[Qemu-ppc] PCI resource alignment differs for hotplugged devices

[Shawn Anastasio]

Hello all,

When hotplugging QEMU ivshmem-doorbell devices on a ppc64 pseries guest,
it seems that the assigned resource for BAR 0 is on a
4K page boundary, but not 64k:

[   25.606930] pci 0001:00:00.0: BAR 2: assigned [mem 
0x220000000000-0x2200000fffff 64bit pref]
[   25.615257] pci 0001:00:00.0: BAR 1: assigned [mem 
0x200100000000-0x200100000fff]
[   25.617284] pci 0001:00:00.0: BAR 0: assigned [mem 
0x200100001000-0x2001000010ff]

This means that the device is not usable with the VFIO framework
on kernels with a 64k page size. After rebooting, BAR 0's address
is 64k-aligned and can be accessed like usual.

Is there any way to indicate to the system that BAR 0 should
be 64k aligned?

Thanks in advance,
Shawn