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authorPaolo Bonzini <pbonzini@redhat.com>2015-07-29 12:32:20 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2015-07-30 17:02:54 +0300
commitdd489240a21afc3ff3962aba5d987229536cae63 (patch)
treecc724510e7c36d47cf128b5e3d5dc757d938851d /virt/kvm
parentc847fe8895fded71d0b9a0ba58d3828320fd1824 (diff)
downloadlinux-dd489240a21afc3ff3962aba5d987229536cae63.tar.xz
KVM: document memory barriers for kvm->vcpus/kvm->online_vcpus
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt/kvm')
-rw-r--r--virt/kvm/kvm_main.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 8dc4828f623f..d8db2f8fce9c 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2206,6 +2206,11 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
}
kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
+
+ /*
+ * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus
+ * before kvm->online_vcpu's incremented value.
+ */
smp_wmb();
atomic_inc(&kvm->online_vcpus);