daynix.com">https://lore.kernel.org/r/20240210-reuse-v2-0-24ba2a502692@daynix.com

Changes in v2:
- Reset after enabling a function so that NVMe VF state gets updated.
- Link to v1: 
20240203-reuse-v1-0-5be8c5ce6338@daynix.com">https://lore.kernel.org/r/20240203-reuse-v1-0-5be8c5ce6338@daynix.com

---
Akihiko Odaki (9):
      hw/pci: Use -1 as a default value for rombar
      hw/pci: Determine if rombar is explicitly enabled
      vfio: Avoid inspecting option QDict for rombar
      hw/qdev: Remove opts member
      pcie_sriov: Validate NumVFs
      pcie_sriov: Reuse SR-IOV VF device instances
      pcie_sriov: Release VFs failed to realize
      pcie_sriov: Do not reset NumVFs after unregistering VFs
      hw/nvme: Refer to dev->exp.sriov_pf.num_vfs

 docs/pcie_sriov.txt         |   8 ++--
 include/hw/pci/pci.h        |   2 +-
 include/hw/pci/pci_device.h |   7 ++-
 include/hw/pci/pcie_sriov.h |   6 +--
 include/hw/qdev-core.h      |   4 --
 hw/core/qdev.c              |   1 -
 hw/net/igb.c                |  13 ++++--
 hw/nvme/ctrl.c              |  29 +++++++-----
 hw/pci/pci.c                |  20 +++++----
 hw/pci/pci_host.c           |   4 +-
 hw/pci/pcie.c               |   4 +-
 hw/pci/pcie_sriov.c         | 106 +++++++++++++++++++++-----------------------
 hw/vfio/pci.c               |   3 +-
 system/qdev-monitor.c       |  12 ++---
 14 files changed, 118 insertions(+), 101 deletions(-)
---
base-commit: 5005aed8a7e728d028efb40e243ecfc2b4f3df3a
change-id: 20240129-reuse-faae22b11934

Best regards,
-- 
Akihiko Odaki <akihiko.odaki@daynix.com>