[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_interrupt s390int = {
		.type = KVM_S390_INT_EMERGENCY,
		.parm = vcpu->vcpu_id,
	};
	int rc = 0;

	rc = kvm_s390_inject_vcpu(dst_vcpu, &s390int);
	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_interrupt s390int = {
		.type = KVM_S390_INT_EXTERNAL_CALL,
		.parm = vcpu->vcpu_id,
	};
	int rc;

	rc = kvm_s390_inject_vcpu(dst_vcpu, &s390int);
	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 __inject_sigp_stop(struct kvm_vcpu *dst_vcpu, int action)
{
	struct kvm_s390_local_interrupt *li = &dst_vcpu->arch.local_int;
	struct kvm_s390_interrupt_info *inti;
	int rc = SIGP_CC_ORDER_CODE_ACCEPTED;

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

	spin_lock(&li->lock);
	if (li->action_bits & ACTION_STOP_ON_STOP) {
		/* another SIGP STOP is pending */
		kfree(inti);
		rc = SIGP_CC_BUSY;
		goto out;
	}
	if ((atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
		kfree(inti);
		if ((action & ACTION_STORE_ON_STOP) != 0)
			rc = -ESHUTDOWN;
		goto out;
	}
	list_add_tail(&inti->list, &li->list);
	atomic_set(&li->active, 1);
	li->action_bits |= action;
	atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
	kvm_s390_vcpu_wakeup(dst_vcpu);
out:
	spin_unlock(&li->lock);

	return rc;
}

static int __sigp_stop(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu)
{
	int rc;

	rc = __inject_sigp_stop(dst_vcpu, ACTION_STOP_ON_STOP);
	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)
{
	int rc;

	rc = __inject_sigp_stop(dst_vcpu, ACTION_STOP_ON_STOP |
					      ACTION_STORE_ON_STOP);
	VCPU_EVENT(vcpu, 4, "sent sigp stop and store status to cpu %x",
		   dst_vcpu->vcpu_id);

	if (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, struct kvm_vcpu *dst_vcpu,
			     u32 address, u64 *reg)
{
	struct kvm_s390_local_interrupt *li;
	struct kvm_s390_interrupt_info *inti;
	int rc;

	li = &dst_vcpu->arch.local_int;

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

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

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

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

	list_add_tail(&inti->list, &li->list);
	atomic_set(&li->active, 1);
	kvm_s390_vcpu_wakeup(dst_vcpu);
	rc = SIGP_CC_ORDER_CODE_ACCEPTED;

	VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", dst_vcpu->vcpu_id,
		   address);
out_li:
	spin_unlock(&li->lock);
	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;

	spin_lock(&dst_vcpu->arch.local_int.lock);
	flags = atomic_read(dst_vcpu->arch.local_int.cpuflags);
	spin_unlock(&dst_vcpu->arch.local_int.lock);
	if (!(flags & CPUSTAT_STOPPED)) {
		*reg &= 0xffffffff00000000UL;
		*reg |= SIGP_STATUS_INCORRECT_STATE;
		return SIGP_CC_STATUS_STORED;
	}

	addr &= 0x7ffffe00;
	rc = kvm_s390_store_status_unloaded(dst_vcpu, addr);
	if (rc == -EFAULT) {
		*reg &= 0xffffffff00000000UL;
		*reg |= SIGP_STATUS_INVALID_PARAMETER;
		rc = SIGP_CC_STATUS_STORED;
	}
	return rc;
}

static int __sigp_sense_running(struct kvm_vcpu *vcpu,
				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;

	spin_lock(&li->lock);
	if (li->action_bits & ACTION_STOP_ON_STOP)
		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	{
22ff4a33 JF	52	struct kvm_s390_interrupt s390int = {
	53	.type = KVM_S390_INT_EMERGENCY,
	54	.parm = vcpu->vcpu_id,
	55	};
22ff4a33	56	int rc = 0;
5288fbf0	57
22ff4a33 JF	58	rc = kvm_s390_inject_vcpu(dst_vcpu, &s390int);
22ff4a33 JF	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	{
22ff4a33 JF	101	struct kvm_s390_interrupt s390int = {
	102	.type = KVM_S390_INT_EXTERNAL_CALL,
	103	.parm = vcpu->vcpu_id,
	104	};
22ff4a33	105	int rc;
7697e71f	106
22ff4a33 JF	107	rc = kvm_s390_inject_vcpu(dst_vcpu, &s390int);
22ff4a33 JF	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
0e9c85a5	115	static int __inject_sigp_stop(struct kvm_vcpu *dst_vcpu, int action)
5288fbf0	116	{
0e9c85a5	117	struct kvm_s390_local_interrupt *li = &dst_vcpu->arch.local_int;
180c12fb	118	struct kvm_s390_interrupt_info *inti;
e879892c	119	int rc = SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0	120
9940fa80	121	inti = kzalloc(sizeof(*inti), GFP_ATOMIC);
5288fbf0 CB	122	if (!inti)
5288fbf0 CB	123	return -ENOMEM;
5288fbf0 CB	124	inti->type = KVM_S390_SIGP_STOP;
5288fbf0 CB	125
4ae3c081	126	spin_lock(&li->lock);
7dfc63cf DH	127	if (li->action_bits & ACTION_STOP_ON_STOP) {
7dfc63cf DH	128	/* another SIGP STOP is pending */
d514f426	129	kfree(inti);
7dfc63cf DH	130	rc = SIGP_CC_BUSY;
	131	goto out;
	132	}
a046b816 CD	133	if ((atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
a046b816 CD	134	kfree(inti);
e879892c TH	135	if ((action & ACTION_STORE_ON_STOP) != 0)
e879892c TH	136	rc = -ESHUTDOWN;
24a13044	137	goto out;
a046b816	138	}
5288fbf0 CB	139	list_add_tail(&inti->list, &li->list);
5288fbf0 CB	140	atomic_set(&li->active, 1);
9ace903d	141	li->action_bits \|= action;
7dfc63cf	142	atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
0e9c85a5	143	kvm_s390_vcpu_wakeup(dst_vcpu);
24a13044	144	out:
4ae3c081	145	spin_unlock(&li->lock);
9ace903d	146
e879892c	147	return rc;
9ace903d CE	148	}
9ace903d CE	149
a6cc3108	150	static int __sigp_stop(struct kvm_vcpu vcpu, struct kvm_vcpu dst_vcpu)
9ace903d	151	{
9ace903d CE	152	int rc;
9ace903d CE	153
a6cc3108	154	rc = __inject_sigp_stop(dst_vcpu, ACTION_STOP_ON_STOP);
3d95c7d2	155	VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", dst_vcpu->vcpu_id);
e879892c	156
a6cc3108 DH	157	return rc;
	158	}
	159
	160	static int __sigp_stop_and_store_status(struct kvm_vcpu *vcpu,
	161	struct kvm_vcpu dst_vcpu, u64 reg)
	162	{
	163	int rc;
	164
	165	rc = __inject_sigp_stop(dst_vcpu, ACTION_STOP_ON_STOP \|
	166	ACTION_STORE_ON_STOP);
	167	VCPU_EVENT(vcpu, 4, "sent sigp stop and store status to cpu %x",
	168	dst_vcpu->vcpu_id);
	169
	170	if (rc == -ESHUTDOWN) {
e879892c TH	171	/* If the CPU has already been stopped, we still have
	172	* to save the status when doing stop-and-store. This
	173	* has to be done after unlocking all spinlocks. */
e879892c TH	174	rc = kvm_s390_store_status_unloaded(dst_vcpu,
	175	KVM_S390_STORE_STATUS_NOADDR);
	176	}
	177
5288fbf0 CB	178	return rc;
	179	}
	180
	181	static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
	182	{
	183	int rc;
3c038e6b DD	184	unsigned int i;
3c038e6b DD	185	struct kvm_vcpu *v;
5288fbf0 CB	186
	187	switch (parameter & 0xff) {
	188	case 0:
ea1918dd	189	rc = SIGP_CC_NOT_OPERATIONAL;
5288fbf0 CB	190	break;
	191	case 1:
	192	case 2:
3c038e6b DD	193	kvm_for_each_vcpu(i, v, vcpu->kvm) {
	194	v->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
	195	kvm_clear_async_pf_completion_queue(v);
	196	}
	197
ea1918dd	198	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0 CB	199	break;
5288fbf0 CB	200	default:
b8e660b8	201	rc = -EOPNOTSUPP;
5288fbf0 CB	202	}
	203	return rc;
	204	}
	205
3d95c7d2 DH	206	static int __sigp_set_prefix(struct kvm_vcpu vcpu, struct kvm_vcpu dst_vcpu,
3d95c7d2 DH	207	u32 address, u64 *reg)
5288fbf0	208	{
13b191ae	209	struct kvm_s390_local_interrupt *li;
180c12fb	210	struct kvm_s390_interrupt_info *inti;
5288fbf0	211	int rc;
5288fbf0	212
13b191ae TH	213	li = &dst_vcpu->arch.local_int;
13b191ae TH	214
665170cb HC	215	/*
	216	* Make sure the new value is valid memory. We only need to check the
	217	* first page, since address is 8k aligned and memory pieces are always
	218	* at least 1MB aligned and have at least a size of 1MB.
	219	*/
	220	address &= 0x7fffe000u;
	221	if (kvm_is_error_gpa(vcpu->kvm, address)) {
0744426e	222	*reg &= 0xffffffff00000000UL;
a9ae32c3	223	*reg \|= SIGP_STATUS_INVALID_PARAMETER;
ea1918dd	224	return SIGP_CC_STATUS_STORED;
5288fbf0 CB	225	}
	226
	227	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
	228	if (!inti)
ea1918dd	229	return SIGP_CC_BUSY;
5288fbf0	230
4ae3c081	231	spin_lock(&li->lock);
5288fbf0	232	/* cpu must be in stopped state */
9e6dabef	233	if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
0744426e HC	234	*reg &= 0xffffffff00000000UL;
0744426e HC	235	*reg \|= SIGP_STATUS_INCORRECT_STATE;
ea1918dd	236	rc = SIGP_CC_STATUS_STORED;
5288fbf0 CB	237	kfree(inti);
	238	goto out_li;
	239	}
	240
	241	inti->type = KVM_S390_SIGP_SET_PREFIX;
	242	inti->prefix.address = address;
	243
	244	list_add_tail(&inti->list, &li->list);
	245	atomic_set(&li->active, 1);
0e9c85a5	246	kvm_s390_vcpu_wakeup(dst_vcpu);
ea1918dd	247	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
5288fbf0	248
3d95c7d2 DH	249	VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", dst_vcpu->vcpu_id,
3d95c7d2 DH	250	address);
5288fbf0	251	out_li:
4ae3c081	252	spin_unlock(&li->lock);
5288fbf0 CB	253	return rc;
	254	}
	255
3d95c7d2 DH	256	static int __sigp_store_status_at_addr(struct kvm_vcpu *vcpu,
	257	struct kvm_vcpu *dst_vcpu,
	258	u32 addr, u64 *reg)
00e9e435	259	{
00e9e435 TH	260	int flags;
	261	int rc;
	262
4ae3c081	263	spin_lock(&dst_vcpu->arch.local_int.lock);
00e9e435	264	flags = atomic_read(dst_vcpu->arch.local_int.cpuflags);
4ae3c081	265	spin_unlock(&dst_vcpu->arch.local_int.lock);
00e9e435 TH	266	if (!(flags & CPUSTAT_STOPPED)) {
	267	*reg &= 0xffffffff00000000UL;
	268	*reg \|= SIGP_STATUS_INCORRECT_STATE;
	269	return SIGP_CC_STATUS_STORED;
	270	}
	271
	272	addr &= 0x7ffffe00;
	273	rc = kvm_s390_store_status_unloaded(dst_vcpu, addr);
	274	if (rc == -EFAULT) {
	275	*reg &= 0xffffffff00000000UL;
	276	*reg \|= SIGP_STATUS_INVALID_PARAMETER;
	277	rc = SIGP_CC_STATUS_STORED;
	278	}
	279	return rc;
	280	}
	281
3d95c7d2 DH	282	static int __sigp_sense_running(struct kvm_vcpu *vcpu,
3d95c7d2 DH	283	struct kvm_vcpu dst_vcpu, u64 reg)
bd59d3a4	284	{
1ee0bc55	285	struct kvm_s390_local_interrupt *li;
bd59d3a4	286	int rc;
bd59d3a4	287
1ee0bc55 JF	288	li = &dst_vcpu->arch.local_int;
	289	if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
	290	/* running */
	291	rc = SIGP_CC_ORDER_CODE_ACCEPTED;
	292	} else {
	293	/* not running */
	294	*reg &= 0xffffffff00000000UL;
	295	*reg \|= SIGP_STATUS_NOT_RUNNING;
	296	rc = SIGP_CC_STATUS_STORED;
bd59d3a4	297	}
bd59d3a4	298
3d95c7d2 DH	299	VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x",
3d95c7d2 DH	300	dst_vcpu->vcpu_id, rc);
bd59d3a4 CH	301
	302	return rc;
	303	}
	304
b8983830 DH	305	static int __prepare_sigp_re_start(struct kvm_vcpu *vcpu,
b8983830 DH	306	struct kvm_vcpu *dst_vcpu, u8 order_code)
151104a7	307	{
3d95c7d2	308	struct kvm_s390_local_interrupt *li = &dst_vcpu->arch.local_int;
b8983830 DH	309	/* handle (RE)START in user space */
b8983830 DH	310	int rc = -EOPNOTSUPP;
151104a7	311
4ae3c081	312	spin_lock(&li->lock);
151104a7	313	if (li->action_bits & ACTION_STOP_ON_STOP)
ea1918dd	314	rc = SIGP_CC_BUSY;
4ae3c081	315	spin_unlock(&li->lock);
1ee0bc55	316
151104a7 JF	317	return rc;
	318	}
	319
b8983830 DH	320	static int __prepare_sigp_cpu_reset(struct kvm_vcpu *vcpu,
	321	struct kvm_vcpu *dst_vcpu, u8 order_code)
	322	{
	323	/* handle (INITIAL) CPU RESET in user space */
	324	return -EOPNOTSUPP;
	325	}
	326
	327	static int __prepare_sigp_unknown(struct kvm_vcpu *vcpu,
	328	struct kvm_vcpu *dst_vcpu)
	329	{
	330	/* handle unknown orders in user space */
	331	return -EOPNOTSUPP;
	332	}
	333
3526a66b DH	334	static int handle_sigp_dst(struct kvm_vcpu *vcpu, u8 order_code,
3526a66b DH	335	u16 cpu_addr, u32 parameter, u64 *status_reg)
5288fbf0	336	{
5288fbf0	337	int rc;
3d95c7d2 DH	338	struct kvm_vcpu *dst_vcpu;
	339
	340	if (cpu_addr >= KVM_MAX_VCPUS)
	341	return SIGP_CC_NOT_OPERATIONAL;
	342
	343	dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	344	if (!dst_vcpu)
	345	return SIGP_CC_NOT_OPERATIONAL;
5288fbf0	346
5288fbf0 CB	347	switch (order_code) {
	348	case SIGP_SENSE:
	349	vcpu->stat.instruction_sigp_sense++;
3d95c7d2	350	rc = __sigp_sense(vcpu, dst_vcpu, status_reg);
5288fbf0	351	break;
7697e71f CE	352	case SIGP_EXTERNAL_CALL:
7697e71f CE	353	vcpu->stat.instruction_sigp_external_call++;
3d95c7d2	354	rc = __sigp_external_call(vcpu, dst_vcpu);
7697e71f	355	break;
a9ae32c3	356	case SIGP_EMERGENCY_SIGNAL:
5288fbf0	357	vcpu->stat.instruction_sigp_emergency++;
3d95c7d2	358	rc = __sigp_emergency(vcpu, dst_vcpu);
5288fbf0 CB	359	break;
	360	case SIGP_STOP:
	361	vcpu->stat.instruction_sigp_stop++;
a6cc3108	362	rc = __sigp_stop(vcpu, dst_vcpu);
5288fbf0	363	break;
a9ae32c3	364	case SIGP_STOP_AND_STORE_STATUS:
42cb0c9f	365	vcpu->stat.instruction_sigp_stop_store_status++;
a6cc3108	366	rc = __sigp_stop_and_store_status(vcpu, dst_vcpu, status_reg);
5288fbf0	367	break;
00e9e435	368	case SIGP_STORE_STATUS_AT_ADDRESS:
42cb0c9f	369	vcpu->stat.instruction_sigp_store_status++;
3d95c7d2	370	rc = __sigp_store_status_at_addr(vcpu, dst_vcpu, parameter,
3526a66b	371	status_reg);
5288fbf0 CB	372	break;
	373	case SIGP_SET_PREFIX:
	374	vcpu->stat.instruction_sigp_prefix++;
3d95c7d2	375	rc = __sigp_set_prefix(vcpu, dst_vcpu, parameter, status_reg);
5288fbf0	376	break;
b13d3580	377	case SIGP_COND_EMERGENCY_SIGNAL:
42cb0c9f	378	vcpu->stat.instruction_sigp_cond_emergency++;
3d95c7d2	379	rc = __sigp_conditional_emergency(vcpu, dst_vcpu, parameter,
3526a66b	380	status_reg);
b13d3580	381	break;
bd59d3a4 CH	382	case SIGP_SENSE_RUNNING:
bd59d3a4 CH	383	vcpu->stat.instruction_sigp_sense_running++;
3d95c7d2	384	rc = __sigp_sense_running(vcpu, dst_vcpu, status_reg);
bd59d3a4	385	break;
58bc33b2	386	case SIGP_START:
42cb0c9f	387	vcpu->stat.instruction_sigp_start++;
b8983830	388	rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
58bc33b2	389	break;
5288fbf0 CB	390	case SIGP_RESTART:
5288fbf0 CB	391	vcpu->stat.instruction_sigp_restart++;
b8983830 DH	392	rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
	393	break;
	394	case SIGP_INITIAL_CPU_RESET:
42cb0c9f	395	vcpu->stat.instruction_sigp_init_cpu_reset++;
b8983830 DH	396	rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
	397	break;
	398	case SIGP_CPU_RESET:
42cb0c9f	399	vcpu->stat.instruction_sigp_cpu_reset++;
b8983830	400	rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
cc92d6de	401	break;
5288fbf0	402	default:
42cb0c9f	403	vcpu->stat.instruction_sigp_unknown++;
b8983830	404	rc = __prepare_sigp_unknown(vcpu, dst_vcpu);
3526a66b DH	405	}
3526a66b DH	406
b8983830 DH	407	if (rc == -EOPNOTSUPP)
	408	VCPU_EVENT(vcpu, 4,
	409	"sigp order %u -> cpu %x: handled in user space",
	410	order_code, dst_vcpu->vcpu_id);
	411
3526a66b DH	412	return rc;
	413	}
	414
	415	int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
	416	{
	417	int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
	418	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
	419	u32 parameter;
	420	u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
	421	u8 order_code;
	422	int rc;
	423
	424	/* sigp in userspace can exit */
	425	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
	426	return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
	427
	428	order_code = kvm_s390_get_base_disp_rs(vcpu);
	429
	430	if (r1 % 2)
	431	parameter = vcpu->run->s.regs.gprs[r1];
	432	else
	433	parameter = vcpu->run->s.regs.gprs[r1 + 1];
	434
	435	trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter);
	436	switch (order_code) {
	437	case SIGP_SET_ARCHITECTURE:
	438	vcpu->stat.instruction_sigp_arch++;
	439	rc = __sigp_set_arch(vcpu, parameter);
	440	break;
	441	default:
	442	rc = handle_sigp_dst(vcpu, order_code, cpu_addr,
	443	parameter,
	444	&vcpu->run->s.regs.gprs[r1]);
5288fbf0 CB	445	}
	446
	447	if (rc < 0)
	448	return rc;
	449
949c007a	450	kvm_s390_set_psw_cc(vcpu, rc);
5288fbf0 CB	451	return 0;
5288fbf0 CB	452	}
4953919f DH	453
	454	/*
	455	* Handle SIGP partial execution interception.
	456	*
	457	* This interception will occur at the source cpu when a source cpu sends an
	458	* external call to a target cpu and the target cpu has the WAIT bit set in
	459	* its cpuflags. Interception will occurr after the interrupt indicator bits at
	460	* the target cpu have been set. All error cases will lead to instruction
	461	* interception, therefore nothing is to be checked or prepared.
	462	*/
	463	int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu)
	464	{
	465	int r3 = vcpu->arch.sie_block->ipa & 0x000f;
	466	u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
	467	struct kvm_vcpu *dest_vcpu;
	468	u8 order_code = kvm_s390_get_base_disp_rs(vcpu);
	469
	470	trace_kvm_s390_handle_sigp_pei(vcpu, order_code, cpu_addr);
	471
	472	if (order_code == SIGP_EXTERNAL_CALL) {
	473	dest_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
	474	BUG_ON(dest_vcpu == NULL);
	475
0e9c85a5	476	kvm_s390_vcpu_wakeup(dest_vcpu);
4953919f DH	477	kvm_s390_set_psw_cc(vcpu, SIGP_CC_ORDER_CODE_ACCEPTED);
	478	return 0;
	479	}
	480
	481	return -EOPNOTSUPP;
	482	}