Thank you for explanation
I have read the code ,and want to comfirm some confusion,and then try to
write something new,if nessary
the shadow pagetable on demand ,means a whole pagetable copy when the
process is scheduled, or just a part of the process's pagetable is copied
thanks in advance
cheers
Tim Deegan 写道:
At 20:47 +0800 on 05 Dec (1196887651), tgh wrote:
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?
Yes, though as I said we only shadow pagetables on demand when they are used.
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?
Yes.
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?
Yes.
Why are you asking this, by the way? Are you trying to write code,
or debug a problem, or write documentation?
Tim.
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