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

/*
 * sigp.c - handlinge interprocessor communication
 *
 * Copyright IBM Corp. 2008
 *
 * 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>
 */

#include <linux/kvm.h>
#include <linux/kvm_host.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 __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int store)
{
	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_SIGP_STOP;

	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_STOP_INT, li->cpuflags);
	if (store)
		li->action_bits |= ACTION_STORE_ON_STOP;
	li->action_bits |= ACTION_STOP_ON_STOP;
	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 stop to cpu %x", cpu_addr);
	return rc;
}

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 = -ENOTSUPP;
	}
	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_guest(vcpu, &tmp,
		(u64) (address + vcpu->kvm->arch.guest_origin) , 1)) ||
	   (copy_from_guest(vcpu, &tmp, (u64) (address +
			vcpu->kvm->arch.guest_origin + 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, 0);
		break;
	case SIGP_STOP_STORE_STATUS:
		vcpu->stat.instruction_sigp_stop++;
		rc = __sigp_stop(vcpu, cpu_addr, 1);
		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 -ENOTSUPP;
	}

	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	*
	4	* Copyright IBM Corp. 2008
	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>
	12	*/
	13
	14	#include <linux/kvm.h>
	15	#include <linux/kvm_host.h>
	16	#include "gaccess.h"
	17	#include "kvm-s390.h"
	18
	19	/* sigp order codes */
	20	#define SIGP_SENSE 0x01
	21	#define SIGP_EXTERNAL_CALL 0x02
	22	#define SIGP_EMERGENCY 0x03
	23	#define SIGP_START 0x04
	24	#define SIGP_STOP 0x05
	25	#define SIGP_RESTART 0x06
	26	#define SIGP_STOP_STORE_STATUS 0x09
	27	#define SIGP_INITIAL_CPU_RESET 0x0b
	28	#define SIGP_CPU_RESET 0x0c
	29	#define SIGP_SET_PREFIX 0x0d
	30	#define SIGP_STORE_STATUS_ADDR 0x0e
	31	#define SIGP_SET_ARCH 0x12
	32
	33	/* cpu status bits */
	34	#define SIGP_STAT_EQUIPMENT_CHECK 0x80000000UL
	35	#define SIGP_STAT_INCORRECT_STATE 0x00000200UL
	36	#define SIGP_STAT_INVALID_PARAMETER 0x00000100UL
	37	#define SIGP_STAT_EXT_CALL_PENDING 0x00000080UL
	38	#define SIGP_STAT_STOPPED 0x00000040UL
	39	#define SIGP_STAT_OPERATOR_INTERV 0x00000020UL
	40	#define SIGP_STAT_CHECK_STOP 0x00000010UL
	41	#define SIGP_STAT_INOPERATIVE 0x00000004UL
	42	#define SIGP_STAT_INVALID_ORDER 0x00000002UL
	43	#define SIGP_STAT_RECEIVER_CHECK 0x00000001UL
	44
	45
0096369d MS	46	static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr,
0096369d MS	47	unsigned long *reg)
5288fbf0	48	{
180c12fb	49	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
5288fbf0 CB	50	int rc;
	51
	52	if (cpu_addr >= KVM_MAX_VCPUS)
	53	return 3; /* not operational */
	54
b037a4f3	55	spin_lock(&fi->lock);
5288fbf0 CB	56	if (fi->local_int[cpu_addr] == NULL)
	57	rc = 3; /* not operational */
	58	else if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
	59	& CPUSTAT_RUNNING) {
	60	*reg &= 0xffffffff00000000UL;
	61	rc = 1; /* status stored */
	62	} else {
	63	*reg &= 0xffffffff00000000UL;
	64	*reg \|= SIGP_STAT_STOPPED;
	65	rc = 1; /* status stored */
	66	}
b037a4f3	67	spin_unlock(&fi->lock);
5288fbf0 CB	68
	69	VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc);
	70	return rc;
	71	}
	72
	73	static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
	74	{
180c12fb CB	75	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	76	struct kvm_s390_local_interrupt *li;
	77	struct kvm_s390_interrupt_info *inti;
5288fbf0 CB	78	int rc;
	79
	80	if (cpu_addr >= KVM_MAX_VCPUS)
	81	return 3; /* not operational */
	82
	83	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	84	if (!inti)
	85	return -ENOMEM;
	86
	87	inti->type = KVM_S390_INT_EMERGENCY;
	88
b037a4f3	89	spin_lock(&fi->lock);
5288fbf0 CB	90	li = fi->local_int[cpu_addr];
	91	if (li == NULL) {
	92	rc = 3; /* not operational */
	93	kfree(inti);
	94	goto unlock;
	95	}
	96	spin_lock_bh(&li->lock);
	97	list_add_tail(&inti->list, &li->list);
	98	atomic_set(&li->active, 1);
	99	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	100	if (waitqueue_active(&li->wq))
	101	wake_up_interruptible(&li->wq);
	102	spin_unlock_bh(&li->lock);
	103	rc = 0; /* order accepted */
	104	unlock:
b037a4f3	105	spin_unlock(&fi->lock);
5288fbf0 CB	106	VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
	107	return rc;
	108	}
	109
	110	static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int store)
	111	{
180c12fb CB	112	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	113	struct kvm_s390_local_interrupt *li;
	114	struct kvm_s390_interrupt_info *inti;
5288fbf0 CB	115	int rc;
	116
	117	if (cpu_addr >= KVM_MAX_VCPUS)
	118	return 3; /* not operational */
	119
	120	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	121	if (!inti)
	122	return -ENOMEM;
	123
	124	inti->type = KVM_S390_SIGP_STOP;
	125
b037a4f3	126	spin_lock(&fi->lock);
5288fbf0 CB	127	li = fi->local_int[cpu_addr];
	128	if (li == NULL) {
	129	rc = 3; /* not operational */
	130	kfree(inti);
	131	goto unlock;
	132	}
	133	spin_lock_bh(&li->lock);
	134	list_add_tail(&inti->list, &li->list);
	135	atomic_set(&li->active, 1);
	136	atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
	137	if (store)
	138	li->action_bits \|= ACTION_STORE_ON_STOP;
	139	li->action_bits \|= ACTION_STOP_ON_STOP;
	140	if (waitqueue_active(&li->wq))
	141	wake_up_interruptible(&li->wq);
	142	spin_unlock_bh(&li->lock);
	143	rc = 0; /* order accepted */
	144	unlock:
b037a4f3	145	spin_unlock(&fi->lock);
5288fbf0 CB	146	VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
	147	return rc;
	148	}
	149
	150	static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
	151	{
	152	int rc;
	153
	154	switch (parameter & 0xff) {
	155	case 0:
5288fbf0 CB	156	rc = 3; /* not operational */
	157	break;
	158	case 1:
	159	case 2:
	160	rc = 0; /* order accepted */
	161	break;
	162	default:
	163	rc = -ENOTSUPP;
	164	}
	165	return rc;
	166	}
	167
	168	static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
0096369d	169	unsigned long *reg)
5288fbf0	170	{
180c12fb	171	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
53cb780a	172	struct kvm_s390_local_interrupt *li = NULL;
180c12fb	173	struct kvm_s390_interrupt_info *inti;
5288fbf0 CB	174	int rc;
	175	u8 tmp;
	176
	177	/* make sure that the new value is valid memory */
	178	address = address & 0x7fffe000u;
	179	if ((copy_from_guest(vcpu, &tmp,
	180	(u64) (address + vcpu->kvm->arch.guest_origin) , 1)) \|\|
	181	(copy_from_guest(vcpu, &tmp, (u64) (address +
	182	vcpu->kvm->arch.guest_origin + PAGE_SIZE), 1))) {
	183	*reg \|= SIGP_STAT_INVALID_PARAMETER;
	184	return 1; /* invalid parameter */
	185	}
	186
	187	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	188	if (!inti)
	189	return 2; /* busy */
	190
b037a4f3	191	spin_lock(&fi->lock);
53cb780a RK	192	if (cpu_addr < KVM_MAX_VCPUS)
53cb780a RK	193	li = fi->local_int[cpu_addr];
5288fbf0	194
53cb780a	195	if (li == NULL) {
5288fbf0 CB	196	rc = 1; /* incorrect state */
	197	*reg &= SIGP_STAT_INCORRECT_STATE;
	198	kfree(inti);
	199	goto out_fi;
	200	}
	201
	202	spin_lock_bh(&li->lock);
	203	/* cpu must be in stopped state */
	204	if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
	205	rc = 1; /* incorrect state */
	206	*reg &= SIGP_STAT_INCORRECT_STATE;
	207	kfree(inti);
	208	goto out_li;
	209	}
	210
	211	inti->type = KVM_S390_SIGP_SET_PREFIX;
	212	inti->prefix.address = address;
	213
	214	list_add_tail(&inti->list, &li->list);
	215	atomic_set(&li->active, 1);
	216	if (waitqueue_active(&li->wq))
	217	wake_up_interruptible(&li->wq);
	218	rc = 0; /* order accepted */
	219
	220	VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
	221	out_li:
	222	spin_unlock_bh(&li->lock);
	223	out_fi:
b037a4f3	224	spin_unlock(&fi->lock);
5288fbf0 CB	225	return rc;
	226	}
	227
	228	int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
	229	{
	230	int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
	231	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
	232	int base2 = vcpu->arch.sie_block->ipb >> 28;
	233	int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
	234	u32 parameter;
	235	u16 cpu_addr = vcpu->arch.guest_gprs[r3];
	236	u8 order_code;
	237	int rc;
	238
3eb77d51 CB	239	/* sigp in userspace can exit */
	240	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
	241	return kvm_s390_inject_program_int(vcpu,
	242	PGM_PRIVILEGED_OPERATION);
	243
5288fbf0 CB	244	order_code = disp2;
	245	if (base2)
	246	order_code += vcpu->arch.guest_gprs[base2];
	247
	248	if (r1 % 2)
	249	parameter = vcpu->arch.guest_gprs[r1];
	250	else
	251	parameter = vcpu->arch.guest_gprs[r1 + 1];
	252
	253	switch (order_code) {
	254	case SIGP_SENSE:
	255	vcpu->stat.instruction_sigp_sense++;
	256	rc = __sigp_sense(vcpu, cpu_addr,
	257	&vcpu->arch.guest_gprs[r1]);
	258	break;
	259	case SIGP_EMERGENCY:
	260	vcpu->stat.instruction_sigp_emergency++;
	261	rc = __sigp_emergency(vcpu, cpu_addr);
	262	break;
	263	case SIGP_STOP:
	264	vcpu->stat.instruction_sigp_stop++;
	265	rc = __sigp_stop(vcpu, cpu_addr, 0);
	266	break;
	267	case SIGP_STOP_STORE_STATUS:
	268	vcpu->stat.instruction_sigp_stop++;
	269	rc = __sigp_stop(vcpu, cpu_addr, 1);
	270	break;
	271	case SIGP_SET_ARCH:
	272	vcpu->stat.instruction_sigp_arch++;
	273	rc = __sigp_set_arch(vcpu, parameter);
	274	break;
	275	case SIGP_SET_PREFIX:
	276	vcpu->stat.instruction_sigp_prefix++;
	277	rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
	278	&vcpu->arch.guest_gprs[r1]);
	279	break;
	280	case SIGP_RESTART:
	281	vcpu->stat.instruction_sigp_restart++;
	282	/* user space must know about restart */
	283	default:
	284	return -ENOTSUPP;
	285	}
	286
	287	if (rc < 0)
	288	return rc;
	289
	290	vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
	291	vcpu->arch.sie_block->gpsw.mask \|= (rc & 3ul) << 44;
	292	return 0;
	293	}