Bug#503821: Purpose of features/all/xen/workaround-pte-file.patch?
On Wed, Nov 05, 2008 at 07:06:58AM +0000, Ian Campbell wrote:
> This patch makes mprotect work by (very skankily) hacking out large page
> support which is unsupported on top of Xen anyway (I think so, currently
> anyway). I think I took out PAT as collaterol damage too. A cleaned up
> version without the pat damage might be an acceptable fix for the
> mprotect issue.
Xen have to support large pages, they are used over and over.
> My suspicion is that one of the -xen.c or mach-xen/asm/ files has gotten
> out of sync with a fix to its native partner since _PAGE_PSE is used for
> PROTNONE on native too so they must get round it somehow. I'll have a
> scrobble through and see if I can see it.
Would make sense.
What happens if you use "nopat" to disable the usage of PAT? The only
way to generate huge pages from userspace is to use hugetlbfs, which is
disabled.
Bastian
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