Re: [Xen-devel] [v10][PATCH 06/16] hvmloader/pci: Try to avoid placing BARs in RMRRs

[George Dunlap <dunlapg@xxxxxxxxx>]

On Mon, Jul 20, 2015 at 7:16 AM, Tiejun Chen <tiejun.chen@xxxxxxxxx> wrote:
> Try to avoid placing PCI BARs over RMRRs:
>
> - If mmio_hole_size is not specified, and the existing MMIO range has
>   RMRRs in it, and there is space to expand the hole in lowmem without
>   moving more memory, then make the MMIO hole as large as possible.
>
> - When placing RMRRs, find the next RMRR higher than the current base
>   in the lowmem mmio hole.  If it overlaps, skip ahead of it and find
>   the next one.
>
> This certainly won't work in all cases, but it should work in a
> significant number of cases.  Additionally, users should be able to
> work around problems by setting mmio_hole_size larger in the guest
> config.
>
> Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
> Signed-off-by: Tiejun Chen <tiejun.chen@xxxxxxxxx>
> ---
> v10:
>
> * This is from George' draft patch which implements an acceptable solution in
>   current cycle. Here I just implemented check_overlap_all() and some 
> cleanups.

Changes:

Reviewed-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel