From: AnhNN <ngocanh198@gmail.com>
To: xen-devel@lists.xensource.com
Subject: Question about MMU update on HVM guest
Date: Fri, 13 May 2016 06:11:55 +0700 [thread overview]
Message-ID: <CAP6KD3hpHjvccRCAUR8cT0T0Bj27VR2P-iO_oPJvqLMDfCDK3Q@mail.gmail.com> (raw)
[-- Attachment #1.1: Type: text/plain, Size: 1127 bytes --]
Hi,
I have some questions about MMU update operation.
I add some logging in function *do_mmu_update* (in file
/xen/arch/x86/mm.c), and start Windows 7 32 bit HVM guest.
After guest started, I look at log and see that MMU update has been called
with every page of guest, with *pt_ower = 0* and *pg_owner = 1*. And with
every page, MMU update called 2 times. The first time, * page->count_info =
0x8000000000000002* after MMU update, but after that it decrease to
*0x8000000000000001* in a different function. At the second time,
*page->count_info
= 0x8000000000000002* after MMU update, and keep that value forever.
So the question is, why domain 0 have a reference to every pages of HVM
guest ?
And why in the second time of MMU update, count_info doesn't decrease to
*0x8000000000000001* ?
Thanks & Best Regards.
--
Nguyễn Ngọc Anh
Student - Course 53
Department of Computer Engineering - School of Information and
Communication Technology
Hanoi University Of Science And Technology.
Mobile: 0973402195
Email: ngocanh198@gmail.com <hiepnp1990@gmail.com>
Y!M: pancuro
Skype: ngocanh19890
[-- Attachment #1.2: Type: text/html, Size: 1505 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 reply other threads:[~2016-05-12 23:11 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-12 23:11 AnhNN [this message]
2016-05-18 11:39 ` Question about MMU update on HVM guest George Dunlap
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=CAP6KD3hpHjvccRCAUR8cT0T0Bj27VR2P-iO_oPJvqLMDfCDK3Q@mail.gmail.com \
--to=ngocanh198@gmail.com \
--cc=xen-devel@lists.xensource.com \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).