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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 <andreslc@google.com>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Andres Lagar-Cavilla
2014-09-22 14:54:42 -07:00
committed by Paolo Bonzini
parent 8a9522d2fe
commit 5712846808
16 changed files with 71 additions and 41 deletions
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3
arch/powerpc/kvm/book3s.h
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@@ -17,7 +17,8 @@ extern void kvmppc_core_flush_memslot_hv(struct kvm *kvm,
extern int kvm_unmap_hva_hv(struct kvm *kvm, unsigned long hva);
extern int kvm_unmap_hva_range_hv(struct kvm *kvm, unsigned long start,
unsigned long end);
extern int kvm_age_hva_hv(struct kvm *kvm, unsigned long hva);
extern int kvm_age_hva_hv(struct kvm *kvm, unsigned long start,
unsigned long end);
extern int kvm_test_age_hva_hv(struct kvm *kvm, unsigned long hva);
extern void kvm_set_spte_hva_hv(struct kvm *kvm, unsigned long hva, pte_t pte);