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From: Karl Magdsick <kmagnum@gmail.com>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] About qemu emulation speed (a question) and supported OS
Date: Thu, 15 Sep 2005 17:26:26 -0400	[thread overview]
Message-ID: <cd8ecdef050915142644768e9@mail.gmail.com> (raw)
In-Reply-To: <20050914133733.GA6052@jbrown.mylinuxbox.org>

> VMware handles kernel code. You are right that x86 code can't be 100% virtualized
> (even at the userland level) but VMware uses a lot of nasty disgusting tricks
> in order to work around them. (For example, playing with shadow pagetables
> so that a page of modified code is run but if the code tries to inspect itself
> it sees another (unexecuted) page that contains the original code.)

I take it self-modifying kernel code would have serious issues.

I seem to recall my attempts to run v2OS (which uses a self-modifying
assembly code boot sequence) inside VMWare crashing badly circa 2001.


-Karl

  parent reply	other threads:[~2005-09-15 21:29 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-09-13 12:36 [Qemu-devel] About qemu emulation speed (a question) and supported OS Alexandre Leclerc
2005-09-13 13:08 ` Adrian Smarzewski
2005-09-13 18:02   ` Alexandre Leclerc
2005-09-13 13:38 ` Jim C. Brown
2005-09-13 14:58   ` Anthony Liguori
2005-09-13 21:48     ` Jim C. Brown
2005-09-14  0:18       ` Mark Williamson
2005-09-14  2:48       ` Anthony Liguori
2005-09-14  3:48         ` Mark Williamson
2005-09-14  4:27           ` Anthony Liguori
2005-09-14  4:58             ` Mike Swanson
2005-09-14 13:39             ` Jim C. Brown
2005-09-14 18:46               ` Anthony Liguori
2005-09-14 22:42                 ` Jim C. Brown
2005-09-14 13:37         ` Jim C. Brown
2005-09-14 15:47           ` Henrik Nordstrom
2005-09-14 17:53             ` Mark Williamson
2005-09-14 17:18           ` John R. Hogerhuis
2005-09-14 22:34             ` Jim C. Brown
2005-09-14 17:46           ` Mark Williamson
2005-09-15 21:26           ` Karl Magdsick [this message]
2005-09-15 23:24             ` Mark Williamson

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