[PATCH 0/5] Legacy direct-assign mode

[Jon Derrick <jonathan.derrick@intel.com>]

This set adds a legacy direct-assign mode. Newer enterprise hardware has
physical addressing hints to assist device passthrough to guests that needs to
correctly program bridge windows with physical addresses. Some customers are
using a legacy method that relies on the VMD subdevice domain's root port
windows to be written with the physical addresses. This method also allows
other hypervisors besides QEMU/KVM to perform guest passthrough.

This patchset adds a host and guest mode to write the physical address
information to the root port registers in the host and read them in the guest,
and restore them in both cases on module unload.

This patchset also folds in the VMD subdevice domain secondary bus reset
patchset [1] to clear the domain prior to guest passthrough.

[1] https://patchwork.kernel.org/project/linux-pci/cover/20200928010557.5324-1-jonathan.derrick@intel.com/

Jon Derrick (5):
  PCI: vmd: Reset the VMD subdevice domain on probe
  PCI: Add a reset quirk for VMD
  PCI: vmd: Add offset translation helper
  PCI: vmd: Pass features to vmd_get_phys_offsets()
  PCI: vmd: Add legacy guest passthrough mode

 drivers/pci/controller/vmd.c | 200 ++++++++++++++++++++++++++++++++++++++-----
 drivers/pci/quirks.c         |  48 +++++++++++
 2 files changed, 227 insertions(+), 21 deletions(-)

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1.8.3.1