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authorZhai, Edwin <edwin.zhai@intel.com>2009-10-09 18:03:20 +0800
committerAvi Kivity <avi@redhat.com>2009-12-03 09:32:17 +0200
commitd255f4f2bac81eb798fcf76938147f1f6c756ae2 (patch)
treee00a5320033207436813afa109ef9404997fe773 /virt
parentd36f19e9ecd22dc035ef4cc6361b564be650f8e7 (diff)
downloadvexpress-lsk-d255f4f2bac81eb798fcf76938147f1f6c756ae2.tar.gz
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')
-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 70c8cbea0a9..cac69c4415d 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1108,6 +1108,21 @@ void kvm_resched(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_resched);
+void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu)
+{
+ ktime_t expires;
+ DEFINE_WAIT(wait);
+
+ prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
+
+ /* Sleep for 100 us, and hope lock-holder got scheduled */
+ expires = ktime_add_ns(ktime_get(), 100000UL);
+ schedule_hrtimeout(&expires, HRTIMER_MODE_ABS);
+
+ finish_wait(&vcpu->wq, &wait);
+}
+EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
+
static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct kvm_vcpu *vcpu = vma->vm_file->private_data;