On Mon, 2021-03-22 at 12:28 +0000, Lorenzo Pieralisi wrote: > On Fri, Nov 20, 2020 at 03:51:39PM -0700, Jon Derrick wrote: > > 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@xxxxxxxxx/ > > > > 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(-) > > Hi Jon, > > it is unclear to me where we are with this series, please let me know. > > Thanks, > Lorenzo Hi Lorenzo, We can drop this series for now. We may revive it in the future with modifications to the reset sequence. Best, Jon
