[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;

	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", 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)
{
	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)
		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;
	} else if (rc == 0) {
		VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x",
			   dst_vcpu->vcpu_id, irq.u.prefix.address);
	}

	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;

	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;

	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);
		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;
}

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
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 CB	28	int rc;
5288fbf0 CB	29
1ee0bc55 JF	30	li = &dst_vcpu->arch.local_int;
	31
	32	cpuflags = atomic_read(li->cpuflags);
	33	if (!(cpuflags & (CPUSTAT_ECALL_PEND \| CPUSTAT_STOPPED)))
21b26c08 CH	34	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
21b26c08 CH	35	else {
5288fbf0	36	*reg &= 0xffffffff00000000UL;
1ee0bc55	37	if (cpuflags & CPUSTAT_ECALL_PEND)
21b26c08	38	*reg \|= SIGP_STATUS_EXT_CALL_PENDING;
1ee0bc55	39	if (cpuflags & CPUSTAT_STOPPED)
21b26c08	40	*reg \|= SIGP_STATUS_STOPPED;
ea1918dd	41	rc = SIGP_CC_STATUS_STORED;
5288fbf0	42	}
5288fbf0	43
3d95c7d2 DH	44	VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", dst_vcpu->vcpu_id,
3d95c7d2 DH	45	rc);
5288fbf0 CB	46	return rc;
	47	}
	48
07b03035 DH	49	static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
07b03035 DH	50	struct kvm_vcpu *dst_vcpu)
5288fbf0	51	{
383d0b05	52	struct kvm_s390_irq irq = {
22ff4a33	53	.type = KVM_S390_INT_EMERGENCY,
383d0b05	54	.u.emerg.code = vcpu->vcpu_id,
22ff4a33	55	};
22ff4a33	56	int rc = 0;
5288fbf0	57
383d0b05	58	rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
22ff4a33	59	if (!rc)
3d95c7d2 DH	60	VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x",
3d95c7d2 DH	61	dst_vcpu->vcpu_id);
5288fbf0	62
22ff4a33	63	return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
7697e71f CE	64	}
7697e71f CE	65
07b03035 DH	66	static int __sigp_emergency(struct kvm_vcpu vcpu, struct kvm_vcpu dst_vcpu)
	67	{
	68	return __inject_sigp_emergency(vcpu, dst_vcpu);
	69	}
	70
3d95c7d2 DH	71	static int __sigp_conditional_emergency(struct kvm_vcpu *vcpu,
3d95c7d2 DH	72	struct kvm_vcpu *dst_vcpu,
b13d3580 TH	73	u16 asn, u64 *reg)
b13d3580 TH	74	{
b13d3580 TH	75	const u64 psw_int_mask = PSW_MASK_IO \| PSW_MASK_EXT;
	76	u16 p_asn, s_asn;
	77	psw_t *psw;
	78	u32 flags;
	79
b13d3580 TH	80	flags = atomic_read(&dst_vcpu->arch.sie_block->cpuflags);
	81	psw = &dst_vcpu->arch.sie_block->gpsw;
	82	p_asn = dst_vcpu->arch.sie_block->gcr[4] & 0xffff; /* Primary ASN */
	83	s_asn = dst_vcpu->arch.sie_block->gcr[3] & 0xffff; /* Secondary ASN */
	84
07b03035	85	/* Inject the emergency signal? */
b13d3580 TH	86	if (!(flags & CPUSTAT_STOPPED)
	87	\|\| (psw->mask & psw_int_mask) != psw_int_mask
	88	\|\| ((flags & CPUSTAT_WAIT) && psw->addr != 0)
	89	\|\| (!(flags & CPUSTAT_WAIT) && (asn == p_asn \|\| asn == s_asn))) {
07b03035	90	return __inject_sigp_emergency(vcpu, dst_vcpu);
b13d3580 TH	91	} else {
	92	*reg &= 0xffffffff00000000UL;
	93	*reg \|= SIGP_STATUS_INCORRECT_STATE;
	94	return SIGP_CC_STATUS_STORED;
	95	}
	96	}
	97
3d95c7d2 DH	98	static int __sigp_external_call(struct kvm_vcpu *vcpu,
3d95c7d2 DH	99	struct kvm_vcpu *dst_vcpu)
7697e71f	100	{
383d0b05	101	struct kvm_s390_irq irq = {
22ff4a33	102	.type = KVM_S390_INT_EXTERNAL_CALL,
383d0b05	103	.u.extcall.code = vcpu->vcpu_id,
22ff4a33	104	};
22ff4a33	105	int rc;
7697e71f	106
383d0b05	107	rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
22ff4a33	108	if (!rc)
3d95c7d2 DH	109	VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x",
3d95c7d2 DH	110	dst_vcpu->vcpu_id);
7697e71f	111
22ff4a33	112	return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0 CB	113	}
5288fbf0 CB	114
a6cc3108	115	static int __sigp_stop(struct kvm_vcpu vcpu, struct kvm_vcpu dst_vcpu)
9ace903d	116	{
6cddd432 DH	117	struct kvm_s390_irq irq = {
	118	.type = KVM_S390_SIGP_STOP,
	119	};
9ace903d CE	120	int rc;
9ace903d CE	121
6cddd432 DH	122	rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
	123	if (rc == -EBUSY)
	124	rc = SIGP_CC_BUSY;
	125	else if (rc == 0)
	126	VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x",
	127	dst_vcpu->vcpu_id);
e879892c	128
a6cc3108 DH	129	return rc;
	130	}
	131
	132	static int __sigp_stop_and_store_status(struct kvm_vcpu *vcpu,
	133	struct kvm_vcpu dst_vcpu, u64 reg)
	134	{
6cddd432 DH	135	struct kvm_s390_irq irq = {
	136	.type = KVM_S390_SIGP_STOP,
	137	.u.stop.flags = KVM_S390_STOP_FLAG_STORE_STATUS,
	138	};
a6cc3108 DH	139	int rc;
a6cc3108 DH	140
6cddd432 DH	141	rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
	142	if (rc == -EBUSY)
	143	rc = SIGP_CC_BUSY;
	144	else if (rc == 0)
	145	VCPU_EVENT(vcpu, 4, "sent sigp stop and store status to cpu %x",
	146	dst_vcpu->vcpu_id);
e879892c	147
5288fbf0 CB	148	return rc;
	149	}
	150
	151	static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
	152	{
	153	int rc;
3c038e6b DD	154	unsigned int i;
3c038e6b DD	155	struct kvm_vcpu *v;
5288fbf0 CB	156
	157	switch (parameter & 0xff) {
	158	case 0:
ea1918dd	159	rc = SIGP_CC_NOT_OPERATIONAL;
5288fbf0 CB	160	break;
	161	case 1:
	162	case 2:
3c038e6b DD	163	kvm_for_each_vcpu(i, v, vcpu->kvm) {
	164	v->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
	165	kvm_clear_async_pf_completion_queue(v);
	166	}
	167
ea1918dd	168	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0 CB	169	break;
5288fbf0 CB	170	default:
b8e660b8	171	rc = -EOPNOTSUPP;
5288fbf0 CB	172	}
	173	return rc;
	174	}
	175
3d95c7d2 DH	176	static int __sigp_set_prefix(struct kvm_vcpu vcpu, struct kvm_vcpu dst_vcpu,
3d95c7d2 DH	177	u32 address, u64 *reg)
5288fbf0	178	{
a3a9c59a DH	179	struct kvm_s390_irq irq = {
	180	.type = KVM_S390_SIGP_SET_PREFIX,
	181	.u.prefix.address = address & 0x7fffe000u,
	182	};
5288fbf0	183	int rc;
5288fbf0	184
665170cb HC	185	/*
	186	* Make sure the new value is valid memory. We only need to check the
	187	* first page, since address is 8k aligned and memory pieces are always
	188	* at least 1MB aligned and have at least a size of 1MB.
	189	*/
a3a9c59a	190	if (kvm_is_error_gpa(vcpu->kvm, irq.u.prefix.address)) {
0744426e	191	*reg &= 0xffffffff00000000UL;
a9ae32c3	192	*reg \|= SIGP_STATUS_INVALID_PARAMETER;
ea1918dd	193	return SIGP_CC_STATUS_STORED;
5288fbf0 CB	194	}
5288fbf0 CB	195
a3a9c59a DH	196	rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
a3a9c59a DH	197	if (rc == -EBUSY) {
0744426e HC	198	*reg &= 0xffffffff00000000UL;
0744426e HC	199	*reg \|= SIGP_STATUS_INCORRECT_STATE;
a3a9c59a DH	200	return SIGP_CC_STATUS_STORED;
	201	} else if (rc == 0) {
	202	VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x",
	203	dst_vcpu->vcpu_id, irq.u.prefix.address);
5288fbf0 CB	204	}
5288fbf0 CB	205
5288fbf0 CB	206	return rc;
	207	}
	208
3d95c7d2 DH	209	static int __sigp_store_status_at_addr(struct kvm_vcpu *vcpu,
	210	struct kvm_vcpu *dst_vcpu,
	211	u32 addr, u64 *reg)
00e9e435	212	{
00e9e435 TH	213	int flags;
	214	int rc;
	215
00e9e435	216	flags = atomic_read(dst_vcpu->arch.local_int.cpuflags);
00e9e435 TH	217	if (!(flags & CPUSTAT_STOPPED)) {
	218	*reg &= 0xffffffff00000000UL;
	219	*reg \|= SIGP_STATUS_INCORRECT_STATE;
	220	return SIGP_CC_STATUS_STORED;
	221	}
	222
	223	addr &= 0x7ffffe00;
	224	rc = kvm_s390_store_status_unloaded(dst_vcpu, addr);
	225	if (rc == -EFAULT) {
	226	*reg &= 0xffffffff00000000UL;
	227	*reg \|= SIGP_STATUS_INVALID_PARAMETER;
	228	rc = SIGP_CC_STATUS_STORED;
	229	}
	230	return rc;
	231	}
	232
3d95c7d2 DH	233	static int __sigp_sense_running(struct kvm_vcpu *vcpu,
3d95c7d2 DH	234	struct kvm_vcpu dst_vcpu, u64 reg)
bd59d3a4	235	{
1ee0bc55	236	struct kvm_s390_local_interrupt *li;
bd59d3a4	237	int rc;
bd59d3a4	238
1ee0bc55 JF	239	li = &dst_vcpu->arch.local_int;
	240	if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
	241	/* running */
	242	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
	243	} else {
	244	/* not running */
	245	*reg &= 0xffffffff00000000UL;
	246	*reg \|= SIGP_STATUS_NOT_RUNNING;
	247	rc = SIGP_CC_STATUS_STORED;
bd59d3a4	248	}
bd59d3a4	249
3d95c7d2 DH	250	VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x",
3d95c7d2 DH	251	dst_vcpu->vcpu_id, rc);
bd59d3a4 CH	252
	253	return rc;
	254	}
	255
b8983830 DH	256	static int __prepare_sigp_re_start(struct kvm_vcpu *vcpu,
b8983830 DH	257	struct kvm_vcpu *dst_vcpu, u8 order_code)
151104a7	258	{
3d95c7d2	259	struct kvm_s390_local_interrupt *li = &dst_vcpu->arch.local_int;
b8983830 DH	260	/* handle (RE)START in user space */
b8983830 DH	261	int rc = -EOPNOTSUPP;
151104a7	262
6cddd432	263	/* make sure we don't race with STOP irq injection */
4ae3c081	264	spin_lock(&li->lock);
6cddd432	265	if (kvm_s390_is_stop_irq_pending(dst_vcpu))
ea1918dd	266	rc = SIGP_CC_BUSY;
4ae3c081	267	spin_unlock(&li->lock);
1ee0bc55	268
151104a7 JF	269	return rc;
	270	}
	271
b8983830 DH	272	static int __prepare_sigp_cpu_reset(struct kvm_vcpu *vcpu,
	273	struct kvm_vcpu *dst_vcpu, u8 order_code)
	274	{
	275	/* handle (INITIAL) CPU RESET in user space */
	276	return -EOPNOTSUPP;
	277	}
	278
	279	static int __prepare_sigp_unknown(struct kvm_vcpu *vcpu,
	280	struct kvm_vcpu *dst_vcpu)
	281	{
	282	/* handle unknown orders in user space */
	283	return -EOPNOTSUPP;
	284	}
	285
3526a66b DH	286	static int handle_sigp_dst(struct kvm_vcpu *vcpu, u8 order_code,
3526a66b DH	287	u16 cpu_addr, u32 parameter, u64 *status_reg)
5288fbf0	288	{
5288fbf0	289	int rc;
3d95c7d2 DH	290	struct kvm_vcpu *dst_vcpu;
	291
	292	if (cpu_addr >= KVM_MAX_VCPUS)
	293	return SIGP_CC_NOT_OPERATIONAL;
	294
	295	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	296	if (!dst_vcpu)
	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++;
3d95c7d2	306	rc = __sigp_external_call(vcpu, dst_vcpu);
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
	367	int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
	368	{
	369	int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
	370	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
	371	u32 parameter;
	372	u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
	373	u8 order_code;
	374	int rc;
	375
	376	/* sigp in userspace can exit */
	377	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
	378	return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
	379
	380	order_code = kvm_s390_get_base_disp_rs(vcpu);
	381
	382	if (r1 % 2)
	383	parameter = vcpu->run->s.regs.gprs[r1];
	384	else
	385	parameter = vcpu->run->s.regs.gprs[r1 + 1];
	386
	387	trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter);
	388	switch (order_code) {
	389	case SIGP_SET_ARCHITECTURE:
	390	vcpu->stat.instruction_sigp_arch++;
	391	rc = __sigp_set_arch(vcpu, parameter);
	392	break;
	393	default:
	394	rc = handle_sigp_dst(vcpu, order_code, cpu_addr,
	395	parameter,
	396	&vcpu->run->s.regs.gprs[r1]);
5288fbf0 CB	397	}
	398
	399	if (rc < 0)
	400	return rc;
	401
949c007a	402	kvm_s390_set_psw_cc(vcpu, rc);
5288fbf0 CB	403	return 0;
5288fbf0 CB	404	}
4953919f DH	405
	406	/*
	407	* Handle SIGP partial execution interception.
	408	*
	409	* This interception will occur at the source cpu when a source cpu sends an
	410	* external call to a target cpu and the target cpu has the WAIT bit set in
	411	* its cpuflags. Interception will occurr after the interrupt indicator bits at
	412	* the target cpu have been set. All error cases will lead to instruction
	413	* interception, therefore nothing is to be checked or prepared.
	414	*/
	415	int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu)
	416	{
	417	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
	418	u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
	419	struct kvm_vcpu *dest_vcpu;
	420	u8 order_code = kvm_s390_get_base_disp_rs(vcpu);
	421
	422	trace_kvm_s390_handle_sigp_pei(vcpu, order_code, cpu_addr);
	423
	424	if (order_code == SIGP_EXTERNAL_CALL) {
	425	dest_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	426	BUG_ON(dest_vcpu == NULL);
	427
0e9c85a5	428	kvm_s390_vcpu_wakeup(dest_vcpu);
4953919f DH	429	kvm_s390_set_psw_cc(vcpu, SIGP_CC_ORDER_CODE_ACCEPTED);
	430	return 0;
	431	}
	432
	433	return -EOPNOTSUPP;
	434	}