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Re: [Xen-devel] Page Table Entry Modifications
On 22/09/15 20:35, Gohar Irfan wrote:
Hi All,
I want to know if, in the case of HVM (shadow page tables),
we can change the machine frame number pointed to by a page
table entry?
Yes - Xen is able to change the mfn in a pte.
An overly simplified example would be: let's say I have
page number 10 that is pointing to machine frame number 10,
but I would like it to point to machine frame number 1?
Yes - that is in theory possible.
Can this be achieved inside the "sh_page_fault" function
inside "xen/arch/x86/mm/shadow/multi.c" as this seems like a
relevant place for this modification to me.
What are you trying to achieve? Modifications such as what you
request are possible, but you are exceedingly likely to end up with
memory corruption as a result.
~Andrew
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