Thanks very much!
在2009年09月01日，"Tim Deegan" <Tim.Deegan@xxxxxxxxxx> 写道：
>At 04:29 +0100 on 01 Sep (1251779345), Wu Bingzheng wrote:
>> Hi,
>>
>> Dose Shadow Page Table use reserved-bit (PFEC_reserved_bit) in Xen 3.3.0?
>
>Yes. It uses reserved bits in ptes to indicate entries that are known
>to be either emulated-MMIO or not-present in the guest pagetables. Then
>in the fault handler it can use PFEC_reserved_bit to branch onto a fast
>path for those cases without taking any locks or walking the guest
>pagetables.
>
>> In my test many page fault set reserved-bit. But I can't understand its function, after reading SPT's page-fault handler.
>
>Have a look at the definition of SH_L1E_MAGIC in arch/x86/mm/shadow/types.h
>
>Cheers,
>
>Tim.
>
>
>--
>Tim Deegan <Tim.Deegan@xxxxxxxxxx>
>Principal Software Engineer, Citrix Systems (R&D) Ltd.
>[Company #02300071, SL9 0DZ, UK.]
>
>_______________________________________________
>Xen-devel mailing list
>Xen-devel@xxxxxxxxxxxxxxxxxxx
>http://lists.xensource.com/xen-devel
没有广告的终身免费邮箱,www.yeah.net
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel