RE: [Xen-ia64-devel] PATCH: cleanup of tlbflush

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

>From: Tristan Gingold [mailto:Tristan.Gingold@xxxxxxxx]
>Sent: 2006年5月10日 19:57
>
>Le Mercredi 10 Mai 2006 13:38, Tian, Kevin a écrit :
>> From: Tristan Gingold [mailto:Tristan.Gingold@xxxxxxxx]
>>
>> >Sent: 2006年5月10日 18:47
>> >
>> >> I see your concern about flush efficiency. However we still need set
>> >> necessary mask bits for correctness, right?
>> >
>> >Not yet, because pages are not transfered.
>>
>> It's not specific to page flipping. Simple page sharing also has same
>> problem.
>No really.  Page sharing is only from domU to dom0.  Thus, if we trust
>dom0 we
>don't need to flush all the tlb.

No, even for dom0, the mapped va may be accessed on several vcpus 
and thus you have to flush all related TLBs. On this point, there's no 
need to differentiate dom0 or domU. Simple thing is to flush based on 
domain_dirty_cpumask upon unmap request.

Thanks,
Kevin

_______________________________________________
Xen-ia64-devel mailing list
Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-ia64-devel