On 03/07/2012 04:03 PM, Avi Kivity wrote:
On 03/07/2012 04:57 PM, Alexander Graf wrote:
On 03/07/2012 03:04 PM, Avi Kivity wrote:
On 03/07/2012 03:27 PM, Alexander Graf wrote:
At the time I made this patch, it seemed that only kvm-x86 supported
huge pages, on ppc the array should be empty:
Hrm. I suppose this refers to transparent huge pages?
Just huge pages. Whether they are static or dynamic is immaterial in
this context.
Well, book3s_hv and e500 support hugetlbfs. I've never had to touch
that patches code though - so I guess I'm still not really
understanding what it's there for O_o.
The kvm hugepage code uses large sptes to map large pages, when
available (either via hugetlbfs or transparent hugepages). Since x86
supports swapping, and needs to write-protect pages for dirty logging
and for shadowing guest pagetables, it needs a reverse map from pages to
sptes. The data structure we're discussing is part of the reverse map
for large pages.
Ah, now that makes more sense. On booke, we don't do rmap yet. On
book3s_hv, IIRC Paul did implement something, so I'd like to hear his
opinion on it really.
Alex
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