[0/3] xen: fix usage of devices behind a VMD bridge

Message

Roger Pau Monné Jan. 10, 2025, 2:01 p.m. UTC

Hello,

The following series should fix the usage of devices behind a VMD bridge
when running Linux as a Xen PV hardware domain (dom0).  I've only been
able to test PV. I think PVH should also work but I don't have hardware
capable of testing it right now.

I don't expect the first two patches to be problematic, the last patch
is likely to be more controversial.  I've tested it internally and
didn't see any issues, but my testing of PV mode is mostly limited to
dom0.

Thanks, Roger.

Roger Pau Monne (3):
  xen/pci: do not register devices outside of PCI segment scope
  vmd: disable MSI remapping bypass under Xen
  pci/msi: remove pci_msi_ignore_mask

 arch/x86/pci/xen.c           |  8 ++------
 drivers/pci/controller/vmd.c |  9 +++++++++
 drivers/pci/msi/msi.c        | 36 ++++++++++++++++++++----------------
 drivers/xen/pci.c            | 19 +++++++++++++++++++
 include/linux/msi.h          |  3 ++-
 kernel/irq/msi.c             |  2 +-
 6 files changed, 53 insertions(+), 24 deletions(-)