diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2016-03-10 18:30:22 +0300 |
|---|---|---|
| committer | Radim Krčmář <rkrcmar@redhat.com> | 2016-04-20 16:29:17 +0300 |
| commit | 2e4682ba2ed79d8082b78d292b3b80f54d970b7a (patch) | |
| tree | 8e5b5b046d1e680516b2491275cfb1df9d14d2ab /arch/x86/kvm/irq_comm.c | |
| parent | 46971a2f59f135341f8912f516540fef6890d4df (diff) | |
| download | linux-2e4682ba2ed79d8082b78d292b3b80f54d970b7a.tar.xz | |
KVM: add missing memory barrier in kvm_{make,check}_request
kvm_make_request and kvm_check_request imply a producer-consumer
relationship; add implicit memory barriers to them. There was indeed
already a place that was adding an explicit smp_mb() to order between
kvm_check_request and the processing of the request. That memory
barrier can be removed (as an added benefit, kvm_check_request can use
smp_mb__after_atomic which is free on x86).
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/irq_comm.c')
| -rw-r--r-- | arch/x86/kvm/irq_comm.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/x86/kvm/irq_comm.c b/arch/x86/kvm/irq_comm.c index 54ead79e444b..dfb4c6476877 100644 --- a/arch/x86/kvm/irq_comm.c +++ b/arch/x86/kvm/irq_comm.c @@ -382,9 +382,6 @@ void kvm_scan_ioapic_routes(struct kvm_vcpu *vcpu, u32 i, nr_ioapic_pins; int idx; - /* kvm->irq_routing must be read after clearing - * KVM_SCAN_IOAPIC. */ - smp_mb(); idx = srcu_read_lock(&kvm->irq_srcu); table = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu); nr_ioapic_pins = min_t(u32, table->nr_rt_entries, |