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Commit 2c1bb2be authored by David Hildenbrand's avatar David Hildenbrand Committed by Christian Borntraeger
Browse files

KVM: s390: fast path for sca_ext_call_pending 



If CPUSTAT_ECALL_PEND isn't set, we can't have an external call pending,
so we can directly avoid taking the lock.

Acked-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 fe0edcb7

arch/s390/kvm/interrupt.c

+4 −2
Original line number Diff line number Diff line
@@ -39,6 +39,9 @@ static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id) 
{

	int c, scn;



	if (!(atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND))

		return 0;



	read_lock(&vcpu->kvm->arch.sca_lock);

	if (vcpu->kvm->arch.use_esca) {

		struct esca_block *sca = vcpu->kvm->arch.sca;
@@ -60,8 +63,7 @@ static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id) 
	if (src_id)

		*src_id = scn;



	return c && atomic_read(&vcpu->arch.sie_block->cpuflags) &

			CPUSTAT_ECALL_PEND;

	return c;

}



static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id)