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>
[-- Attachment #1.1: Type: text/plain, Size: 1232 bytes --]
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
[-- Attachment #1.2: Type: text/html, Size: 4735 bytes --]
[-- Attachment #2: Type: text/plain, Size: 126 bytes --]
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel
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)
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=53C640DE.6020507@citrix.com \
--to=andrew.cooper3@citrix.com \
--cc=abhiroop.dabral@gmail.com \
--cc=xen-devel@lists.xen.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.