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Commit d255f4f2 authored by Zhai, Edwin's avatar Zhai, Edwin Committed by Avi Kivity
Browse files

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: default avatar"Zhai, Edwin" <edwin.zhai@intel.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent d36f19e9

include/linux/kvm_host.h

+1 −0
Original line number Diff line number Diff line
@@ -286,6 +286,7 @@ int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn); 
void mark_page_dirty(struct kvm *kvm, gfn_t gfn);



void kvm_vcpu_block(struct kvm_vcpu *vcpu);

void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu);

void kvm_resched(struct kvm_vcpu *vcpu);

void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);

void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);

virt/kvm/kvm_main.c

+15 −0
Original line number Diff line number Diff line
@@ -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;