Re: [Xen-devel] [PATCH for-4.11] x86/dom0: add extra RAM regions as RESERVED for PVH memory map

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Thu, May 03, 2018 at 05:46:27AM -0600, Jan Beulich wrote:
> >>> On 03.05.18 at 11:56, <roger.pau@xxxxxxxxxx> wrote:
> > When running as PVH Dom0 the native memory map is used in order to
> > craft a tailored memory map for Dom0 taking into account it's memory
> > limit.
> > 
> > Dom0 memory is always going to be smaller than the total amount
> > of memory present on the host, so in order to prevent Dom0 from
> > relocating PCI BARs over RAM regions mark all the RAM regions not
> > available to Dom0 as RESERVED in the memory map.
> 
> I'm basically fine with this change, but I think I'd prefer UNUSABLE over
> RESERVED.

OK, I've looked at the definitions from the ACPI spec and I think both
are suitable in order to accomplish the goal. So I'm fine with sending
a v2 with UNUSABLE instead of RESERVED.

> > I also think this should be included in the 4.11 release because it
> > only modifies PVH Dom0 builder code, and that's still experimental, so
> > there's no chance of breaking a supported feature.
> 
> This can equally be taken as a reason why there's no point in it being
> put in for 4.11. But that's not to say I'm opposed to doing so, it's just
> that I consider the argument questionable.

Well, it *might* make a Dom0 PVH work in cases it wouldn't, but since
it's experimental anyone playing with PVH Dom0 should probably be
using staging already.

Thanks, Roger.

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