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xen-ia64-devel
Re: [Xen-ia64-devel] [PATCH] tlb miss handler
Le Jeudi 26 Janvier 2006 13:59, Isaku Yamahata a écrit :
> This patch is not for commit. But for review, commnets.
>
> Current itlb/dtlb miss handlers don't handle a tlb miss
> in xen/ia64 identity mapping area.
> Such a miss might occur because xen/ia64 enables vhpt walker
> even for region 7. (Please see set_one_rr())
> I haven't encountered it yet, I'm guessing so from reading code.
>
> Vti itlb/dtlb miss handlers do it by checking psr.vm bits.
> This patch is not so optimized for review,
> but it should be done later.
Quiet interesting because I have just worked a little bit in this area.
My comments:
itlb miss must not occur, since Xen is mapped with a itm.
dtlb miss should not occur for the same reason, but they occur at least during
start-up while Xen reads bootparams and EFI. This is done before enabling
VHPT.
So i/d tlb miss in Xen should crash (and invoke debugger you have added).
BTW, I think the size of the identity mapped region should be shrinked in
order to enabled virtual memory in Xen. This will be necessary for virtual
mem map. That's the point I have looked.
Things are easy now, but could change due to NUMA or sparse memory!
Tristan.
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