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

["Barry Silverman" <barry@xxxxxxxxx>]

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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