[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;
	} 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, 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)
{
	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_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, 4, "sigp order %u: completely handled in user space",
		   order_code);

	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);
	if (handle_sigp_order_in_user_space(vcpu, order_code))
		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);

	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	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 DH	207	return SIGP_CC_STATUS_STORED;
	208	} else if (rc == 0) {
	209	VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x",
	210	dst_vcpu->vcpu_id, irq.u.prefix.address);
5288fbf0 CB	211	}
5288fbf0 CB	212
5288fbf0 CB	213	return rc;
	214	}
	215
3d95c7d2 DH	216	static int __sigp_store_status_at_addr(struct kvm_vcpu *vcpu,
	217	struct kvm_vcpu *dst_vcpu,
	218	u32 addr, u64 *reg)
00e9e435	219	{
00e9e435 TH	220	int flags;
	221	int rc;
	222
00e9e435	223	flags = atomic_read(dst_vcpu->arch.local_int.cpuflags);
00e9e435 TH	224	if (!(flags & CPUSTAT_STOPPED)) {
	225	*reg &= 0xffffffff00000000UL;
	226	*reg \|= SIGP_STATUS_INCORRECT_STATE;
	227	return SIGP_CC_STATUS_STORED;
	228	}
	229
	230	addr &= 0x7ffffe00;
	231	rc = kvm_s390_store_status_unloaded(dst_vcpu, addr);
	232	if (rc == -EFAULT) {
	233	*reg &= 0xffffffff00000000UL;
	234	*reg \|= SIGP_STATUS_INVALID_PARAMETER;
	235	rc = SIGP_CC_STATUS_STORED;
	236	}
	237	return rc;
	238	}
	239
3d95c7d2 DH	240	static int __sigp_sense_running(struct kvm_vcpu *vcpu,
3d95c7d2 DH	241	struct kvm_vcpu dst_vcpu, u64 reg)
bd59d3a4	242	{
1ee0bc55	243	struct kvm_s390_local_interrupt *li;
bd59d3a4	244	int rc;
bd59d3a4	245
1ee0bc55 JF	246	li = &dst_vcpu->arch.local_int;
	247	if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
	248	/* running */
	249	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
	250	} else {
	251	/* not running */
	252	*reg &= 0xffffffff00000000UL;
	253	*reg \|= SIGP_STATUS_NOT_RUNNING;
	254	rc = SIGP_CC_STATUS_STORED;
bd59d3a4	255	}
bd59d3a4	256
3d95c7d2 DH	257	VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x",
3d95c7d2 DH	258	dst_vcpu->vcpu_id, rc);
bd59d3a4 CH	259
	260	return rc;
	261	}
	262
b8983830 DH	263	static int __prepare_sigp_re_start(struct kvm_vcpu *vcpu,
b8983830 DH	264	struct kvm_vcpu *dst_vcpu, u8 order_code)
151104a7	265	{
3d95c7d2	266	struct kvm_s390_local_interrupt *li = &dst_vcpu->arch.local_int;
b8983830 DH	267	/* handle (RE)START in user space */
b8983830 DH	268	int rc = -EOPNOTSUPP;
151104a7	269
6cddd432	270	/* make sure we don't race with STOP irq injection */
4ae3c081	271	spin_lock(&li->lock);
6cddd432	272	if (kvm_s390_is_stop_irq_pending(dst_vcpu))
ea1918dd	273	rc = SIGP_CC_BUSY;
4ae3c081	274	spin_unlock(&li->lock);
1ee0bc55	275
151104a7 JF	276	return rc;
	277	}
	278
b8983830 DH	279	static int __prepare_sigp_cpu_reset(struct kvm_vcpu *vcpu,
	280	struct kvm_vcpu *dst_vcpu, u8 order_code)
	281	{
	282	/* handle (INITIAL) CPU RESET in user space */
	283	return -EOPNOTSUPP;
	284	}
	285
	286	static int __prepare_sigp_unknown(struct kvm_vcpu *vcpu,
	287	struct kvm_vcpu *dst_vcpu)
	288	{
	289	/* handle unknown orders in user space */
	290	return -EOPNOTSUPP;
	291	}
	292
3526a66b DH	293	static int handle_sigp_dst(struct kvm_vcpu *vcpu, u8 order_code,
3526a66b DH	294	u16 cpu_addr, u32 parameter, u64 *status_reg)
5288fbf0	295	{
5288fbf0	296	int rc;
3d95c7d2 DH	297	struct kvm_vcpu *dst_vcpu;
	298
	299	if (cpu_addr >= KVM_MAX_VCPUS)
	300	return SIGP_CC_NOT_OPERATIONAL;
	301
	302	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	303	if (!dst_vcpu)
	304	return SIGP_CC_NOT_OPERATIONAL;
5288fbf0	305
5288fbf0 CB	306	switch (order_code) {
	307	case SIGP_SENSE:
	308	vcpu->stat.instruction_sigp_sense++;
3d95c7d2	309	rc = __sigp_sense(vcpu, dst_vcpu, status_reg);
5288fbf0	310	break;
7697e71f CE	311	case SIGP_EXTERNAL_CALL:
7697e71f CE	312	vcpu->stat.instruction_sigp_external_call++;
ea5f4969	313	rc = __sigp_external_call(vcpu, dst_vcpu, status_reg);
7697e71f	314	break;
a9ae32c3	315	case SIGP_EMERGENCY_SIGNAL:
5288fbf0	316	vcpu->stat.instruction_sigp_emergency++;
3d95c7d2	317	rc = __sigp_emergency(vcpu, dst_vcpu);
5288fbf0 CB	318	break;
	319	case SIGP_STOP:
	320	vcpu->stat.instruction_sigp_stop++;
a6cc3108	321	rc = __sigp_stop(vcpu, dst_vcpu);
5288fbf0	322	break;
a9ae32c3	323	case SIGP_STOP_AND_STORE_STATUS:
42cb0c9f	324	vcpu->stat.instruction_sigp_stop_store_status++;
a6cc3108	325	rc = __sigp_stop_and_store_status(vcpu, dst_vcpu, status_reg);
5288fbf0	326	break;
00e9e435	327	case SIGP_STORE_STATUS_AT_ADDRESS:
42cb0c9f	328	vcpu->stat.instruction_sigp_store_status++;
3d95c7d2	329	rc = __sigp_store_status_at_addr(vcpu, dst_vcpu, parameter,
3526a66b	330	status_reg);
5288fbf0 CB	331	break;
	332	case SIGP_SET_PREFIX:
	333	vcpu->stat.instruction_sigp_prefix++;
3d95c7d2	334	rc = __sigp_set_prefix(vcpu, dst_vcpu, parameter, status_reg);
5288fbf0	335	break;
b13d3580	336	case SIGP_COND_EMERGENCY_SIGNAL:
42cb0c9f	337	vcpu->stat.instruction_sigp_cond_emergency++;
3d95c7d2	338	rc = __sigp_conditional_emergency(vcpu, dst_vcpu, parameter,
3526a66b	339	status_reg);
b13d3580	340	break;
bd59d3a4 CH	341	case SIGP_SENSE_RUNNING:
bd59d3a4 CH	342	vcpu->stat.instruction_sigp_sense_running++;
3d95c7d2	343	rc = __sigp_sense_running(vcpu, dst_vcpu, status_reg);
bd59d3a4	344	break;
58bc33b2	345	case SIGP_START:
42cb0c9f	346	vcpu->stat.instruction_sigp_start++;
b8983830	347	rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
58bc33b2	348	break;
5288fbf0 CB	349	case SIGP_RESTART:
5288fbf0 CB	350	vcpu->stat.instruction_sigp_restart++;
b8983830 DH	351	rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
	352	break;
	353	case SIGP_INITIAL_CPU_RESET:
42cb0c9f	354	vcpu->stat.instruction_sigp_init_cpu_reset++;
b8983830 DH	355	rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
	356	break;
	357	case SIGP_CPU_RESET:
42cb0c9f	358	vcpu->stat.instruction_sigp_cpu_reset++;
b8983830	359	rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
cc92d6de	360	break;
5288fbf0	361	default:
42cb0c9f	362	vcpu->stat.instruction_sigp_unknown++;
b8983830	363	rc = __prepare_sigp_unknown(vcpu, dst_vcpu);
3526a66b DH	364	}
3526a66b DH	365
b8983830 DH	366	if (rc == -EOPNOTSUPP)
	367	VCPU_EVENT(vcpu, 4,
	368	"sigp order %u -> cpu %x: handled in user space",
	369	order_code, dst_vcpu->vcpu_id);
	370
3526a66b DH	371	return rc;
	372	}
	373
2444b352 DH	374	static int handle_sigp_order_in_user_space(struct kvm_vcpu *vcpu, u8 order_code)
	375	{
	376	if (!vcpu->kvm->arch.user_sigp)
	377	return 0;
	378
	379	switch (order_code) {
	380	case SIGP_SENSE:
	381	case SIGP_EXTERNAL_CALL:
	382	case SIGP_EMERGENCY_SIGNAL:
	383	case SIGP_COND_EMERGENCY_SIGNAL:
	384	case SIGP_SENSE_RUNNING:
	385	return 0;
	386	/* update counters as we're directly dropping to user space */
	387	case SIGP_STOP:
	388	vcpu->stat.instruction_sigp_stop++;
	389	break;
	390	case SIGP_STOP_AND_STORE_STATUS:
	391	vcpu->stat.instruction_sigp_stop_store_status++;
	392	break;
	393	case SIGP_STORE_STATUS_AT_ADDRESS:
	394	vcpu->stat.instruction_sigp_store_status++;
	395	break;
	396	case SIGP_SET_PREFIX:
	397	vcpu->stat.instruction_sigp_prefix++;
	398	break;
	399	case SIGP_START:
	400	vcpu->stat.instruction_sigp_start++;
	401	break;
	402	case SIGP_RESTART:
	403	vcpu->stat.instruction_sigp_restart++;
	404	break;
	405	case SIGP_INITIAL_CPU_RESET:
	406	vcpu->stat.instruction_sigp_init_cpu_reset++;
	407	break;
	408	case SIGP_CPU_RESET:
	409	vcpu->stat.instruction_sigp_cpu_reset++;
	410	break;
	411	default:
	412	vcpu->stat.instruction_sigp_unknown++;
	413	}
	414
	415	VCPU_EVENT(vcpu, 4, "sigp order %u: completely handled in user space",
	416	order_code);
	417
	418	return 1;
	419	}
	420
3526a66b DH	421	int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
	422	{
	423	int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
	424	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
	425	u32 parameter;
	426	u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
	427	u8 order_code;
	428	int rc;
	429
	430	/* sigp in userspace can exit */
	431	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
	432	return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
	433
	434	order_code = kvm_s390_get_base_disp_rs(vcpu);
2444b352 DH	435	if (handle_sigp_order_in_user_space(vcpu, order_code))
2444b352 DH	436	return -EOPNOTSUPP;
3526a66b DH	437
	438	if (r1 % 2)
	439	parameter = vcpu->run->s.regs.gprs[r1];
	440	else
	441	parameter = vcpu->run->s.regs.gprs[r1 + 1];
	442
	443	trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter);
	444	switch (order_code) {
	445	case SIGP_SET_ARCHITECTURE:
	446	vcpu->stat.instruction_sigp_arch++;
	447	rc = __sigp_set_arch(vcpu, parameter);
	448	break;
	449	default:
	450	rc = handle_sigp_dst(vcpu, order_code, cpu_addr,
	451	parameter,
	452	&vcpu->run->s.regs.gprs[r1]);
5288fbf0 CB	453	}
	454
	455	if (rc < 0)
	456	return rc;
	457
949c007a	458	kvm_s390_set_psw_cc(vcpu, rc);
5288fbf0 CB	459	return 0;
5288fbf0 CB	460	}
4953919f DH	461
	462	/*
	463	* Handle SIGP partial execution interception.
	464	*
	465	* This interception will occur at the source cpu when a source cpu sends an
	466	* external call to a target cpu and the target cpu has the WAIT bit set in
	467	* its cpuflags. Interception will occurr after the interrupt indicator bits at
	468	* the target cpu have been set. All error cases will lead to instruction
	469	* interception, therefore nothing is to be checked or prepared.
	470	*/
	471	int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu)
	472	{
	473	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
	474	u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
	475	struct kvm_vcpu *dest_vcpu;
	476	u8 order_code = kvm_s390_get_base_disp_rs(vcpu);
	477
	478	trace_kvm_s390_handle_sigp_pei(vcpu, order_code, cpu_addr);
	479
	480	if (order_code == SIGP_EXTERNAL_CALL) {
	481	dest_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	482	BUG_ON(dest_vcpu == NULL);
	483
0e9c85a5	484	kvm_s390_vcpu_wakeup(dest_vcpu);
4953919f DH	485	kvm_s390_set_psw_cc(vcpu, SIGP_CC_ORDER_CODE_ACCEPTED);
	486	return 0;
	487	}
	488
	489	return -EOPNOTSUPP;
	490	}