diff options
| author |   Andres Lagar-Cavilla <andreslc@google.com> | 2014-09-22 14:54:42 -0700 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2014-09-24 14:07:58 +0200 |
| commit | 57128468080a8b6ea452223036d3e417f748af55 (patch) | |
| tree | e89cfc349a9c39710cfab4e387119365a0d64958 /mm/mmu_notifier.c | |
| parent | kvm/x86/mmu: Pass gfn and level to rmapp callback. (diff) | |
| download | linux-dev-57128468080a8b6ea452223036d3e417f748af55.tar.xz linux-dev-57128468080a8b6ea452223036d3e417f748af55.zip | |
kvm: Fix page ageing bugs
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 <andreslc@google.com>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to '')
| -rw-r--r-- | mm/mmu_notifier.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c index 950813b1eb36..2c8da9825fe3 100644 --- a/mm/mmu_notifier.c +++ b/mm/mmu_notifier.c @@ -107,7 +107,8 @@ void __mmu_notifier_release(struct mm_struct *mm) * existed or not. */ int __mmu_notifier_clear_flush_young(struct mm_struct *mm, - unsigned long address) + unsigned long start, + unsigned long end) { struct mmu_notifier *mn; int young = 0, id; @@ -115,7 +116,7 @@ int __mmu_notifier_clear_flush_young(struct mm_struct *mm, id = srcu_read_lock(&srcu); hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist) { if (mn->ops->clear_flush_young) - young |= mn->ops->clear_flush_young(mn, mm, address); + young |= mn->ops->clear_flush_young(mn, mm, start, end); } srcu_read_unlock(&srcu, id); |