[linux-block.git] / arch / s390 / kvm / sigp.c

/*
 * handling interprocessor communication
 *
 * Copyright IBM Corp. 2008, 2013
 *
 * 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_conditional_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr,
					u16 asn, u64 *reg)
{
	struct kvm_vcpu *dst_vcpu = NULL;
	const u64 psw_int_mask = PSW_MASK_IO | PSW_MASK_EXT;
	u16 p_asn, s_asn;
	psw_t *psw;
	u32 flags;

	if (cpu_addr < KVM_MAX_VCPUS)
		dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	if (!dst_vcpu)
		return SIGP_CC_NOT_OPERATIONAL;
	flags = atomic_read(&dst_vcpu->arch.sie_block->cpuflags);
	psw = &dst_vcpu->arch.sie_block->gpsw;
	p_asn = dst_vcpu->arch.sie_block->gcr[4] & 0xffff;  /* Primary ASN */
	s_asn = dst_vcpu->arch.sie_block->gcr[3] & 0xffff;  /* Secondary ASN */

	/* Deliver the emergency signal? */
	if (!(flags & CPUSTAT_STOPPED)
	    || (psw->mask & psw_int_mask) != psw_int_mask
	    || ((flags & CPUSTAT_WAIT) && psw->addr != 0)
	    || (!(flags & CPUSTAT_WAIT) && (asn == p_asn || asn == s_asn))) {
		return __sigp_emergency(vcpu, cpu_addr);
	} else {
		*reg &= 0xffffffff00000000UL;
		*reg |= SIGP_STATUS_INCORRECT_STATE;
		return SIGP_CC_STATUS_STORED;
	}
}

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;
}

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_store_status_at_addr(struct kvm_vcpu *vcpu, u16 cpu_id,
					u32 addr, u64 *reg)
{
	struct kvm_vcpu *dst_vcpu = NULL;
	int flags;
	int rc;

	if (cpu_id < KVM_MAX_VCPUS)
		dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_id);
	if (!dst_vcpu)
		return SIGP_CC_NOT_OPERATIONAL;

	spin_lock_bh(&dst_vcpu->arch.local_int.lock);
	flags = atomic_read(dst_vcpu->arch.local_int.cpuflags);
	spin_unlock_bh(&dst_vcpu->arch.local_int.lock);
	if (!(flags & CPUSTAT_STOPPED)) {
		*reg &= 0xffffffff00000000UL;
		*reg |= SIGP_STATUS_INCORRECT_STATE;
		return SIGP_CC_STATUS_STORED;
	}

	addr &= 0x7ffffe00;
	rc = kvm_s390_store_status_unloaded(dst_vcpu, addr);
	if (rc == -EFAULT) {
		*reg &= 0xffffffff00000000UL;
		*reg |= SIGP_STATUS_INVALID_PARAMETER;
		rc = SIGP_CC_STATUS_STORED;
	}
	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;
}

/* Test whether the destination CPU is available and not busy */
static int sigp_check_callable(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;
	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_STORE_STATUS_AT_ADDRESS:
		rc = __sigp_store_status_at_addr(vcpu, cpu_addr, parameter,
						 &vcpu->run->s.regs.gprs[r1]);
		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_COND_EMERGENCY_SIGNAL:
		rc = __sigp_conditional_emergency(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_START:
		rc = sigp_check_callable(vcpu, cpu_addr);
		if (rc == SIGP_CC_ORDER_CODE_ACCEPTED)
			rc = -EOPNOTSUPP;    /* Handle START in user space */
		break;
	case SIGP_RESTART:
		vcpu->stat.instruction_sigp_restart++;
		rc = sigp_check_callable(vcpu, cpu_addr);
		if (rc == SIGP_CC_ORDER_CODE_ACCEPTED) {
			VCPU_EVENT(vcpu, 4,
				   "sigp restart %x to handle userspace",
				   cpu_addr);
			/* user space must know about restart */
			rc = -EOPNOTSUPP;
		}
		break;
	default:
		return -EOPNOTSUPP;
	}

	if (rc < 0)
		return rc;

	kvm_s390_set_psw_cc(vcpu, rc);
	return 0;
}
Commit	Line	Data
5288fbf0	1	/*
a53c8fab	2	* handling interprocessor communication
5288fbf0	3	*
b13d3580	4	* Copyright IBM Corp. 2008, 2013
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
b13d3580 TH	92	static int __sigp_conditional_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr,
	93	u16 asn, u64 *reg)
	94	{
	95	struct kvm_vcpu *dst_vcpu = NULL;
	96	const u64 psw_int_mask = PSW_MASK_IO \| PSW_MASK_EXT;
	97	u16 p_asn, s_asn;
	98	psw_t *psw;
	99	u32 flags;
	100
	101	if (cpu_addr < KVM_MAX_VCPUS)
	102	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	103	if (!dst_vcpu)
	104	return SIGP_CC_NOT_OPERATIONAL;
	105	flags = atomic_read(&dst_vcpu->arch.sie_block->cpuflags);
	106	psw = &dst_vcpu->arch.sie_block->gpsw;
	107	p_asn = dst_vcpu->arch.sie_block->gcr[4] & 0xffff; /* Primary ASN */
	108	s_asn = dst_vcpu->arch.sie_block->gcr[3] & 0xffff; /* Secondary ASN */
	109
	110	/* Deliver the emergency signal? */
	111	if (!(flags & CPUSTAT_STOPPED)
	112	\|\| (psw->mask & psw_int_mask) != psw_int_mask
	113	\|\| ((flags & CPUSTAT_WAIT) && psw->addr != 0)
	114	\|\| (!(flags & CPUSTAT_WAIT) && (asn == p_asn \|\| asn == s_asn))) {
	115	return __sigp_emergency(vcpu, cpu_addr);
	116	} else {
	117	*reg &= 0xffffffff00000000UL;
	118	*reg \|= SIGP_STATUS_INCORRECT_STATE;
	119	return SIGP_CC_STATUS_STORED;
	120	}
	121	}
	122
7697e71f CE	123	static int __sigp_external_call(struct kvm_vcpu *vcpu, u16 cpu_addr)
	124	{
	125	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	126	struct kvm_s390_local_interrupt *li;
	127	struct kvm_s390_interrupt_info *inti;
	128	int rc;
	129
	130	if (cpu_addr >= KVM_MAX_VCPUS)
ea1918dd	131	return SIGP_CC_NOT_OPERATIONAL;
7697e71f CE	132
	133	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	134	if (!inti)
	135	return -ENOMEM;
	136
	137	inti->type = KVM_S390_INT_EXTERNAL_CALL;
	138	inti->extcall.code = vcpu->vcpu_id;
	139
	140	spin_lock(&fi->lock);
	141	li = fi->local_int[cpu_addr];
	142	if (li == NULL) {
ea1918dd	143	rc = SIGP_CC_NOT_OPERATIONAL;
7697e71f CE	144	kfree(inti);
	145	goto unlock;
	146	}
	147	spin_lock_bh(&li->lock);
	148	list_add_tail(&inti->list, &li->list);
	149	atomic_set(&li->active, 1);
	150	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
d0321a24 CB	151	if (waitqueue_active(li->wq))
d0321a24 CB	152	wake_up_interruptible(li->wq);
7697e71f	153	spin_unlock_bh(&li->lock);
ea1918dd	154	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
7697e71f	155	VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x", cpu_addr);
5288fbf0	156	unlock:
b037a4f3	157	spin_unlock(&fi->lock);
5288fbf0 CB	158	return rc;
	159	}
	160
9ace903d	161	static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action)
5288fbf0	162	{
180c12fb	163	struct kvm_s390_interrupt_info *inti;
e879892c	164	int rc = SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0	165
9940fa80	166	inti = kzalloc(sizeof(*inti), GFP_ATOMIC);
5288fbf0 CB	167	if (!inti)
5288fbf0 CB	168	return -ENOMEM;
5288fbf0 CB	169	inti->type = KVM_S390_SIGP_STOP;
5288fbf0 CB	170
5288fbf0	171	spin_lock_bh(&li->lock);
a046b816 CD	172	if ((atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
a046b816 CD	173	kfree(inti);
e879892c TH	174	if ((action & ACTION_STORE_ON_STOP) != 0)
e879892c TH	175	rc = -ESHUTDOWN;
24a13044	176	goto out;
a046b816	177	}
5288fbf0 CB	178	list_add_tail(&inti->list, &li->list);
	179	atomic_set(&li->active, 1);
	180	atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
9ace903d	181	li->action_bits \|= action;
d0321a24 CB	182	if (waitqueue_active(li->wq))
d0321a24 CB	183	wake_up_interruptible(li->wq);
24a13044	184	out:
5288fbf0	185	spin_unlock_bh(&li->lock);
9ace903d	186
e879892c	187	return rc;
9ace903d CE	188	}
	189
	190	static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action)
	191	{
	192	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	193	struct kvm_s390_local_interrupt *li;
	194	int rc;
	195
	196	if (cpu_addr >= KVM_MAX_VCPUS)
ea1918dd	197	return SIGP_CC_NOT_OPERATIONAL;
9ace903d CE	198
	199	spin_lock(&fi->lock);
	200	li = fi->local_int[cpu_addr];
	201	if (li == NULL) {
ea1918dd	202	rc = SIGP_CC_NOT_OPERATIONAL;
9ace903d CE	203	goto unlock;
	204	}
	205
	206	rc = __inject_sigp_stop(li, action);
	207
5288fbf0	208	unlock:
b037a4f3	209	spin_unlock(&fi->lock);
5288fbf0	210	VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
e879892c TH	211
	212	if ((action & ACTION_STORE_ON_STOP) != 0 && rc == -ESHUTDOWN) {
	213	/* If the CPU has already been stopped, we still have
	214	* to save the status when doing stop-and-store. This
	215	* has to be done after unlocking all spinlocks. */
	216	struct kvm_vcpu *dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	217	rc = kvm_s390_store_status_unloaded(dst_vcpu,
	218	KVM_S390_STORE_STATUS_NOADDR);
	219	}
	220
5288fbf0 CB	221	return rc;
	222	}
	223
	224	static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
	225	{
	226	int rc;
	227
	228	switch (parameter & 0xff) {
	229	case 0:
ea1918dd	230	rc = SIGP_CC_NOT_OPERATIONAL;
5288fbf0 CB	231	break;
	232	case 1:
	233	case 2:
ea1918dd	234	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0 CB	235	break;
5288fbf0 CB	236	default:
b8e660b8	237	rc = -EOPNOTSUPP;
5288fbf0 CB	238	}
	239	return rc;
	240	}
	241
	242	static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
5a32c1af	243	u64 *reg)
5288fbf0	244	{
180c12fb	245	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
53cb780a	246	struct kvm_s390_local_interrupt *li = NULL;
180c12fb	247	struct kvm_s390_interrupt_info *inti;
5288fbf0 CB	248	int rc;
	249	u8 tmp;
	250
	251	/* make sure that the new value is valid memory */
	252	address = address & 0x7fffe000u;
092670cd CO	253	if (copy_from_guest_absolute(vcpu, &tmp, address, 1) \|\|
092670cd CO	254	copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)) {
0744426e	255	*reg &= 0xffffffff00000000UL;
a9ae32c3	256	*reg \|= SIGP_STATUS_INVALID_PARAMETER;
ea1918dd	257	return SIGP_CC_STATUS_STORED;
5288fbf0 CB	258	}
	259
	260	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	261	if (!inti)
ea1918dd	262	return SIGP_CC_BUSY;
5288fbf0	263
b037a4f3	264	spin_lock(&fi->lock);
53cb780a RK	265	if (cpu_addr < KVM_MAX_VCPUS)
53cb780a RK	266	li = fi->local_int[cpu_addr];
5288fbf0	267
53cb780a	268	if (li == NULL) {
0744426e HC	269	*reg &= 0xffffffff00000000UL;
0744426e HC	270	*reg \|= SIGP_STATUS_INCORRECT_STATE;
ea1918dd	271	rc = SIGP_CC_STATUS_STORED;
5288fbf0 CB	272	kfree(inti);
	273	goto out_fi;
	274	}
	275
	276	spin_lock_bh(&li->lock);
	277	/* cpu must be in stopped state */
9e6dabef	278	if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
0744426e HC	279	*reg &= 0xffffffff00000000UL;
0744426e HC	280	*reg \|= SIGP_STATUS_INCORRECT_STATE;
ea1918dd	281	rc = SIGP_CC_STATUS_STORED;
5288fbf0 CB	282	kfree(inti);
	283	goto out_li;
	284	}
	285
	286	inti->type = KVM_S390_SIGP_SET_PREFIX;
	287	inti->prefix.address = address;
	288
	289	list_add_tail(&inti->list, &li->list);
	290	atomic_set(&li->active, 1);
d0321a24 CB	291	if (waitqueue_active(li->wq))
d0321a24 CB	292	wake_up_interruptible(li->wq);
ea1918dd	293	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0 CB	294
	295	VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
	296	out_li:
	297	spin_unlock_bh(&li->lock);
	298	out_fi:
b037a4f3	299	spin_unlock(&fi->lock);
5288fbf0 CB	300	return rc;
	301	}
	302
00e9e435 TH	303	static int __sigp_store_status_at_addr(struct kvm_vcpu *vcpu, u16 cpu_id,
	304	u32 addr, u64 *reg)
	305	{
	306	struct kvm_vcpu *dst_vcpu = NULL;
	307	int flags;
	308	int rc;
	309
	310	if (cpu_id < KVM_MAX_VCPUS)
	311	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_id);
	312	if (!dst_vcpu)
	313	return SIGP_CC_NOT_OPERATIONAL;
	314
	315	spin_lock_bh(&dst_vcpu->arch.local_int.lock);
	316	flags = atomic_read(dst_vcpu->arch.local_int.cpuflags);
	317	spin_unlock_bh(&dst_vcpu->arch.local_int.lock);
	318	if (!(flags & CPUSTAT_STOPPED)) {
	319	*reg &= 0xffffffff00000000UL;
	320	*reg \|= SIGP_STATUS_INCORRECT_STATE;
	321	return SIGP_CC_STATUS_STORED;
	322	}
	323
	324	addr &= 0x7ffffe00;
	325	rc = kvm_s390_store_status_unloaded(dst_vcpu, addr);
	326	if (rc == -EFAULT) {
	327	*reg &= 0xffffffff00000000UL;
	328	*reg \|= SIGP_STATUS_INVALID_PARAMETER;
	329	rc = SIGP_CC_STATUS_STORED;
	330	}
	331	return rc;
	332	}
	333
bd59d3a4	334	static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr,
5a32c1af	335	u64 *reg)
bd59d3a4 CH	336	{
	337	int rc;
	338	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
	339
	340	if (cpu_addr >= KVM_MAX_VCPUS)
ea1918dd	341	return SIGP_CC_NOT_OPERATIONAL;
bd59d3a4 CH	342
	343	spin_lock(&fi->lock);
	344	if (fi->local_int[cpu_addr] == NULL)
ea1918dd	345	rc = SIGP_CC_NOT_OPERATIONAL;
bd59d3a4 CH	346	else {
	347	if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
	348	& CPUSTAT_RUNNING) {
	349	/* running */
ea1918dd	350	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
bd59d3a4 CH	351	} else {
	352	/* not running */
	353	*reg &= 0xffffffff00000000UL;
a9ae32c3	354	*reg \|= SIGP_STATUS_NOT_RUNNING;
ea1918dd	355	rc = SIGP_CC_STATUS_STORED;
bd59d3a4 CH	356	}
	357	}
	358	spin_unlock(&fi->lock);
	359
	360	VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x", cpu_addr,
	361	rc);
	362
	363	return rc;
	364	}
	365
cc92d6de TH	366	/* Test whether the destination CPU is available and not busy */
cc92d6de TH	367	static int sigp_check_callable(struct kvm_vcpu *vcpu, u16 cpu_addr)
151104a7	368	{
151104a7 JF	369	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
151104a7 JF	370	struct kvm_s390_local_interrupt *li;
ea1918dd	371	int rc = SIGP_CC_ORDER_CODE_ACCEPTED;
151104a7 JF	372
151104a7 JF	373	if (cpu_addr >= KVM_MAX_VCPUS)
ea1918dd	374	return SIGP_CC_NOT_OPERATIONAL;
151104a7 JF	375
	376	spin_lock(&fi->lock);
	377	li = fi->local_int[cpu_addr];
	378	if (li == NULL) {
ea1918dd	379	rc = SIGP_CC_NOT_OPERATIONAL;
151104a7 JF	380	goto out;
	381	}
	382
	383	spin_lock_bh(&li->lock);
	384	if (li->action_bits & ACTION_STOP_ON_STOP)
ea1918dd	385	rc = SIGP_CC_BUSY;
151104a7 JF	386	spin_unlock_bh(&li->lock);
	387	out:
	388	spin_unlock(&fi->lock);
	389	return rc;
	390	}
	391
5288fbf0 CB	392	int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
	393	{
	394	int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
	395	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
5288fbf0	396	u32 parameter;
5a32c1af	397	u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
5288fbf0 CB	398	u8 order_code;
	399	int rc;
	400
3eb77d51 CB	401	/* sigp in userspace can exit */
3eb77d51 CB	402	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
208dd756	403	return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
3eb77d51	404
b1c571a5	405	order_code = kvm_s390_get_base_disp_rs(vcpu);
5288fbf0 CB	406
5288fbf0 CB	407	if (r1 % 2)
5a32c1af	408	parameter = vcpu->run->s.regs.gprs[r1];
5288fbf0	409	else
5a32c1af	410	parameter = vcpu->run->s.regs.gprs[r1 + 1];
5288fbf0	411
5786fffa	412	trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter);
5288fbf0 CB	413	switch (order_code) {
	414	case SIGP_SENSE:
	415	vcpu->stat.instruction_sigp_sense++;
	416	rc = __sigp_sense(vcpu, cpu_addr,
5a32c1af	417	&vcpu->run->s.regs.gprs[r1]);
5288fbf0	418	break;
7697e71f CE	419	case SIGP_EXTERNAL_CALL:
	420	vcpu->stat.instruction_sigp_external_call++;
	421	rc = __sigp_external_call(vcpu, cpu_addr);
	422	break;
a9ae32c3	423	case SIGP_EMERGENCY_SIGNAL:
5288fbf0 CB	424	vcpu->stat.instruction_sigp_emergency++;
	425	rc = __sigp_emergency(vcpu, cpu_addr);
	426	break;
	427	case SIGP_STOP:
	428	vcpu->stat.instruction_sigp_stop++;
9ace903d	429	rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP);
5288fbf0	430	break;
a9ae32c3	431	case SIGP_STOP_AND_STORE_STATUS:
5288fbf0	432	vcpu->stat.instruction_sigp_stop++;
9ec2d6dc JF	433	rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP \|
9ec2d6dc JF	434	ACTION_STOP_ON_STOP);
5288fbf0	435	break;
00e9e435 TH	436	case SIGP_STORE_STATUS_AT_ADDRESS:
	437	rc = __sigp_store_status_at_addr(vcpu, cpu_addr, parameter,
	438	&vcpu->run->s.regs.gprs[r1]);
	439	break;
a9ae32c3	440	case SIGP_SET_ARCHITECTURE:
5288fbf0 CB	441	vcpu->stat.instruction_sigp_arch++;
	442	rc = __sigp_set_arch(vcpu, parameter);
	443	break;
	444	case SIGP_SET_PREFIX:
	445	vcpu->stat.instruction_sigp_prefix++;
	446	rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
5a32c1af	447	&vcpu->run->s.regs.gprs[r1]);
5288fbf0	448	break;
b13d3580 TH	449	case SIGP_COND_EMERGENCY_SIGNAL:
	450	rc = __sigp_conditional_emergency(vcpu, cpu_addr, parameter,
	451	&vcpu->run->s.regs.gprs[r1]);
	452	break;
bd59d3a4 CH	453	case SIGP_SENSE_RUNNING:
	454	vcpu->stat.instruction_sigp_sense_running++;
	455	rc = __sigp_sense_running(vcpu, cpu_addr,
5a32c1af	456	&vcpu->run->s.regs.gprs[r1]);
bd59d3a4	457	break;
58bc33b2 TH	458	case SIGP_START:
	459	rc = sigp_check_callable(vcpu, cpu_addr);
	460	if (rc == SIGP_CC_ORDER_CODE_ACCEPTED)
	461	rc = -EOPNOTSUPP; /* Handle START in user space */
	462	break;
5288fbf0 CB	463	case SIGP_RESTART:
5288fbf0 CB	464	vcpu->stat.instruction_sigp_restart++;
cc92d6de TH	465	rc = sigp_check_callable(vcpu, cpu_addr);
	466	if (rc == SIGP_CC_ORDER_CODE_ACCEPTED) {
	467	VCPU_EVENT(vcpu, 4,
	468	"sigp restart %x to handle userspace",
	469	cpu_addr);
	470	/* user space must know about restart */
	471	rc = -EOPNOTSUPP;
	472	}
	473	break;
5288fbf0	474	default:
b8e660b8	475	return -EOPNOTSUPP;
5288fbf0 CB	476	}
	477
	478	if (rc < 0)
	479	return rc;
	480
949c007a	481	kvm_s390_set_psw_cc(vcpu, rc);
5288fbf0 CB	482	return 0;
5288fbf0 CB	483	}