From: "Barry Silverman" <barry@disus.com>
To: Keir Fraser <Keir.Fraser@cl.cam.ac.uk>, xen-devel@lists.sourceforge.net
Cc: Ian Pratt <Ian.Pratt@cl.cam.ac.uk>
Subject: RE: Re: "Barry Silverman": Setting GDT entries for Thread Local Storage
Date: Tue, 10 Feb 2004 21:38:51 -0500 [thread overview]
Message-ID: <IGEMLBGAECDFPIKMIMLCAEHPCFAA.barry@disus.com> (raw)
In-Reply-To: <E1AqHEV-0005CD-00@wisbech.cl.cam.ac.uk>
Re: vsyscall mapping issues
It seems that QEMU has the same issue as Xen with vsyscall (their fast
emulator can't map kernel virtual addresses > 0xa8000000) so they created a
kernel patch to dynamically generate the "fixed" symbol FIXADDR_TOP from a
config parameter, and to have the Makefile generate the .lds file used to
build the vsyscall DSO images. It seems to me that a similar solution can be
used for Xen.
http://mail.gnu.org/archive/html/qemu-devel/2003-12/msg00020.html
>>This should all work straightforwardly, unless TLS tries to install
>>segments that are "full size" (i.e. 4GB). I know that one of the
>>recent glibc threading solutions tries to do this --- it won't work
>>with Xen because we clip segments so that they do not overlap with
>>Xen's reserved area in the top 64MB of the virtual address space.
-- Keir
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next prev parent reply other threads:[~2004-02-11 2:38 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <E1AqGel-0004YN-00@wisbech.cl.cam.ac.uk>
2004-02-09 19:38 ` "Barry Silverman": Setting GDT entries for Thread Local Storage Keir Fraser
2004-02-10 17:49 ` Zachary Amsden
2004-02-10 18:10 ` Keir Fraser
2004-02-10 18:19 ` Keir Fraser
2004-02-10 19:33 ` Zachary Amsden
2004-02-11 2:38 ` Barry Silverman [this message]
2004-02-11 8:10 ` Keir Fraser
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