[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, struct kvm_vcpu *dst_vcpu,
			u64 *reg)
{
	struct kvm_s390_local_interrupt *li;
	int cpuflags;
	int rc;
	int ext_call_pending;

	li = &dst_vcpu->arch.local_int;

	cpuflags = atomic_read(li->cpuflags);
	ext_call_pending = kvm_s390_ext_call_pending(dst_vcpu);
	if (!(cpuflags & CPUSTAT_STOPPED) && !ext_call_pending)
		rc = SIGP_CC_ORDER_CODE_ACCEPTED;
	else {
		*reg &= 0xffffffff00000000UL;
		if (ext_call_pending)
			*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", dst_vcpu->vcpu_id,
		   rc);
	return rc;
}

static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
				    struct kvm_vcpu *dst_vcpu)
{
	struct kvm_s390_irq irq = {
		.type = KVM_S390_INT_EMERGENCY,
		.u.emerg.code = vcpu->vcpu_id,
	};
	int rc = 0;

	rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
	if (!rc)
		VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x",
			   dst_vcpu->vcpu_id);

	return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
}

static int __sigp_emergency(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu)
{
	return __inject_sigp_emergency(vcpu, dst_vcpu);
}

static int __sigp_conditional_emergency(struct kvm_vcpu *vcpu,
					struct kvm_vcpu *dst_vcpu,
					u16 asn, u64 *reg)
{
	const u64 psw_int_mask = PSW_MASK_IO | PSW_MASK_EXT;
	u16 p_asn, s_asn;
	psw_t *psw;
	u32 flags;

	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 */

	/* Inject 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 __inject_sigp_emergency(vcpu, dst_vcpu);
	} else {
		*reg &= 0xffffffff00000000UL;
		*reg |= SIGP_STATUS_INCORRECT_STATE;
		return SIGP_CC_STATUS_STORED;
	}
}

static int __sigp_external_call(struct kvm_vcpu *vcpu,
				struct kvm_vcpu *dst_vcpu, u64 *reg)
{
	struct kvm_s390_irq irq = {
		.type = KVM_S390_INT_EXTERNAL_CALL,
		.u.extcall.code = vcpu->vcpu_id,
	};
	int rc;

	rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
	if (rc == -EBUSY) {
		*reg &= 0xffffffff00000000UL;
		*reg |= SIGP_STATUS_EXT_CALL_PENDING;
		return SIGP_CC_STATUS_STORED;
	} else if (rc == 0) {
		VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x",
			   dst_vcpu->vcpu_id);
	}

	return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
}

static int __sigp_stop(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu)
{
	struct kvm_s390_irq irq = {
		.type = KVM_S390_SIGP_STOP,
	};
	int rc;

	rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
	if (rc == -EBUSY)
		rc = SIGP_CC_BUSY;
	else if (rc == 0)
		VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x",
			   dst_vcpu->vcpu_id);

	return rc;
}

static int __sigp_stop_and_store_status(struct kvm_vcpu *vcpu,
					struct kvm_vcpu *dst_vcpu, u64 *reg)
{
	struct kvm_s390_irq irq = {
		.type = KVM_S390_SIGP_STOP,
		.u.stop.flags = KVM_S390_STOP_FLAG_STORE_STATUS,
	};
	int rc;

	rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
	if (rc == -EBUSY)
		rc = SIGP_CC_BUSY;
	else if (rc == 0)
		VCPU_EVENT(vcpu, 4, "sent sigp stop and store status to cpu %x",
			   dst_vcpu->vcpu_id);

	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, struct kvm_vcpu *dst_vcpu,
			     u32 address, u64 *reg)
{
	struct kvm_s390_irq irq = {
		.type = KVM_S390_SIGP_SET_PREFIX,
		.u.prefix.address = address & 0x7fffe000u,
	};
	int rc;

	/*
	 * 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.
	 */
	if (kvm_is_error_gpa(vcpu->kvm, irq.u.prefix.address)) {
		*reg &= 0xffffffff00000000UL;
		*reg |= SIGP_STATUS_INVALID_PARAMETER;
		return SIGP_CC_STATUS_STORED;
	}

	rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
	if (rc == -EBUSY) {
		*reg &= 0xffffffff00000000UL;
		*reg |= SIGP_STATUS_INCORRECT_STATE;
		return SIGP_CC_STATUS_STORED;
	}

	return rc;
}

static int __sigp_store_status_at_addr(struct kvm_vcpu *vcpu,
				       struct kvm_vcpu *dst_vcpu,
				       u32 addr, u64 *reg)
{
	int flags;
	int rc;

	flags = atomic_read(dst_vcpu->arch.local_int.cpuflags);
	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,
				struct kvm_vcpu *dst_vcpu, u64 *reg)
{
	struct kvm_s390_local_interrupt *li;
	int rc;

	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",
		   dst_vcpu->vcpu_id, rc);

	return rc;
}

static int __prepare_sigp_re_start(struct kvm_vcpu *vcpu,
				   struct kvm_vcpu *dst_vcpu, u8 order_code)
{
	struct kvm_s390_local_interrupt *li = &dst_vcpu->arch.local_int;
	/* handle (RE)START in user space */
	int rc = -EOPNOTSUPP;

	/* make sure we don't race with STOP irq injection */
	spin_lock(&li->lock);
	if (kvm_s390_is_stop_irq_pending(dst_vcpu))
		rc = SIGP_CC_BUSY;
	spin_unlock(&li->lock);

	return rc;
}

static int __prepare_sigp_cpu_reset(struct kvm_vcpu *vcpu,
				    struct kvm_vcpu *dst_vcpu, u8 order_code)
{
	/* handle (INITIAL) CPU RESET in user space */
	return -EOPNOTSUPP;
}

static int __prepare_sigp_unknown(struct kvm_vcpu *vcpu,
				  struct kvm_vcpu *dst_vcpu)
{
	/* handle unknown orders in user space */
	return -EOPNOTSUPP;
}

static int handle_sigp_dst(struct kvm_vcpu *vcpu, u8 order_code,
			   u16 cpu_addr, u32 parameter, u64 *status_reg)
{
	int rc;
	struct kvm_vcpu *dst_vcpu = kvm_get_vcpu_by_id(vcpu->kvm, cpu_addr);

	if (!dst_vcpu)
		return SIGP_CC_NOT_OPERATIONAL;

	switch (order_code) {
	case SIGP_SENSE:
		vcpu->stat.instruction_sigp_sense++;
		rc = __sigp_sense(vcpu, dst_vcpu, status_reg);
		break;
	case SIGP_EXTERNAL_CALL:
		vcpu->stat.instruction_sigp_external_call++;
		rc = __sigp_external_call(vcpu, dst_vcpu, status_reg);
		break;
	case SIGP_EMERGENCY_SIGNAL:
		vcpu->stat.instruction_sigp_emergency++;
		rc = __sigp_emergency(vcpu, dst_vcpu);
		break;
	case SIGP_STOP:
		vcpu->stat.instruction_sigp_stop++;
		rc = __sigp_stop(vcpu, dst_vcpu);
		break;
	case SIGP_STOP_AND_STORE_STATUS:
		vcpu->stat.instruction_sigp_stop_store_status++;
		rc = __sigp_stop_and_store_status(vcpu, dst_vcpu, status_reg);
		break;
	case SIGP_STORE_STATUS_AT_ADDRESS:
		vcpu->stat.instruction_sigp_store_status++;
		rc = __sigp_store_status_at_addr(vcpu, dst_vcpu, parameter,
						 status_reg);
		break;
	case SIGP_SET_PREFIX:
		vcpu->stat.instruction_sigp_prefix++;
		rc = __sigp_set_prefix(vcpu, dst_vcpu, parameter, status_reg);
		break;
	case SIGP_COND_EMERGENCY_SIGNAL:
		vcpu->stat.instruction_sigp_cond_emergency++;
		rc = __sigp_conditional_emergency(vcpu, dst_vcpu, parameter,
						  status_reg);
		break;
	case SIGP_SENSE_RUNNING:
		vcpu->stat.instruction_sigp_sense_running++;
		rc = __sigp_sense_running(vcpu, dst_vcpu, status_reg);
		break;
	case SIGP_START:
		vcpu->stat.instruction_sigp_start++;
		rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
		break;
	case SIGP_RESTART:
		vcpu->stat.instruction_sigp_restart++;
		rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
		break;
	case SIGP_INITIAL_CPU_RESET:
		vcpu->stat.instruction_sigp_init_cpu_reset++;
		rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
		break;
	case SIGP_CPU_RESET:
		vcpu->stat.instruction_sigp_cpu_reset++;
		rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
		break;
	default:
		vcpu->stat.instruction_sigp_unknown++;
		rc = __prepare_sigp_unknown(vcpu, dst_vcpu);
	}

	if (rc == -EOPNOTSUPP)
		VCPU_EVENT(vcpu, 4,
			   "sigp order %u -> cpu %x: handled in user space",
			   order_code, dst_vcpu->vcpu_id);

	return rc;
}

static int handle_sigp_order_in_user_space(struct kvm_vcpu *vcpu, u8 order_code,
					   u16 cpu_addr)
{
	if (!vcpu->kvm->arch.user_sigp)
		return 0;

	switch (order_code) {
	case SIGP_SENSE:
	case SIGP_EXTERNAL_CALL:
	case SIGP_EMERGENCY_SIGNAL:
	case SIGP_COND_EMERGENCY_SIGNAL:
	case SIGP_SENSE_RUNNING:
		return 0;
	/* update counters as we're directly dropping to user space */
	case SIGP_STOP:
		vcpu->stat.instruction_sigp_stop++;
		break;
	case SIGP_STOP_AND_STORE_STATUS:
		vcpu->stat.instruction_sigp_stop_store_status++;
		break;
	case SIGP_STORE_STATUS_AT_ADDRESS:
		vcpu->stat.instruction_sigp_store_status++;
		break;
	case SIGP_STORE_ADDITIONAL_STATUS:
		vcpu->stat.instruction_sigp_store_adtl_status++;
		break;
	case SIGP_SET_PREFIX:
		vcpu->stat.instruction_sigp_prefix++;
		break;
	case SIGP_START:
		vcpu->stat.instruction_sigp_start++;
		break;
	case SIGP_RESTART:
		vcpu->stat.instruction_sigp_restart++;
		break;
	case SIGP_INITIAL_CPU_RESET:
		vcpu->stat.instruction_sigp_init_cpu_reset++;
		break;
	case SIGP_CPU_RESET:
		vcpu->stat.instruction_sigp_cpu_reset++;
		break;
	default:
		vcpu->stat.instruction_sigp_unknown++;
	}
	VCPU_EVENT(vcpu, 3, "SIGP: order %u for CPU %d handled in userspace",
		   order_code, cpu_addr);

	return 1;
}

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, NULL);
	if (handle_sigp_order_in_user_space(vcpu, order_code, cpu_addr))
		return -EOPNOTSUPP;

	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, NULL);

	trace_kvm_s390_handle_sigp_pei(vcpu, order_code, cpu_addr);

	if (order_code == SIGP_EXTERNAL_CALL) {
		dest_vcpu = kvm_get_vcpu_by_id(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
3d95c7d2	23	static int __sigp_sense(struct kvm_vcpu vcpu, struct kvm_vcpu dst_vcpu,
5a32c1af	24	u64 *reg)
5288fbf0	25	{
1ee0bc55	26	struct kvm_s390_local_interrupt *li;
1ee0bc55	27	int cpuflags;
5288fbf0	28	int rc;
ea5f4969	29	int ext_call_pending;
5288fbf0	30
1ee0bc55 JF	31	li = &dst_vcpu->arch.local_int;
	32
	33	cpuflags = atomic_read(li->cpuflags);
ea5f4969 DH	34	ext_call_pending = kvm_s390_ext_call_pending(dst_vcpu);
ea5f4969 DH	35	if (!(cpuflags & CPUSTAT_STOPPED) && !ext_call_pending)
21b26c08 CH	36	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
21b26c08 CH	37	else {
5288fbf0	38	*reg &= 0xffffffff00000000UL;
ea5f4969	39	if (ext_call_pending)
21b26c08	40	*reg \|= SIGP_STATUS_EXT_CALL_PENDING;
1ee0bc55	41	if (cpuflags & CPUSTAT_STOPPED)
21b26c08	42	*reg \|= SIGP_STATUS_STOPPED;
ea1918dd	43	rc = SIGP_CC_STATUS_STORED;
5288fbf0	44	}
5288fbf0	45
3d95c7d2 DH	46	VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", dst_vcpu->vcpu_id,
3d95c7d2 DH	47	rc);
5288fbf0 CB	48	return rc;
	49	}
	50
07b03035 DH	51	static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
07b03035 DH	52	struct kvm_vcpu *dst_vcpu)
5288fbf0	53	{
383d0b05	54	struct kvm_s390_irq irq = {
22ff4a33	55	.type = KVM_S390_INT_EMERGENCY,
383d0b05	56	.u.emerg.code = vcpu->vcpu_id,
22ff4a33	57	};
22ff4a33	58	int rc = 0;
5288fbf0	59
383d0b05	60	rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
22ff4a33	61	if (!rc)
3d95c7d2 DH	62	VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x",
3d95c7d2 DH	63	dst_vcpu->vcpu_id);
5288fbf0	64
22ff4a33	65	return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
7697e71f CE	66	}
7697e71f CE	67
07b03035 DH	68	static int __sigp_emergency(struct kvm_vcpu vcpu, struct kvm_vcpu dst_vcpu)
	69	{
	70	return __inject_sigp_emergency(vcpu, dst_vcpu);
	71	}
	72
3d95c7d2 DH	73	static int __sigp_conditional_emergency(struct kvm_vcpu *vcpu,
3d95c7d2 DH	74	struct kvm_vcpu *dst_vcpu,
b13d3580 TH	75	u16 asn, u64 *reg)
b13d3580 TH	76	{
b13d3580 TH	77	const u64 psw_int_mask = PSW_MASK_IO \| PSW_MASK_EXT;
	78	u16 p_asn, s_asn;
	79	psw_t *psw;
	80	u32 flags;
	81
b13d3580 TH	82	flags = atomic_read(&dst_vcpu->arch.sie_block->cpuflags);
	83	psw = &dst_vcpu->arch.sie_block->gpsw;
	84	p_asn = dst_vcpu->arch.sie_block->gcr[4] & 0xffff; /* Primary ASN */
	85	s_asn = dst_vcpu->arch.sie_block->gcr[3] & 0xffff; /* Secondary ASN */
	86
07b03035	87	/* Inject the emergency signal? */
b13d3580 TH	88	if (!(flags & CPUSTAT_STOPPED)
	89	\|\| (psw->mask & psw_int_mask) != psw_int_mask
	90	\|\| ((flags & CPUSTAT_WAIT) && psw->addr != 0)
	91	\|\| (!(flags & CPUSTAT_WAIT) && (asn == p_asn \|\| asn == s_asn))) {
07b03035	92	return __inject_sigp_emergency(vcpu, dst_vcpu);
b13d3580 TH	93	} else {
	94	*reg &= 0xffffffff00000000UL;
	95	*reg \|= SIGP_STATUS_INCORRECT_STATE;
	96	return SIGP_CC_STATUS_STORED;
	97	}
	98	}
	99
3d95c7d2	100	static int __sigp_external_call(struct kvm_vcpu *vcpu,
ea5f4969	101	struct kvm_vcpu dst_vcpu, u64 reg)
7697e71f	102	{
383d0b05	103	struct kvm_s390_irq irq = {
22ff4a33	104	.type = KVM_S390_INT_EXTERNAL_CALL,
383d0b05	105	.u.extcall.code = vcpu->vcpu_id,
22ff4a33	106	};
22ff4a33	107	int rc;
7697e71f	108
383d0b05	109	rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
ea5f4969 DH	110	if (rc == -EBUSY) {
	111	*reg &= 0xffffffff00000000UL;
	112	*reg \|= SIGP_STATUS_EXT_CALL_PENDING;
	113	return SIGP_CC_STATUS_STORED;
	114	} else if (rc == 0) {
3d95c7d2 DH	115	VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x",
3d95c7d2 DH	116	dst_vcpu->vcpu_id);
ea5f4969	117	}
7697e71f	118
22ff4a33	119	return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0 CB	120	}
5288fbf0 CB	121
a6cc3108	122	static int __sigp_stop(struct kvm_vcpu vcpu, struct kvm_vcpu dst_vcpu)
9ace903d	123	{
6cddd432 DH	124	struct kvm_s390_irq irq = {
	125	.type = KVM_S390_SIGP_STOP,
	126	};
9ace903d CE	127	int rc;
9ace903d CE	128
6cddd432 DH	129	rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
	130	if (rc == -EBUSY)
	131	rc = SIGP_CC_BUSY;
	132	else if (rc == 0)
	133	VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x",
	134	dst_vcpu->vcpu_id);
e879892c	135
a6cc3108 DH	136	return rc;
	137	}
	138
	139	static int __sigp_stop_and_store_status(struct kvm_vcpu *vcpu,
	140	struct kvm_vcpu dst_vcpu, u64 reg)
	141	{
6cddd432 DH	142	struct kvm_s390_irq irq = {
	143	.type = KVM_S390_SIGP_STOP,
	144	.u.stop.flags = KVM_S390_STOP_FLAG_STORE_STATUS,
	145	};
a6cc3108 DH	146	int rc;
a6cc3108 DH	147
6cddd432 DH	148	rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
	149	if (rc == -EBUSY)
	150	rc = SIGP_CC_BUSY;
	151	else if (rc == 0)
	152	VCPU_EVENT(vcpu, 4, "sent sigp stop and store status to cpu %x",
	153	dst_vcpu->vcpu_id);
e879892c	154
5288fbf0 CB	155	return rc;
	156	}
	157
	158	static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
	159	{
	160	int rc;
3c038e6b DD	161	unsigned int i;
3c038e6b DD	162	struct kvm_vcpu *v;
5288fbf0 CB	163
	164	switch (parameter & 0xff) {
	165	case 0:
ea1918dd	166	rc = SIGP_CC_NOT_OPERATIONAL;
5288fbf0 CB	167	break;
	168	case 1:
	169	case 2:
3c038e6b DD	170	kvm_for_each_vcpu(i, v, vcpu->kvm) {
	171	v->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
	172	kvm_clear_async_pf_completion_queue(v);
	173	}
	174
ea1918dd	175	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0 CB	176	break;
5288fbf0 CB	177	default:
b8e660b8	178	rc = -EOPNOTSUPP;
5288fbf0 CB	179	}
	180	return rc;
	181	}
	182
3d95c7d2 DH	183	static int __sigp_set_prefix(struct kvm_vcpu vcpu, struct kvm_vcpu dst_vcpu,
3d95c7d2 DH	184	u32 address, u64 *reg)
5288fbf0	185	{
a3a9c59a DH	186	struct kvm_s390_irq irq = {
	187	.type = KVM_S390_SIGP_SET_PREFIX,
	188	.u.prefix.address = address & 0x7fffe000u,
	189	};
5288fbf0	190	int rc;
5288fbf0	191
665170cb HC	192	/*
	193	* Make sure the new value is valid memory. We only need to check the
	194	* first page, since address is 8k aligned and memory pieces are always
	195	* at least 1MB aligned and have at least a size of 1MB.
	196	*/
a3a9c59a	197	if (kvm_is_error_gpa(vcpu->kvm, irq.u.prefix.address)) {
0744426e	198	*reg &= 0xffffffff00000000UL;
a9ae32c3	199	*reg \|= SIGP_STATUS_INVALID_PARAMETER;
ea1918dd	200	return SIGP_CC_STATUS_STORED;
5288fbf0 CB	201	}
5288fbf0 CB	202
a3a9c59a DH	203	rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
a3a9c59a DH	204	if (rc == -EBUSY) {
0744426e HC	205	*reg &= 0xffffffff00000000UL;
0744426e HC	206	*reg \|= SIGP_STATUS_INCORRECT_STATE;
a3a9c59a	207	return SIGP_CC_STATUS_STORED;
5288fbf0 CB	208	}
5288fbf0 CB	209
5288fbf0 CB	210	return rc;
	211	}
	212
3d95c7d2 DH	213	static int __sigp_store_status_at_addr(struct kvm_vcpu *vcpu,
	214	struct kvm_vcpu *dst_vcpu,
	215	u32 addr, u64 *reg)
00e9e435	216	{
00e9e435 TH	217	int flags;
	218	int rc;
	219
00e9e435	220	flags = atomic_read(dst_vcpu->arch.local_int.cpuflags);
00e9e435 TH	221	if (!(flags & CPUSTAT_STOPPED)) {
	222	*reg &= 0xffffffff00000000UL;
	223	*reg \|= SIGP_STATUS_INCORRECT_STATE;
	224	return SIGP_CC_STATUS_STORED;
	225	}
	226
	227	addr &= 0x7ffffe00;
	228	rc = kvm_s390_store_status_unloaded(dst_vcpu, addr);
	229	if (rc == -EFAULT) {
	230	*reg &= 0xffffffff00000000UL;
	231	*reg \|= SIGP_STATUS_INVALID_PARAMETER;
	232	rc = SIGP_CC_STATUS_STORED;
	233	}
	234	return rc;
	235	}
	236
3d95c7d2 DH	237	static int __sigp_sense_running(struct kvm_vcpu *vcpu,
3d95c7d2 DH	238	struct kvm_vcpu dst_vcpu, u64 reg)
bd59d3a4	239	{
1ee0bc55	240	struct kvm_s390_local_interrupt *li;
bd59d3a4	241	int rc;
bd59d3a4	242
1ee0bc55 JF	243	li = &dst_vcpu->arch.local_int;
	244	if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
	245	/* running */
	246	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
	247	} else {
	248	/* not running */
	249	*reg &= 0xffffffff00000000UL;
	250	*reg \|= SIGP_STATUS_NOT_RUNNING;
	251	rc = SIGP_CC_STATUS_STORED;
bd59d3a4	252	}
bd59d3a4	253
3d95c7d2 DH	254	VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x",
3d95c7d2 DH	255	dst_vcpu->vcpu_id, rc);
bd59d3a4 CH	256
	257	return rc;
	258	}
	259
b8983830 DH	260	static int __prepare_sigp_re_start(struct kvm_vcpu *vcpu,
b8983830 DH	261	struct kvm_vcpu *dst_vcpu, u8 order_code)
151104a7	262	{
3d95c7d2	263	struct kvm_s390_local_interrupt *li = &dst_vcpu->arch.local_int;
b8983830 DH	264	/* handle (RE)START in user space */
b8983830 DH	265	int rc = -EOPNOTSUPP;
151104a7	266
6cddd432	267	/* make sure we don't race with STOP irq injection */
4ae3c081	268	spin_lock(&li->lock);
6cddd432	269	if (kvm_s390_is_stop_irq_pending(dst_vcpu))
ea1918dd	270	rc = SIGP_CC_BUSY;
4ae3c081	271	spin_unlock(&li->lock);
1ee0bc55	272
151104a7 JF	273	return rc;
	274	}
	275
b8983830 DH	276	static int __prepare_sigp_cpu_reset(struct kvm_vcpu *vcpu,
	277	struct kvm_vcpu *dst_vcpu, u8 order_code)
	278	{
	279	/* handle (INITIAL) CPU RESET in user space */
	280	return -EOPNOTSUPP;
	281	}
	282
	283	static int __prepare_sigp_unknown(struct kvm_vcpu *vcpu,
	284	struct kvm_vcpu *dst_vcpu)
	285	{
	286	/* handle unknown orders in user space */
	287	return -EOPNOTSUPP;
	288	}
	289
3526a66b DH	290	static int handle_sigp_dst(struct kvm_vcpu *vcpu, u8 order_code,
3526a66b DH	291	u16 cpu_addr, u32 parameter, u64 *status_reg)
5288fbf0	292	{
5288fbf0	293	int rc;
152e9f65	294	struct kvm_vcpu *dst_vcpu = kvm_get_vcpu_by_id(vcpu->kvm, cpu_addr);
3d95c7d2	295
3d95c7d2 DH	296	if (!dst_vcpu)
3d95c7d2 DH	297	return SIGP_CC_NOT_OPERATIONAL;
5288fbf0	298
5288fbf0 CB	299	switch (order_code) {
	300	case SIGP_SENSE:
	301	vcpu->stat.instruction_sigp_sense++;
3d95c7d2	302	rc = __sigp_sense(vcpu, dst_vcpu, status_reg);
5288fbf0	303	break;
7697e71f CE	304	case SIGP_EXTERNAL_CALL:
7697e71f CE	305	vcpu->stat.instruction_sigp_external_call++;
ea5f4969	306	rc = __sigp_external_call(vcpu, dst_vcpu, status_reg);
7697e71f	307	break;
a9ae32c3	308	case SIGP_EMERGENCY_SIGNAL:
5288fbf0	309	vcpu->stat.instruction_sigp_emergency++;
3d95c7d2	310	rc = __sigp_emergency(vcpu, dst_vcpu);
5288fbf0 CB	311	break;
	312	case SIGP_STOP:
	313	vcpu->stat.instruction_sigp_stop++;
a6cc3108	314	rc = __sigp_stop(vcpu, dst_vcpu);
5288fbf0	315	break;
a9ae32c3	316	case SIGP_STOP_AND_STORE_STATUS:
42cb0c9f	317	vcpu->stat.instruction_sigp_stop_store_status++;
a6cc3108	318	rc = __sigp_stop_and_store_status(vcpu, dst_vcpu, status_reg);
5288fbf0	319	break;
00e9e435	320	case SIGP_STORE_STATUS_AT_ADDRESS:
42cb0c9f	321	vcpu->stat.instruction_sigp_store_status++;
3d95c7d2	322	rc = __sigp_store_status_at_addr(vcpu, dst_vcpu, parameter,
3526a66b	323	status_reg);
5288fbf0 CB	324	break;
	325	case SIGP_SET_PREFIX:
	326	vcpu->stat.instruction_sigp_prefix++;
3d95c7d2	327	rc = __sigp_set_prefix(vcpu, dst_vcpu, parameter, status_reg);
5288fbf0	328	break;
b13d3580	329	case SIGP_COND_EMERGENCY_SIGNAL:
42cb0c9f	330	vcpu->stat.instruction_sigp_cond_emergency++;
3d95c7d2	331	rc = __sigp_conditional_emergency(vcpu, dst_vcpu, parameter,
3526a66b	332	status_reg);
b13d3580	333	break;
bd59d3a4 CH	334	case SIGP_SENSE_RUNNING:
bd59d3a4 CH	335	vcpu->stat.instruction_sigp_sense_running++;
3d95c7d2	336	rc = __sigp_sense_running(vcpu, dst_vcpu, status_reg);
bd59d3a4	337	break;
58bc33b2	338	case SIGP_START:
42cb0c9f	339	vcpu->stat.instruction_sigp_start++;
b8983830	340	rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
58bc33b2	341	break;
5288fbf0 CB	342	case SIGP_RESTART:
5288fbf0 CB	343	vcpu->stat.instruction_sigp_restart++;
b8983830 DH	344	rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
	345	break;
	346	case SIGP_INITIAL_CPU_RESET:
42cb0c9f	347	vcpu->stat.instruction_sigp_init_cpu_reset++;
b8983830 DH	348	rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
	349	break;
	350	case SIGP_CPU_RESET:
42cb0c9f	351	vcpu->stat.instruction_sigp_cpu_reset++;
b8983830	352	rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
cc92d6de	353	break;
5288fbf0	354	default:
42cb0c9f	355	vcpu->stat.instruction_sigp_unknown++;
b8983830	356	rc = __prepare_sigp_unknown(vcpu, dst_vcpu);
3526a66b DH	357	}
3526a66b DH	358
b8983830 DH	359	if (rc == -EOPNOTSUPP)
	360	VCPU_EVENT(vcpu, 4,
	361	"sigp order %u -> cpu %x: handled in user space",
	362	order_code, dst_vcpu->vcpu_id);
	363
3526a66b DH	364	return rc;
	365	}
	366
7cbde76b CB	367	static int handle_sigp_order_in_user_space(struct kvm_vcpu *vcpu, u8 order_code,
7cbde76b CB	368	u16 cpu_addr)
2444b352 DH	369	{
	370	if (!vcpu->kvm->arch.user_sigp)
	371	return 0;
	372
	373	switch (order_code) {
	374	case SIGP_SENSE:
	375	case SIGP_EXTERNAL_CALL:
	376	case SIGP_EMERGENCY_SIGNAL:
	377	case SIGP_COND_EMERGENCY_SIGNAL:
	378	case SIGP_SENSE_RUNNING:
	379	return 0;
	380	/* update counters as we're directly dropping to user space */
	381	case SIGP_STOP:
	382	vcpu->stat.instruction_sigp_stop++;
	383	break;
	384	case SIGP_STOP_AND_STORE_STATUS:
	385	vcpu->stat.instruction_sigp_stop_store_status++;
	386	break;
	387	case SIGP_STORE_STATUS_AT_ADDRESS:
	388	vcpu->stat.instruction_sigp_store_status++;
	389	break;
cd7b4b61 EF	390	case SIGP_STORE_ADDITIONAL_STATUS:
	391	vcpu->stat.instruction_sigp_store_adtl_status++;
	392	break;
2444b352 DH	393	case SIGP_SET_PREFIX:
	394	vcpu->stat.instruction_sigp_prefix++;
	395	break;
	396	case SIGP_START:
	397	vcpu->stat.instruction_sigp_start++;
	398	break;
	399	case SIGP_RESTART:
	400	vcpu->stat.instruction_sigp_restart++;
	401	break;
	402	case SIGP_INITIAL_CPU_RESET:
	403	vcpu->stat.instruction_sigp_init_cpu_reset++;
	404	break;
	405	case SIGP_CPU_RESET:
	406	vcpu->stat.instruction_sigp_cpu_reset++;
	407	break;
	408	default:
	409	vcpu->stat.instruction_sigp_unknown++;
	410	}
7cbde76b CB	411	VCPU_EVENT(vcpu, 3, "SIGP: order %u for CPU %d handled in userspace",
7cbde76b CB	412	order_code, cpu_addr);
2444b352 DH	413
	414	return 1;
	415	}
	416
3526a66b DH	417	int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
	418	{
	419	int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
	420	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
	421	u32 parameter;
	422	u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
	423	u8 order_code;
	424	int rc;
	425
	426	/* sigp in userspace can exit */
	427	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
	428	return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
	429
8ae04b8f	430	order_code = kvm_s390_get_base_disp_rs(vcpu, NULL);
7cbde76b	431	if (handle_sigp_order_in_user_space(vcpu, order_code, cpu_addr))
2444b352	432	return -EOPNOTSUPP;
3526a66b DH	433
	434	if (r1 % 2)
	435	parameter = vcpu->run->s.regs.gprs[r1];
	436	else
	437	parameter = vcpu->run->s.regs.gprs[r1 + 1];
	438
	439	trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter);
	440	switch (order_code) {
	441	case SIGP_SET_ARCHITECTURE:
	442	vcpu->stat.instruction_sigp_arch++;
	443	rc = __sigp_set_arch(vcpu, parameter);
	444	break;
	445	default:
	446	rc = handle_sigp_dst(vcpu, order_code, cpu_addr,
	447	parameter,
	448	&vcpu->run->s.regs.gprs[r1]);
5288fbf0 CB	449	}
	450
	451	if (rc < 0)
	452	return rc;
	453
949c007a	454	kvm_s390_set_psw_cc(vcpu, rc);
5288fbf0 CB	455	return 0;
5288fbf0 CB	456	}
4953919f DH	457
	458	/*
	459	* Handle SIGP partial execution interception.
	460	*
	461	* This interception will occur at the source cpu when a source cpu sends an
	462	* external call to a target cpu and the target cpu has the WAIT bit set in
	463	* its cpuflags. Interception will occurr after the interrupt indicator bits at
	464	* the target cpu have been set. All error cases will lead to instruction
	465	* interception, therefore nothing is to be checked or prepared.
	466	*/
	467	int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu)
	468	{
	469	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
	470	u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
	471	struct kvm_vcpu *dest_vcpu;
8ae04b8f	472	u8 order_code = kvm_s390_get_base_disp_rs(vcpu, NULL);
4953919f DH	473
	474	trace_kvm_s390_handle_sigp_pei(vcpu, order_code, cpu_addr);
	475
	476	if (order_code == SIGP_EXTERNAL_CALL) {
152e9f65	477	dest_vcpu = kvm_get_vcpu_by_id(vcpu->kvm, cpu_addr);
4953919f DH	478	BUG_ON(dest_vcpu == NULL);
4953919f DH	479
0e9c85a5	480	kvm_s390_vcpu_wakeup(dest_vcpu);
4953919f DH	481	kvm_s390_set_psw_cc(vcpu, SIGP_CC_ORDER_CODE_ACCEPTED);
	482	return 0;
	483	}
	484
	485	return -EOPNOTSUPP;
	486	}