path: root/virt
diff options
authorPaul Mackerras <>2011-12-12 12:37:21 +0000
committerAvi Kivity <>2012-03-05 14:52:38 +0200
commita355aa54f1d25dff83c0feef8863d83a76988fdb (patch)
tree4fe27e8dd1a3935757b319726a8b8bdc10496930 /virt
parent342d3db763f2621ed4546ebf8f6c61cb29d7fbdb (diff)
KVM: Add barriers to allow mmu_notifier_retry to be used locklessly
This adds an smp_wmb in kvm_mmu_notifier_invalidate_range_end() and an smp_rmb in mmu_notifier_retry() so that mmu_notifier_retry() will give the correct answer when called without kvm->mmu_lock being held. PowerPC Book3S HV KVM wants to use a bitlock per guest page rather than a single global spinlock in order to improve the scalability of updates to the guest MMU hashed page table, and so needs this. Signed-off-by: Paul Mackerras <> Acked-by: Avi Kivity <> Signed-off-by: Alexander Graf <> Signed-off-by: Avi Kivity <>
Diffstat (limited to 'virt')
1 files changed, 3 insertions, 3 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 64be836f3348..9f32bffd37c0 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -357,11 +357,11 @@ static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
* been freed.
+ smp_wmb();
* The above sequence increase must be visible before the
- * below count decrease but both values are read by the kvm
- * page fault under mmu_lock spinlock so we don't need to add
- * a smb_wmb() here in between the two.
+ * below count decrease, which is ensured by the smp_wmb above
+ * in conjunction with the smp_rmb in mmu_notifier_retry().