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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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5
virt/kvm/kvm_main.c
View file

@ -369,7 +369,8 @@ static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
struct mm_struct *mm,
unsigned long address)
unsigned long start,
unsigned long end)
{
struct kvm *kvm = mmu_notifier_to_kvm(mn);
int young, idx;
@ -377,7 +378,7 @@ static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
idx = srcu_read_lock(&kvm->srcu);
spin_lock(&kvm->mmu_lock);
young = kvm_age_hva(kvm, address);
young = kvm_age_hva(kvm, start, end);
if (young)
kvm_flush_remote_tlbs(kvm);