[0/3] Two minor fixes on virtio-iommu

Message

Duan, Zhenzhong Jan. 22, 2024, 6:40 a.m. UTC

PATCH1 fixes a potential issue with vfio devices when reboot to a
different OS which set bus number differently from previous OS.
I didn't reproduce the issue in reality, but it's still possible
in theory.

PATCH2 is a prerequisite of of PATCH3.

PATCH3 make virtio-iommu support PCI device aliases. If there are
more than one device in same IOMMU group, either due to topology,
isolation feature, etc. virtio-iommu can only make one which has
alias BDF works. This impacts both emulated and vfio devices.
I have reproduced the failure with an example config to have two
vfio devices under same pcie to pci bridge.
This patch also make a proper place in virtio-iommu to store
iova_ranges from vfio device when vfio device shares same IOMMU
group with other devices, either emulated or vfio devices.

Zhenzhong Duan (3):
  virtio_iommu: Clear IOMMUPciBus pointer cache when system reset
  hw/pci: Add two parameters to get_address_space
  virtio-iommu: Support PCI device aliases

 include/hw/pci/pci.h     | 11 ++++++++---
 hw/alpha/typhoon.c       |  3 ++-
 hw/arm/smmu-common.c     |  3 ++-
 hw/i386/amd_iommu.c      |  6 ++++--
 hw/i386/intel_iommu.c    |  6 ++++--
 hw/pci-host/astro.c      |  3 ++-
 hw/pci-host/designware.c |  3 ++-
 hw/pci-host/dino.c       |  3 ++-
 hw/pci-host/pnv_phb3.c   |  3 ++-
 hw/pci-host/pnv_phb4.c   |  3 ++-
 hw/pci-host/ppce500.c    |  3 ++-
 hw/pci-host/raven.c      |  3 ++-
 hw/pci-host/sabre.c      |  3 ++-
 hw/pci/pci.c             |  3 ++-
 hw/ppc/ppc440_pcix.c     |  3 ++-
 hw/ppc/spapr_pci.c       |  3 ++-
 hw/remote/iommu.c        |  3 ++-
 hw/s390x/s390-pci-bus.c  |  3 ++-
 hw/virtio/virtio-iommu.c | 21 ++++++++++++---------
 19 files changed, 58 insertions(+), 31 deletions(-)