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Commit b8983830 authored by David Hildenbrand's avatar David Hildenbrand Committed by Christian Borntraeger
Browse files

KVM: s390: sigp: separate preparation handlers 



This patch introduces in preparation for further code changes separate handler
functions for:
- SIGP (RE)START - will not be allowed to terminate pending orders
- SIGP (INITIAL) CPU RESET - will be allowed to terminate certain pending orders
- unknown sigp orders

All sigp orders that require user space intervention are logged.

Signed-off-by: default avatarDavid Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
parent 3d95c7d2

arch/s390/include/asm/sigp.h

+1 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
#define SIGP_RESTART		      6

#define SIGP_STOP_AND_STORE_STATUS    9

#define SIGP_INITIAL_CPU_RESET	     11

#define SIGP_CPU_RESET		     12

#define SIGP_SET_PREFIX		     13

#define SIGP_STORE_STATUS_AT_ADDRESS 14

#define SIGP_SET_ARCHITECTURE	     18

arch/s390/kvm/sigp.c

+32 −15
Original line number Diff line number Diff line
@@ -284,11 +284,12 @@ static int __sigp_sense_running(struct kvm_vcpu *vcpu, 
	return rc;

}



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

static int sigp_check_callable(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu)

static int __prepare_sigp_re_start(struct kvm_vcpu *vcpu,

				   struct kvm_vcpu *dst_vcpu, u8 order_code)

{

	struct kvm_s390_local_interrupt *li = &dst_vcpu->arch.local_int;

	int rc = SIGP_CC_ORDER_CODE_ACCEPTED;

	/* handle (RE)START in user space */

	int rc = -EOPNOTSUPP;



	spin_lock(&li->lock);

	if (li->action_bits & ACTION_STOP_ON_STOP)
@@ -298,6 +299,20 @@ static int sigp_check_callable(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu) 
	return rc;

}



static int __prepare_sigp_cpu_reset(struct kvm_vcpu *vcpu,

				    struct kvm_vcpu *dst_vcpu, u8 order_code)

{

	/* handle (INITIAL) CPU RESET in user space */

	return -EOPNOTSUPP;

}



static int __prepare_sigp_unknown(struct kvm_vcpu *vcpu,

				  struct kvm_vcpu *dst_vcpu)

{

	/* handle unknown orders in user space */

	return -EOPNOTSUPP;

}



static int handle_sigp_dst(struct kvm_vcpu *vcpu, u8 order_code,

			   u16 cpu_addr, u32 parameter, u64 *status_reg)

{
@@ -350,25 +365,27 @@ static int handle_sigp_dst(struct kvm_vcpu *vcpu, u8 order_code, 
		rc = __sigp_sense_running(vcpu, dst_vcpu, status_reg);

		break;

	case SIGP_START:

		rc = sigp_check_callable(vcpu, dst_vcpu);

		if (rc == SIGP_CC_ORDER_CODE_ACCEPTED)

			rc = -EOPNOTSUPP;    /* Handle START in user space */

		rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);

		break;

	case SIGP_RESTART:

		vcpu->stat.instruction_sigp_restart++;

		rc = sigp_check_callable(vcpu, dst_vcpu);

		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;

		}

		rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);

		break;

	case SIGP_INITIAL_CPU_RESET:

		rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);

		break;

	case SIGP_CPU_RESET:

		rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);

		break;

	default:

		rc = -EOPNOTSUPP;

		rc = __prepare_sigp_unknown(vcpu, dst_vcpu);

	}



	if (rc == -EOPNOTSUPP)

		VCPU_EVENT(vcpu, 4,

			   "sigp order %u -> cpu %x: handled in user space",

			   order_code, dst_vcpu->vcpu_id);



	return rc;

}