Apologies. Ignore this as it is just a re-post of a stale patch.
Paul
> -Original Message-
> From: Paul Durrant [mailto:paul.durr...@citrix.com]
> Sent: 29 October 2018 18:02
> To: xen-devel@lists.xenproject.org
> Cc: Paul Durrant ; Jan Beulich
> ; Andrew Cooper ; Wei Liu
>
> Subject:
The P2M common code currently restricts the MMIO mapping order of any
domain with IOMMU mappings, but that is not using shared tables, to 4k.
This has been shown to have a huge performance cost when passing through
a PCI device with a very large BAR (e.g. NVIDIA P40), increasing the guest
boot time
