Re: [Xen-devel] Re: "Barry Silverman": Setting GDT entries for Thread Local Storage

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

> 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

The Xen port of Linux already chnages values like FIXADDR_TOP,
compared with native x86 Linux. The vsyscall stuff will therefore 'just
work'. 

 -- Keir


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