qemu-devel.nongnu.org archive mirror
 help / color / mirror / Atom feed
From: "Jim C. Brown" <jma5@umd.edu>
To: jhoger@pobox.com, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] QEMU_TMPDIR temp folder for KQEMU for Windows.
Date: Mon, 29 Aug 2005 17:59:12 -0400	[thread overview]
Message-ID: <20050829215912.GA2422@jbrown.mylinuxbox.org> (raw)
In-Reply-To: <1125341607.28382.28.camel@aragorn>

On Mon, Aug 29, 2005 at 11:53:26AM -0700, John R. Hogerhuis wrote:
> On Mon, 2005-08-29 at 11:05 -0700, Francois Rioux wrote:
> 
> KQEMU presumably does this on X86 by inlining more of the original code
> with minimal changes (i.e more tokens containing bigger swaths of native
> code, and less simple instruction emulation tokens), so performance will
> be more like what you could expect from a virtualizer. KQEMU is not open
> source though, so if you want to fiddle with that, you probably would
> have to do it on qvm86.
> 

Um, KQEMU/qvm86 don't do dynamic translation. They are virtualizers. They run
the code given to them (more or less) unchanged. They are simpler than VMware
because they only virtualize a subset of code (they dont support virtualizing
kernel code), so qemu still does translation for the code which cant be
virtualized (and in addition, switches become slightly more expensive due to
needing to convert register state between kernel and user code).

Without them, there is no native code run by qemu - everything is translated.

-- 
Infinite complexity begets infinite beauty.
Infinite precision begets infinite perfection.

  reply	other threads:[~2005-08-29 22:04 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-08-29 16:56 [Qemu-devel] Re: qemu 0.7.1 + dkms-qvm86-0.7.1 (mandriva 2005 / cooker) produces version mismatch Hannes Fuchs
2005-08-29 18:05 ` [Qemu-devel] QEMU_TMPDIR temp folder for KQEMU for Windows Francois Rioux
2005-08-29 18:53   ` John R. Hogerhuis
2005-08-29 21:59     ` Jim C. Brown [this message]
2005-08-30  7:29       ` [Qemu-devel] qemu optimization John R. Hogerhuis
2005-08-30 11:17         ` Paul Brook
2005-08-30 18:05           ` John R. Hogerhuis
2005-08-30 18:30             ` Paul Brook
2005-08-29 22:01   ` [Qemu-devel] QEMU_TMPDIR temp folder for KQEMU for Windows Jim C. Brown
2005-08-30  3:45     ` Francois Rioux
2005-08-30  9:08       ` Filip Navara
2005-08-30 13:42         ` Francois Rioux
2005-08-30 14:02           ` Paul Brook
2005-09-03 13:51           ` ace
2005-09-03 17:35             ` Doctor Bill
2005-09-03 14:48           ` Filip Navara

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=20050829215912.GA2422@jbrown.mylinuxbox.org \
    --to=jma5@umd.edu \
    --cc=jhoger@pobox.com \
    --cc=qemu-devel@nongnu.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 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).