[deliverable/linux.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"
#include "trace.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 SIGP_CC_NOT_OPERATIONAL;

	spin_lock(&fi->lock);
	if (fi->local_int[cpu_addr] == NULL)
		rc = SIGP_CC_NOT_OPERATIONAL;
	else if (!(atomic_read(fi->local_int[cpu_addr]->cpuflags)
		   & (CPUSTAT_ECALL_PEND | CPUSTAT_STOPPED)))
		rc = SIGP_CC_ORDER_CODE_ACCEPTED;
	else {
		*reg &= 0xffffffff00000000UL;
		if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
		    & CPUSTAT_ECALL_PEND)
			*reg |= SIGP_STATUS_EXT_CALL_PENDING;
		if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
		    & CPUSTAT_STOPPED)
			*reg |= SIGP_STATUS_STOPPED;
		rc = SIGP_CC_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 SIGP_CC_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 = SIGP_CC_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 = SIGP_CC_ORDER_CODE_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 SIGP_CC_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 = SIGP_CC_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 = SIGP_CC_ORDER_CODE_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)) {
		kfree(inti);
		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 SIGP_CC_ORDER_CODE_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 SIGP_CC_NOT_OPERATIONAL;

	spin_lock(&fi->lock);
	li = fi->local_int[cpu_addr];
	if (li == NULL) {
		rc = SIGP_CC_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 = SIGP_CC_NOT_OPERATIONAL;
		break;
	case 1:
	case 2:
		rc = SIGP_CC_ORDER_CODE_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 &= 0xffffffff00000000UL;
		*reg |= SIGP_STATUS_INVALID_PARAMETER;
		return SIGP_CC_STATUS_STORED;
	}

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

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

	if (li == NULL) {
		*reg &= 0xffffffff00000000UL;
		*reg |= SIGP_STATUS_INCORRECT_STATE;
		rc = SIGP_CC_STATUS_STORED;
		kfree(inti);
		goto out_fi;
	}

	spin_lock_bh(&li->lock);
	/* cpu must be in stopped state */
	if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
		*reg &= 0xffffffff00000000UL;
		*reg |= SIGP_STATUS_INCORRECT_STATE;
		rc = SIGP_CC_STATUS_STORED;
		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 = SIGP_CC_ORDER_CODE_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 SIGP_CC_NOT_OPERATIONAL;

	spin_lock(&fi->lock);
	if (fi->local_int[cpu_addr] == NULL)
		rc = SIGP_CC_NOT_OPERATIONAL;
	else {
		if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
		    & CPUSTAT_RUNNING) {
			/* running */
			rc = SIGP_CC_ORDER_CODE_ACCEPTED;
		} else {
			/* not running */
			*reg &= 0xffffffff00000000UL;
			*reg |= SIGP_STATUS_NOT_RUNNING;
			rc = SIGP_CC_STATUS_STORED;
		}
	}
	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)
{
	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	struct kvm_s390_local_interrupt *li;
	int rc = SIGP_CC_ORDER_CODE_ACCEPTED;

	if (cpu_addr >= KVM_MAX_VCPUS)
		return SIGP_CC_NOT_OPERATIONAL;

	spin_lock(&fi->lock);
	li = fi->local_int[cpu_addr];
	if (li == NULL) {
		rc = SIGP_CC_NOT_OPERATIONAL;
		goto out;
	}

	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);
	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;
	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 = kvm_s390_get_base_disp_rs(vcpu);

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

	trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter);
	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 == SIGP_CC_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"
5288fbf0 CB	20	#include "kvm-s390.h"
5786fffa	21	#include "trace.h"
5288fbf0	22
0096369d	23	static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr,
5a32c1af	24	u64 *reg)
5288fbf0	25	{
180c12fb	26	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
5288fbf0 CB	27	int rc;
	28
	29	if (cpu_addr >= KVM_MAX_VCPUS)
ea1918dd	30	return SIGP_CC_NOT_OPERATIONAL;
5288fbf0	31
b037a4f3	32	spin_lock(&fi->lock);
5288fbf0	33	if (fi->local_int[cpu_addr] == NULL)
ea1918dd	34	rc = SIGP_CC_NOT_OPERATIONAL;
9e6dabef	35	else if (!(atomic_read(fi->local_int[cpu_addr]->cpuflags)
21b26c08 CH	36	& (CPUSTAT_ECALL_PEND \| CPUSTAT_STOPPED)))
	37	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
	38	else {
5288fbf0	39	*reg &= 0xffffffff00000000UL;
21b26c08 CH	40	if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
	41	& CPUSTAT_ECALL_PEND)
	42	*reg \|= SIGP_STATUS_EXT_CALL_PENDING;
	43	if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
	44	& CPUSTAT_STOPPED)
	45	*reg \|= SIGP_STATUS_STOPPED;
ea1918dd	46	rc = SIGP_CC_STATUS_STORED;
5288fbf0	47	}
b037a4f3	48	spin_unlock(&fi->lock);
5288fbf0 CB	49
	50	VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc);
	51	return rc;
	52	}
	53
	54	static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
	55	{
180c12fb CB	56	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	57	struct kvm_s390_local_interrupt *li;
	58	struct kvm_s390_interrupt_info *inti;
5288fbf0 CB	59	int rc;
	60
	61	if (cpu_addr >= KVM_MAX_VCPUS)
ea1918dd	62	return SIGP_CC_NOT_OPERATIONAL;
5288fbf0 CB	63
	64	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	65	if (!inti)
	66	return -ENOMEM;
	67
	68	inti->type = KVM_S390_INT_EMERGENCY;
7697e71f	69	inti->emerg.code = vcpu->vcpu_id;
5288fbf0	70
b037a4f3	71	spin_lock(&fi->lock);
5288fbf0 CB	72	li = fi->local_int[cpu_addr];
5288fbf0 CB	73	if (li == NULL) {
ea1918dd	74	rc = SIGP_CC_NOT_OPERATIONAL;
5288fbf0 CB	75	kfree(inti);
	76	goto unlock;
	77	}
	78	spin_lock_bh(&li->lock);
	79	list_add_tail(&inti->list, &li->list);
	80	atomic_set(&li->active, 1);
	81	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	82	if (waitqueue_active(&li->wq))
	83	wake_up_interruptible(&li->wq);
	84	spin_unlock_bh(&li->lock);
ea1918dd	85	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
7697e71f CE	86	VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
	87	unlock:
	88	spin_unlock(&fi->lock);
	89	return rc;
	90	}
	91
	92	static int __sigp_external_call(struct kvm_vcpu *vcpu, u16 cpu_addr)
	93	{
	94	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	95	struct kvm_s390_local_interrupt *li;
	96	struct kvm_s390_interrupt_info *inti;
	97	int rc;
	98
	99	if (cpu_addr >= KVM_MAX_VCPUS)
ea1918dd	100	return SIGP_CC_NOT_OPERATIONAL;
7697e71f CE	101
	102	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	103	if (!inti)
	104	return -ENOMEM;
	105
	106	inti->type = KVM_S390_INT_EXTERNAL_CALL;
	107	inti->extcall.code = vcpu->vcpu_id;
	108
	109	spin_lock(&fi->lock);
	110	li = fi->local_int[cpu_addr];
	111	if (li == NULL) {
ea1918dd	112	rc = SIGP_CC_NOT_OPERATIONAL;
7697e71f CE	113	kfree(inti);
	114	goto unlock;
	115	}
	116	spin_lock_bh(&li->lock);
	117	list_add_tail(&inti->list, &li->list);
	118	atomic_set(&li->active, 1);
	119	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	120	if (waitqueue_active(&li->wq))
	121	wake_up_interruptible(&li->wq);
	122	spin_unlock_bh(&li->lock);
ea1918dd	123	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
7697e71f	124	VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x", cpu_addr);
5288fbf0	125	unlock:
b037a4f3	126	spin_unlock(&fi->lock);
5288fbf0 CB	127	return rc;
	128	}
	129
9ace903d	130	static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action)
5288fbf0	131	{
180c12fb	132	struct kvm_s390_interrupt_info *inti;
5288fbf0	133
9940fa80	134	inti = kzalloc(sizeof(*inti), GFP_ATOMIC);
5288fbf0 CB	135	if (!inti)
5288fbf0 CB	136	return -ENOMEM;
5288fbf0 CB	137	inti->type = KVM_S390_SIGP_STOP;
5288fbf0 CB	138
5288fbf0	139	spin_lock_bh(&li->lock);
a046b816 CD	140	if ((atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
a046b816 CD	141	kfree(inti);
24a13044	142	goto out;
a046b816	143	}
5288fbf0 CB	144	list_add_tail(&inti->list, &li->list);
	145	atomic_set(&li->active, 1);
	146	atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
9ace903d	147	li->action_bits \|= action;
5288fbf0 CB	148	if (waitqueue_active(&li->wq))
5288fbf0 CB	149	wake_up_interruptible(&li->wq);
24a13044	150	out:
5288fbf0	151	spin_unlock_bh(&li->lock);
9ace903d	152
ea1918dd	153	return SIGP_CC_ORDER_CODE_ACCEPTED;
9ace903d CE	154	}
	155
	156	static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action)
	157	{
	158	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	159	struct kvm_s390_local_interrupt *li;
	160	int rc;
	161
	162	if (cpu_addr >= KVM_MAX_VCPUS)
ea1918dd	163	return SIGP_CC_NOT_OPERATIONAL;
9ace903d CE	164
	165	spin_lock(&fi->lock);
	166	li = fi->local_int[cpu_addr];
	167	if (li == NULL) {
ea1918dd	168	rc = SIGP_CC_NOT_OPERATIONAL;
9ace903d CE	169	goto unlock;
	170	}
	171
	172	rc = __inject_sigp_stop(li, action);
	173
5288fbf0	174	unlock:
b037a4f3	175	spin_unlock(&fi->lock);
5288fbf0 CB	176	VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
	177	return rc;
	178	}
	179
9ace903d CE	180	int kvm_s390_inject_sigp_stop(struct kvm_vcpu *vcpu, int action)
	181	{
	182	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	183	return __inject_sigp_stop(li, action);
	184	}
	185
5288fbf0 CB	186	static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
	187	{
	188	int rc;
	189
	190	switch (parameter & 0xff) {
	191	case 0:
ea1918dd	192	rc = SIGP_CC_NOT_OPERATIONAL;
5288fbf0 CB	193	break;
	194	case 1:
	195	case 2:
ea1918dd	196	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0 CB	197	break;
5288fbf0 CB	198	default:
b8e660b8	199	rc = -EOPNOTSUPP;
5288fbf0 CB	200	}
	201	return rc;
	202	}
	203
	204	static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
5a32c1af	205	u64 *reg)
5288fbf0	206	{
180c12fb	207	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
53cb780a	208	struct kvm_s390_local_interrupt *li = NULL;
180c12fb	209	struct kvm_s390_interrupt_info *inti;
5288fbf0 CB	210	int rc;
	211	u8 tmp;
	212
	213	/* make sure that the new value is valid memory */
	214	address = address & 0x7fffe000u;
092670cd CO	215	if (copy_from_guest_absolute(vcpu, &tmp, address, 1) \|\|
092670cd CO	216	copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)) {
0744426e	217	*reg &= 0xffffffff00000000UL;
a9ae32c3	218	*reg \|= SIGP_STATUS_INVALID_PARAMETER;
ea1918dd	219	return SIGP_CC_STATUS_STORED;
5288fbf0 CB	220	}
	221
	222	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	223	if (!inti)
ea1918dd	224	return SIGP_CC_BUSY;
5288fbf0	225
b037a4f3	226	spin_lock(&fi->lock);
53cb780a RK	227	if (cpu_addr < KVM_MAX_VCPUS)
53cb780a RK	228	li = fi->local_int[cpu_addr];
5288fbf0	229
53cb780a	230	if (li == NULL) {
0744426e HC	231	*reg &= 0xffffffff00000000UL;
0744426e HC	232	*reg \|= SIGP_STATUS_INCORRECT_STATE;
ea1918dd	233	rc = SIGP_CC_STATUS_STORED;
5288fbf0 CB	234	kfree(inti);
	235	goto out_fi;
	236	}
	237
	238	spin_lock_bh(&li->lock);
	239	/* cpu must be in stopped state */
9e6dabef	240	if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
0744426e HC	241	*reg &= 0xffffffff00000000UL;
0744426e HC	242	*reg \|= SIGP_STATUS_INCORRECT_STATE;
ea1918dd	243	rc = SIGP_CC_STATUS_STORED;
5288fbf0 CB	244	kfree(inti);
	245	goto out_li;
	246	}
	247
	248	inti->type = KVM_S390_SIGP_SET_PREFIX;
	249	inti->prefix.address = address;
	250
	251	list_add_tail(&inti->list, &li->list);
	252	atomic_set(&li->active, 1);
	253	if (waitqueue_active(&li->wq))
	254	wake_up_interruptible(&li->wq);
ea1918dd	255	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0 CB	256
	257	VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
	258	out_li:
	259	spin_unlock_bh(&li->lock);
	260	out_fi:
b037a4f3	261	spin_unlock(&fi->lock);
5288fbf0 CB	262	return rc;
	263	}
	264
bd59d3a4	265	static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr,
5a32c1af	266	u64 *reg)
bd59d3a4 CH	267	{
	268	int rc;
	269	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	270
	271	if (cpu_addr >= KVM_MAX_VCPUS)
ea1918dd	272	return SIGP_CC_NOT_OPERATIONAL;
bd59d3a4 CH	273
	274	spin_lock(&fi->lock);
	275	if (fi->local_int[cpu_addr] == NULL)
ea1918dd	276	rc = SIGP_CC_NOT_OPERATIONAL;
bd59d3a4 CH	277	else {
	278	if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
	279	& CPUSTAT_RUNNING) {
	280	/* running */
ea1918dd	281	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
bd59d3a4 CH	282	} else {
	283	/* not running */
	284	*reg &= 0xffffffff00000000UL;
a9ae32c3	285	*reg \|= SIGP_STATUS_NOT_RUNNING;
ea1918dd	286	rc = SIGP_CC_STATUS_STORED;
bd59d3a4 CH	287	}
	288	}
	289	spin_unlock(&fi->lock);
	290
	291	VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x", cpu_addr,
	292	rc);
	293
	294	return rc;
	295	}
	296
151104a7 JF	297	static int __sigp_restart(struct kvm_vcpu *vcpu, u16 cpu_addr)
151104a7 JF	298	{
151104a7 JF	299	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
151104a7 JF	300	struct kvm_s390_local_interrupt *li;
ea1918dd	301	int rc = SIGP_CC_ORDER_CODE_ACCEPTED;
151104a7 JF	302
151104a7 JF	303	if (cpu_addr >= KVM_MAX_VCPUS)
ea1918dd	304	return SIGP_CC_NOT_OPERATIONAL;
151104a7 JF	305
	306	spin_lock(&fi->lock);
	307	li = fi->local_int[cpu_addr];
	308	if (li == NULL) {
ea1918dd	309	rc = SIGP_CC_NOT_OPERATIONAL;
151104a7 JF	310	goto out;
	311	}
	312
	313	spin_lock_bh(&li->lock);
	314	if (li->action_bits & ACTION_STOP_ON_STOP)
ea1918dd	315	rc = SIGP_CC_BUSY;
151104a7 JF	316	else
	317	VCPU_EVENT(vcpu, 4, "sigp restart %x to handle userspace",
	318	cpu_addr);
	319	spin_unlock_bh(&li->lock);
	320	out:
	321	spin_unlock(&fi->lock);
	322	return rc;
	323	}
	324
5288fbf0 CB	325	int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
	326	{
	327	int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
	328	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
5288fbf0	329	u32 parameter;
5a32c1af	330	u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
5288fbf0 CB	331	u8 order_code;
	332	int rc;
	333
3eb77d51 CB	334	/* sigp in userspace can exit */
	335	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
	336	return kvm_s390_inject_program_int(vcpu,
	337	PGM_PRIVILEGED_OPERATION);
	338
b1c571a5	339	order_code = kvm_s390_get_base_disp_rs(vcpu);
5288fbf0 CB	340
5288fbf0 CB	341	if (r1 % 2)
5a32c1af	342	parameter = vcpu->run->s.regs.gprs[r1];
5288fbf0	343	else
5a32c1af	344	parameter = vcpu->run->s.regs.gprs[r1 + 1];
5288fbf0	345
5786fffa	346	trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter);
5288fbf0 CB	347	switch (order_code) {
	348	case SIGP_SENSE:
	349	vcpu->stat.instruction_sigp_sense++;
	350	rc = __sigp_sense(vcpu, cpu_addr,
5a32c1af	351	&vcpu->run->s.regs.gprs[r1]);
5288fbf0	352	break;
7697e71f CE	353	case SIGP_EXTERNAL_CALL:
	354	vcpu->stat.instruction_sigp_external_call++;
	355	rc = __sigp_external_call(vcpu, cpu_addr);
	356	break;
a9ae32c3	357	case SIGP_EMERGENCY_SIGNAL:
5288fbf0 CB	358	vcpu->stat.instruction_sigp_emergency++;
	359	rc = __sigp_emergency(vcpu, cpu_addr);
	360	break;
	361	case SIGP_STOP:
	362	vcpu->stat.instruction_sigp_stop++;
9ace903d	363	rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP);
5288fbf0	364	break;
a9ae32c3	365	case SIGP_STOP_AND_STORE_STATUS:
5288fbf0	366	vcpu->stat.instruction_sigp_stop++;
9ec2d6dc JF	367	rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP \|
9ec2d6dc JF	368	ACTION_STOP_ON_STOP);
5288fbf0	369	break;
a9ae32c3	370	case SIGP_SET_ARCHITECTURE:
5288fbf0 CB	371	vcpu->stat.instruction_sigp_arch++;
	372	rc = __sigp_set_arch(vcpu, parameter);
	373	break;
	374	case SIGP_SET_PREFIX:
	375	vcpu->stat.instruction_sigp_prefix++;
	376	rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
5a32c1af	377	&vcpu->run->s.regs.gprs[r1]);
5288fbf0	378	break;
bd59d3a4 CH	379	case SIGP_SENSE_RUNNING:
	380	vcpu->stat.instruction_sigp_sense_running++;
	381	rc = __sigp_sense_running(vcpu, cpu_addr,
5a32c1af	382	&vcpu->run->s.regs.gprs[r1]);
bd59d3a4	383	break;
5288fbf0 CB	384	case SIGP_RESTART:
5288fbf0 CB	385	vcpu->stat.instruction_sigp_restart++;
151104a7	386	rc = __sigp_restart(vcpu, cpu_addr);
ea1918dd	387	if (rc == SIGP_CC_BUSY)
151104a7	388	break;
5288fbf0 CB	389	/* user space must know about restart */
5288fbf0 CB	390	default:
b8e660b8	391	return -EOPNOTSUPP;
5288fbf0 CB	392	}
	393
	394	if (rc < 0)
	395	return rc;
	396
	397	vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
	398	vcpu->arch.sie_block->gpsw.mask \|= (rc & 3ul) << 44;
	399	return 0;
	400	}