[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
#define SIGP_SENSE_RUNNING     0x15

/* cpu status bits */
#define SIGP_STAT_EQUIPMENT_CHECK   0x80000000UL
#define SIGP_STAT_NOT_RUNNING	    0x00000400UL
#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,
			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_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;
	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_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_STOPPED)) {
		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;
}

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_STAT_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:
		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 |
						 ACTION_STOP_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->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 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
bd59d3a4	34	#define SIGP_SENSE_RUNNING 0x15
5288fbf0 CB	35
	36	/* cpu status bits */
	37	#define SIGP_STAT_EQUIPMENT_CHECK 0x80000000UL
bd59d3a4	38	#define SIGP_STAT_NOT_RUNNING 0x00000400UL
5288fbf0 CB	39	#define SIGP_STAT_INCORRECT_STATE 0x00000200UL
	40	#define SIGP_STAT_INVALID_PARAMETER 0x00000100UL
	41	#define SIGP_STAT_EXT_CALL_PENDING 0x00000080UL
	42	#define SIGP_STAT_STOPPED 0x00000040UL
	43	#define SIGP_STAT_OPERATOR_INTERV 0x00000020UL
	44	#define SIGP_STAT_CHECK_STOP 0x00000010UL
	45	#define SIGP_STAT_INOPERATIVE 0x00000004UL
	46	#define SIGP_STAT_INVALID_ORDER 0x00000002UL
	47	#define SIGP_STAT_RECEIVER_CHECK 0x00000001UL
	48
	49
0096369d	50	static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr,
5a32c1af	51	u64 *reg)
5288fbf0	52	{
180c12fb	53	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
5288fbf0 CB	54	int rc;
	55
	56	if (cpu_addr >= KVM_MAX_VCPUS)
	57	return 3; /* not operational */
	58
b037a4f3	59	spin_lock(&fi->lock);
5288fbf0 CB	60	if (fi->local_int[cpu_addr] == NULL)
5288fbf0 CB	61	rc = 3; /* not operational */
9e6dabef CH	62	else if (!(atomic_read(fi->local_int[cpu_addr]->cpuflags)
9e6dabef CH	63	& CPUSTAT_STOPPED)) {
5288fbf0 CB	64	*reg &= 0xffffffff00000000UL;
	65	rc = 1; /* status stored */
	66	} else {
	67	*reg &= 0xffffffff00000000UL;
	68	*reg \|= SIGP_STAT_STOPPED;
	69	rc = 1; /* status stored */
	70	}
b037a4f3	71	spin_unlock(&fi->lock);
5288fbf0 CB	72
	73	VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc);
	74	return rc;
	75	}
	76
	77	static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
	78	{
180c12fb CB	79	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	80	struct kvm_s390_local_interrupt *li;
	81	struct kvm_s390_interrupt_info *inti;
5288fbf0 CB	82	int rc;
	83
	84	if (cpu_addr >= KVM_MAX_VCPUS)
	85	return 3; /* not operational */
	86
	87	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	88	if (!inti)
	89	return -ENOMEM;
	90
	91	inti->type = KVM_S390_INT_EMERGENCY;
7697e71f	92	inti->emerg.code = vcpu->vcpu_id;
5288fbf0	93
b037a4f3	94	spin_lock(&fi->lock);
5288fbf0 CB	95	li = fi->local_int[cpu_addr];
	96	if (li == NULL) {
	97	rc = 3; /* not operational */
	98	kfree(inti);
	99	goto unlock;
	100	}
	101	spin_lock_bh(&li->lock);
	102	list_add_tail(&inti->list, &li->list);
	103	atomic_set(&li->active, 1);
	104	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	105	if (waitqueue_active(&li->wq))
	106	wake_up_interruptible(&li->wq);
	107	spin_unlock_bh(&li->lock);
	108	rc = 0; /* order accepted */
7697e71f CE	109	VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
	110	unlock:
	111	spin_unlock(&fi->lock);
	112	return rc;
	113	}
	114
	115	static int __sigp_external_call(struct kvm_vcpu *vcpu, u16 cpu_addr)
	116	{
	117	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	118	struct kvm_s390_local_interrupt *li;
	119	struct kvm_s390_interrupt_info *inti;
	120	int rc;
	121
	122	if (cpu_addr >= KVM_MAX_VCPUS)
	123	return 3; /* not operational */
	124
	125	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	126	if (!inti)
	127	return -ENOMEM;
	128
	129	inti->type = KVM_S390_INT_EXTERNAL_CALL;
	130	inti->extcall.code = vcpu->vcpu_id;
	131
	132	spin_lock(&fi->lock);
	133	li = fi->local_int[cpu_addr];
	134	if (li == NULL) {
	135	rc = 3; /* not operational */
	136	kfree(inti);
	137	goto unlock;
	138	}
	139	spin_lock_bh(&li->lock);
	140	list_add_tail(&inti->list, &li->list);
	141	atomic_set(&li->active, 1);
	142	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	143	if (waitqueue_active(&li->wq))
	144	wake_up_interruptible(&li->wq);
	145	spin_unlock_bh(&li->lock);
	146	rc = 0; /* order accepted */
	147	VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x", cpu_addr);
5288fbf0	148	unlock:
b037a4f3	149	spin_unlock(&fi->lock);
5288fbf0 CB	150	return rc;
	151	}
	152
9ace903d	153	static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action)
5288fbf0	154	{
180c12fb	155	struct kvm_s390_interrupt_info *inti;
5288fbf0	156
9940fa80	157	inti = kzalloc(sizeof(*inti), GFP_ATOMIC);
5288fbf0 CB	158	if (!inti)
5288fbf0 CB	159	return -ENOMEM;
5288fbf0 CB	160	inti->type = KVM_S390_SIGP_STOP;
5288fbf0 CB	161
5288fbf0	162	spin_lock_bh(&li->lock);
24a13044 JF	163	if ((atomic_read(li->cpuflags) & CPUSTAT_STOPPED))
24a13044 JF	164	goto out;
5288fbf0 CB	165	list_add_tail(&inti->list, &li->list);
	166	atomic_set(&li->active, 1);
	167	atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
9ace903d	168	li->action_bits \|= action;
5288fbf0 CB	169	if (waitqueue_active(&li->wq))
5288fbf0 CB	170	wake_up_interruptible(&li->wq);
24a13044	171	out:
5288fbf0	172	spin_unlock_bh(&li->lock);
9ace903d CE	173
	174	return 0; /* order accepted */
	175	}
	176
	177	static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action)
	178	{
	179	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	180	struct kvm_s390_local_interrupt *li;
	181	int rc;
	182
	183	if (cpu_addr >= KVM_MAX_VCPUS)
	184	return 3; /* not operational */
	185
	186	spin_lock(&fi->lock);
	187	li = fi->local_int[cpu_addr];
	188	if (li == NULL) {
	189	rc = 3; /* not operational */
	190	goto unlock;
	191	}
	192
	193	rc = __inject_sigp_stop(li, action);
	194
5288fbf0	195	unlock:
b037a4f3	196	spin_unlock(&fi->lock);
5288fbf0 CB	197	VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
	198	return rc;
	199	}
	200
9ace903d CE	201	int kvm_s390_inject_sigp_stop(struct kvm_vcpu *vcpu, int action)
	202	{
	203	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	204	return __inject_sigp_stop(li, action);
	205	}
	206
5288fbf0 CB	207	static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
	208	{
	209	int rc;
	210
	211	switch (parameter & 0xff) {
	212	case 0:
5288fbf0 CB	213	rc = 3; /* not operational */
	214	break;
	215	case 1:
	216	case 2:
	217	rc = 0; /* order accepted */
	218	break;
	219	default:
b8e660b8	220	rc = -EOPNOTSUPP;
5288fbf0 CB	221	}
	222	return rc;
	223	}
	224
	225	static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
5a32c1af	226	u64 *reg)
5288fbf0	227	{
180c12fb	228	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
53cb780a	229	struct kvm_s390_local_interrupt *li = NULL;
180c12fb	230	struct kvm_s390_interrupt_info *inti;
5288fbf0 CB	231	int rc;
	232	u8 tmp;
	233
	234	/* make sure that the new value is valid memory */
	235	address = address & 0x7fffe000u;
092670cd CO	236	if (copy_from_guest_absolute(vcpu, &tmp, address, 1) \|\|
092670cd CO	237	copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)) {
5288fbf0 CB	238	*reg \|= SIGP_STAT_INVALID_PARAMETER;
	239	return 1; /* invalid parameter */
	240	}
	241
	242	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	243	if (!inti)
	244	return 2; /* busy */
	245
b037a4f3	246	spin_lock(&fi->lock);
53cb780a RK	247	if (cpu_addr < KVM_MAX_VCPUS)
53cb780a RK	248	li = fi->local_int[cpu_addr];
5288fbf0	249
53cb780a	250	if (li == NULL) {
5288fbf0 CB	251	rc = 1; /* incorrect state */
	252	*reg &= SIGP_STAT_INCORRECT_STATE;
	253	kfree(inti);
	254	goto out_fi;
	255	}
	256
	257	spin_lock_bh(&li->lock);
	258	/* cpu must be in stopped state */
9e6dabef	259	if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
5288fbf0 CB	260	rc = 1; /* incorrect state */
	261	*reg &= SIGP_STAT_INCORRECT_STATE;
	262	kfree(inti);
	263	goto out_li;
	264	}
	265
	266	inti->type = KVM_S390_SIGP_SET_PREFIX;
	267	inti->prefix.address = address;
	268
	269	list_add_tail(&inti->list, &li->list);
	270	atomic_set(&li->active, 1);
	271	if (waitqueue_active(&li->wq))
	272	wake_up_interruptible(&li->wq);
	273	rc = 0; /* order accepted */
	274
	275	VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
	276	out_li:
	277	spin_unlock_bh(&li->lock);
	278	out_fi:
b037a4f3	279	spin_unlock(&fi->lock);
5288fbf0 CB	280	return rc;
	281	}
	282
bd59d3a4	283	static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr,
5a32c1af	284	u64 *reg)
bd59d3a4 CH	285	{
	286	int rc;
	287	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	288
	289	if (cpu_addr >= KVM_MAX_VCPUS)
	290	return 3; /* not operational */
	291
	292	spin_lock(&fi->lock);
	293	if (fi->local_int[cpu_addr] == NULL)
	294	rc = 3; /* not operational */
	295	else {
	296	if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
	297	& CPUSTAT_RUNNING) {
	298	/* running */
	299	rc = 1;
	300	} else {
	301	/* not running */
	302	*reg &= 0xffffffff00000000UL;
	303	*reg \|= SIGP_STAT_NOT_RUNNING;
	304	rc = 0;
	305	}
	306	}
	307	spin_unlock(&fi->lock);
	308
	309	VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x", cpu_addr,
	310	rc);
	311
	312	return rc;
	313	}
	314
151104a7 JF	315	static int __sigp_restart(struct kvm_vcpu *vcpu, u16 cpu_addr)
	316	{
	317	int rc = 0;
	318	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	319	struct kvm_s390_local_interrupt *li;
	320
	321	if (cpu_addr >= KVM_MAX_VCPUS)
	322	return 3; /* not operational */
	323
	324	spin_lock(&fi->lock);
	325	li = fi->local_int[cpu_addr];
	326	if (li == NULL) {
	327	rc = 3; /* not operational */
	328	goto out;
	329	}
	330
	331	spin_lock_bh(&li->lock);
	332	if (li->action_bits & ACTION_STOP_ON_STOP)
	333	rc = 2; /* busy */
	334	else
	335	VCPU_EVENT(vcpu, 4, "sigp restart %x to handle userspace",
	336	cpu_addr);
	337	spin_unlock_bh(&li->lock);
	338	out:
	339	spin_unlock(&fi->lock);
	340	return rc;
	341	}
	342
5288fbf0 CB	343	int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
	344	{
	345	int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
	346	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
	347	int base2 = vcpu->arch.sie_block->ipb >> 28;
	348	int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
	349	u32 parameter;
5a32c1af	350	u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
5288fbf0 CB	351	u8 order_code;
	352	int rc;
	353
3eb77d51 CB	354	/* sigp in userspace can exit */
	355	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
	356	return kvm_s390_inject_program_int(vcpu,
	357	PGM_PRIVILEGED_OPERATION);
	358
5288fbf0 CB	359	order_code = disp2;
5288fbf0 CB	360	if (base2)
5a32c1af	361	order_code += vcpu->run->s.regs.gprs[base2];
5288fbf0 CB	362
5288fbf0 CB	363	if (r1 % 2)
5a32c1af	364	parameter = vcpu->run->s.regs.gprs[r1];
5288fbf0	365	else
5a32c1af	366	parameter = vcpu->run->s.regs.gprs[r1 + 1];
5288fbf0 CB	367
	368	switch (order_code) {
	369	case SIGP_SENSE:
	370	vcpu->stat.instruction_sigp_sense++;
	371	rc = __sigp_sense(vcpu, cpu_addr,
5a32c1af	372	&vcpu->run->s.regs.gprs[r1]);
5288fbf0	373	break;
7697e71f CE	374	case SIGP_EXTERNAL_CALL:
	375	vcpu->stat.instruction_sigp_external_call++;
	376	rc = __sigp_external_call(vcpu, cpu_addr);
	377	break;
5288fbf0 CB	378	case SIGP_EMERGENCY:
	379	vcpu->stat.instruction_sigp_emergency++;
	380	rc = __sigp_emergency(vcpu, cpu_addr);
	381	break;
	382	case SIGP_STOP:
	383	vcpu->stat.instruction_sigp_stop++;
9ace903d	384	rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP);
5288fbf0 CB	385	break;
	386	case SIGP_STOP_STORE_STATUS:
	387	vcpu->stat.instruction_sigp_stop++;
9ec2d6dc JF	388	rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP \|
9ec2d6dc JF	389	ACTION_STOP_ON_STOP);
5288fbf0 CB	390	break;
	391	case SIGP_SET_ARCH:
	392	vcpu->stat.instruction_sigp_arch++;
	393	rc = __sigp_set_arch(vcpu, parameter);
	394	break;
	395	case SIGP_SET_PREFIX:
	396	vcpu->stat.instruction_sigp_prefix++;
	397	rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
5a32c1af	398	&vcpu->run->s.regs.gprs[r1]);
5288fbf0	399	break;
bd59d3a4 CH	400	case SIGP_SENSE_RUNNING:
	401	vcpu->stat.instruction_sigp_sense_running++;
	402	rc = __sigp_sense_running(vcpu, cpu_addr,
5a32c1af	403	&vcpu->run->s.regs.gprs[r1]);
bd59d3a4	404	break;
5288fbf0 CB	405	case SIGP_RESTART:
5288fbf0 CB	406	vcpu->stat.instruction_sigp_restart++;
151104a7 JF	407	rc = __sigp_restart(vcpu, cpu_addr);
	408	if (rc == 2) /* busy */
	409	break;
5288fbf0 CB	410	/* user space must know about restart */
5288fbf0 CB	411	default:
b8e660b8	412	return -EOPNOTSUPP;
5288fbf0 CB	413	}
	414
	415	if (rc < 0)
	416	return rc;
	417
	418	vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
	419	vcpu->arch.sie_block->gpsw.mask \|= (rc & 3ul) << 44;
	420	return 0;
	421	}