[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_vcpu *dst_vcpu, int action)
{
	struct kvm_s390_local_interrupt *li = &dst_vcpu->arch.local_int;
	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 */
		kfree(inti);
		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);
	kvm_s390_vcpu_wakeup(dst_vcpu);
out:
	spin_unlock(&li->lock);

	return rc;
}

static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action)
{
	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;

	rc = __inject_sigp_stop(dst_vcpu, 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);
	kvm_s390_vcpu_wakeup(dst_vcpu);
	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;
}

static int handle_sigp_dst(struct kvm_vcpu *vcpu, u8 order_code,
			   u16 cpu_addr, u32 parameter, u64 *status_reg)
{
	int rc;

	switch (order_code) {
	case SIGP_SENSE:
		vcpu->stat.instruction_sigp_sense++;
		rc = __sigp_sense(vcpu, cpu_addr, status_reg);
		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,
						 status_reg);
		break;
	case SIGP_SET_PREFIX:
		vcpu->stat.instruction_sigp_prefix++;
		rc = __sigp_set_prefix(vcpu, cpu_addr, parameter, status_reg);
		break;
	case SIGP_COND_EMERGENCY_SIGNAL:
		rc = __sigp_conditional_emergency(vcpu, cpu_addr, parameter,
						  status_reg);
		break;
	case SIGP_SENSE_RUNNING:
		vcpu->stat.instruction_sigp_sense_running++;
		rc = __sigp_sense_running(vcpu, cpu_addr, status_reg);
		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:
		rc = -EOPNOTSUPP;
	}

	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_SET_ARCHITECTURE:
		vcpu->stat.instruction_sigp_arch++;
		rc = __sigp_set_arch(vcpu, parameter);
		break;
	default:
		rc = handle_sigp_dst(vcpu, order_code, cpu_addr,
				     parameter,
				     &vcpu->run->s.regs.gprs[r1]);
	}

	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);

		kvm_s390_vcpu_wakeup(dest_vcpu);
		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
0e9c85a5	128	static int __inject_sigp_stop(struct kvm_vcpu *dst_vcpu, int action)
5288fbf0	129	{
0e9c85a5	130	struct kvm_s390_local_interrupt *li = &dst_vcpu->arch.local_int;
180c12fb	131	struct kvm_s390_interrupt_info *inti;
e879892c	132	int rc = SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0	133
9940fa80	134	inti = kzalloc(sizeof(*inti), GFP_ATOMIC);
5288fbf0 CB	135	if (!inti)
5288fbf0 CB	136	return -ENOMEM;
5288fbf0 CB	137	inti->type = KVM_S390_SIGP_STOP;
5288fbf0 CB	138
4ae3c081	139	spin_lock(&li->lock);
7dfc63cf DH	140	if (li->action_bits & ACTION_STOP_ON_STOP) {
7dfc63cf DH	141	/* another SIGP STOP is pending */
d514f426	142	kfree(inti);
7dfc63cf DH	143	rc = SIGP_CC_BUSY;
	144	goto out;
	145	}
a046b816 CD	146	if ((atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
a046b816 CD	147	kfree(inti);
e879892c TH	148	if ((action & ACTION_STORE_ON_STOP) != 0)
e879892c TH	149	rc = -ESHUTDOWN;
24a13044	150	goto out;
a046b816	151	}
5288fbf0 CB	152	list_add_tail(&inti->list, &li->list);
5288fbf0 CB	153	atomic_set(&li->active, 1);
9ace903d	154	li->action_bits \|= action;
7dfc63cf	155	atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
0e9c85a5	156	kvm_s390_vcpu_wakeup(dst_vcpu);
24a13044	157	out:
4ae3c081	158	spin_unlock(&li->lock);
9ace903d	159
e879892c	160	return rc;
9ace903d CE	161	}
	162
	163	static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action)
	164	{
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;
9ace903d	174
0e9c85a5	175	rc = __inject_sigp_stop(dst_vcpu, action);
9ace903d	176
5288fbf0	177	VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
e879892c TH	178
	179	if ((action & ACTION_STORE_ON_STOP) != 0 && rc == -ESHUTDOWN) {
	180	/* If the CPU has already been stopped, we still have
	181	* to save the status when doing stop-and-store. This
	182	* has to be done after unlocking all spinlocks. */
e879892c TH	183	rc = kvm_s390_store_status_unloaded(dst_vcpu,
	184	KVM_S390_STORE_STATUS_NOADDR);
	185	}
	186
5288fbf0 CB	187	return rc;
	188	}
	189
	190	static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
	191	{
	192	int rc;
3c038e6b DD	193	unsigned int i;
3c038e6b DD	194	struct kvm_vcpu *v;
5288fbf0 CB	195
	196	switch (parameter & 0xff) {
	197	case 0:
ea1918dd	198	rc = SIGP_CC_NOT_OPERATIONAL;
5288fbf0 CB	199	break;
	200	case 1:
	201	case 2:
3c038e6b DD	202	kvm_for_each_vcpu(i, v, vcpu->kvm) {
	203	v->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
	204	kvm_clear_async_pf_completion_queue(v);
	205	}
	206
ea1918dd	207	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0 CB	208	break;
5288fbf0 CB	209	default:
b8e660b8	210	rc = -EOPNOTSUPP;
5288fbf0 CB	211	}
	212	return rc;
	213	}
	214
	215	static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
5a32c1af	216	u64 *reg)
5288fbf0	217	{
13b191ae TH	218	struct kvm_s390_local_interrupt *li;
13b191ae TH	219	struct kvm_vcpu *dst_vcpu = NULL;
180c12fb	220	struct kvm_s390_interrupt_info *inti;
5288fbf0	221	int rc;
5288fbf0	222
13b191ae TH	223	if (cpu_addr < KVM_MAX_VCPUS)
	224	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	225	if (!dst_vcpu)
	226	return SIGP_CC_NOT_OPERATIONAL;
	227	li = &dst_vcpu->arch.local_int;
	228
665170cb HC	229	/*
	230	* Make sure the new value is valid memory. We only need to check the
	231	* first page, since address is 8k aligned and memory pieces are always
	232	* at least 1MB aligned and have at least a size of 1MB.
	233	*/
	234	address &= 0x7fffe000u;
	235	if (kvm_is_error_gpa(vcpu->kvm, address)) {
0744426e	236	*reg &= 0xffffffff00000000UL;
a9ae32c3	237	*reg \|= SIGP_STATUS_INVALID_PARAMETER;
ea1918dd	238	return SIGP_CC_STATUS_STORED;
5288fbf0 CB	239	}
	240
	241	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	242	if (!inti)
ea1918dd	243	return SIGP_CC_BUSY;
5288fbf0	244
4ae3c081	245	spin_lock(&li->lock);
5288fbf0	246	/* cpu must be in stopped state */
9e6dabef	247	if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
0744426e HC	248	*reg &= 0xffffffff00000000UL;
0744426e HC	249	*reg \|= SIGP_STATUS_INCORRECT_STATE;
ea1918dd	250	rc = SIGP_CC_STATUS_STORED;
5288fbf0 CB	251	kfree(inti);
	252	goto out_li;
	253	}
	254
	255	inti->type = KVM_S390_SIGP_SET_PREFIX;
	256	inti->prefix.address = address;
	257
	258	list_add_tail(&inti->list, &li->list);
	259	atomic_set(&li->active, 1);
0e9c85a5	260	kvm_s390_vcpu_wakeup(dst_vcpu);
ea1918dd	261	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0 CB	262
	263	VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
	264	out_li:
4ae3c081	265	spin_unlock(&li->lock);
5288fbf0 CB	266	return rc;
	267	}
	268
00e9e435 TH	269	static int __sigp_store_status_at_addr(struct kvm_vcpu *vcpu, u16 cpu_id,
	270	u32 addr, u64 *reg)
	271	{
	272	struct kvm_vcpu *dst_vcpu = NULL;
	273	int flags;
	274	int rc;
	275
	276	if (cpu_id < KVM_MAX_VCPUS)
	277	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_id);
	278	if (!dst_vcpu)
	279	return SIGP_CC_NOT_OPERATIONAL;
	280
4ae3c081	281	spin_lock(&dst_vcpu->arch.local_int.lock);
00e9e435	282	flags = atomic_read(dst_vcpu->arch.local_int.cpuflags);
4ae3c081	283	spin_unlock(&dst_vcpu->arch.local_int.lock);
00e9e435 TH	284	if (!(flags & CPUSTAT_STOPPED)) {
	285	*reg &= 0xffffffff00000000UL;
	286	*reg \|= SIGP_STATUS_INCORRECT_STATE;
	287	return SIGP_CC_STATUS_STORED;
	288	}
	289
	290	addr &= 0x7ffffe00;
	291	rc = kvm_s390_store_status_unloaded(dst_vcpu, addr);
	292	if (rc == -EFAULT) {
	293	*reg &= 0xffffffff00000000UL;
	294	*reg \|= SIGP_STATUS_INVALID_PARAMETER;
	295	rc = SIGP_CC_STATUS_STORED;
	296	}
	297	return rc;
	298	}
	299
bd59d3a4	300	static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr,
5a32c1af	301	u64 *reg)
bd59d3a4	302	{
1ee0bc55 JF	303	struct kvm_s390_local_interrupt *li;
1ee0bc55 JF	304	struct kvm_vcpu *dst_vcpu = NULL;
bd59d3a4	305	int rc;
bd59d3a4 CH	306
bd59d3a4 CH	307	if (cpu_addr >= KVM_MAX_VCPUS)
ea1918dd	308	return SIGP_CC_NOT_OPERATIONAL;
bd59d3a4	309
1ee0bc55 JF	310	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	311	if (!dst_vcpu)
	312	return SIGP_CC_NOT_OPERATIONAL;
	313	li = &dst_vcpu->arch.local_int;
	314	if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
	315	/* running */
	316	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
	317	} else {
	318	/* not running */
	319	*reg &= 0xffffffff00000000UL;
	320	*reg \|= SIGP_STATUS_NOT_RUNNING;
	321	rc = SIGP_CC_STATUS_STORED;
bd59d3a4	322	}
bd59d3a4 CH	323
	324	VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x", cpu_addr,
	325	rc);
	326
	327	return rc;
	328	}
	329
cc92d6de TH	330	/* Test whether the destination CPU is available and not busy */
cc92d6de TH	331	static int sigp_check_callable(struct kvm_vcpu *vcpu, u16 cpu_addr)
151104a7	332	{
151104a7	333	struct kvm_s390_local_interrupt *li;
ea1918dd	334	int rc = SIGP_CC_ORDER_CODE_ACCEPTED;
1ee0bc55	335	struct kvm_vcpu *dst_vcpu = NULL;
151104a7 JF	336
151104a7 JF	337	if (cpu_addr >= KVM_MAX_VCPUS)
ea1918dd	338	return SIGP_CC_NOT_OPERATIONAL;
151104a7	339
1ee0bc55 JF	340	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	341	if (!dst_vcpu)
	342	return SIGP_CC_NOT_OPERATIONAL;
	343	li = &dst_vcpu->arch.local_int;
4ae3c081	344	spin_lock(&li->lock);
151104a7	345	if (li->action_bits & ACTION_STOP_ON_STOP)
ea1918dd	346	rc = SIGP_CC_BUSY;
4ae3c081	347	spin_unlock(&li->lock);
1ee0bc55	348
151104a7 JF	349	return rc;
	350	}
	351
3526a66b DH	352	static int handle_sigp_dst(struct kvm_vcpu *vcpu, u8 order_code,
3526a66b DH	353	u16 cpu_addr, u32 parameter, u64 *status_reg)
5288fbf0	354	{
5288fbf0 CB	355	int rc;
5288fbf0 CB	356
5288fbf0 CB	357	switch (order_code) {
	358	case SIGP_SENSE:
	359	vcpu->stat.instruction_sigp_sense++;
3526a66b	360	rc = __sigp_sense(vcpu, cpu_addr, status_reg);
5288fbf0	361	break;
7697e71f CE	362	case SIGP_EXTERNAL_CALL:
	363	vcpu->stat.instruction_sigp_external_call++;
	364	rc = __sigp_external_call(vcpu, cpu_addr);
	365	break;
a9ae32c3	366	case SIGP_EMERGENCY_SIGNAL:
5288fbf0 CB	367	vcpu->stat.instruction_sigp_emergency++;
	368	rc = __sigp_emergency(vcpu, cpu_addr);
	369	break;
	370	case SIGP_STOP:
	371	vcpu->stat.instruction_sigp_stop++;
9ace903d	372	rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP);
5288fbf0	373	break;
a9ae32c3	374	case SIGP_STOP_AND_STORE_STATUS:
5288fbf0	375	vcpu->stat.instruction_sigp_stop++;
9ec2d6dc JF	376	rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP \|
9ec2d6dc JF	377	ACTION_STOP_ON_STOP);
5288fbf0	378	break;
00e9e435 TH	379	case SIGP_STORE_STATUS_AT_ADDRESS:
00e9e435 TH	380	rc = __sigp_store_status_at_addr(vcpu, cpu_addr, parameter,
3526a66b	381	status_reg);
5288fbf0 CB	382	break;
	383	case SIGP_SET_PREFIX:
	384	vcpu->stat.instruction_sigp_prefix++;
3526a66b	385	rc = __sigp_set_prefix(vcpu, cpu_addr, parameter, status_reg);
5288fbf0	386	break;
b13d3580 TH	387	case SIGP_COND_EMERGENCY_SIGNAL:
b13d3580 TH	388	rc = __sigp_conditional_emergency(vcpu, cpu_addr, parameter,
3526a66b	389	status_reg);
b13d3580	390	break;
bd59d3a4 CH	391	case SIGP_SENSE_RUNNING:
bd59d3a4 CH	392	vcpu->stat.instruction_sigp_sense_running++;
3526a66b	393	rc = __sigp_sense_running(vcpu, cpu_addr, status_reg);
bd59d3a4	394	break;
58bc33b2 TH	395	case SIGP_START:
	396	rc = sigp_check_callable(vcpu, cpu_addr);
	397	if (rc == SIGP_CC_ORDER_CODE_ACCEPTED)
	398	rc = -EOPNOTSUPP; /* Handle START in user space */
	399	break;
5288fbf0 CB	400	case SIGP_RESTART:
5288fbf0 CB	401	vcpu->stat.instruction_sigp_restart++;
cc92d6de TH	402	rc = sigp_check_callable(vcpu, cpu_addr);
	403	if (rc == SIGP_CC_ORDER_CODE_ACCEPTED) {
	404	VCPU_EVENT(vcpu, 4,
	405	"sigp restart %x to handle userspace",
	406	cpu_addr);
	407	/* user space must know about restart */
	408	rc = -EOPNOTSUPP;
	409	}
	410	break;
5288fbf0	411	default:
3526a66b DH	412	rc = -EOPNOTSUPP;
	413	}
	414
	415	return rc;
	416	}
	417
	418	int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
	419	{
	420	int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
	421	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
	422	u32 parameter;
	423	u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
	424	u8 order_code;
	425	int rc;
	426
	427	/* sigp in userspace can exit */
	428	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
	429	return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
	430
	431	order_code = kvm_s390_get_base_disp_rs(vcpu);
	432
	433	if (r1 % 2)
	434	parameter = vcpu->run->s.regs.gprs[r1];
	435	else
	436	parameter = vcpu->run->s.regs.gprs[r1 + 1];
	437
	438	trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter);
	439	switch (order_code) {
	440	case SIGP_SET_ARCHITECTURE:
	441	vcpu->stat.instruction_sigp_arch++;
	442	rc = __sigp_set_arch(vcpu, parameter);
	443	break;
	444	default:
	445	rc = handle_sigp_dst(vcpu, order_code, cpu_addr,
	446	parameter,
	447	&vcpu->run->s.regs.gprs[r1]);
5288fbf0 CB	448	}
	449
	450	if (rc < 0)
	451	return rc;
	452
949c007a	453	kvm_s390_set_psw_cc(vcpu, rc);
5288fbf0 CB	454	return 0;
5288fbf0 CB	455	}
4953919f DH	456
	457	/*
	458	* Handle SIGP partial execution interception.
	459	*
	460	* This interception will occur at the source cpu when a source cpu sends an
	461	* external call to a target cpu and the target cpu has the WAIT bit set in
	462	* its cpuflags. Interception will occurr after the interrupt indicator bits at
	463	* the target cpu have been set. All error cases will lead to instruction
	464	* interception, therefore nothing is to be checked or prepared.
	465	*/
	466	int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu)
	467	{
	468	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
	469	u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
	470	struct kvm_vcpu *dest_vcpu;
	471	u8 order_code = kvm_s390_get_base_disp_rs(vcpu);
	472
	473	trace_kvm_s390_handle_sigp_pei(vcpu, order_code, cpu_addr);
	474
	475	if (order_code == SIGP_EXTERNAL_CALL) {
	476	dest_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	477	BUG_ON(dest_vcpu == NULL);
	478
0e9c85a5	479	kvm_s390_vcpu_wakeup(dest_vcpu);
4953919f DH	480	kvm_s390_set_psw_cc(vcpu, SIGP_CC_ORDER_CODE_ACCEPTED);
	481	return 0;
	482	}
	483
	484	return -EOPNOTSUPP;
	485	}