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xen-devel
Re: [Xen-devel] Page tables in Xen
hi
in the PV mode, when VM is migrated, the shadow page table will be
created , that is ,the every active process pagetable in the guestOS
will have a copy in the VMM, while the original one is maintianed as
virtual-to-physical address mapping , is it right? then, when the
guestOS process is scheduled , the shadow page table will be set into
the CR3 and the CPU address mapping will be worked with the shadow
pagetable rather than the original one, is it right? while every update
to the process original pagetable in the guestOS will be trap into the
VMM , where the shadow pagetable is updated and coherented with the
original one, is it right?
Thanks in advance
Tim Deegan 写道:
At 20:12 +0800 on 05 Dec (1196885526), tgh wrote:
hi
in the PV mode,VM guestOS pagetable is virtual-to-machine address
mapping,is it right?
Yes.
,and when a VM is migrated, the shadow page table
mode will be enabled ,is it right?
Yes.
then, the PVguestOS pagetalbe will
become the virtual-to-psuedophysical address mapping, or not?
Not.
then ,at
that time ,the shadow pagetalbe is virtual-to-machine one ,is it right?
Yes.
I am still confused ,especially about the PVguestOS pagetalbe when
shadow pagetable enabled for migration? is it a virtual-to-machine
address mapping, or a virtual-to-psuedophysical address one ?
*All* shadow pagetables are virtual-to-machine translations. Anything
else wouldn't be much use.
Cheers,
Tim.
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