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Re: [Xen-users] 64bit dom0, 32bit domU, glibc?

To: Mark Williamson <mark.williamson@xxxxxxxxxxxx>
Subject: Re: [Xen-users] 64bit dom0, 32bit domU, glibc?
From: Nico Kadel-Garcia <nkadel@xxxxxxxxx>
Date: 2007年8月23日 04:54:33 +0100
Cc: xen-users@xxxxxxxxxxxxxxxxxxx, Joseph Smith <smithj@xxxxxxxxx>
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Mark Williamson wrote:
i'm using xen 3.1 and i have a 64bit dom0 and 32bit (PAE enabled) domUs
(32bit userland and kernels). Do I still need to replace glibc w/ one
compiled with -mno-tls-refs in the domUs? I don't get the warning about
glibc during the domU boots.
No, you don't need to do that.
The TLS refs problem happened because 32-bit Xen and glibc both want to do crazy things with the processor's segmentation hardware. 32-bit Xen needs the segmentation for its own protection. 64-bit Xen doesn't protect itself using segmentation, so it's not necessary to do anything to prevent a conflict with glibc.
That old problem also seemed to involve the libraries in /lib/tls. It was easy to just move them aside to /lib/tls.old, and current versions of RedHat kernels drop a little file called "kernelcap" in /etc/ld.so.conf.d/ that helps prevent the use of those libraries.
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