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SubjectRe: [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.

Zach
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