Messages in this thread | | | Subject | Re: [PATCH v2] Call xen_cleanhighmap() with 4MB aligned for page tables mapping | From | Boris Ostrovsky <> | Date | Wed, 27 Sep 2017 10:48:01 -0400 |
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On 09/27/2017 10:33 AM, Juergen Gross wrote: > On 27/09/17 15:38, Boris Ostrovsky wrote: >> On 09/27/2017 05:43 AM, Juergen Gross wrote: >>> On 27/09/17 11:41, Zhenzhong Duan wrote: >>>> When bootup a PVM guest with large memory(Ex.240GB), XEN provided initial >>>> mapping overlaps with kernel module virtual space. When mapping in this space >>>> is cleared by xen_cleanhighmap(), in certain case there could be an 2MB mapping >>>> left. This is due to XEN initialize 4MB aligned mapping but xen_cleanhighmap() >>>> finish at 2MB boundary. >> Does this mapping need to be 4MB-aligned? > I guess you are questioning the alignment of addr to be 4MB? > In this case you are right: the end of the mapping is 4MB aligned, as > correctly stated in the comment added.
Yes, and my question is why does it need to be aligned on 4MB. Doesn't 2MB alignment suffice?
-boris
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