From: Young Koh <young.koh@gmail.com>
To: Jeff Dike <jdike@addtoit.com>
Cc: user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [uml-devel] copy_from_user in SKAS mode
Date: Wed, 18 May 2005 09:47:37 -0400 [thread overview]
Message-ID: <3524bf1f05051806474362d786@mail.gmail.com> (raw)
In-Reply-To: <20050518011827.GA13287@ccure.user-mode-linux.org>
> Since UML has no direct access to the process userspace (i.e. process
> virtual addresses are meaningless in the kernel), it has to translate
> them to physical addresses. So, each page containing a piece of the
> incoming buffer is translated into a physical page, and the data copied
> from there.
you mean "physical" to the UML kernel? Because the UML kernel cannot
know about the real physical pages in the host kernel, do you mean
the UML kernel finds out which its (virtual) address maps to the same
real physical page that the user process's address maps to? but the
UML kernel and the user process would have different mappings and
cannot know about each other (if so, its a protection violation
between processes) Could you explain a bit more? Thanks a lot!!!
-Young
>
> Jeff
>
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next prev parent reply other threads:[~2005-05-18 13:47 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-17 23:33 [uml-devel] copy_from_user in SKAS mode Young Koh
2005-05-18 1:18 ` Jeff Dike
2005-05-18 13:47 ` Young Koh [this message]
2005-05-18 15:08 ` Jeff Dike
2005-05-18 22:34 ` Young Koh
2005-05-19 13:41 ` Blaisorblade
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