Re: [Xen-devel] [PATCH][v2] Hybrid extension support in Xen

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 02/02/2010 13:52, "Sheng Yang" <sheng@xxxxxxxxxxxxxxx> wrote:

>> I didn't even find where these get used, except to reserve an area in e820,
>> and it wasn't clear why that reservation is necessary.
>> 
> It has been used in the last [6/6] patch of Linux kernel side, which would use
> the pages to map grant table. It works the same as the MMIO region in PVonHVM
> device. Reserve it in BIOS because we think it's more elegant than depends on
> QEmu to provide the reserved memory space.

Hmm. Can't this be done in phases? It seems unnecessary to be making changes
solely to remove qemu dependencies in the intial patchset, when the patchset
does not actually achieve that aim.

I think an HVM guest with no PCI space is a little way off, and perhaps we
can find a better way than hardcoding an address in two places.

 -- Keir



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