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authorZhai, Edwin <edwin.zhai@intel.com>2009-10-09 06:03:20 -0400
committerAvi Kivity <avi@redhat.com>2009-12-03 02:32:17 -0500
commitd255f4f2bac81eb798fcf76938147f1f6c756ae2 (patch)
treee00a5320033207436813afa109ef9404997fe773 /virt/kvm
parentd36f19e9ecd22dc035ef4cc6361b564be650f8e7 (diff)
KVM: introduce kvm_vcpu_on_spin
Introduce kvm_vcpu_on_spin, to be used by VMX/SVM to yield processing once the cpu detects pause-based looping. Signed-off-by: "Zhai, Edwin" <edwin.zhai@intel.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'virt/kvm')
-rw-r--r--virt/kvm/kvm_main.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 70c8cbea0a99..cac69c4415df 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1108,6 +1108,21 @@ void kvm_resched(struct kvm_vcpu *vcpu)
1108} 1108}
1109EXPORT_SYMBOL_GPL(kvm_resched); 1109EXPORT_SYMBOL_GPL(kvm_resched);
1110 1110
1111void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu)
1112{
1113 ktime_t expires;
1114 DEFINE_WAIT(wait);
1115
1116 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1117
1118 /* Sleep for 100 us, and hope lock-holder got scheduled */
1119 expires = ktime_add_ns(ktime_get(), 100000UL);
1120 schedule_hrtimeout(&expires, HRTIMER_MODE_ABS);
1121
1122 finish_wait(&vcpu->wq, &wait);
1123}
1124EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1125
1111static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 1126static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1112{ 1127{
1113 struct kvm_vcpu *vcpu = vma->vm_file->private_data; 1128 struct kvm_vcpu *vcpu = vma->vm_file->private_data;