diff options
| author | Andrea Arcangeli <andrea@qumranet.com> | 2008-07-25 16:26:39 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-07-29 12:33:40 +0300 |
| commit | a1708ce8a362c4999f1201237ae7b77c4d13af82 (patch) | |
| tree | d9d98623e18616a3c7eac0f652a57bd888c5cc70 | |
| parent | 6e86841d05f371b5b9b86ce76c02aaee83352298 (diff) | |
KVM: Allow reading aliases with mmu_lock
This allows the mmu notifier code to run unalias_gfn with only the
mmu_lock held. Only alias writes need the mmu_lock held. Readers will
either take the slots_lock in read mode or the mmu_lock.
Signed-off-by: Andrea Arcangeli <andrea@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
| -rw-r--r-- | arch/x86/kvm/x86.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 5916191420c..9870ce42292 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1495,6 +1495,7 @@ static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm, goto out; down_write(&kvm->slots_lock); + spin_lock(&kvm->mmu_lock); p = &kvm->arch.aliases[alias->slot]; p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT; @@ -1506,6 +1507,7 @@ static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm, break; kvm->arch.naliases = n; + spin_unlock(&kvm->mmu_lock); kvm_mmu_zap_all(kvm); up_write(&kvm->slots_lock); |