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 /drivers/iommu | |
| parent | 8a9522d2fe6a1b643d3aef5ab7f097f73c601e7a (diff) | |
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 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/amd_iommu_v2.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c index 5f578e850fc..90d734bbf46 100644 --- a/drivers/iommu/amd_iommu_v2.c +++ b/drivers/iommu/amd_iommu_v2.c @@ -402,9 +402,11 @@ static void __mn_flush_page(struct mmu_notifier *mn, static int mn_clear_flush_young(struct mmu_notifier *mn, struct mm_struct *mm, - unsigned long address) + unsigned long start, + unsigned long end) { - __mn_flush_page(mn, address); + for (; start < end; start += PAGE_SIZE) + __mn_flush_page(mn, start); return 0; } |