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authorAndrea Arcangeli <andrea@qumranet.com>2008-07-25 16:26:39 +0200
committerAvi Kivity <avi@qumranet.com>2008-07-29 12:33:40 +0300
commita1708ce8a362c4999f1201237ae7b77c4d13af82 (patch)
treed9d98623e18616a3c7eac0f652a57bd888c5cc70
parent6e86841d05f371b5b9b86ce76c02aaee83352298 (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.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 5916191420c7..9870ce422920 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);