[deliverable/linux.git] / arch / s390 / kvm / sigp.c

/*
 * sigp.c - handlinge interprocessor communication
 *
 * Copyright IBM Corp. 2008,2009
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License (version 2 only)
 * as published by the Free Software Foundation.
 *
 *    Author(s): Carsten Otte <cotte@de.ibm.com>
 *               Christian Borntraeger <borntraeger@de.ibm.com>
 *               Christian Ehrhardt <ehrhardt@de.ibm.com>
 */

#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <linux/slab.h>
#include "gaccess.h"
#include "kvm-s390.h"

/* sigp order codes */
#define SIGP_SENSE             0x01
#define SIGP_EXTERNAL_CALL     0x02
#define SIGP_EMERGENCY         0x03
#define SIGP_START             0x04
#define SIGP_STOP              0x05
#define SIGP_RESTART           0x06
#define SIGP_STOP_STORE_STATUS 0x09
#define SIGP_INITIAL_CPU_RESET 0x0b
#define SIGP_CPU_RESET         0x0c
#define SIGP_SET_PREFIX        0x0d
#define SIGP_STORE_STATUS_ADDR 0x0e
#define SIGP_SET_ARCH          0x12

/* cpu status bits */
#define SIGP_STAT_EQUIPMENT_CHECK   0x80000000UL
#define SIGP_STAT_INCORRECT_STATE   0x00000200UL
#define SIGP_STAT_INVALID_PARAMETER 0x00000100UL
#define SIGP_STAT_EXT_CALL_PENDING  0x00000080UL
#define SIGP_STAT_STOPPED           0x00000040UL
#define SIGP_STAT_OPERATOR_INTERV   0x00000020UL
#define SIGP_STAT_CHECK_STOP        0x00000010UL
#define SIGP_STAT_INOPERATIVE       0x00000004UL
#define SIGP_STAT_INVALID_ORDER     0x00000002UL
#define SIGP_STAT_RECEIVER_CHECK    0x00000001UL


static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr,
			unsigned long *reg)
{
	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	int rc;

	if (cpu_addr >= KVM_MAX_VCPUS)
		return 3; /* not operational */

	spin_lock(&fi->lock);
	if (fi->local_int[cpu_addr] == NULL)
		rc = 3; /* not operational */
	else if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
		 & CPUSTAT_RUNNING) {
		*reg &= 0xffffffff00000000UL;
		rc = 1; /* status stored */
	} else {
		*reg &= 0xffffffff00000000UL;
		*reg |= SIGP_STAT_STOPPED;
		rc = 1; /* status stored */
	}
	spin_unlock(&fi->lock);

	VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc);
	return rc;
}

static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
{
	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	struct kvm_s390_local_interrupt *li;
	struct kvm_s390_interrupt_info *inti;
	int rc;

	if (cpu_addr >= KVM_MAX_VCPUS)
		return 3; /* not operational */

	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	if (!inti)
		return -ENOMEM;

	inti->type = KVM_S390_INT_EMERGENCY;

	spin_lock(&fi->lock);
	li = fi->local_int[cpu_addr];
	if (li == NULL) {
		rc = 3; /* not operational */
		kfree(inti);
		goto unlock;
	}
	spin_lock_bh(&li->lock);
	list_add_tail(&inti->list, &li->list);
	atomic_set(&li->active, 1);
	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	if (waitqueue_active(&li->wq))
		wake_up_interruptible(&li->wq);
	spin_unlock_bh(&li->lock);
	rc = 0; /* order accepted */
unlock:
	spin_unlock(&fi->lock);
	VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
	return rc;
}

static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action)
{
	struct kvm_s390_interrupt_info *inti;

	inti = kzalloc(sizeof(*inti), GFP_ATOMIC);
	if (!inti)
		return -ENOMEM;
	inti->type = KVM_S390_SIGP_STOP;

	spin_lock_bh(&li->lock);
	list_add_tail(&inti->list, &li->list);
	atomic_set(&li->active, 1);
	atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
	li->action_bits |= action;
	if (waitqueue_active(&li->wq))
		wake_up_interruptible(&li->wq);
	spin_unlock_bh(&li->lock);

	return 0; /* order accepted */
}

static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action)
{
	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	struct kvm_s390_local_interrupt *li;
	int rc;

	if (cpu_addr >= KVM_MAX_VCPUS)
		return 3; /* not operational */

	spin_lock(&fi->lock);
	li = fi->local_int[cpu_addr];
	if (li == NULL) {
		rc = 3; /* not operational */
		goto unlock;
	}

	rc = __inject_sigp_stop(li, action);

unlock:
	spin_unlock(&fi->lock);
	VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
	return rc;
}

int kvm_s390_inject_sigp_stop(struct kvm_vcpu *vcpu, int action)
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	return __inject_sigp_stop(li, action);
}

static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
{
	int rc;

	switch (parameter & 0xff) {
	case 0:
		rc = 3; /* not operational */
		break;
	case 1:
	case 2:
		rc = 0; /* order accepted */
		break;
	default:
		rc = -EOPNOTSUPP;
	}
	return rc;
}

static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
			     unsigned long *reg)
{
	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	struct kvm_s390_local_interrupt *li = NULL;
	struct kvm_s390_interrupt_info *inti;
	int rc;
	u8 tmp;

	/* make sure that the new value is valid memory */
	address = address & 0x7fffe000u;
	if ((copy_from_user(&tmp, (void __user *)
		(address + vcpu->arch.sie_block->gmsor) , 1)) ||
	   (copy_from_user(&tmp, (void __user *)(address +
			vcpu->arch.sie_block->gmsor + PAGE_SIZE), 1))) {
		*reg |= SIGP_STAT_INVALID_PARAMETER;
		return 1; /* invalid parameter */
	}

	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	if (!inti)
		return 2; /* busy */

	spin_lock(&fi->lock);
	if (cpu_addr < KVM_MAX_VCPUS)
		li = fi->local_int[cpu_addr];

	if (li == NULL) {
		rc = 1; /* incorrect state */
		*reg &= SIGP_STAT_INCORRECT_STATE;
		kfree(inti);
		goto out_fi;
	}

	spin_lock_bh(&li->lock);
	/* cpu must be in stopped state */
	if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
		rc = 1; /* incorrect state */
		*reg &= SIGP_STAT_INCORRECT_STATE;
		kfree(inti);
		goto out_li;
	}

	inti->type = KVM_S390_SIGP_SET_PREFIX;
	inti->prefix.address = address;

	list_add_tail(&inti->list, &li->list);
	atomic_set(&li->active, 1);
	if (waitqueue_active(&li->wq))
		wake_up_interruptible(&li->wq);
	rc = 0; /* order accepted */

	VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
out_li:
	spin_unlock_bh(&li->lock);
out_fi:
	spin_unlock(&fi->lock);
	return rc;
}

int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
{
	int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
	int base2 = vcpu->arch.sie_block->ipb >> 28;
	int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
	u32 parameter;
	u16 cpu_addr = vcpu->arch.guest_gprs[r3];
	u8 order_code;
	int rc;

	/* sigp in userspace can exit */
	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
		return kvm_s390_inject_program_int(vcpu,
						   PGM_PRIVILEGED_OPERATION);

	order_code = disp2;
	if (base2)
		order_code += vcpu->arch.guest_gprs[base2];

	if (r1 % 2)
		parameter = vcpu->arch.guest_gprs[r1];
	else
		parameter = vcpu->arch.guest_gprs[r1 + 1];

	switch (order_code) {
	case SIGP_SENSE:
		vcpu->stat.instruction_sigp_sense++;
		rc = __sigp_sense(vcpu, cpu_addr,
				  &vcpu->arch.guest_gprs[r1]);
		break;
	case SIGP_EMERGENCY:
		vcpu->stat.instruction_sigp_emergency++;
		rc = __sigp_emergency(vcpu, cpu_addr);
		break;
	case SIGP_STOP:
		vcpu->stat.instruction_sigp_stop++;
		rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP);
		break;
	case SIGP_STOP_STORE_STATUS:
		vcpu->stat.instruction_sigp_stop++;
		rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP);
		break;
	case SIGP_SET_ARCH:
		vcpu->stat.instruction_sigp_arch++;
		rc = __sigp_set_arch(vcpu, parameter);
		break;
	case SIGP_SET_PREFIX:
		vcpu->stat.instruction_sigp_prefix++;
		rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
				       &vcpu->arch.guest_gprs[r1]);
		break;
	case SIGP_RESTART:
		vcpu->stat.instruction_sigp_restart++;
		/* user space must know about restart */
	default:
		return -EOPNOTSUPP;
	}

	if (rc < 0)
		return rc;

	vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
	vcpu->arch.sie_block->gpsw.mask |= (rc & 3ul) << 44;
	return 0;
}
Commit	Line	Data
5288fbf0 CB	1	/*
	2	* sigp.c - handlinge interprocessor communication
	3	*
9ace903d	4	* Copyright IBM Corp. 2008,2009
5288fbf0 CB	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License (version 2 only)
	8	* as published by the Free Software Foundation.
	9	*
	10	* Author(s): Carsten Otte <cotte@de.ibm.com>
	11	* Christian Borntraeger <borntraeger@de.ibm.com>
9ace903d	12	* Christian Ehrhardt <ehrhardt@de.ibm.com>
5288fbf0 CB	13	*/
	14
	15	#include <linux/kvm.h>
	16	#include <linux/kvm_host.h>
5a0e3ad6	17	#include <linux/slab.h>
5288fbf0 CB	18	#include "gaccess.h"
	19	#include "kvm-s390.h"
	20
	21	/* sigp order codes */
	22	#define SIGP_SENSE 0x01
	23	#define SIGP_EXTERNAL_CALL 0x02
	24	#define SIGP_EMERGENCY 0x03
	25	#define SIGP_START 0x04
	26	#define SIGP_STOP 0x05
	27	#define SIGP_RESTART 0x06
	28	#define SIGP_STOP_STORE_STATUS 0x09
	29	#define SIGP_INITIAL_CPU_RESET 0x0b
	30	#define SIGP_CPU_RESET 0x0c
	31	#define SIGP_SET_PREFIX 0x0d
	32	#define SIGP_STORE_STATUS_ADDR 0x0e
	33	#define SIGP_SET_ARCH 0x12
	34
	35	/* cpu status bits */
	36	#define SIGP_STAT_EQUIPMENT_CHECK 0x80000000UL
	37	#define SIGP_STAT_INCORRECT_STATE 0x00000200UL
	38	#define SIGP_STAT_INVALID_PARAMETER 0x00000100UL
	39	#define SIGP_STAT_EXT_CALL_PENDING 0x00000080UL
	40	#define SIGP_STAT_STOPPED 0x00000040UL
	41	#define SIGP_STAT_OPERATOR_INTERV 0x00000020UL
	42	#define SIGP_STAT_CHECK_STOP 0x00000010UL
	43	#define SIGP_STAT_INOPERATIVE 0x00000004UL
	44	#define SIGP_STAT_INVALID_ORDER 0x00000002UL
	45	#define SIGP_STAT_RECEIVER_CHECK 0x00000001UL
	46
	47
0096369d MS	48	static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr,
0096369d MS	49	unsigned long *reg)
5288fbf0	50	{
180c12fb	51	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
5288fbf0 CB	52	int rc;
	53
	54	if (cpu_addr >= KVM_MAX_VCPUS)
	55	return 3; /* not operational */
	56
b037a4f3	57	spin_lock(&fi->lock);
5288fbf0 CB	58	if (fi->local_int[cpu_addr] == NULL)
	59	rc = 3; /* not operational */
	60	else if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
	61	& CPUSTAT_RUNNING) {
	62	*reg &= 0xffffffff00000000UL;
	63	rc = 1; /* status stored */
	64	} else {
	65	*reg &= 0xffffffff00000000UL;
	66	*reg \|= SIGP_STAT_STOPPED;
	67	rc = 1; /* status stored */
	68	}
b037a4f3	69	spin_unlock(&fi->lock);
5288fbf0 CB	70
	71	VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc);
	72	return rc;
	73	}
	74
	75	static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
	76	{
180c12fb CB	77	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	78	struct kvm_s390_local_interrupt *li;
	79	struct kvm_s390_interrupt_info *inti;
5288fbf0 CB	80	int rc;
	81
	82	if (cpu_addr >= KVM_MAX_VCPUS)
	83	return 3; /* not operational */
	84
	85	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	86	if (!inti)
	87	return -ENOMEM;
	88
	89	inti->type = KVM_S390_INT_EMERGENCY;
	90
b037a4f3	91	spin_lock(&fi->lock);
5288fbf0 CB	92	li = fi->local_int[cpu_addr];
	93	if (li == NULL) {
	94	rc = 3; /* not operational */
	95	kfree(inti);
	96	goto unlock;
	97	}
	98	spin_lock_bh(&li->lock);
	99	list_add_tail(&inti->list, &li->list);
	100	atomic_set(&li->active, 1);
	101	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	102	if (waitqueue_active(&li->wq))
	103	wake_up_interruptible(&li->wq);
	104	spin_unlock_bh(&li->lock);
	105	rc = 0; /* order accepted */
	106	unlock:
b037a4f3	107	spin_unlock(&fi->lock);
5288fbf0 CB	108	VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
	109	return rc;
	110	}
	111
9ace903d	112	static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action)
5288fbf0	113	{
180c12fb	114	struct kvm_s390_interrupt_info *inti;
5288fbf0	115
9940fa80	116	inti = kzalloc(sizeof(*inti), GFP_ATOMIC);
5288fbf0 CB	117	if (!inti)
5288fbf0 CB	118	return -ENOMEM;
5288fbf0 CB	119	inti->type = KVM_S390_SIGP_STOP;
5288fbf0 CB	120
5288fbf0 CB	121	spin_lock_bh(&li->lock);
	122	list_add_tail(&inti->list, &li->list);
	123	atomic_set(&li->active, 1);
	124	atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
9ace903d	125	li->action_bits \|= action;
5288fbf0 CB	126	if (waitqueue_active(&li->wq))
	127	wake_up_interruptible(&li->wq);
	128	spin_unlock_bh(&li->lock);
9ace903d CE	129
	130	return 0; /* order accepted */
	131	}
	132
	133	static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action)
	134	{
	135	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	136	struct kvm_s390_local_interrupt *li;
	137	int rc;
	138
	139	if (cpu_addr >= KVM_MAX_VCPUS)
	140	return 3; /* not operational */
	141
	142	spin_lock(&fi->lock);
	143	li = fi->local_int[cpu_addr];
	144	if (li == NULL) {
	145	rc = 3; /* not operational */
	146	goto unlock;
	147	}
	148
	149	rc = __inject_sigp_stop(li, action);
	150
5288fbf0	151	unlock:
b037a4f3	152	spin_unlock(&fi->lock);
5288fbf0 CB	153	VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
	154	return rc;
	155	}
	156
9ace903d CE	157	int kvm_s390_inject_sigp_stop(struct kvm_vcpu *vcpu, int action)
	158	{
	159	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	160	return __inject_sigp_stop(li, action);
	161	}
	162
5288fbf0 CB	163	static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
	164	{
	165	int rc;
	166
	167	switch (parameter & 0xff) {
	168	case 0:
5288fbf0 CB	169	rc = 3; /* not operational */
	170	break;
	171	case 1:
	172	case 2:
	173	rc = 0; /* order accepted */
	174	break;
	175	default:
b8e660b8	176	rc = -EOPNOTSUPP;
5288fbf0 CB	177	}
	178	return rc;
	179	}
	180
	181	static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
0096369d	182	unsigned long *reg)
5288fbf0	183	{
180c12fb	184	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
53cb780a	185	struct kvm_s390_local_interrupt *li = NULL;
180c12fb	186	struct kvm_s390_interrupt_info *inti;
5288fbf0 CB	187	int rc;
	188	u8 tmp;
	189
	190	/* make sure that the new value is valid memory */
	191	address = address & 0x7fffe000u;
f50146bd CO	192	if ((copy_from_user(&tmp, (void __user *)
	193	(address + vcpu->arch.sie_block->gmsor) , 1)) \|\|
	194	(copy_from_user(&tmp, (void __user *)(address +
628eb9b8	195	vcpu->arch.sie_block->gmsor + PAGE_SIZE), 1))) {
5288fbf0 CB	196	*reg \|= SIGP_STAT_INVALID_PARAMETER;
	197	return 1; /* invalid parameter */
	198	}
	199
	200	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	201	if (!inti)
	202	return 2; /* busy */
	203
b037a4f3	204	spin_lock(&fi->lock);
53cb780a RK	205	if (cpu_addr < KVM_MAX_VCPUS)
53cb780a RK	206	li = fi->local_int[cpu_addr];
5288fbf0	207
53cb780a	208	if (li == NULL) {
5288fbf0 CB	209	rc = 1; /* incorrect state */
	210	*reg &= SIGP_STAT_INCORRECT_STATE;
	211	kfree(inti);
	212	goto out_fi;
	213	}
	214
	215	spin_lock_bh(&li->lock);
	216	/* cpu must be in stopped state */
	217	if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
	218	rc = 1; /* incorrect state */
	219	*reg &= SIGP_STAT_INCORRECT_STATE;
	220	kfree(inti);
	221	goto out_li;
	222	}
	223
	224	inti->type = KVM_S390_SIGP_SET_PREFIX;
	225	inti->prefix.address = address;
	226
	227	list_add_tail(&inti->list, &li->list);
	228	atomic_set(&li->active, 1);
	229	if (waitqueue_active(&li->wq))
	230	wake_up_interruptible(&li->wq);
	231	rc = 0; /* order accepted */
	232
	233	VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
	234	out_li:
	235	spin_unlock_bh(&li->lock);
	236	out_fi:
b037a4f3	237	spin_unlock(&fi->lock);
5288fbf0 CB	238	return rc;
	239	}
	240
	241	int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
	242	{
	243	int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
	244	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
	245	int base2 = vcpu->arch.sie_block->ipb >> 28;
	246	int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
	247	u32 parameter;
	248	u16 cpu_addr = vcpu->arch.guest_gprs[r3];
	249	u8 order_code;
	250	int rc;
	251
3eb77d51 CB	252	/* sigp in userspace can exit */
	253	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
	254	return kvm_s390_inject_program_int(vcpu,
	255	PGM_PRIVILEGED_OPERATION);
	256
5288fbf0 CB	257	order_code = disp2;
	258	if (base2)
	259	order_code += vcpu->arch.guest_gprs[base2];
	260
	261	if (r1 % 2)
	262	parameter = vcpu->arch.guest_gprs[r1];
	263	else
	264	parameter = vcpu->arch.guest_gprs[r1 + 1];
	265
	266	switch (order_code) {
	267	case SIGP_SENSE:
	268	vcpu->stat.instruction_sigp_sense++;
	269	rc = __sigp_sense(vcpu, cpu_addr,
	270	&vcpu->arch.guest_gprs[r1]);
	271	break;
	272	case SIGP_EMERGENCY:
	273	vcpu->stat.instruction_sigp_emergency++;
	274	rc = __sigp_emergency(vcpu, cpu_addr);
	275	break;
	276	case SIGP_STOP:
	277	vcpu->stat.instruction_sigp_stop++;
9ace903d	278	rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP);
5288fbf0 CB	279	break;
	280	case SIGP_STOP_STORE_STATUS:
	281	vcpu->stat.instruction_sigp_stop++;
9ace903d	282	rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP);
5288fbf0 CB	283	break;
	284	case SIGP_SET_ARCH:
	285	vcpu->stat.instruction_sigp_arch++;
	286	rc = __sigp_set_arch(vcpu, parameter);
	287	break;
	288	case SIGP_SET_PREFIX:
	289	vcpu->stat.instruction_sigp_prefix++;
	290	rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
	291	&vcpu->arch.guest_gprs[r1]);
	292	break;
	293	case SIGP_RESTART:
	294	vcpu->stat.instruction_sigp_restart++;
	295	/* user space must know about restart */
	296	default:
b8e660b8	297	return -EOPNOTSUPP;
5288fbf0 CB	298	}
	299
	300	if (rc < 0)
	301	return rc;
	302
	303	vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
	304	vcpu->arch.sie_block->gpsw.mask \|= (rc & 3ul) << 44;
	305	return 0;
	306	}