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Commit c896939f authored by David Hildenbrand's avatar David Hildenbrand Committed by Christian Borntraeger
Browse files

KVM: use heuristic for fast VCPU lookup by id 



Usually, VCPU ids match the array index. So let's try a fast
lookup first before falling back to the slow iteration.

Suggested-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: default avatarDominik Dingel <dingel@linux.vnet.ibm.com>
Reviewed-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: default avatarDavid Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
parent e09fefde

include/linux/kvm_host.h

+5 −0
Original line number Diff line number Diff line
@@ -472,6 +472,11 @@ static inline struct kvm_vcpu *kvm_get_vcpu_by_id(struct kvm *kvm, int id) 
	struct kvm_vcpu *vcpu;

	int i;



	if (id < 0 || id >= KVM_MAX_VCPUS)

		return NULL;

	vcpu = kvm_get_vcpu(kvm, id);

	if (vcpu && vcpu->vcpu_id == id)

		return vcpu;

	kvm_for_each_vcpu(i, vcpu, kvm)

		if (vcpu->vcpu_id == id)

			return vcpu;