[mirror_ubuntu-bionic-kernel.git] / arch / s390 / kvm / sigp.c

/*
 * handling 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 <asm/sigp.h>
#include "gaccess.h"
#include "kvm-s390.h"

static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr,
			u64 *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_STOPPED)) {
		*reg &= 0xffffffff00000000UL;
		rc = 1; /* status stored */
	} else {
		*reg &= 0xffffffff00000000UL;
		*reg |= SIGP_STATUS_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;
	inti->emerg.code = vcpu->vcpu_id;

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

static int __sigp_external_call(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_EXTERNAL_CALL;
	inti->extcall.code = vcpu->vcpu_id;

	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 */
	VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x", cpu_addr);
unlock:
	spin_unlock(&fi->lock);
	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);
	if ((atomic_read(li->cpuflags) & CPUSTAT_STOPPED))
		goto out;
	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);
out:
	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,
			     u64 *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_guest_absolute(vcpu, &tmp, address, 1) ||
	   copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)) {
		*reg |= SIGP_STATUS_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_STATUS_INCORRECT_STATE;
		kfree(inti);
		goto out_fi;
	}

	spin_lock_bh(&li->lock);
	/* cpu must be in stopped state */
	if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
		rc = 1; /* incorrect state */
		*reg &= SIGP_STATUS_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;
}

static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr,
				u64 *reg)
{
	int rc;
	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;

	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) {
			/* running */
			rc = 1;
		} else {
			/* not running */
			*reg &= 0xffffffff00000000UL;
			*reg |= SIGP_STATUS_NOT_RUNNING;
			rc = 0;
		}
	}
	spin_unlock(&fi->lock);

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

	return rc;
}

static int __sigp_restart(struct kvm_vcpu *vcpu, u16 cpu_addr)
{
	int rc = 0;
	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	struct kvm_s390_local_interrupt *li;

	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 out;
	}

	spin_lock_bh(&li->lock);
	if (li->action_bits & ACTION_STOP_ON_STOP)
		rc = 2; /* busy */
	else
		VCPU_EVENT(vcpu, 4, "sigp restart %x to handle userspace",
			cpu_addr);
	spin_unlock_bh(&li->lock);
out:
	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->run->s.regs.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->run->s.regs.gprs[base2];

	if (r1 % 2)
		parameter = vcpu->run->s.regs.gprs[r1];
	else
		parameter = vcpu->run->s.regs.gprs[r1 + 1];

	switch (order_code) {
	case SIGP_SENSE:
		vcpu->stat.instruction_sigp_sense++;
		rc = __sigp_sense(vcpu, cpu_addr,
				  &vcpu->run->s.regs.gprs[r1]);
		break;
	case SIGP_EXTERNAL_CALL:
		vcpu->stat.instruction_sigp_external_call++;
		rc = __sigp_external_call(vcpu, cpu_addr);
		break;
	case SIGP_EMERGENCY_SIGNAL:
		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_AND_STORE_STATUS:
		vcpu->stat.instruction_sigp_stop++;
		rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP |
						 ACTION_STOP_ON_STOP);
		break;
	case SIGP_SET_ARCHITECTURE:
		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->run->s.regs.gprs[r1]);
		break;
	case SIGP_SENSE_RUNNING:
		vcpu->stat.instruction_sigp_sense_running++;
		rc = __sigp_sense_running(vcpu, cpu_addr,
					  &vcpu->run->s.regs.gprs[r1]);
		break;
	case SIGP_RESTART:
		vcpu->stat.instruction_sigp_restart++;
		rc = __sigp_restart(vcpu, cpu_addr);
		if (rc == 2) /* busy */
			break;
		/* 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	1	/*
a53c8fab	2	* handling interprocessor communication
5288fbf0	3	*
a53c8fab	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>
a9ae32c3	18	#include <asm/sigp.h>
5288fbf0 CB	19	#include "gaccess.h"
	20	#include "kvm-s390.h"
	21
0096369d	22	static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr,
5a32c1af	23	u64 *reg)
5288fbf0	24	{
180c12fb	25	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
5288fbf0 CB	26	int rc;
	27
	28	if (cpu_addr >= KVM_MAX_VCPUS)
	29	return 3; /* not operational */
	30
b037a4f3	31	spin_lock(&fi->lock);
5288fbf0 CB	32	if (fi->local_int[cpu_addr] == NULL)
5288fbf0 CB	33	rc = 3; /* not operational */
9e6dabef CH	34	else if (!(atomic_read(fi->local_int[cpu_addr]->cpuflags)
9e6dabef CH	35	& CPUSTAT_STOPPED)) {
5288fbf0 CB	36	*reg &= 0xffffffff00000000UL;
	37	rc = 1; /* status stored */
	38	} else {
	39	*reg &= 0xffffffff00000000UL;
a9ae32c3	40	*reg \|= SIGP_STATUS_STOPPED;
5288fbf0 CB	41	rc = 1; /* status stored */
5288fbf0 CB	42	}
b037a4f3	43	spin_unlock(&fi->lock);
5288fbf0 CB	44
	45	VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc);
	46	return rc;
	47	}
	48
	49	static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
	50	{
180c12fb CB	51	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	52	struct kvm_s390_local_interrupt *li;
	53	struct kvm_s390_interrupt_info *inti;
5288fbf0 CB	54	int rc;
	55
	56	if (cpu_addr >= KVM_MAX_VCPUS)
	57	return 3; /* not operational */
	58
	59	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	60	if (!inti)
	61	return -ENOMEM;
	62
	63	inti->type = KVM_S390_INT_EMERGENCY;
7697e71f	64	inti->emerg.code = vcpu->vcpu_id;
5288fbf0	65
b037a4f3	66	spin_lock(&fi->lock);
5288fbf0 CB	67	li = fi->local_int[cpu_addr];
	68	if (li == NULL) {
	69	rc = 3; /* not operational */
	70	kfree(inti);
	71	goto unlock;
	72	}
	73	spin_lock_bh(&li->lock);
	74	list_add_tail(&inti->list, &li->list);
	75	atomic_set(&li->active, 1);
	76	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	77	if (waitqueue_active(&li->wq))
	78	wake_up_interruptible(&li->wq);
	79	spin_unlock_bh(&li->lock);
	80	rc = 0; /* order accepted */
7697e71f CE	81	VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
	82	unlock:
	83	spin_unlock(&fi->lock);
	84	return rc;
	85	}
	86
	87	static int __sigp_external_call(struct kvm_vcpu *vcpu, u16 cpu_addr)
	88	{
	89	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	90	struct kvm_s390_local_interrupt *li;
	91	struct kvm_s390_interrupt_info *inti;
	92	int rc;
	93
	94	if (cpu_addr >= KVM_MAX_VCPUS)
	95	return 3; /* not operational */
	96
	97	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	98	if (!inti)
	99	return -ENOMEM;
	100
	101	inti->type = KVM_S390_INT_EXTERNAL_CALL;
	102	inti->extcall.code = vcpu->vcpu_id;
	103
	104	spin_lock(&fi->lock);
	105	li = fi->local_int[cpu_addr];
	106	if (li == NULL) {
	107	rc = 3; /* not operational */
	108	kfree(inti);
	109	goto unlock;
	110	}
	111	spin_lock_bh(&li->lock);
	112	list_add_tail(&inti->list, &li->list);
	113	atomic_set(&li->active, 1);
	114	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	115	if (waitqueue_active(&li->wq))
	116	wake_up_interruptible(&li->wq);
	117	spin_unlock_bh(&li->lock);
	118	rc = 0; /* order accepted */
	119	VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x", cpu_addr);
5288fbf0	120	unlock:
b037a4f3	121	spin_unlock(&fi->lock);
5288fbf0 CB	122	return rc;
	123	}
	124
9ace903d	125	static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action)
5288fbf0	126	{
180c12fb	127	struct kvm_s390_interrupt_info *inti;
5288fbf0	128
9940fa80	129	inti = kzalloc(sizeof(*inti), GFP_ATOMIC);
5288fbf0 CB	130	if (!inti)
5288fbf0 CB	131	return -ENOMEM;
5288fbf0 CB	132	inti->type = KVM_S390_SIGP_STOP;
5288fbf0 CB	133
5288fbf0	134	spin_lock_bh(&li->lock);
24a13044 JF	135	if ((atomic_read(li->cpuflags) & CPUSTAT_STOPPED))
24a13044 JF	136	goto out;
5288fbf0 CB	137	list_add_tail(&inti->list, &li->list);
	138	atomic_set(&li->active, 1);
	139	atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
9ace903d	140	li->action_bits \|= action;
5288fbf0 CB	141	if (waitqueue_active(&li->wq))
5288fbf0 CB	142	wake_up_interruptible(&li->wq);
24a13044	143	out:
5288fbf0	144	spin_unlock_bh(&li->lock);
9ace903d CE	145
	146	return 0; /* order accepted */
	147	}
	148
	149	static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action)
	150	{
	151	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	152	struct kvm_s390_local_interrupt *li;
	153	int rc;
	154
	155	if (cpu_addr >= KVM_MAX_VCPUS)
	156	return 3; /* not operational */
	157
	158	spin_lock(&fi->lock);
	159	li = fi->local_int[cpu_addr];
	160	if (li == NULL) {
	161	rc = 3; /* not operational */
	162	goto unlock;
	163	}
	164
	165	rc = __inject_sigp_stop(li, action);
	166
5288fbf0	167	unlock:
b037a4f3	168	spin_unlock(&fi->lock);
5288fbf0 CB	169	VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
	170	return rc;
	171	}
	172
9ace903d CE	173	int kvm_s390_inject_sigp_stop(struct kvm_vcpu *vcpu, int action)
	174	{
	175	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	176	return __inject_sigp_stop(li, action);
	177	}
	178
5288fbf0 CB	179	static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
	180	{
	181	int rc;
	182
	183	switch (parameter & 0xff) {
	184	case 0:
5288fbf0 CB	185	rc = 3; /* not operational */
	186	break;
	187	case 1:
	188	case 2:
	189	rc = 0; /* order accepted */
	190	break;
	191	default:
b8e660b8	192	rc = -EOPNOTSUPP;
5288fbf0 CB	193	}
	194	return rc;
	195	}
	196
	197	static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
5a32c1af	198	u64 *reg)
5288fbf0	199	{
180c12fb	200	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
53cb780a	201	struct kvm_s390_local_interrupt *li = NULL;
180c12fb	202	struct kvm_s390_interrupt_info *inti;
5288fbf0 CB	203	int rc;
	204	u8 tmp;
	205
	206	/* make sure that the new value is valid memory */
	207	address = address & 0x7fffe000u;
092670cd CO	208	if (copy_from_guest_absolute(vcpu, &tmp, address, 1) \|\|
092670cd CO	209	copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)) {
a9ae32c3	210	*reg \|= SIGP_STATUS_INVALID_PARAMETER;
5288fbf0 CB	211	return 1; /* invalid parameter */
	212	}
	213
	214	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	215	if (!inti)
	216	return 2; /* busy */
	217
b037a4f3	218	spin_lock(&fi->lock);
53cb780a RK	219	if (cpu_addr < KVM_MAX_VCPUS)
53cb780a RK	220	li = fi->local_int[cpu_addr];
5288fbf0	221
53cb780a	222	if (li == NULL) {
5288fbf0	223	rc = 1; /* incorrect state */
a9ae32c3	224	*reg &= SIGP_STATUS_INCORRECT_STATE;
5288fbf0 CB	225	kfree(inti);
	226	goto out_fi;
	227	}
	228
	229	spin_lock_bh(&li->lock);
	230	/* cpu must be in stopped state */
9e6dabef	231	if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
5288fbf0	232	rc = 1; /* incorrect state */
a9ae32c3	233	*reg &= SIGP_STATUS_INCORRECT_STATE;
5288fbf0 CB	234	kfree(inti);
	235	goto out_li;
	236	}
	237
	238	inti->type = KVM_S390_SIGP_SET_PREFIX;
	239	inti->prefix.address = address;
	240
	241	list_add_tail(&inti->list, &li->list);
	242	atomic_set(&li->active, 1);
	243	if (waitqueue_active(&li->wq))
	244	wake_up_interruptible(&li->wq);
	245	rc = 0; /* order accepted */
	246
	247	VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
	248	out_li:
	249	spin_unlock_bh(&li->lock);
	250	out_fi:
b037a4f3	251	spin_unlock(&fi->lock);
5288fbf0 CB	252	return rc;
	253	}
	254
bd59d3a4	255	static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr,
5a32c1af	256	u64 *reg)
bd59d3a4 CH	257	{
	258	int rc;
	259	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	260
	261	if (cpu_addr >= KVM_MAX_VCPUS)
	262	return 3; /* not operational */
	263
	264	spin_lock(&fi->lock);
	265	if (fi->local_int[cpu_addr] == NULL)
	266	rc = 3; /* not operational */
	267	else {
	268	if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
	269	& CPUSTAT_RUNNING) {
	270	/* running */
	271	rc = 1;
	272	} else {
	273	/* not running */
	274	*reg &= 0xffffffff00000000UL;
a9ae32c3	275	*reg \|= SIGP_STATUS_NOT_RUNNING;
bd59d3a4 CH	276	rc = 0;
	277	}
	278	}
	279	spin_unlock(&fi->lock);
	280
	281	VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x", cpu_addr,
	282	rc);
	283
	284	return rc;
	285	}
	286
151104a7 JF	287	static int __sigp_restart(struct kvm_vcpu *vcpu, u16 cpu_addr)
	288	{
	289	int rc = 0;
	290	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	291	struct kvm_s390_local_interrupt *li;
	292
	293	if (cpu_addr >= KVM_MAX_VCPUS)
	294	return 3; /* not operational */
	295
	296	spin_lock(&fi->lock);
	297	li = fi->local_int[cpu_addr];
	298	if (li == NULL) {
	299	rc = 3; /* not operational */
	300	goto out;
	301	}
	302
	303	spin_lock_bh(&li->lock);
	304	if (li->action_bits & ACTION_STOP_ON_STOP)
	305	rc = 2; /* busy */
	306	else
	307	VCPU_EVENT(vcpu, 4, "sigp restart %x to handle userspace",
	308	cpu_addr);
	309	spin_unlock_bh(&li->lock);
	310	out:
	311	spin_unlock(&fi->lock);
	312	return rc;
	313	}
	314
5288fbf0 CB	315	int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
	316	{
	317	int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
	318	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
	319	int base2 = vcpu->arch.sie_block->ipb >> 28;
	320	int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
	321	u32 parameter;
5a32c1af	322	u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
5288fbf0 CB	323	u8 order_code;
	324	int rc;
	325
3eb77d51 CB	326	/* sigp in userspace can exit */
	327	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
	328	return kvm_s390_inject_program_int(vcpu,
	329	PGM_PRIVILEGED_OPERATION);
	330
5288fbf0 CB	331	order_code = disp2;
5288fbf0 CB	332	if (base2)
5a32c1af	333	order_code += vcpu->run->s.regs.gprs[base2];
5288fbf0 CB	334
5288fbf0 CB	335	if (r1 % 2)
5a32c1af	336	parameter = vcpu->run->s.regs.gprs[r1];
5288fbf0	337	else
5a32c1af	338	parameter = vcpu->run->s.regs.gprs[r1 + 1];
5288fbf0 CB	339
	340	switch (order_code) {
	341	case SIGP_SENSE:
	342	vcpu->stat.instruction_sigp_sense++;
	343	rc = __sigp_sense(vcpu, cpu_addr,
5a32c1af	344	&vcpu->run->s.regs.gprs[r1]);
5288fbf0	345	break;
7697e71f CE	346	case SIGP_EXTERNAL_CALL:
	347	vcpu->stat.instruction_sigp_external_call++;
	348	rc = __sigp_external_call(vcpu, cpu_addr);
	349	break;
a9ae32c3	350	case SIGP_EMERGENCY_SIGNAL:
5288fbf0 CB	351	vcpu->stat.instruction_sigp_emergency++;
	352	rc = __sigp_emergency(vcpu, cpu_addr);
	353	break;
	354	case SIGP_STOP:
	355	vcpu->stat.instruction_sigp_stop++;
9ace903d	356	rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP);
5288fbf0	357	break;
a9ae32c3	358	case SIGP_STOP_AND_STORE_STATUS:
5288fbf0	359	vcpu->stat.instruction_sigp_stop++;
9ec2d6dc JF	360	rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP \|
9ec2d6dc JF	361	ACTION_STOP_ON_STOP);
5288fbf0	362	break;
a9ae32c3	363	case SIGP_SET_ARCHITECTURE:
5288fbf0 CB	364	vcpu->stat.instruction_sigp_arch++;
	365	rc = __sigp_set_arch(vcpu, parameter);
	366	break;
	367	case SIGP_SET_PREFIX:
	368	vcpu->stat.instruction_sigp_prefix++;
	369	rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
5a32c1af	370	&vcpu->run->s.regs.gprs[r1]);
5288fbf0	371	break;
bd59d3a4 CH	372	case SIGP_SENSE_RUNNING:
	373	vcpu->stat.instruction_sigp_sense_running++;
	374	rc = __sigp_sense_running(vcpu, cpu_addr,
5a32c1af	375	&vcpu->run->s.regs.gprs[r1]);
bd59d3a4	376	break;
5288fbf0 CB	377	case SIGP_RESTART:
5288fbf0 CB	378	vcpu->stat.instruction_sigp_restart++;
151104a7 JF	379	rc = __sigp_restart(vcpu, cpu_addr);
	380	if (rc == 2) /* busy */
	381	break;
5288fbf0 CB	382	/* user space must know about restart */
5288fbf0 CB	383	default:
b8e660b8	384	return -EOPNOTSUPP;
5288fbf0 CB	385	}
	386
	387	if (rc < 0)
	388	return rc;
	389
	390	vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
	391	vcpu->arch.sie_block->gpsw.mask \|= (rc & 3ul) << 44;
	392	return 0;
	393	}