[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;
	int rc = SIGP_CC_ORDER_CODE_ACCEPTED;

	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);
		if ((action & ACTION_STORE_ON_STOP) != 0)
			rc = -ESHUTDOWN;
		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 rc;
}

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);

	if ((action & ACTION_STORE_ON_STOP) != 0 && rc == -ESHUTDOWN) {
		/* If the CPU has already been stopped, we still have
		 * to save the status when doing stop-and-store. This
		 * has to be done after unlocking all spinlocks. */
		struct kvm_vcpu *dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
		rc = kvm_s390_store_status_unloaded(dst_vcpu,
						KVM_S390_STORE_STATUS_NOADDR);
	}

	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_OP);

	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);
d0321a24 CB	82	if (waitqueue_active(li->wq))
d0321a24 CB	83	wake_up_interruptible(li->wq);
5288fbf0	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);
d0321a24 CB	120	if (waitqueue_active(li->wq))
d0321a24 CB	121	wake_up_interruptible(li->wq);
7697e71f	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;
e879892c	133	int rc = SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0	134
9940fa80	135	inti = kzalloc(sizeof(*inti), GFP_ATOMIC);
5288fbf0 CB	136	if (!inti)
5288fbf0 CB	137	return -ENOMEM;
5288fbf0 CB	138	inti->type = KVM_S390_SIGP_STOP;
5288fbf0 CB	139
5288fbf0	140	spin_lock_bh(&li->lock);
a046b816 CD	141	if ((atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
a046b816 CD	142	kfree(inti);
e879892c TH	143	if ((action & ACTION_STORE_ON_STOP) != 0)
e879892c TH	144	rc = -ESHUTDOWN;
24a13044	145	goto out;
a046b816	146	}
5288fbf0 CB	147	list_add_tail(&inti->list, &li->list);
	148	atomic_set(&li->active, 1);
	149	atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
9ace903d	150	li->action_bits \|= action;
d0321a24 CB	151	if (waitqueue_active(li->wq))
d0321a24 CB	152	wake_up_interruptible(li->wq);
24a13044	153	out:
5288fbf0	154	spin_unlock_bh(&li->lock);
9ace903d	155
e879892c	156	return rc;
9ace903d CE	157	}
	158
	159	static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action)
	160	{
	161	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	162	struct kvm_s390_local_interrupt *li;
	163	int rc;
	164
	165	if (cpu_addr >= KVM_MAX_VCPUS)
ea1918dd	166	return SIGP_CC_NOT_OPERATIONAL;
9ace903d CE	167
	168	spin_lock(&fi->lock);
	169	li = fi->local_int[cpu_addr];
	170	if (li == NULL) {
ea1918dd	171	rc = SIGP_CC_NOT_OPERATIONAL;
9ace903d CE	172	goto unlock;
	173	}
	174
	175	rc = __inject_sigp_stop(li, action);
	176
5288fbf0	177	unlock:
b037a4f3	178	spin_unlock(&fi->lock);
5288fbf0	179	VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
e879892c TH	180
	181	if ((action & ACTION_STORE_ON_STOP) != 0 && rc == -ESHUTDOWN) {
	182	/* If the CPU has already been stopped, we still have
	183	* to save the status when doing stop-and-store. This
	184	* has to be done after unlocking all spinlocks. */
	185	struct kvm_vcpu *dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	186	rc = kvm_s390_store_status_unloaded(dst_vcpu,
	187	KVM_S390_STORE_STATUS_NOADDR);
	188	}
	189
5288fbf0 CB	190	return rc;
	191	}
	192
9ace903d CE	193	int kvm_s390_inject_sigp_stop(struct kvm_vcpu *vcpu, int action)
	194	{
	195	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	196	return __inject_sigp_stop(li, action);
	197	}
	198
5288fbf0 CB	199	static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
	200	{
	201	int rc;
	202
	203	switch (parameter & 0xff) {
	204	case 0:
ea1918dd	205	rc = SIGP_CC_NOT_OPERATIONAL;
5288fbf0 CB	206	break;
	207	case 1:
	208	case 2:
ea1918dd	209	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0 CB	210	break;
5288fbf0 CB	211	default:
b8e660b8	212	rc = -EOPNOTSUPP;
5288fbf0 CB	213	}
	214	return rc;
	215	}
	216
	217	static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
5a32c1af	218	u64 *reg)
5288fbf0	219	{
180c12fb	220	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
53cb780a	221	struct kvm_s390_local_interrupt *li = NULL;
180c12fb	222	struct kvm_s390_interrupt_info *inti;
5288fbf0 CB	223	int rc;
	224	u8 tmp;
	225
	226	/* make sure that the new value is valid memory */
	227	address = address & 0x7fffe000u;
092670cd CO	228	if (copy_from_guest_absolute(vcpu, &tmp, address, 1) \|\|
092670cd CO	229	copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)) {
0744426e	230	*reg &= 0xffffffff00000000UL;
a9ae32c3	231	*reg \|= SIGP_STATUS_INVALID_PARAMETER;
ea1918dd	232	return SIGP_CC_STATUS_STORED;
5288fbf0 CB	233	}
	234
	235	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	236	if (!inti)
ea1918dd	237	return SIGP_CC_BUSY;
5288fbf0	238
b037a4f3	239	spin_lock(&fi->lock);
53cb780a RK	240	if (cpu_addr < KVM_MAX_VCPUS)
53cb780a RK	241	li = fi->local_int[cpu_addr];
5288fbf0	242
53cb780a	243	if (li == NULL) {
0744426e HC	244	*reg &= 0xffffffff00000000UL;
0744426e HC	245	*reg \|= SIGP_STATUS_INCORRECT_STATE;
ea1918dd	246	rc = SIGP_CC_STATUS_STORED;
5288fbf0 CB	247	kfree(inti);
	248	goto out_fi;
	249	}
	250
	251	spin_lock_bh(&li->lock);
	252	/* cpu must be in stopped state */
9e6dabef	253	if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
0744426e HC	254	*reg &= 0xffffffff00000000UL;
0744426e HC	255	*reg \|= SIGP_STATUS_INCORRECT_STATE;
ea1918dd	256	rc = SIGP_CC_STATUS_STORED;
5288fbf0 CB	257	kfree(inti);
	258	goto out_li;
	259	}
	260
	261	inti->type = KVM_S390_SIGP_SET_PREFIX;
	262	inti->prefix.address = address;
	263
	264	list_add_tail(&inti->list, &li->list);
	265	atomic_set(&li->active, 1);
d0321a24 CB	266	if (waitqueue_active(li->wq))
d0321a24 CB	267	wake_up_interruptible(li->wq);
ea1918dd	268	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0 CB	269
	270	VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
	271	out_li:
	272	spin_unlock_bh(&li->lock);
	273	out_fi:
b037a4f3	274	spin_unlock(&fi->lock);
5288fbf0 CB	275	return rc;
	276	}
	277
bd59d3a4	278	static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr,
5a32c1af	279	u64 *reg)
bd59d3a4 CH	280	{
	281	int rc;
	282	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	283
	284	if (cpu_addr >= KVM_MAX_VCPUS)
ea1918dd	285	return SIGP_CC_NOT_OPERATIONAL;
bd59d3a4 CH	286
	287	spin_lock(&fi->lock);
	288	if (fi->local_int[cpu_addr] == NULL)
ea1918dd	289	rc = SIGP_CC_NOT_OPERATIONAL;
bd59d3a4 CH	290	else {
	291	if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
	292	& CPUSTAT_RUNNING) {
	293	/* running */
ea1918dd	294	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
bd59d3a4 CH	295	} else {
	296	/* not running */
	297	*reg &= 0xffffffff00000000UL;
a9ae32c3	298	*reg \|= SIGP_STATUS_NOT_RUNNING;
ea1918dd	299	rc = SIGP_CC_STATUS_STORED;
bd59d3a4 CH	300	}
	301	}
	302	spin_unlock(&fi->lock);
	303
	304	VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x", cpu_addr,
	305	rc);
	306
	307	return rc;
	308	}
	309
151104a7 JF	310	static int __sigp_restart(struct kvm_vcpu *vcpu, u16 cpu_addr)
151104a7 JF	311	{
151104a7 JF	312	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
151104a7 JF	313	struct kvm_s390_local_interrupt *li;
ea1918dd	314	int rc = SIGP_CC_ORDER_CODE_ACCEPTED;
151104a7 JF	315
151104a7 JF	316	if (cpu_addr >= KVM_MAX_VCPUS)
ea1918dd	317	return SIGP_CC_NOT_OPERATIONAL;
151104a7 JF	318
	319	spin_lock(&fi->lock);
	320	li = fi->local_int[cpu_addr];
	321	if (li == NULL) {
ea1918dd	322	rc = SIGP_CC_NOT_OPERATIONAL;
151104a7 JF	323	goto out;
	324	}
	325
	326	spin_lock_bh(&li->lock);
	327	if (li->action_bits & ACTION_STOP_ON_STOP)
ea1918dd	328	rc = SIGP_CC_BUSY;
151104a7 JF	329	else
	330	VCPU_EVENT(vcpu, 4, "sigp restart %x to handle userspace",
	331	cpu_addr);
	332	spin_unlock_bh(&li->lock);
	333	out:
	334	spin_unlock(&fi->lock);
	335	return rc;
	336	}
	337
5288fbf0 CB	338	int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
	339	{
	340	int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
	341	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
5288fbf0	342	u32 parameter;
5a32c1af	343	u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
5288fbf0 CB	344	u8 order_code;
	345	int rc;
	346
3eb77d51 CB	347	/* sigp in userspace can exit */
3eb77d51 CB	348	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
208dd756	349	return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
3eb77d51	350
b1c571a5	351	order_code = kvm_s390_get_base_disp_rs(vcpu);
5288fbf0 CB	352
5288fbf0 CB	353	if (r1 % 2)
5a32c1af	354	parameter = vcpu->run->s.regs.gprs[r1];
5288fbf0	355	else
5a32c1af	356	parameter = vcpu->run->s.regs.gprs[r1 + 1];
5288fbf0	357
5786fffa	358	trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter);
5288fbf0 CB	359	switch (order_code) {
	360	case SIGP_SENSE:
	361	vcpu->stat.instruction_sigp_sense++;
	362	rc = __sigp_sense(vcpu, cpu_addr,
5a32c1af	363	&vcpu->run->s.regs.gprs[r1]);
5288fbf0	364	break;
7697e71f CE	365	case SIGP_EXTERNAL_CALL:
	366	vcpu->stat.instruction_sigp_external_call++;
	367	rc = __sigp_external_call(vcpu, cpu_addr);
	368	break;
a9ae32c3	369	case SIGP_EMERGENCY_SIGNAL:
5288fbf0 CB	370	vcpu->stat.instruction_sigp_emergency++;
	371	rc = __sigp_emergency(vcpu, cpu_addr);
	372	break;
	373	case SIGP_STOP:
	374	vcpu->stat.instruction_sigp_stop++;
9ace903d	375	rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP);
5288fbf0	376	break;
a9ae32c3	377	case SIGP_STOP_AND_STORE_STATUS:
5288fbf0	378	vcpu->stat.instruction_sigp_stop++;
9ec2d6dc JF	379	rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP \|
9ec2d6dc JF	380	ACTION_STOP_ON_STOP);
5288fbf0	381	break;
a9ae32c3	382	case SIGP_SET_ARCHITECTURE:
5288fbf0 CB	383	vcpu->stat.instruction_sigp_arch++;
	384	rc = __sigp_set_arch(vcpu, parameter);
	385	break;
	386	case SIGP_SET_PREFIX:
	387	vcpu->stat.instruction_sigp_prefix++;
	388	rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
5a32c1af	389	&vcpu->run->s.regs.gprs[r1]);
5288fbf0	390	break;
bd59d3a4 CH	391	case SIGP_SENSE_RUNNING:
	392	vcpu->stat.instruction_sigp_sense_running++;
	393	rc = __sigp_sense_running(vcpu, cpu_addr,
5a32c1af	394	&vcpu->run->s.regs.gprs[r1]);
bd59d3a4	395	break;
5288fbf0 CB	396	case SIGP_RESTART:
5288fbf0 CB	397	vcpu->stat.instruction_sigp_restart++;
151104a7	398	rc = __sigp_restart(vcpu, cpu_addr);
ea1918dd	399	if (rc == SIGP_CC_BUSY)
151104a7	400	break;
5288fbf0 CB	401	/* user space must know about restart */
5288fbf0 CB	402	default:
b8e660b8	403	return -EOPNOTSUPP;
5288fbf0 CB	404	}
	405
	406	if (rc < 0)
	407	return rc;
	408
	409	vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
	410	vcpu->arch.sie_block->gpsw.mask \|= (rc & 3ul) << 44;
	411	return 0;
	412	}