diff options
| author | Jérôme Glisse <jglisse@redhat.com> | 2017-10-23 14:15:13 -0400 |
|---|---|---|
| committer | Jérôme Glisse <jglisse@redhat.com> | 2018-03-23 13:05:36 -0400 |
| commit | d8047c8d88310489697c43a0c6ed24c247145464 (patch) | |
| tree | 07d640891caaf6291b266a7c49b13142664f9182 | |
| parent | 68f7a444b3a14f053553d27ff0439fdf9501bfa1 (diff) | |
kvm: leverage mmu_notifier context information to avoid useless spt invalidation
Use context informations on why a range is being invalidated to determine
if we need to invalidate the secondary page table (spt) or not.
Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
| -rw-r--r-- | virt/kvm/kvm_main.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 138ec2ea4aba..df54fc55963f 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -348,6 +348,13 @@ static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, struct kvm *kvm = mmu_notifier_to_kvm(mn); int need_tlb_flush = 0, idx; + switch (range->event) { + case NOTIFY_CHANGE_NOTIFY: + return; + default: + break; + } + idx = srcu_read_lock(&kvm->srcu); spin_lock(&kvm->mmu_lock); /* @@ -374,6 +381,13 @@ static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, { struct kvm *kvm = mmu_notifier_to_kvm(mn); + switch (range->event) { + case NOTIFY_CHANGE_NOTIFY: + return; + default: + break; + } + spin_lock(&kvm->mmu_lock); /* * This sequence increase will notify the kvm page fault that |