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Re: [Xen-devel] AMD NPT support for Xen memory events
On 16/07/14 05:38, Abhiroop Dabral
wrote:
Hi,
I
was looking at the code for the memory events for guest domain
in "xen/arch/xen/mm/mem_event.c". In the function
"mem_event_domctl()" for the case
"XEN_DOMCTL_MEM_EVENT_OP_ACCESS", there
is a comment that "Currently only EPT is supported" and then a
check is made for the vmx presence and control returns if it
is not Intel VT with an error.
I
am trying to make the memory events working on AMD SVM with
NPT support.
My
question is that is there a specific reason why AMD NPT is
supported there?
The
things I should keep in mind/work on to support the memory
events on AMD NPT.
(Working
on Xen 4.4 on HVM guests (windows XP 32 bit -PAE)
I am not aware of any technical reasons why AMD support could not be
added.
I don't know why there is still a VMX check. c/s d928515d76 took
out an EPT check and that appears to have been fine.
Try it and see - it could be as easy as just deleting the vmx check.
It would certainly be nice to try and get some parity back in our
feature sets; a number of new features arrive as Intel-only because
they were developed on Intel systems, rather than a specific reason
why the feature wouldn't work on AMD.
~Andrew
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