[deliverable/linux.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_local_interrupt *li;
	struct kvm_vcpu *dst_vcpu = NULL;
	int cpuflags;
	int rc;

	if (cpu_addr >= KVM_MAX_VCPUS)
		return SIGP_CC_NOT_OPERATIONAL;

	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	if (!dst_vcpu)
		return SIGP_CC_NOT_OPERATIONAL;
	li = &dst_vcpu->arch.local_int;

	cpuflags = atomic_read(li->cpuflags);
	if (!(cpuflags & (CPUSTAT_ECALL_PEND | CPUSTAT_STOPPED)))
		rc = SIGP_CC_ORDER_CODE_ACCEPTED;
	else {
		*reg &= 0xffffffff00000000UL;
		if (cpuflags & CPUSTAT_ECALL_PEND)
			*reg |= SIGP_STATUS_EXT_CALL_PENDING;
		if (cpuflags & CPUSTAT_STOPPED)
			*reg |= SIGP_STATUS_STOPPED;
		rc = SIGP_CC_STATUS_STORED;
	}

	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_interrupt s390int = {
		.type = KVM_S390_INT_EMERGENCY,
		.parm = vcpu->vcpu_id,
	};
	struct kvm_vcpu *dst_vcpu = NULL;
	int rc = 0;

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

	rc = kvm_s390_inject_vcpu(dst_vcpu, &s390int);
	if (!rc)
		VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);

	return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
}

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_interrupt s390int = {
		.type = KVM_S390_INT_EXTERNAL_CALL,
		.parm = vcpu->vcpu_id,
	};
	struct kvm_vcpu *dst_vcpu = NULL;
	int rc;

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

	rc = kvm_s390_inject_vcpu(dst_vcpu, &s390int);
	if (!rc)
		VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x", cpu_addr);

	return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
}

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(&li->lock);
	if (li->action_bits & ACTION_STOP_ON_STOP) {
		/* another SIGP STOP is pending */
		rc = SIGP_CC_BUSY;
		goto out;
	}
	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);
	li->action_bits |= action;
	atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
	if (waitqueue_active(li->wq))
		wake_up_interruptible(li->wq);
out:
	spin_unlock(&li->lock);

	return rc;
}

static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action)
{
	struct kvm_s390_local_interrupt *li;
	struct kvm_vcpu *dst_vcpu = NULL;
	int rc;

	if (cpu_addr >= KVM_MAX_VCPUS)
		return SIGP_CC_NOT_OPERATIONAL;

	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	if (!dst_vcpu)
		return SIGP_CC_NOT_OPERATIONAL;
	li = &dst_vcpu->arch.local_int;

	rc = __inject_sigp_stop(li, action);

	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. */
		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;
	unsigned int i;
	struct kvm_vcpu *v;

	switch (parameter & 0xff) {
	case 0:
		rc = SIGP_CC_NOT_OPERATIONAL;
		break;
	case 1:
	case 2:
		kvm_for_each_vcpu(i, v, vcpu->kvm) {
			v->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
			kvm_clear_async_pf_completion_queue(v);
		}

		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_local_interrupt *li;
	struct kvm_vcpu *dst_vcpu = NULL;
	struct kvm_s390_interrupt_info *inti;
	int rc;

	if (cpu_addr < KVM_MAX_VCPUS)
		dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	if (!dst_vcpu)
		return SIGP_CC_NOT_OPERATIONAL;
	li = &dst_vcpu->arch.local_int;

	/*
	 * Make sure the new value is valid memory. We only need to check the
	 * first page, since address is 8k aligned and memory pieces are always
	 * at least 1MB aligned and have at least a size of 1MB.
	 */
	address &= 0x7fffe000u;
	if (kvm_is_error_gpa(vcpu->kvm, address)) {
		*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(&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(&li->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(&dst_vcpu->arch.local_int.lock);
	flags = atomic_read(dst_vcpu->arch.local_int.cpuflags);
	spin_unlock(&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)
{
	struct kvm_s390_local_interrupt *li;
	struct kvm_vcpu *dst_vcpu = NULL;
	int rc;

	if (cpu_addr >= KVM_MAX_VCPUS)
		return SIGP_CC_NOT_OPERATIONAL;

	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	if (!dst_vcpu)
		return SIGP_CC_NOT_OPERATIONAL;
	li = &dst_vcpu->arch.local_int;
	if (atomic_read(li->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;
	}

	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_local_interrupt *li;
	int rc = SIGP_CC_ORDER_CODE_ACCEPTED;
	struct kvm_vcpu *dst_vcpu = NULL;

	if (cpu_addr >= KVM_MAX_VCPUS)
		return SIGP_CC_NOT_OPERATIONAL;

	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	if (!dst_vcpu)
		return SIGP_CC_NOT_OPERATIONAL;
	li = &dst_vcpu->arch.local_int;
	spin_lock(&li->lock);
	if (li->action_bits & ACTION_STOP_ON_STOP)
		rc = SIGP_CC_BUSY;
	spin_unlock(&li->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;
}

/*
 * Handle SIGP partial execution interception.
 *
 * This interception will occur at the source cpu when a source cpu sends an
 * external call to a target cpu and the target cpu has the WAIT bit set in
 * its cpuflags. Interception will occurr after the interrupt indicator bits at
 * the target cpu have been set. All error cases will lead to instruction
 * interception, therefore nothing is to be checked or prepared.
 */
int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu)
{
	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
	u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
	struct kvm_vcpu *dest_vcpu;
	u8 order_code = kvm_s390_get_base_disp_rs(vcpu);

	trace_kvm_s390_handle_sigp_pei(vcpu, order_code, cpu_addr);

	if (order_code == SIGP_EXTERNAL_CALL) {
		dest_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
		BUG_ON(dest_vcpu == NULL);

		spin_lock(&dest_vcpu->arch.local_int.lock);
		if (waitqueue_active(&dest_vcpu->wq))
			wake_up_interruptible(&dest_vcpu->wq);
		dest_vcpu->preempted = true;
		spin_unlock(&dest_vcpu->arch.local_int.lock);

		kvm_s390_set_psw_cc(vcpu, SIGP_CC_ORDER_CODE_ACCEPTED);
		return 0;
	}

	return -EOPNOTSUPP;
}
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	{
1ee0bc55 JF	26	struct kvm_s390_local_interrupt *li;
	27	struct kvm_vcpu *dst_vcpu = NULL;
	28	int cpuflags;
5288fbf0 CB	29	int rc;
	30
	31	if (cpu_addr >= KVM_MAX_VCPUS)
ea1918dd	32	return SIGP_CC_NOT_OPERATIONAL;
5288fbf0	33
1ee0bc55 JF	34	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	35	if (!dst_vcpu)
	36	return SIGP_CC_NOT_OPERATIONAL;
	37	li = &dst_vcpu->arch.local_int;
	38
	39	cpuflags = atomic_read(li->cpuflags);
	40	if (!(cpuflags & (CPUSTAT_ECALL_PEND \| CPUSTAT_STOPPED)))
21b26c08 CH	41	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
21b26c08 CH	42	else {
5288fbf0	43	*reg &= 0xffffffff00000000UL;
1ee0bc55	44	if (cpuflags & CPUSTAT_ECALL_PEND)
21b26c08	45	*reg \|= SIGP_STATUS_EXT_CALL_PENDING;
1ee0bc55	46	if (cpuflags & CPUSTAT_STOPPED)
21b26c08	47	*reg \|= SIGP_STATUS_STOPPED;
ea1918dd	48	rc = SIGP_CC_STATUS_STORED;
5288fbf0	49	}
5288fbf0 CB	50
	51	VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc);
	52	return rc;
	53	}
	54
	55	static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
	56	{
22ff4a33 JF	57	struct kvm_s390_interrupt s390int = {
	58	.type = KVM_S390_INT_EMERGENCY,
	59	.parm = vcpu->vcpu_id,
	60	};
1ee0bc55	61	struct kvm_vcpu *dst_vcpu = NULL;
22ff4a33	62	int rc = 0;
5288fbf0	63
91880d07 TH	64	if (cpu_addr < KVM_MAX_VCPUS)
	65	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	66	if (!dst_vcpu)
ea1918dd	67	return SIGP_CC_NOT_OPERATIONAL;
5288fbf0	68
22ff4a33 JF	69	rc = kvm_s390_inject_vcpu(dst_vcpu, &s390int);
	70	if (!rc)
	71	VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
5288fbf0	72
22ff4a33	73	return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
7697e71f CE	74	}
7697e71f CE	75
b13d3580 TH	76	static int __sigp_conditional_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr,
	77	u16 asn, u64 *reg)
	78	{
	79	struct kvm_vcpu *dst_vcpu = NULL;
	80	const u64 psw_int_mask = PSW_MASK_IO \| PSW_MASK_EXT;
	81	u16 p_asn, s_asn;
	82	psw_t *psw;
	83	u32 flags;
	84
	85	if (cpu_addr < KVM_MAX_VCPUS)
	86	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	87	if (!dst_vcpu)
	88	return SIGP_CC_NOT_OPERATIONAL;
	89	flags = atomic_read(&dst_vcpu->arch.sie_block->cpuflags);
	90	psw = &dst_vcpu->arch.sie_block->gpsw;
	91	p_asn = dst_vcpu->arch.sie_block->gcr[4] & 0xffff; /* Primary ASN */
	92	s_asn = dst_vcpu->arch.sie_block->gcr[3] & 0xffff; /* Secondary ASN */
	93
	94	/* Deliver the emergency signal? */
	95	if (!(flags & CPUSTAT_STOPPED)
	96	\|\| (psw->mask & psw_int_mask) != psw_int_mask
	97	\|\| ((flags & CPUSTAT_WAIT) && psw->addr != 0)
	98	\|\| (!(flags & CPUSTAT_WAIT) && (asn == p_asn \|\| asn == s_asn))) {
	99	return __sigp_emergency(vcpu, cpu_addr);
	100	} else {
	101	*reg &= 0xffffffff00000000UL;
	102	*reg \|= SIGP_STATUS_INCORRECT_STATE;
	103	return SIGP_CC_STATUS_STORED;
	104	}
	105	}
	106
7697e71f CE	107	static int __sigp_external_call(struct kvm_vcpu *vcpu, u16 cpu_addr)
7697e71f CE	108	{
22ff4a33 JF	109	struct kvm_s390_interrupt s390int = {
	110	.type = KVM_S390_INT_EXTERNAL_CALL,
	111	.parm = vcpu->vcpu_id,
	112	};
1ee0bc55	113	struct kvm_vcpu *dst_vcpu = NULL;
22ff4a33	114	int rc;
7697e71f	115
91880d07 TH	116	if (cpu_addr < KVM_MAX_VCPUS)
	117	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	118	if (!dst_vcpu)
ea1918dd	119	return SIGP_CC_NOT_OPERATIONAL;
7697e71f	120
22ff4a33 JF	121	rc = kvm_s390_inject_vcpu(dst_vcpu, &s390int);
	122	if (!rc)
	123	VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x", cpu_addr);
7697e71f	124
22ff4a33	125	return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0 CB	126	}
5288fbf0 CB	127
9ace903d	128	static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action)
5288fbf0	129	{
180c12fb	130	struct kvm_s390_interrupt_info *inti;
e879892c	131	int rc = SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0	132
9940fa80	133	inti = kzalloc(sizeof(*inti), GFP_ATOMIC);
5288fbf0 CB	134	if (!inti)
5288fbf0 CB	135	return -ENOMEM;
5288fbf0 CB	136	inti->type = KVM_S390_SIGP_STOP;
5288fbf0 CB	137
4ae3c081	138	spin_lock(&li->lock);
7dfc63cf DH	139	if (li->action_bits & ACTION_STOP_ON_STOP) {
	140	/* another SIGP STOP is pending */
	141	rc = SIGP_CC_BUSY;
	142	goto out;
	143	}
a046b816 CD	144	if ((atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
a046b816 CD	145	kfree(inti);
e879892c TH	146	if ((action & ACTION_STORE_ON_STOP) != 0)
e879892c TH	147	rc = -ESHUTDOWN;
24a13044	148	goto out;
a046b816	149	}
5288fbf0 CB	150	list_add_tail(&inti->list, &li->list);
5288fbf0 CB	151	atomic_set(&li->active, 1);
9ace903d	152	li->action_bits \|= action;
7dfc63cf	153	atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
d0321a24 CB	154	if (waitqueue_active(li->wq))
d0321a24 CB	155	wake_up_interruptible(li->wq);
24a13044	156	out:
4ae3c081	157	spin_unlock(&li->lock);
9ace903d	158
e879892c	159	return rc;
9ace903d CE	160	}
	161
	162	static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action)
	163	{
9ace903d	164	struct kvm_s390_local_interrupt *li;
1ee0bc55	165	struct kvm_vcpu *dst_vcpu = NULL;
9ace903d CE	166	int rc;
	167
	168	if (cpu_addr >= KVM_MAX_VCPUS)
ea1918dd	169	return SIGP_CC_NOT_OPERATIONAL;
9ace903d	170
1ee0bc55 JF	171	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	172	if (!dst_vcpu)
	173	return SIGP_CC_NOT_OPERATIONAL;
	174	li = &dst_vcpu->arch.local_int;
9ace903d CE	175
	176	rc = __inject_sigp_stop(li, action);
	177
5288fbf0	178	VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
e879892c TH	179
	180	if ((action & ACTION_STORE_ON_STOP) != 0 && rc == -ESHUTDOWN) {
	181	/* If the CPU has already been stopped, we still have
	182	* to save the status when doing stop-and-store. This
	183	* has to be done after unlocking all spinlocks. */
e879892c TH	184	rc = kvm_s390_store_status_unloaded(dst_vcpu,
	185	KVM_S390_STORE_STATUS_NOADDR);
	186	}
	187
5288fbf0 CB	188	return rc;
	189	}
	190
	191	static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
	192	{
	193	int rc;
3c038e6b DD	194	unsigned int i;
3c038e6b DD	195	struct kvm_vcpu *v;
5288fbf0 CB	196
	197	switch (parameter & 0xff) {
	198	case 0:
ea1918dd	199	rc = SIGP_CC_NOT_OPERATIONAL;
5288fbf0 CB	200	break;
	201	case 1:
	202	case 2:
3c038e6b DD	203	kvm_for_each_vcpu(i, v, vcpu->kvm) {
	204	v->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
	205	kvm_clear_async_pf_completion_queue(v);
	206	}
	207
ea1918dd	208	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0 CB	209	break;
5288fbf0 CB	210	default:
b8e660b8	211	rc = -EOPNOTSUPP;
5288fbf0 CB	212	}
	213	return rc;
	214	}
	215
	216	static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
5a32c1af	217	u64 *reg)
5288fbf0	218	{
13b191ae TH	219	struct kvm_s390_local_interrupt *li;
13b191ae TH	220	struct kvm_vcpu *dst_vcpu = NULL;
180c12fb	221	struct kvm_s390_interrupt_info *inti;
5288fbf0	222	int rc;
5288fbf0	223
13b191ae TH	224	if (cpu_addr < KVM_MAX_VCPUS)
	225	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	226	if (!dst_vcpu)
	227	return SIGP_CC_NOT_OPERATIONAL;
	228	li = &dst_vcpu->arch.local_int;
	229
665170cb HC	230	/*
	231	* Make sure the new value is valid memory. We only need to check the
	232	* first page, since address is 8k aligned and memory pieces are always
	233	* at least 1MB aligned and have at least a size of 1MB.
	234	*/
	235	address &= 0x7fffe000u;
	236	if (kvm_is_error_gpa(vcpu->kvm, address)) {
0744426e	237	*reg &= 0xffffffff00000000UL;
a9ae32c3	238	*reg \|= SIGP_STATUS_INVALID_PARAMETER;
ea1918dd	239	return SIGP_CC_STATUS_STORED;
5288fbf0 CB	240	}
	241
	242	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	243	if (!inti)
ea1918dd	244	return SIGP_CC_BUSY;
5288fbf0	245
4ae3c081	246	spin_lock(&li->lock);
5288fbf0	247	/* cpu must be in stopped state */
9e6dabef	248	if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
0744426e HC	249	*reg &= 0xffffffff00000000UL;
0744426e HC	250	*reg \|= SIGP_STATUS_INCORRECT_STATE;
ea1918dd	251	rc = SIGP_CC_STATUS_STORED;
5288fbf0 CB	252	kfree(inti);
	253	goto out_li;
	254	}
	255
	256	inti->type = KVM_S390_SIGP_SET_PREFIX;
	257	inti->prefix.address = address;
	258
	259	list_add_tail(&inti->list, &li->list);
	260	atomic_set(&li->active, 1);
d0321a24 CB	261	if (waitqueue_active(li->wq))
d0321a24 CB	262	wake_up_interruptible(li->wq);
ea1918dd	263	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0 CB	264
	265	VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
	266	out_li:
4ae3c081	267	spin_unlock(&li->lock);
5288fbf0 CB	268	return rc;
	269	}
	270
00e9e435 TH	271	static int __sigp_store_status_at_addr(struct kvm_vcpu *vcpu, u16 cpu_id,
	272	u32 addr, u64 *reg)
	273	{
	274	struct kvm_vcpu *dst_vcpu = NULL;
	275	int flags;
	276	int rc;
	277
	278	if (cpu_id < KVM_MAX_VCPUS)
	279	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_id);
	280	if (!dst_vcpu)
	281	return SIGP_CC_NOT_OPERATIONAL;
	282
4ae3c081	283	spin_lock(&dst_vcpu->arch.local_int.lock);
00e9e435	284	flags = atomic_read(dst_vcpu->arch.local_int.cpuflags);
4ae3c081	285	spin_unlock(&dst_vcpu->arch.local_int.lock);
00e9e435 TH	286	if (!(flags & CPUSTAT_STOPPED)) {
	287	*reg &= 0xffffffff00000000UL;
	288	*reg \|= SIGP_STATUS_INCORRECT_STATE;
	289	return SIGP_CC_STATUS_STORED;
	290	}
	291
	292	addr &= 0x7ffffe00;
	293	rc = kvm_s390_store_status_unloaded(dst_vcpu, addr);
	294	if (rc == -EFAULT) {
	295	*reg &= 0xffffffff00000000UL;
	296	*reg \|= SIGP_STATUS_INVALID_PARAMETER;
	297	rc = SIGP_CC_STATUS_STORED;
	298	}
	299	return rc;
	300	}
	301
bd59d3a4	302	static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr,
5a32c1af	303	u64 *reg)
bd59d3a4	304	{
1ee0bc55 JF	305	struct kvm_s390_local_interrupt *li;
1ee0bc55 JF	306	struct kvm_vcpu *dst_vcpu = NULL;
bd59d3a4	307	int rc;
bd59d3a4 CH	308
bd59d3a4 CH	309	if (cpu_addr >= KVM_MAX_VCPUS)
ea1918dd	310	return SIGP_CC_NOT_OPERATIONAL;
bd59d3a4	311
1ee0bc55 JF	312	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	313	if (!dst_vcpu)
	314	return SIGP_CC_NOT_OPERATIONAL;
	315	li = &dst_vcpu->arch.local_int;
	316	if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
	317	/* running */
	318	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
	319	} else {
	320	/* not running */
	321	*reg &= 0xffffffff00000000UL;
	322	*reg \|= SIGP_STATUS_NOT_RUNNING;
	323	rc = SIGP_CC_STATUS_STORED;
bd59d3a4	324	}
bd59d3a4 CH	325
	326	VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x", cpu_addr,
	327	rc);
	328
	329	return rc;
	330	}
	331
cc92d6de TH	332	/* Test whether the destination CPU is available and not busy */
cc92d6de TH	333	static int sigp_check_callable(struct kvm_vcpu *vcpu, u16 cpu_addr)
151104a7	334	{
151104a7	335	struct kvm_s390_local_interrupt *li;
ea1918dd	336	int rc = SIGP_CC_ORDER_CODE_ACCEPTED;
1ee0bc55	337	struct kvm_vcpu *dst_vcpu = NULL;
151104a7 JF	338
151104a7 JF	339	if (cpu_addr >= KVM_MAX_VCPUS)
ea1918dd	340	return SIGP_CC_NOT_OPERATIONAL;
151104a7	341
1ee0bc55 JF	342	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	343	if (!dst_vcpu)
	344	return SIGP_CC_NOT_OPERATIONAL;
	345	li = &dst_vcpu->arch.local_int;
4ae3c081	346	spin_lock(&li->lock);
151104a7	347	if (li->action_bits & ACTION_STOP_ON_STOP)
ea1918dd	348	rc = SIGP_CC_BUSY;
4ae3c081	349	spin_unlock(&li->lock);
1ee0bc55	350
151104a7 JF	351	return rc;
	352	}
	353
5288fbf0 CB	354	int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
	355	{
	356	int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
	357	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
5288fbf0	358	u32 parameter;
5a32c1af	359	u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
5288fbf0 CB	360	u8 order_code;
	361	int rc;
	362
3eb77d51 CB	363	/* sigp in userspace can exit */
3eb77d51 CB	364	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
208dd756	365	return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
3eb77d51	366
b1c571a5	367	order_code = kvm_s390_get_base_disp_rs(vcpu);
5288fbf0 CB	368
5288fbf0 CB	369	if (r1 % 2)
5a32c1af	370	parameter = vcpu->run->s.regs.gprs[r1];
5288fbf0	371	else
5a32c1af	372	parameter = vcpu->run->s.regs.gprs[r1 + 1];
5288fbf0	373
5786fffa	374	trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter);
5288fbf0 CB	375	switch (order_code) {
	376	case SIGP_SENSE:
	377	vcpu->stat.instruction_sigp_sense++;
	378	rc = __sigp_sense(vcpu, cpu_addr,
5a32c1af	379	&vcpu->run->s.regs.gprs[r1]);
5288fbf0	380	break;
7697e71f CE	381	case SIGP_EXTERNAL_CALL:
	382	vcpu->stat.instruction_sigp_external_call++;
	383	rc = __sigp_external_call(vcpu, cpu_addr);
	384	break;
a9ae32c3	385	case SIGP_EMERGENCY_SIGNAL:
5288fbf0 CB	386	vcpu->stat.instruction_sigp_emergency++;
	387	rc = __sigp_emergency(vcpu, cpu_addr);
	388	break;
	389	case SIGP_STOP:
	390	vcpu->stat.instruction_sigp_stop++;
9ace903d	391	rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP);
5288fbf0	392	break;
a9ae32c3	393	case SIGP_STOP_AND_STORE_STATUS:
5288fbf0	394	vcpu->stat.instruction_sigp_stop++;
9ec2d6dc JF	395	rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP \|
9ec2d6dc JF	396	ACTION_STOP_ON_STOP);
5288fbf0	397	break;
00e9e435 TH	398	case SIGP_STORE_STATUS_AT_ADDRESS:
	399	rc = __sigp_store_status_at_addr(vcpu, cpu_addr, parameter,
	400	&vcpu->run->s.regs.gprs[r1]);
	401	break;
a9ae32c3	402	case SIGP_SET_ARCHITECTURE:
5288fbf0 CB	403	vcpu->stat.instruction_sigp_arch++;
	404	rc = __sigp_set_arch(vcpu, parameter);
	405	break;
	406	case SIGP_SET_PREFIX:
	407	vcpu->stat.instruction_sigp_prefix++;
	408	rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
5a32c1af	409	&vcpu->run->s.regs.gprs[r1]);
5288fbf0	410	break;
b13d3580 TH	411	case SIGP_COND_EMERGENCY_SIGNAL:
	412	rc = __sigp_conditional_emergency(vcpu, cpu_addr, parameter,
	413	&vcpu->run->s.regs.gprs[r1]);
	414	break;
bd59d3a4 CH	415	case SIGP_SENSE_RUNNING:
	416	vcpu->stat.instruction_sigp_sense_running++;
	417	rc = __sigp_sense_running(vcpu, cpu_addr,
5a32c1af	418	&vcpu->run->s.regs.gprs[r1]);
bd59d3a4	419	break;
58bc33b2 TH	420	case SIGP_START:
	421	rc = sigp_check_callable(vcpu, cpu_addr);
	422	if (rc == SIGP_CC_ORDER_CODE_ACCEPTED)
	423	rc = -EOPNOTSUPP; /* Handle START in user space */
	424	break;
5288fbf0 CB	425	case SIGP_RESTART:
5288fbf0 CB	426	vcpu->stat.instruction_sigp_restart++;
cc92d6de TH	427	rc = sigp_check_callable(vcpu, cpu_addr);
	428	if (rc == SIGP_CC_ORDER_CODE_ACCEPTED) {
	429	VCPU_EVENT(vcpu, 4,
	430	"sigp restart %x to handle userspace",
	431	cpu_addr);
	432	/* user space must know about restart */
	433	rc = -EOPNOTSUPP;
	434	}
	435	break;
5288fbf0	436	default:
b8e660b8	437	return -EOPNOTSUPP;
5288fbf0 CB	438	}
	439
	440	if (rc < 0)
	441	return rc;
	442
949c007a	443	kvm_s390_set_psw_cc(vcpu, rc);
5288fbf0 CB	444	return 0;
5288fbf0 CB	445	}
4953919f DH	446
	447	/*
	448	* Handle SIGP partial execution interception.
	449	*
	450	* This interception will occur at the source cpu when a source cpu sends an
	451	* external call to a target cpu and the target cpu has the WAIT bit set in
	452	* its cpuflags. Interception will occurr after the interrupt indicator bits at
	453	* the target cpu have been set. All error cases will lead to instruction
	454	* interception, therefore nothing is to be checked or prepared.
	455	*/
	456	int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu)
	457	{
	458	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
	459	u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
	460	struct kvm_vcpu *dest_vcpu;
	461	u8 order_code = kvm_s390_get_base_disp_rs(vcpu);
	462
	463	trace_kvm_s390_handle_sigp_pei(vcpu, order_code, cpu_addr);
	464
	465	if (order_code == SIGP_EXTERNAL_CALL) {
	466	dest_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	467	BUG_ON(dest_vcpu == NULL);
	468
4ae3c081	469	spin_lock(&dest_vcpu->arch.local_int.lock);
4953919f DH	470	if (waitqueue_active(&dest_vcpu->wq))
	471	wake_up_interruptible(&dest_vcpu->wq);
	472	dest_vcpu->preempted = true;
4ae3c081	473	spin_unlock(&dest_vcpu->arch.local_int.lock);
4953919f DH	474
	475	kvm_s390_set_psw_cc(vcpu, SIGP_CC_ORDER_CODE_ACCEPTED);
	476	return 0;
	477	}
	478
	479	return -EOPNOTSUPP;
	480	}