KVM: Migrate lapic hrtimer when vcpu moves to another cpu

This reduces overhead by accessing cachelines from the wrong node, as well
as simplifying locking.

[Qing: fix for inactive or expired one-shot timer]

Signed-off-by: Yaozu (Eddie) Dong <Eddie.Dong@intel.com>
Signed-off-by: Qing He <qing.he@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index eeecadf5da4..f4618b9edf9 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -441,8 +441,10 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
         u64 phys_addr = __pa(vmx->vmcs);
         u64 tsc_this, delta;
 
-        if (vcpu->cpu != cpu)
+        if (vcpu->cpu != cpu) {
                 vcpu_clear(vmx);
+                kvm_migrate_apic_timer(vcpu);
+        }
 
         if (per_cpu(current_vmcs, cpu) != vmx->vmcs) {
                 u8 error;