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| author | Paolo Bonzini <pbonzini@redhat.com> | 2015-07-29 11:32:20 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-07-30 16:02:54 +0200 |
| commit | dd489240a21afc3ff3962aba5d987229536cae63 (patch) | |
| tree | cc724510e7c36d47cf128b5e3d5dc757d938851d /virt | |
| parent | KVM: x86: remove unnecessary memory barriers for shared MSRs (diff) | |
| download | linux-dd489240a21afc3ff3962aba5d987229536cae63.tar.xz linux-dd489240a21afc3ff3962aba5d987229536cae63.zip | |
KVM: document memory barriers for kvm->vcpus/kvm->online_vcpus
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/kvm_main.c | 5 |
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); |