Linux 32bit BAR atomic repositioning

Description:

Linux will attempt to reposition 32bit BARs without disabling memory decoding: https://elixir.bootlin.com/linux/v6.13.2/source/drivers/pci/setup-res.c#L92

This won't work with the current vPCI code on a PVH dom0, as the current vPCI logic in Xen requires that memory decoding is disabled to change the position of BARs.

Supporting such (according to the spec) valid use-case will require changes to vPCI to remap BARs while memory decoding is enabled.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information