Re: [Xen-devel] [PATCH RFC 9/9] mm: mark pages that have their permissions controlled by a domain

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 03.07.14 at 13:27, <rcojocaru@xxxxxxxxxxxxxxx> wrote:
> On 07/03/2014 01:19 PM, Jan Beulich wrote:
>>>>> On 02.07.14 at 15:34, <rcojocaru@xxxxxxxxxxxxxxx> wrote:
>>> This goes together with the mem-event API changes and marks certain
>>> pages as being controlled from outside the HV (a user domain in our
>>> case). This prevents Xen from resetting the permissions in certain
>>> cases, enforcing the previously expressed intention of receiving a
>>> memory event everytime the owning domain triggers a fault.
>> 
>> These "certain cases" would clearly benefit from being named in a
>> more precise fashion - it's not been that long ago that for some of
>> the cases where the access permissions got reset as a side effect
>> we decided to remove that side effect, and it was discussed to also
>> be done for at least one more case. I.e. perhaps you would not
>> need extensive changes like the ones here if that was done?
> 
> Could you please point us to these discussions? It would definitely be
> very nice if the problem has been fixed in the meantime.

http://lists.xenproject.org/archives/html/xen-devel/2014-03/msg03441.html
http://xenbits.xen.org/gitweb/?p=xen.git;a=commitdiff;h=e5ae6eefdfbc1816b050d02998f69f0b78d5c814

Jan


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