From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Abhiroop Dabral <abhiroop.dabral@gmail.com>, xen-devel@lists.xen.org
Subject: Re: AMD NPT support for Xen memory events
Date: Wed, 16 Jul 2014 10:07:42 +0100 [thread overview]
Message-ID: <53C640DE.6020507@citrix.com> (raw)
In-Reply-To: <CAKuLJhBRuKTozO8TdvdsErDsN=4xDLETymnJ-ppxZp_KGmLGPA@mail.gmail.com>
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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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next prev parent reply other threads:[~2014-07-16 9:07 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-16 4:38 AMD NPT support for Xen memory events Abhiroop Dabral
2014-07-16 9:07 ` Andrew Cooper [this message]
-- strict thread matches above, loose matches on Subject: below --
2014-07-16 18:11 Aravindh Puthiyaparambil (aravindp)
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