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[Xen-devel] Re: [RFC, PATCH 7/24] i386 Vmi memory hole

Gerd Hoffmann wrote:
       pushl $SYSENTER_RETURN

SYSENTER_RETURN is a link time constant that is defined based on the
location of the vsyscall page.  If the vsyscall page can move, this can
not be a constant.

The vsyscall page is at PAGE_OFFSET - 2*PAGE_SIZE.  It doesn't move.  At
least not at runtime.  At compile time it can change with the new
VMSPLIT config options, but that isn't a problem ;)

Okay, I get it now. Thanks for the explanation. This certainly does simplify the problem.


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