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kvm: Fix page ageing bugs

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1. We were calling clear_flush_young_notify in unmap_one, but we are
within an mmu notifier invalidate range scope. The spte exists no more
(due to range_start) and the accessed bit info has already been
propagated (due to kvm_pfn_set_accessed). Simply call
clear_flush_young.

2. We clear_flush_young on a primary MMU PMD, but this may be mapped
as a collection of PTEs by the secondary MMU (e.g. during log-dirty).
This required expanding the interface of the clear_flush_young mmu
notifier, so a lot of code has been trivially touched.

3. In the absence of shadow_accessed_mask (e.g. EPT A bit), we emulate
the access bit by blowing the spte. This requires proper synchronizing
with MMU notifier consumers, like every other removal of spte's does.

Signed-off-by: Andres Lagar-Cavilla <[email protected]>
Acked-by: Rik van Riel <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
This commit is contained in:
Andres Lagar-Cavilla 2014-09-22 14:54:42 -07:00 • committed by Paolo Bonzini
commit 5712846808
16 changed files with 71 additions and 41 deletions
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6
mm/rmap.c
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@ -1355,7 +1355,11 @@ static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount,
continue; /* don't unmap */
}
if (ptep_clear_flush_young_notify(vma, address, pte))
/*
* No need for _notify because we're within an
* mmu_notifier_invalidate_range_ {start|end} scope.
*/
if (ptep_clear_flush_young(vma, address, pte))
continue;
/* Nuke the page table entry. */