RE: [Xen-ia64-devel] CPL of linux

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

>From:Magenheimer, Dan (HP Labs Fort Collins)
>Sent: 2006年3月10日 2:00
>
>I'm surprised to hear that both are used.  Perhaps CPL1
>for fully virtualized and CPL2 for paravirtualized?

For full virtualization like VT-I, guests still see 4 ring levels. Taking 
Linux as guest here, guest kernel still runs at CPL0, with application 
at CPL3.

>
>Whether PL=1 or PL=2 probably doesn't matter unless some
>guest kernel may accidentally get switched between them.
>But if that happened, I'd assume we'd see a kernel
>BUG pretty quickly.
>
>Dan

Agree. And another possibility is some bogus code in Xen where 
xenlinux is placed inconsistently some time. Just guess. :-)

Thanks,
Kevin
>
>> -----Original Message-----
>> From: xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx
>> [mailto:xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf
>> Of Tristan Gingold
>> Sent: Thursday, March 09, 2006 1:57 AM
>> To: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>> Subject: [Xen-ia64-devel] CPL of linux
>>
>> Hi,
>>
>> does Linux run in CPL 1 or in CPL 2 ?
>> It seems both are used!
>>
>> Tristan.
>>
>>
>> _______________________________________________
>> Xen-ia64-devel mailing list
>> Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>> http://lists.xensource.com/xen-ia64-devel
>>
>
>_______________________________________________
>Xen-ia64-devel mailing list
>Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>http://lists.xensource.com/xen-ia64-devel

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