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Commit cc92d6de authored by Thomas Huth's avatar Thomas Huth Committed by Cornelia Huck
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KVM: s390: Reworked SIGP RESTART order 



When SIGP RESTART detected an illegal CPU address, there is no need to
drop to userspace, we can return CC3 to the guest directly instead.
Also renamed __sigp_restart() to sigp_check_callable() (since this
is a better description of what the function is really doing) and
moved a string specific to RESTART to the calling place instead, so
that this function gets usable by other SIGP orders, too.

Signed-off-by: default avatarThomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
parent b13d3580

arch/s390/kvm/sigp.c

+11 −8
Original line number Diff line number Diff line
@@ -363,7 +363,8 @@ static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr, 
	return rc;

}



static int __sigp_restart(struct kvm_vcpu *vcpu, u16 cpu_addr)

/* Test whether the destination CPU is available and not busy */

static int sigp_check_callable(struct kvm_vcpu *vcpu, u16 cpu_addr)

{

	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;

	struct kvm_s390_local_interrupt *li;
@@ -382,9 +383,6 @@ static int __sigp_restart(struct kvm_vcpu *vcpu, u16 cpu_addr) 
	spin_lock_bh(&li->lock);

	if (li->action_bits & ACTION_STOP_ON_STOP)

		rc = SIGP_CC_BUSY;

	else

		VCPU_EVENT(vcpu, 4, "sigp restart %x to handle userspace",

			cpu_addr);

	spin_unlock_bh(&li->lock);

out:

	spin_unlock(&fi->lock);
@@ -459,10 +457,15 @@ int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu) 
		break;

	case SIGP_RESTART:

		vcpu->stat.instruction_sigp_restart++;

		rc = __sigp_restart(vcpu, cpu_addr);

		if (rc == SIGP_CC_BUSY)

			break;

		rc = sigp_check_callable(vcpu, cpu_addr);

		if (rc == SIGP_CC_ORDER_CODE_ACCEPTED) {

			VCPU_EVENT(vcpu, 4,

				   "sigp restart %x to handle userspace",

				   cpu_addr);

			/* user space must know about restart */

			rc = -EOPNOTSUPP;

		}

		break;

	default:

		return -EOPNOTSUPP;

	}