[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_local_interrupt *li;
	struct kvm_s390_interrupt_info *inti;
	struct kvm_vcpu *dst_vcpu = NULL;

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

	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	if (!inti)
		return -ENOMEM;

	inti->type = KVM_S390_INT_EMERGENCY;
	inti->emerg.code = vcpu->vcpu_id;

	li = &dst_vcpu->arch.local_int;
	spin_lock_bh(&li->lock);
	list_add_tail(&inti->list, &li->list);
	atomic_set(&li->active, 1);
	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	if (waitqueue_active(li->wq))
		wake_up_interruptible(li->wq);
	spin_unlock_bh(&li->lock);
	VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);

	return 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_local_interrupt *li;
	struct kvm_s390_interrupt_info *inti;
	struct kvm_vcpu *dst_vcpu = NULL;

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

	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	if (!inti)
		return -ENOMEM;

	inti->type = KVM_S390_INT_EXTERNAL_CALL;
	inti->extcall.code = vcpu->vcpu_id;

	li = &dst_vcpu->arch.local_int;
	spin_lock_bh(&li->lock);
	list_add_tail(&inti->list, &li->list);
	atomic_set(&li->active, 1);
	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
	if (waitqueue_active(li->wq))
		wake_up_interruptible(li->wq);
	spin_unlock_bh(&li->lock);
	VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x", cpu_addr);

	return SIGP_CC_ORDER_CODE_ACCEPTED;
}

static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action)
{
	struct kvm_s390_interrupt_info *inti;
	int rc = SIGP_CC_ORDER_CODE_ACCEPTED;

	inti = kzalloc(sizeof(*inti), GFP_ATOMIC);
	if (!inti)
		return -ENOMEM;
	inti->type = KVM_S390_SIGP_STOP;

	spin_lock_bh(&li->lock);
	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);
	atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
	li->action_bits |= action;
	if (waitqueue_active(li->wq))
		wake_up_interruptible(li->wq);
out:
	spin_unlock_bh(&li->lock);

	return rc;
}

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

	if (cpu_addr >= KVM_MAX_VCPUS)
		return SIGP_CC_NOT_OPERATIONAL;

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

	rc = __inject_sigp_stop(li, action);

	VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);

	if ((action & ACTION_STORE_ON_STOP) != 0 && rc == -ESHUTDOWN) {
		/* If the CPU has already been stopped, we still have
		 * to save the status when doing stop-and-store. This
		 * has to be done after unlocking all spinlocks. */
		rc = kvm_s390_store_status_unloaded(dst_vcpu,
						KVM_S390_STORE_STATUS_NOADDR);
	}

	return rc;
}

static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
{
	int rc;
	unsigned int i;
	struct kvm_vcpu *v;

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

		rc = SIGP_CC_ORDER_CODE_ACCEPTED;
		break;
	default:
		rc = -EOPNOTSUPP;
	}
	return rc;
}

static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
			     u64 *reg)
{
	struct kvm_s390_local_interrupt *li;
	struct kvm_vcpu *dst_vcpu = NULL;
	struct kvm_s390_interrupt_info *inti;
	int rc;

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

	/*
	 * Make sure the new value is valid memory. We only need to check the
	 * first page, since address is 8k aligned and memory pieces are always
	 * at least 1MB aligned and have at least a size of 1MB.
	 */
	address &= 0x7fffe000u;
	if (kvm_is_error_gpa(vcpu->kvm, address)) {
		*reg &= 0xffffffff00000000UL;
		*reg |= SIGP_STATUS_INVALID_PARAMETER;
		return SIGP_CC_STATUS_STORED;
	}

	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	if (!inti)
		return SIGP_CC_BUSY;

	spin_lock_bh(&li->lock);
	/* cpu must be in stopped state */
	if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
		*reg &= 0xffffffff00000000UL;
		*reg |= SIGP_STATUS_INCORRECT_STATE;
		rc = SIGP_CC_STATUS_STORED;
		kfree(inti);
		goto out_li;
	}

	inti->type = KVM_S390_SIGP_SET_PREFIX;
	inti->prefix.address = address;

	list_add_tail(&inti->list, &li->list);
	atomic_set(&li->active, 1);
	if (waitqueue_active(li->wq))
		wake_up_interruptible(li->wq);
	rc = SIGP_CC_ORDER_CODE_ACCEPTED;

	VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
out_li:
	spin_unlock_bh(&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_bh(&dst_vcpu->arch.local_int.lock);
	flags = atomic_read(dst_vcpu->arch.local_int.cpuflags);
	spin_unlock_bh(&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_bh(&li->lock);
	if (li->action_bits & ACTION_STOP_ON_STOP)
		rc = SIGP_CC_BUSY;
	spin_unlock_bh(&li->lock);

	return rc;
}

int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
{
	int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
	u32 parameter;
	u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
	u8 order_code;
	int rc;

	/* sigp in userspace can exit */
	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);

	order_code = kvm_s390_get_base_disp_rs(vcpu);

	if (r1 % 2)
		parameter = vcpu->run->s.regs.gprs[r1];
	else
		parameter = vcpu->run->s.regs.gprs[r1 + 1];

	trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter);
	switch (order_code) {
	case SIGP_SENSE:
		vcpu->stat.instruction_sigp_sense++;
		rc = __sigp_sense(vcpu, cpu_addr,
				  &vcpu->run->s.regs.gprs[r1]);
		break;
	case SIGP_EXTERNAL_CALL:
		vcpu->stat.instruction_sigp_external_call++;
		rc = __sigp_external_call(vcpu, cpu_addr);
		break;
	case SIGP_EMERGENCY_SIGNAL:
		vcpu->stat.instruction_sigp_emergency++;
		rc = __sigp_emergency(vcpu, cpu_addr);
		break;
	case SIGP_STOP:
		vcpu->stat.instruction_sigp_stop++;
		rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP);
		break;
	case SIGP_STOP_AND_STORE_STATUS:
		vcpu->stat.instruction_sigp_stop++;
		rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP |
						 ACTION_STOP_ON_STOP);
		break;
	case SIGP_STORE_STATUS_AT_ADDRESS:
		rc = __sigp_store_status_at_addr(vcpu, cpu_addr, parameter,
						 &vcpu->run->s.regs.gprs[r1]);
		break;
	case SIGP_SET_ARCHITECTURE:
		vcpu->stat.instruction_sigp_arch++;
		rc = __sigp_set_arch(vcpu, parameter);
		break;
	case SIGP_SET_PREFIX:
		vcpu->stat.instruction_sigp_prefix++;
		rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
				       &vcpu->run->s.regs.gprs[r1]);
		break;
	case SIGP_COND_EMERGENCY_SIGNAL:
		rc = __sigp_conditional_emergency(vcpu, cpu_addr, parameter,
						  &vcpu->run->s.regs.gprs[r1]);
		break;
	case SIGP_SENSE_RUNNING:
		vcpu->stat.instruction_sigp_sense_running++;
		rc = __sigp_sense_running(vcpu, cpu_addr,
					  &vcpu->run->s.regs.gprs[r1]);
		break;
	case SIGP_START:
		rc = sigp_check_callable(vcpu, cpu_addr);
		if (rc == SIGP_CC_ORDER_CODE_ACCEPTED)
			rc = -EOPNOTSUPP;    /* Handle START in user space */
		break;
	case SIGP_RESTART:
		vcpu->stat.instruction_sigp_restart++;
		rc = sigp_check_callable(vcpu, cpu_addr);
		if (rc == SIGP_CC_ORDER_CODE_ACCEPTED) {
			VCPU_EVENT(vcpu, 4,
				   "sigp restart %x to handle userspace",
				   cpu_addr);
			/* user space must know about restart */
			rc = -EOPNOTSUPP;
		}
		break;
	default:
		return -EOPNOTSUPP;
	}

	if (rc < 0)
		return rc;

	kvm_s390_set_psw_cc(vcpu, rc);
	return 0;
}

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

	trace_kvm_s390_handle_sigp_pei(vcpu, order_code, cpu_addr);

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

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

		kvm_s390_set_psw_cc(vcpu, SIGP_CC_ORDER_CODE_ACCEPTED);
		return 0;
	}

	return -EOPNOTSUPP;
}
Commit	Line	Data
5288fbf0	1	/*
a53c8fab	2	* handling interprocessor communication
5288fbf0	3	*
b13d3580	4	* Copyright IBM Corp. 2008, 2013
5288fbf0 CB	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License (version 2 only)
	8	* as published by the Free Software Foundation.
	9	*
	10	* Author(s): Carsten Otte <cotte@de.ibm.com>
	11	* Christian Borntraeger <borntraeger@de.ibm.com>
9ace903d	12	* Christian Ehrhardt <ehrhardt@de.ibm.com>
5288fbf0 CB	13	*/
	14
	15	#include <linux/kvm.h>
	16	#include <linux/kvm_host.h>
5a0e3ad6	17	#include <linux/slab.h>
a9ae32c3	18	#include <asm/sigp.h>
5288fbf0 CB	19	#include "gaccess.h"
5288fbf0 CB	20	#include "kvm-s390.h"
5786fffa	21	#include "trace.h"
5288fbf0	22
0096369d	23	static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr,
5a32c1af	24	u64 *reg)
5288fbf0	25	{
1ee0bc55 JF	26	struct kvm_s390_local_interrupt *li;
	27	struct kvm_vcpu *dst_vcpu = NULL;
	28	int cpuflags;
5288fbf0 CB	29	int rc;
	30
	31	if (cpu_addr >= KVM_MAX_VCPUS)
ea1918dd	32	return SIGP_CC_NOT_OPERATIONAL;
5288fbf0	33
1ee0bc55 JF	34	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	35	if (!dst_vcpu)
	36	return SIGP_CC_NOT_OPERATIONAL;
	37	li = &dst_vcpu->arch.local_int;
	38
	39	cpuflags = atomic_read(li->cpuflags);
	40	if (!(cpuflags & (CPUSTAT_ECALL_PEND \| CPUSTAT_STOPPED)))
21b26c08 CH	41	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
21b26c08 CH	42	else {
5288fbf0	43	*reg &= 0xffffffff00000000UL;
1ee0bc55	44	if (cpuflags & CPUSTAT_ECALL_PEND)
21b26c08	45	*reg \|= SIGP_STATUS_EXT_CALL_PENDING;
1ee0bc55	46	if (cpuflags & CPUSTAT_STOPPED)
21b26c08	47	*reg \|= SIGP_STATUS_STOPPED;
ea1918dd	48	rc = SIGP_CC_STATUS_STORED;
5288fbf0	49	}
5288fbf0 CB	50
	51	VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc);
	52	return rc;
	53	}
	54
	55	static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
	56	{
180c12fb CB	57	struct kvm_s390_local_interrupt *li;
180c12fb CB	58	struct kvm_s390_interrupt_info *inti;
1ee0bc55	59	struct kvm_vcpu *dst_vcpu = NULL;
5288fbf0	60
91880d07 TH	61	if (cpu_addr < KVM_MAX_VCPUS)
	62	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	63	if (!dst_vcpu)
ea1918dd	64	return SIGP_CC_NOT_OPERATIONAL;
5288fbf0 CB	65
	66	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	67	if (!inti)
	68	return -ENOMEM;
	69
	70	inti->type = KVM_S390_INT_EMERGENCY;
7697e71f	71	inti->emerg.code = vcpu->vcpu_id;
5288fbf0	72
1ee0bc55	73	li = &dst_vcpu->arch.local_int;
5288fbf0 CB	74	spin_lock_bh(&li->lock);
	75	list_add_tail(&inti->list, &li->list);
	76	atomic_set(&li->active, 1);
	77	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
d0321a24 CB	78	if (waitqueue_active(li->wq))
d0321a24 CB	79	wake_up_interruptible(li->wq);
5288fbf0	80	spin_unlock_bh(&li->lock);
7697e71f	81	VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
1ee0bc55 JF	82
1ee0bc55 JF	83	return SIGP_CC_ORDER_CODE_ACCEPTED;
7697e71f CE	84	}
7697e71f CE	85
b13d3580 TH	86	static int __sigp_conditional_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr,
	87	u16 asn, u64 *reg)
	88	{
	89	struct kvm_vcpu *dst_vcpu = NULL;
	90	const u64 psw_int_mask = PSW_MASK_IO \| PSW_MASK_EXT;
	91	u16 p_asn, s_asn;
	92	psw_t *psw;
	93	u32 flags;
	94
	95	if (cpu_addr < KVM_MAX_VCPUS)
	96	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	97	if (!dst_vcpu)
	98	return SIGP_CC_NOT_OPERATIONAL;
	99	flags = atomic_read(&dst_vcpu->arch.sie_block->cpuflags);
	100	psw = &dst_vcpu->arch.sie_block->gpsw;
	101	p_asn = dst_vcpu->arch.sie_block->gcr[4] & 0xffff; /* Primary ASN */
	102	s_asn = dst_vcpu->arch.sie_block->gcr[3] & 0xffff; /* Secondary ASN */
	103
	104	/* Deliver the emergency signal? */
	105	if (!(flags & CPUSTAT_STOPPED)
	106	\|\| (psw->mask & psw_int_mask) != psw_int_mask
	107	\|\| ((flags & CPUSTAT_WAIT) && psw->addr != 0)
	108	\|\| (!(flags & CPUSTAT_WAIT) && (asn == p_asn \|\| asn == s_asn))) {
	109	return __sigp_emergency(vcpu, cpu_addr);
	110	} else {
	111	*reg &= 0xffffffff00000000UL;
	112	*reg \|= SIGP_STATUS_INCORRECT_STATE;
	113	return SIGP_CC_STATUS_STORED;
	114	}
	115	}
	116
7697e71f CE	117	static int __sigp_external_call(struct kvm_vcpu *vcpu, u16 cpu_addr)
7697e71f CE	118	{
7697e71f CE	119	struct kvm_s390_local_interrupt *li;
7697e71f CE	120	struct kvm_s390_interrupt_info *inti;
1ee0bc55	121	struct kvm_vcpu *dst_vcpu = NULL;
7697e71f	122
91880d07 TH	123	if (cpu_addr < KVM_MAX_VCPUS)
	124	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	125	if (!dst_vcpu)
ea1918dd	126	return SIGP_CC_NOT_OPERATIONAL;
7697e71f CE	127
	128	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	129	if (!inti)
	130	return -ENOMEM;
	131
	132	inti->type = KVM_S390_INT_EXTERNAL_CALL;
	133	inti->extcall.code = vcpu->vcpu_id;
	134
1ee0bc55	135	li = &dst_vcpu->arch.local_int;
7697e71f CE	136	spin_lock_bh(&li->lock);
	137	list_add_tail(&inti->list, &li->list);
	138	atomic_set(&li->active, 1);
	139	atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
d0321a24 CB	140	if (waitqueue_active(li->wq))
d0321a24 CB	141	wake_up_interruptible(li->wq);
7697e71f	142	spin_unlock_bh(&li->lock);
7697e71f	143	VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x", cpu_addr);
1ee0bc55 JF	144
1ee0bc55 JF	145	return SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0 CB	146	}
5288fbf0 CB	147
9ace903d	148	static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action)
5288fbf0	149	{
180c12fb	150	struct kvm_s390_interrupt_info *inti;
e879892c	151	int rc = SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0	152
9940fa80	153	inti = kzalloc(sizeof(*inti), GFP_ATOMIC);
5288fbf0 CB	154	if (!inti)
5288fbf0 CB	155	return -ENOMEM;
5288fbf0 CB	156	inti->type = KVM_S390_SIGP_STOP;
5288fbf0 CB	157
5288fbf0	158	spin_lock_bh(&li->lock);
a046b816 CD	159	if ((atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
a046b816 CD	160	kfree(inti);
e879892c TH	161	if ((action & ACTION_STORE_ON_STOP) != 0)
e879892c TH	162	rc = -ESHUTDOWN;
24a13044	163	goto out;
a046b816	164	}
5288fbf0 CB	165	list_add_tail(&inti->list, &li->list);
	166	atomic_set(&li->active, 1);
	167	atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
9ace903d	168	li->action_bits \|= action;
d0321a24 CB	169	if (waitqueue_active(li->wq))
d0321a24 CB	170	wake_up_interruptible(li->wq);
24a13044	171	out:
5288fbf0	172	spin_unlock_bh(&li->lock);
9ace903d	173
e879892c	174	return rc;
9ace903d CE	175	}
	176
	177	static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action)
	178	{
9ace903d	179	struct kvm_s390_local_interrupt *li;
1ee0bc55	180	struct kvm_vcpu *dst_vcpu = NULL;
9ace903d CE	181	int rc;
	182
	183	if (cpu_addr >= KVM_MAX_VCPUS)
ea1918dd	184	return SIGP_CC_NOT_OPERATIONAL;
9ace903d	185
1ee0bc55 JF	186	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	187	if (!dst_vcpu)
	188	return SIGP_CC_NOT_OPERATIONAL;
	189	li = &dst_vcpu->arch.local_int;
9ace903d CE	190
	191	rc = __inject_sigp_stop(li, action);
	192
5288fbf0	193	VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
e879892c TH	194
	195	if ((action & ACTION_STORE_ON_STOP) != 0 && rc == -ESHUTDOWN) {
	196	/* If the CPU has already been stopped, we still have
	197	* to save the status when doing stop-and-store. This
	198	* has to be done after unlocking all spinlocks. */
e879892c TH	199	rc = kvm_s390_store_status_unloaded(dst_vcpu,
	200	KVM_S390_STORE_STATUS_NOADDR);
	201	}
	202
5288fbf0 CB	203	return rc;
	204	}
	205
	206	static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
	207	{
	208	int rc;
3c038e6b DD	209	unsigned int i;
3c038e6b DD	210	struct kvm_vcpu *v;
5288fbf0 CB	211
	212	switch (parameter & 0xff) {
	213	case 0:
ea1918dd	214	rc = SIGP_CC_NOT_OPERATIONAL;
5288fbf0 CB	215	break;
	216	case 1:
	217	case 2:
3c038e6b DD	218	kvm_for_each_vcpu(i, v, vcpu->kvm) {
	219	v->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
	220	kvm_clear_async_pf_completion_queue(v);
	221	}
	222
ea1918dd	223	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0 CB	224	break;
5288fbf0 CB	225	default:
b8e660b8	226	rc = -EOPNOTSUPP;
5288fbf0 CB	227	}
	228	return rc;
	229	}
	230
	231	static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
5a32c1af	232	u64 *reg)
5288fbf0	233	{
13b191ae TH	234	struct kvm_s390_local_interrupt *li;
13b191ae TH	235	struct kvm_vcpu *dst_vcpu = NULL;
180c12fb	236	struct kvm_s390_interrupt_info *inti;
5288fbf0	237	int rc;
5288fbf0	238
13b191ae TH	239	if (cpu_addr < KVM_MAX_VCPUS)
	240	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	241	if (!dst_vcpu)
	242	return SIGP_CC_NOT_OPERATIONAL;
	243	li = &dst_vcpu->arch.local_int;
	244
665170cb HC	245	/*
	246	* Make sure the new value is valid memory. We only need to check the
	247	* first page, since address is 8k aligned and memory pieces are always
	248	* at least 1MB aligned and have at least a size of 1MB.
	249	*/
	250	address &= 0x7fffe000u;
	251	if (kvm_is_error_gpa(vcpu->kvm, address)) {
0744426e	252	*reg &= 0xffffffff00000000UL;
a9ae32c3	253	*reg \|= SIGP_STATUS_INVALID_PARAMETER;
ea1918dd	254	return SIGP_CC_STATUS_STORED;
5288fbf0 CB	255	}
	256
	257	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	258	if (!inti)
ea1918dd	259	return SIGP_CC_BUSY;
5288fbf0	260
5288fbf0 CB	261	spin_lock_bh(&li->lock);
5288fbf0 CB	262	/* cpu must be in stopped state */
9e6dabef	263	if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
0744426e HC	264	*reg &= 0xffffffff00000000UL;
0744426e HC	265	*reg \|= SIGP_STATUS_INCORRECT_STATE;
ea1918dd	266	rc = SIGP_CC_STATUS_STORED;
5288fbf0 CB	267	kfree(inti);
	268	goto out_li;
	269	}
	270
	271	inti->type = KVM_S390_SIGP_SET_PREFIX;
	272	inti->prefix.address = address;
	273
	274	list_add_tail(&inti->list, &li->list);
	275	atomic_set(&li->active, 1);
d0321a24 CB	276	if (waitqueue_active(li->wq))
d0321a24 CB	277	wake_up_interruptible(li->wq);
ea1918dd	278	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0 CB	279
	280	VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
	281	out_li:
	282	spin_unlock_bh(&li->lock);
5288fbf0 CB	283	return rc;
	284	}
	285
00e9e435 TH	286	static int __sigp_store_status_at_addr(struct kvm_vcpu *vcpu, u16 cpu_id,
	287	u32 addr, u64 *reg)
	288	{
	289	struct kvm_vcpu *dst_vcpu = NULL;
	290	int flags;
	291	int rc;
	292
	293	if (cpu_id < KVM_MAX_VCPUS)
	294	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_id);
	295	if (!dst_vcpu)
	296	return SIGP_CC_NOT_OPERATIONAL;
	297
	298	spin_lock_bh(&dst_vcpu->arch.local_int.lock);
	299	flags = atomic_read(dst_vcpu->arch.local_int.cpuflags);
	300	spin_unlock_bh(&dst_vcpu->arch.local_int.lock);
	301	if (!(flags & CPUSTAT_STOPPED)) {
	302	*reg &= 0xffffffff00000000UL;
	303	*reg \|= SIGP_STATUS_INCORRECT_STATE;
	304	return SIGP_CC_STATUS_STORED;
	305	}
	306
	307	addr &= 0x7ffffe00;
	308	rc = kvm_s390_store_status_unloaded(dst_vcpu, addr);
	309	if (rc == -EFAULT) {
	310	*reg &= 0xffffffff00000000UL;
	311	*reg \|= SIGP_STATUS_INVALID_PARAMETER;
	312	rc = SIGP_CC_STATUS_STORED;
	313	}
	314	return rc;
	315	}
	316
bd59d3a4	317	static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr,
5a32c1af	318	u64 *reg)
bd59d3a4	319	{
1ee0bc55 JF	320	struct kvm_s390_local_interrupt *li;
1ee0bc55 JF	321	struct kvm_vcpu *dst_vcpu = NULL;
bd59d3a4	322	int rc;
bd59d3a4 CH	323
bd59d3a4 CH	324	if (cpu_addr >= KVM_MAX_VCPUS)
ea1918dd	325	return SIGP_CC_NOT_OPERATIONAL;
bd59d3a4	326
1ee0bc55 JF	327	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	328	if (!dst_vcpu)
	329	return SIGP_CC_NOT_OPERATIONAL;
	330	li = &dst_vcpu->arch.local_int;
	331	if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
	332	/* running */
	333	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
	334	} else {
	335	/* not running */
	336	*reg &= 0xffffffff00000000UL;
	337	*reg \|= SIGP_STATUS_NOT_RUNNING;
	338	rc = SIGP_CC_STATUS_STORED;
bd59d3a4	339	}
bd59d3a4 CH	340
	341	VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x", cpu_addr,
	342	rc);
	343
	344	return rc;
	345	}
	346
cc92d6de TH	347	/* Test whether the destination CPU is available and not busy */
cc92d6de TH	348	static int sigp_check_callable(struct kvm_vcpu *vcpu, u16 cpu_addr)
151104a7	349	{
151104a7	350	struct kvm_s390_local_interrupt *li;
ea1918dd	351	int rc = SIGP_CC_ORDER_CODE_ACCEPTED;
1ee0bc55	352	struct kvm_vcpu *dst_vcpu = NULL;
151104a7 JF	353
151104a7 JF	354	if (cpu_addr >= KVM_MAX_VCPUS)
ea1918dd	355	return SIGP_CC_NOT_OPERATIONAL;
151104a7	356
1ee0bc55 JF	357	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	358	if (!dst_vcpu)
	359	return SIGP_CC_NOT_OPERATIONAL;
	360	li = &dst_vcpu->arch.local_int;
151104a7 JF	361	spin_lock_bh(&li->lock);
151104a7 JF	362	if (li->action_bits & ACTION_STOP_ON_STOP)
ea1918dd	363	rc = SIGP_CC_BUSY;
151104a7	364	spin_unlock_bh(&li->lock);
1ee0bc55	365
151104a7 JF	366	return rc;
	367	}
	368
5288fbf0 CB	369	int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
	370	{
	371	int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
	372	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
5288fbf0	373	u32 parameter;
5a32c1af	374	u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
5288fbf0 CB	375	u8 order_code;
	376	int rc;
	377
3eb77d51 CB	378	/* sigp in userspace can exit */
3eb77d51 CB	379	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
208dd756	380	return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
3eb77d51	381
b1c571a5	382	order_code = kvm_s390_get_base_disp_rs(vcpu);
5288fbf0 CB	383
5288fbf0 CB	384	if (r1 % 2)
5a32c1af	385	parameter = vcpu->run->s.regs.gprs[r1];
5288fbf0	386	else
5a32c1af	387	parameter = vcpu->run->s.regs.gprs[r1 + 1];
5288fbf0	388
5786fffa	389	trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter);
5288fbf0 CB	390	switch (order_code) {
	391	case SIGP_SENSE:
	392	vcpu->stat.instruction_sigp_sense++;
	393	rc = __sigp_sense(vcpu, cpu_addr,
5a32c1af	394	&vcpu->run->s.regs.gprs[r1]);
5288fbf0	395	break;
7697e71f CE	396	case SIGP_EXTERNAL_CALL:
	397	vcpu->stat.instruction_sigp_external_call++;
	398	rc = __sigp_external_call(vcpu, cpu_addr);
	399	break;
a9ae32c3	400	case SIGP_EMERGENCY_SIGNAL:
5288fbf0 CB	401	vcpu->stat.instruction_sigp_emergency++;
	402	rc = __sigp_emergency(vcpu, cpu_addr);
	403	break;
	404	case SIGP_STOP:
	405	vcpu->stat.instruction_sigp_stop++;
9ace903d	406	rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP);
5288fbf0	407	break;
a9ae32c3	408	case SIGP_STOP_AND_STORE_STATUS:
5288fbf0	409	vcpu->stat.instruction_sigp_stop++;
9ec2d6dc JF	410	rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP \|
9ec2d6dc JF	411	ACTION_STOP_ON_STOP);
5288fbf0	412	break;
00e9e435 TH	413	case SIGP_STORE_STATUS_AT_ADDRESS:
	414	rc = __sigp_store_status_at_addr(vcpu, cpu_addr, parameter,
	415	&vcpu->run->s.regs.gprs[r1]);
	416	break;
a9ae32c3	417	case SIGP_SET_ARCHITECTURE:
5288fbf0 CB	418	vcpu->stat.instruction_sigp_arch++;
	419	rc = __sigp_set_arch(vcpu, parameter);
	420	break;
	421	case SIGP_SET_PREFIX:
	422	vcpu->stat.instruction_sigp_prefix++;
	423	rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
5a32c1af	424	&vcpu->run->s.regs.gprs[r1]);
5288fbf0	425	break;
b13d3580 TH	426	case SIGP_COND_EMERGENCY_SIGNAL:
	427	rc = __sigp_conditional_emergency(vcpu, cpu_addr, parameter,
	428	&vcpu->run->s.regs.gprs[r1]);
	429	break;
bd59d3a4 CH	430	case SIGP_SENSE_RUNNING:
	431	vcpu->stat.instruction_sigp_sense_running++;
	432	rc = __sigp_sense_running(vcpu, cpu_addr,
5a32c1af	433	&vcpu->run->s.regs.gprs[r1]);
bd59d3a4	434	break;
58bc33b2 TH	435	case SIGP_START:
	436	rc = sigp_check_callable(vcpu, cpu_addr);
	437	if (rc == SIGP_CC_ORDER_CODE_ACCEPTED)
	438	rc = -EOPNOTSUPP; /* Handle START in user space */
	439	break;
5288fbf0 CB	440	case SIGP_RESTART:
5288fbf0 CB	441	vcpu->stat.instruction_sigp_restart++;
cc92d6de TH	442	rc = sigp_check_callable(vcpu, cpu_addr);
	443	if (rc == SIGP_CC_ORDER_CODE_ACCEPTED) {
	444	VCPU_EVENT(vcpu, 4,
	445	"sigp restart %x to handle userspace",
	446	cpu_addr);
	447	/* user space must know about restart */
	448	rc = -EOPNOTSUPP;
	449	}
	450	break;
5288fbf0	451	default:
b8e660b8	452	return -EOPNOTSUPP;
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
	484	spin_lock_bh(&dest_vcpu->arch.local_int.lock);
	485	if (waitqueue_active(&dest_vcpu->wq))
	486	wake_up_interruptible(&dest_vcpu->wq);
	487	dest_vcpu->preempted = true;
	488	spin_unlock_bh(&dest_vcpu->arch.local_int.lock);
	489
	490	kvm_s390_set_psw_cc(vcpu, SIGP_CC_ORDER_CODE_ACCEPTED);
	491	return 0;
	492	}
	493
	494	return -EOPNOTSUPP;
	495	}