Re: [Xen-devel] (v2) Design proposal for RMRR fix

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 14.01.15 at 09:13, <kevin.tian@xxxxxxxxx> wrote:
>>  From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@xxxxxxxxxx]
>> Sent: Wednesday, January 14, 2015 12:46 AM
>> 
>> Perhaps an easier way of this is to use the existing
>> mechanism we have - that is the XENMEM_memory_map (which
>> BTW e820_host uses). If all of this is done in the libxl (which
>> already does this based on the host E820, thought it can
>> be modified to query the hypervisor for other 'reserved
>> regions') and hvmloader is modified to use XENMEM_memory_map
>> and base its E820 on that (and also QEMU-xen), then we solve
>> this problem and also the http://bugs.xenproject.org/xen/bug/28? 
> 
> I'm not familiar with that option, but a quick search looks saying
> it's only for PV guest?
> 
> and please note XENMEM_memory_map only includes RAM entries
> (looks also only for pv), while following above intention what we
> really want is real e820_host w/ all entries filled.

But from the very beginning when these were proposed it was
said that they would need extending from being PV/PVH only to
also be usable for HVM. Such a change would be minimally
intrusive afaict as at least the latter already is allowed for PVH
too.

Jan


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