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Re: [Xen-devel] [v7][RFC][PATCH 06/13] hvmloader/ram: check if guest memory is out of reserved device memory maps



>>> On 20.11.14 at 15:40, <kevin.tian@xxxxxxxxx> wrote:
>>  From: Tian, Kevin
>> Sent: Thursday, November 20, 2014 4:51 PM
>> > From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
>> > Sent: Thursday, November 20, 2014 4:04 PM
>> > >>> On 20.11.14 at 08:45, <kevin.tian@xxxxxxxxx> wrote:
>> > > Current option sounds a reasonable one, i.e. passing a list of BDFs
>> > > assigned to this VM before populating p2m, and then having
>> > > hypervisor to filter out reserved regions associated with those
>> > > BDFs. This way libxc teaches Xen to create reserved regions once,
>> > > and then later the filtered info is returned upon query.
>> >
>> > Reasonable, but partly redundant. The positive aspect being that
>> > it permits this list and the list of actually being assigned devices to
>> > be different, i.e. allowing holes to be set up for devices that only
>> > _may_ get assigned at some point.
>> 
>> redundant if we think the list only exactly matching the statically
>> assigned devices. but that's just current point.
>> 
>> reasonable if we think there may be other policies impacting the list
>> (e.g. if hotplugable device may have a config option and then we have
>> a potential list larger than static assigned devices). From this angle
>> I think the new interface actually makes sense for this very purpose.
> 
> Jan are you OK with this?

I can live with it, yes.

Jan


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