[deliverable/linux.git] / arch / s390 / kvm / intercept.c

/*
 * in-kernel handling for sie intercepts
 *
 * Copyright IBM Corp. 2008, 2014
 *
 * 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>
 */

#include <linux/kvm_host.h>
#include <linux/errno.h>
#include <linux/pagemap.h>

#include <asm/kvm_host.h>
#include <asm/asm-offsets.h>
#include <asm/irq.h>

#include "kvm-s390.h"
#include "gaccess.h"
#include "trace.h"
#include "trace-s390.h"


static const intercept_handler_t instruction_handlers[256] = {
	[0x01] = kvm_s390_handle_01,
	[0x82] = kvm_s390_handle_lpsw,
	[0x83] = kvm_s390_handle_diag,
	[0xae] = kvm_s390_handle_sigp,
	[0xb2] = kvm_s390_handle_b2,
	[0xb6] = kvm_s390_handle_stctl,
	[0xb7] = kvm_s390_handle_lctl,
	[0xb9] = kvm_s390_handle_b9,
	[0xe5] = kvm_s390_handle_e5,
	[0xeb] = kvm_s390_handle_eb,
};

void kvm_s390_rewind_psw(struct kvm_vcpu *vcpu, int ilc)
{
	struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;

	/* Use the length of the EXECUTE instruction if necessary */
	if (sie_block->icptstatus & 1) {
		ilc = (sie_block->icptstatus >> 4) & 0x6;
		if (!ilc)
			ilc = 4;
	}
	sie_block->gpsw.addr = __rewind_psw(sie_block->gpsw, ilc);
}

static int handle_noop(struct kvm_vcpu *vcpu)
{
	switch (vcpu->arch.sie_block->icptcode) {
	case 0x10:
		vcpu->stat.exit_external_request++;
		break;
	default:
		break; /* nothing */
	}
	return 0;
}

static int handle_stop(struct kvm_vcpu *vcpu)
{
	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
	int rc = 0;
	uint8_t flags, stop_pending;

	vcpu->stat.exit_stop_request++;

	/* delay the stop if any non-stop irq is pending */
	if (kvm_s390_vcpu_has_irq(vcpu, 1))
		return 0;

	/* avoid races with the injection/SIGP STOP code */
	spin_lock(&li->lock);
	flags = li->irq.stop.flags;
	stop_pending = kvm_s390_is_stop_irq_pending(vcpu);
	spin_unlock(&li->lock);

	trace_kvm_s390_stop_request(stop_pending, flags);
	if (!stop_pending)
		return 0;

	if (flags & KVM_S390_STOP_FLAG_STORE_STATUS) {
		rc = kvm_s390_vcpu_store_status(vcpu,
						KVM_S390_STORE_STATUS_NOADDR);
		if (rc)
			return rc;
	}

	if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
		kvm_s390_vcpu_stop(vcpu);
	return -EOPNOTSUPP;
}

static int handle_validity(struct kvm_vcpu *vcpu)
{
	int viwhy = vcpu->arch.sie_block->ipb >> 16;

	vcpu->stat.exit_validity++;
	trace_kvm_s390_intercept_validity(vcpu, viwhy);
	WARN_ONCE(true, "kvm: unhandled validity intercept 0x%x\n", viwhy);
	return -EOPNOTSUPP;
}

static int handle_instruction(struct kvm_vcpu *vcpu)
{
	intercept_handler_t handler;

	vcpu->stat.exit_instruction++;
	trace_kvm_s390_intercept_instruction(vcpu,
					     vcpu->arch.sie_block->ipa,
					     vcpu->arch.sie_block->ipb);
	handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8];
	if (handler)
		return handler(vcpu);
	return -EOPNOTSUPP;
}

static void __extract_prog_irq(struct kvm_vcpu *vcpu,
			       struct kvm_s390_pgm_info *pgm_info)
{
	memset(pgm_info, 0, sizeof(struct kvm_s390_pgm_info));
	pgm_info->code = vcpu->arch.sie_block->iprcc;

	switch (vcpu->arch.sie_block->iprcc & ~PGM_PER) {
	case PGM_AFX_TRANSLATION:
	case PGM_ASX_TRANSLATION:
	case PGM_EX_TRANSLATION:
	case PGM_LFX_TRANSLATION:
	case PGM_LSTE_SEQUENCE:
	case PGM_LSX_TRANSLATION:
	case PGM_LX_TRANSLATION:
	case PGM_PRIMARY_AUTHORITY:
	case PGM_SECONDARY_AUTHORITY:
	case PGM_SPACE_SWITCH:
		pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc;
		break;
	case PGM_ALEN_TRANSLATION:
	case PGM_ALE_SEQUENCE:
	case PGM_ASTE_INSTANCE:
	case PGM_ASTE_SEQUENCE:
	case PGM_ASTE_VALIDITY:
	case PGM_EXTENDED_AUTHORITY:
		pgm_info->exc_access_id = vcpu->arch.sie_block->eai;
		break;
	case PGM_ASCE_TYPE:
	case PGM_PAGE_TRANSLATION:
	case PGM_REGION_FIRST_TRANS:
	case PGM_REGION_SECOND_TRANS:
	case PGM_REGION_THIRD_TRANS:
	case PGM_SEGMENT_TRANSLATION:
		pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc;
		pgm_info->exc_access_id  = vcpu->arch.sie_block->eai;
		pgm_info->op_access_id  = vcpu->arch.sie_block->oai;
		break;
	case PGM_MONITOR:
		pgm_info->mon_class_nr = vcpu->arch.sie_block->mcn;
		pgm_info->mon_code = vcpu->arch.sie_block->tecmc;
		break;
	case PGM_VECTOR_PROCESSING:
	case PGM_DATA:
		pgm_info->data_exc_code = vcpu->arch.sie_block->dxc;
		break;
	case PGM_PROTECTION:
		pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc;
		pgm_info->exc_access_id  = vcpu->arch.sie_block->eai;
		break;
	default:
		break;
	}

	if (vcpu->arch.sie_block->iprcc & PGM_PER) {
		pgm_info->per_code = vcpu->arch.sie_block->perc;
		pgm_info->per_atmid = vcpu->arch.sie_block->peratmid;
		pgm_info->per_address = vcpu->arch.sie_block->peraddr;
		pgm_info->per_access_id = vcpu->arch.sie_block->peraid;
	}
}

/*
 * restore ITDB to program-interruption TDB in guest lowcore
 * and set TX abort indication if required
*/
static int handle_itdb(struct kvm_vcpu *vcpu)
{
	struct kvm_s390_itdb *itdb;
	int rc;

	if (!IS_TE_ENABLED(vcpu) || !IS_ITDB_VALID(vcpu))
		return 0;
	if (current->thread.per_flags & PER_FLAG_NO_TE)
		return 0;
	itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba;
	rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb));
	if (rc)
		return rc;
	memset(itdb, 0, sizeof(*itdb));

	return 0;
}

#define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER)

static int handle_prog(struct kvm_vcpu *vcpu)
{
	struct kvm_s390_pgm_info pgm_info;
	psw_t psw;
	int rc;

	vcpu->stat.exit_program_interruption++;

	if (guestdbg_enabled(vcpu) && per_event(vcpu)) {
		kvm_s390_handle_per_event(vcpu);
		/* the interrupt might have been filtered out completely */
		if (vcpu->arch.sie_block->iprcc == 0)
			return 0;
	}

	trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
	if (vcpu->arch.sie_block->iprcc == PGM_SPECIFICATION) {
		rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &psw, sizeof(psw_t));
		if (rc)
			return rc;
		/* Avoid endless loops of specification exceptions */
		if (!is_valid_psw(&psw))
			return -EOPNOTSUPP;
	}
	rc = handle_itdb(vcpu);
	if (rc)
		return rc;

	__extract_prog_irq(vcpu, &pgm_info);
	return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
}

/**
 * handle_external_interrupt - used for external interruption interceptions
 *
 * This interception only occurs if the CPUSTAT_EXT_INT bit was set, or if
 * the new PSW does not have external interrupts disabled. In the first case,
 * we've got to deliver the interrupt manually, and in the second case, we
 * drop to userspace to handle the situation there.
 */
static int handle_external_interrupt(struct kvm_vcpu *vcpu)
{
	u16 eic = vcpu->arch.sie_block->eic;
	struct kvm_s390_irq irq;
	psw_t newpsw;
	int rc;

	vcpu->stat.exit_external_interrupt++;

	rc = read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &newpsw, sizeof(psw_t));
	if (rc)
		return rc;
	/* We can not handle clock comparator or timer interrupt with bad PSW */
	if ((eic == EXT_IRQ_CLK_COMP || eic == EXT_IRQ_CPU_TIMER) &&
	    (newpsw.mask & PSW_MASK_EXT))
		return -EOPNOTSUPP;

	switch (eic) {
	case EXT_IRQ_CLK_COMP:
		irq.type = KVM_S390_INT_CLOCK_COMP;
		break;
	case EXT_IRQ_CPU_TIMER:
		irq.type = KVM_S390_INT_CPU_TIMER;
		break;
	case EXT_IRQ_EXTERNAL_CALL:
		irq.type = KVM_S390_INT_EXTERNAL_CALL;
		irq.u.extcall.code = vcpu->arch.sie_block->extcpuaddr;
		rc = kvm_s390_inject_vcpu(vcpu, &irq);
		/* ignore if another external call is already pending */
		if (rc == -EBUSY)
			return 0;
		return rc;
	default:
		return -EOPNOTSUPP;
	}

	return kvm_s390_inject_vcpu(vcpu, &irq);
}

/**
 * Handle MOVE PAGE partial execution interception.
 *
 * This interception can only happen for guests with DAT disabled and
 * addresses that are currently not mapped in the host. Thus we try to
 * set up the mappings for the corresponding user pages here (or throw
 * addressing exceptions in case of illegal guest addresses).
 */
static int handle_mvpg_pei(struct kvm_vcpu *vcpu)
{
	unsigned long srcaddr, dstaddr;
	int reg1, reg2, rc;

	kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);

	/* Make sure that the source is paged-in */
	rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg2],
				     reg2, &srcaddr, 0);
	if (rc)
		return kvm_s390_inject_prog_cond(vcpu, rc);
	rc = kvm_arch_fault_in_page(vcpu, srcaddr, 0);
	if (rc != 0)
		return rc;

	/* Make sure that the destination is paged-in */
	rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg1],
				     reg1, &dstaddr, 1);
	if (rc)
		return kvm_s390_inject_prog_cond(vcpu, rc);
	rc = kvm_arch_fault_in_page(vcpu, dstaddr, 1);
	if (rc != 0)
		return rc;

	kvm_s390_rewind_psw(vcpu, 4);

	return 0;
}

static int handle_partial_execution(struct kvm_vcpu *vcpu)
{
	if (vcpu->arch.sie_block->ipa == 0xb254)	/* MVPG */
		return handle_mvpg_pei(vcpu);
	if (vcpu->arch.sie_block->ipa >> 8 == 0xae)	/* SIGP */
		return kvm_s390_handle_sigp_pei(vcpu);

	return -EOPNOTSUPP;
}

int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
{
	if (kvm_is_ucontrol(vcpu->kvm))
		return -EOPNOTSUPP;

	switch (vcpu->arch.sie_block->icptcode) {
	case 0x10:
	case 0x18:
		return handle_noop(vcpu);
	case 0x04:
		return handle_instruction(vcpu);
	case 0x08:
		return handle_prog(vcpu);
	case 0x14:
		return handle_external_interrupt(vcpu);
	case 0x1c:
		return kvm_s390_handle_wait(vcpu);
	case 0x20:
		return handle_validity(vcpu);
	case 0x28:
		return handle_stop(vcpu);
	case 0x38:
		return handle_partial_execution(vcpu);
	default:
		return -EOPNOTSUPP;
	}
}
Commit	Line	Data
8f2abe6a	1	/*
a53c8fab	2	* in-kernel handling for sie intercepts
8f2abe6a	3	*
9a558ee3	4	* Copyright IBM Corp. 2008, 2014
8f2abe6a 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>
	12	*/
	13
	14	#include <linux/kvm_host.h>
	15	#include <linux/errno.h>
	16	#include <linux/pagemap.h>
	17
	18	#include <asm/kvm_host.h>
a86dcc24	19	#include <asm/asm-offsets.h>
f14d82e0	20	#include <asm/irq.h>
8f2abe6a CB	21
8f2abe6a CB	22	#include "kvm-s390.h"
ba5c1e9b	23	#include "gaccess.h"
5786fffa	24	#include "trace.h"
ade38c31	25	#include "trace-s390.h"
ba5c1e9b	26
f379aae5	27
77975357	28	static const intercept_handler_t instruction_handlers[256] = {
8c3f61e2	29	[0x01] = kvm_s390_handle_01,
48a3e950	30	[0x82] = kvm_s390_handle_lpsw,
e28acfea	31	[0x83] = kvm_s390_handle_diag,
5288fbf0	32	[0xae] = kvm_s390_handle_sigp,
70455a36	33	[0xb2] = kvm_s390_handle_b2,
aba07508	34	[0xb6] = kvm_s390_handle_stctl,
953ed88d	35	[0xb7] = kvm_s390_handle_lctl,
48a3e950	36	[0xb9] = kvm_s390_handle_b9,
bb25b9ba	37	[0xe5] = kvm_s390_handle_e5,
953ed88d	38	[0xeb] = kvm_s390_handle_eb,
ba5c1e9b	39	};
8f2abe6a	40
04b41acd TH	41	void kvm_s390_rewind_psw(struct kvm_vcpu *vcpu, int ilc)
	42	{
	43	struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
	44
	45	/* Use the length of the EXECUTE instruction if necessary */
	46	if (sie_block->icptstatus & 1) {
	47	ilc = (sie_block->icptstatus >> 4) & 0x6;
	48	if (!ilc)
	49	ilc = 4;
	50	}
	51	sie_block->gpsw.addr = __rewind_psw(sie_block->gpsw, ilc);
	52	}
	53
8f2abe6a CB	54	static int handle_noop(struct kvm_vcpu *vcpu)
	55	{
	56	switch (vcpu->arch.sie_block->icptcode) {
	57	case 0x10:
	58	vcpu->stat.exit_external_request++;
	59	break;
8f2abe6a CB	60	default:
	61	break; /* nothing */
	62	}
	63	return 0;
	64	}
	65
	66	static int handle_stop(struct kvm_vcpu *vcpu)
	67	{
6cddd432	68	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
9ace903d	69	int rc = 0;
6cddd432	70	uint8_t flags, stop_pending;
5288fbf0	71
8f2abe6a	72	vcpu->stat.exit_stop_request++;
ade38c31	73
9a022067 DH	74	/* delay the stop if any non-stop irq is pending */
	75	if (kvm_s390_vcpu_has_irq(vcpu, 1))
	76	return 0;
	77
6cddd432 DH	78	/* avoid races with the injection/SIGP STOP code */
	79	spin_lock(&li->lock);
	80	flags = li->irq.stop.flags;
	81	stop_pending = kvm_s390_is_stop_irq_pending(vcpu);
	82	spin_unlock(&li->lock);
32f5ff63	83
6cddd432 DH	84	trace_kvm_s390_stop_request(stop_pending, flags);
6cddd432 DH	85	if (!stop_pending)
32f5ff63	86	return 0;
9ace903d	87
6cddd432	88	if (flags & KVM_S390_STOP_FLAG_STORE_STATUS) {
9e0d5473 JF	89	rc = kvm_s390_vcpu_store_status(vcpu,
9e0d5473 JF	90	KVM_S390_STORE_STATUS_NOADDR);
32f5ff63 DH	91	if (rc)
	92	return rc;
	93	}
	94
6352e4d2 DH	95	if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
6352e4d2 DH	96	kvm_s390_vcpu_stop(vcpu);
32f5ff63	97	return -EOPNOTSUPP;
8f2abe6a CB	98	}
	99
	100	static int handle_validity(struct kvm_vcpu *vcpu)
	101	{
	102	int viwhy = vcpu->arch.sie_block->ipb >> 16;
3edbcff9	103
8f2abe6a	104	vcpu->stat.exit_validity++;
5786fffa	105	trace_kvm_s390_intercept_validity(vcpu, viwhy);
2c70fe44 CB	106	WARN_ONCE(true, "kvm: unhandled validity intercept 0x%x\n", viwhy);
2c70fe44 CB	107	return -EOPNOTSUPP;
8f2abe6a CB	108	}
8f2abe6a CB	109
ba5c1e9b CO	110	static int handle_instruction(struct kvm_vcpu *vcpu)
	111	{
	112	intercept_handler_t handler;
	113
	114	vcpu->stat.exit_instruction++;
5786fffa CH	115	trace_kvm_s390_intercept_instruction(vcpu,
	116	vcpu->arch.sie_block->ipa,
	117	vcpu->arch.sie_block->ipb);
ba5c1e9b CO	118	handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8];
	119	if (handler)
	120	return handler(vcpu);
b8e660b8	121	return -EOPNOTSUPP;
ba5c1e9b CO	122	}
ba5c1e9b CO	123
439716a5 DH	124	static void __extract_prog_irq(struct kvm_vcpu *vcpu,
	125	struct kvm_s390_pgm_info *pgm_info)
	126	{
	127	memset(pgm_info, 0, sizeof(struct kvm_s390_pgm_info));
	128	pgm_info->code = vcpu->arch.sie_block->iprcc;
	129
	130	switch (vcpu->arch.sie_block->iprcc & ~PGM_PER) {
	131	case PGM_AFX_TRANSLATION:
	132	case PGM_ASX_TRANSLATION:
	133	case PGM_EX_TRANSLATION:
	134	case PGM_LFX_TRANSLATION:
	135	case PGM_LSTE_SEQUENCE:
	136	case PGM_LSX_TRANSLATION:
	137	case PGM_LX_TRANSLATION:
	138	case PGM_PRIMARY_AUTHORITY:
	139	case PGM_SECONDARY_AUTHORITY:
	140	case PGM_SPACE_SWITCH:
	141	pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc;
	142	break;
	143	case PGM_ALEN_TRANSLATION:
	144	case PGM_ALE_SEQUENCE:
	145	case PGM_ASTE_INSTANCE:
	146	case PGM_ASTE_SEQUENCE:
	147	case PGM_ASTE_VALIDITY:
	148	case PGM_EXTENDED_AUTHORITY:
	149	pgm_info->exc_access_id = vcpu->arch.sie_block->eai;
	150	break;
	151	case PGM_ASCE_TYPE:
	152	case PGM_PAGE_TRANSLATION:
	153	case PGM_REGION_FIRST_TRANS:
	154	case PGM_REGION_SECOND_TRANS:
	155	case PGM_REGION_THIRD_TRANS:
	156	case PGM_SEGMENT_TRANSLATION:
	157	pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc;
	158	pgm_info->exc_access_id = vcpu->arch.sie_block->eai;
	159	pgm_info->op_access_id = vcpu->arch.sie_block->oai;
	160	break;
	161	case PGM_MONITOR:
	162	pgm_info->mon_class_nr = vcpu->arch.sie_block->mcn;
	163	pgm_info->mon_code = vcpu->arch.sie_block->tecmc;
	164	break;
403c8648	165	case PGM_VECTOR_PROCESSING:
439716a5 DH	166	case PGM_DATA:
	167	pgm_info->data_exc_code = vcpu->arch.sie_block->dxc;
	168	break;
	169	case PGM_PROTECTION:
	170	pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc;
	171	pgm_info->exc_access_id = vcpu->arch.sie_block->eai;
	172	break;
	173	default:
	174	break;
	175	}
	176
	177	if (vcpu->arch.sie_block->iprcc & PGM_PER) {
	178	pgm_info->per_code = vcpu->arch.sie_block->perc;
	179	pgm_info->per_atmid = vcpu->arch.sie_block->peratmid;
	180	pgm_info->per_address = vcpu->arch.sie_block->peraddr;
	181	pgm_info->per_access_id = vcpu->arch.sie_block->peraid;
	182	}
	183	}
	184
e325fe69 MM	185	/*
	186	* restore ITDB to program-interruption TDB in guest lowcore
	187	* and set TX abort indication if required
	188	*/
	189	static int handle_itdb(struct kvm_vcpu *vcpu)
	190	{
	191	struct kvm_s390_itdb *itdb;
	192	int rc;
	193
	194	if (!IS_TE_ENABLED(vcpu) \|\| !IS_ITDB_VALID(vcpu))
	195	return 0;
	196	if (current->thread.per_flags & PER_FLAG_NO_TE)
	197	return 0;
	198	itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba;
	199	rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb));
	200	if (rc)
	201	return rc;
	202	memset(itdb, 0, sizeof(*itdb));
	203
	204	return 0;
	205	}
	206
27291e21 DH	207	#define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER)
27291e21 DH	208
ba5c1e9b CO	209	static int handle_prog(struct kvm_vcpu *vcpu)
ba5c1e9b CO	210	{
439716a5	211	struct kvm_s390_pgm_info pgm_info;
684135e0	212	psw_t psw;
0040e7d2 HC	213	int rc;
0040e7d2 HC	214
ba5c1e9b	215	vcpu->stat.exit_program_interruption++;
7feb6bb8	216
27291e21 DH	217	if (guestdbg_enabled(vcpu) && per_event(vcpu)) {
	218	kvm_s390_handle_per_event(vcpu);
	219	/* the interrupt might have been filtered out completely */
	220	if (vcpu->arch.sie_block->iprcc == 0)
	221	return 0;
	222	}
	223
e325fe69	224	trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
684135e0 TH	225	if (vcpu->arch.sie_block->iprcc == PGM_SPECIFICATION) {
	226	rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &psw, sizeof(psw_t));
	227	if (rc)
	228	return rc;
	229	/* Avoid endless loops of specification exceptions */
	230	if (!is_valid_psw(&psw))
	231	return -EOPNOTSUPP;
	232	}
e325fe69	233	rc = handle_itdb(vcpu);
0040e7d2 HC	234	if (rc)
0040e7d2 HC	235	return rc;
439716a5	236
e325fe69	237	__extract_prog_irq(vcpu, &pgm_info);
439716a5	238	return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
ba5c1e9b CO	239	}
ba5c1e9b CO	240
f14d82e0 TH	241	/**
	242	* handle_external_interrupt - used for external interruption interceptions
	243	*
	244	* This interception only occurs if the CPUSTAT_EXT_INT bit was set, or if
	245	* the new PSW does not have external interrupts disabled. In the first case,
	246	* we've got to deliver the interrupt manually, and in the second case, we
	247	* drop to userspace to handle the situation there.
	248	*/
	249	static int handle_external_interrupt(struct kvm_vcpu *vcpu)
	250	{
	251	u16 eic = vcpu->arch.sie_block->eic;
383d0b05	252	struct kvm_s390_irq irq;
f14d82e0 TH	253	psw_t newpsw;
	254	int rc;
	255
	256	vcpu->stat.exit_external_interrupt++;
	257
	258	rc = read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &newpsw, sizeof(psw_t));
	259	if (rc)
	260	return rc;
	261	/* We can not handle clock comparator or timer interrupt with bad PSW */
	262	if ((eic == EXT_IRQ_CLK_COMP \|\| eic == EXT_IRQ_CPU_TIMER) &&
	263	(newpsw.mask & PSW_MASK_EXT))
	264	return -EOPNOTSUPP;
	265
	266	switch (eic) {
	267	case EXT_IRQ_CLK_COMP:
	268	irq.type = KVM_S390_INT_CLOCK_COMP;
	269	break;
	270	case EXT_IRQ_CPU_TIMER:
	271	irq.type = KVM_S390_INT_CPU_TIMER;
	272	break;
	273	case EXT_IRQ_EXTERNAL_CALL:
	274	irq.type = KVM_S390_INT_EXTERNAL_CALL;
383d0b05	275	irq.u.extcall.code = vcpu->arch.sie_block->extcpuaddr;
ea5f4969 DH	276	rc = kvm_s390_inject_vcpu(vcpu, &irq);
	277	/* ignore if another external call is already pending */
	278	if (rc == -EBUSY)
	279	return 0;
	280	return rc;
f14d82e0 TH	281	default:
	282	return -EOPNOTSUPP;
	283	}
	284
	285	return kvm_s390_inject_vcpu(vcpu, &irq);
	286	}
	287
9a558ee3 TH	288	/**
	289	* Handle MOVE PAGE partial execution interception.
	290	*
	291	* This interception can only happen for guests with DAT disabled and
	292	* addresses that are currently not mapped in the host. Thus we try to
	293	* set up the mappings for the corresponding user pages here (or throw
	294	* addressing exceptions in case of illegal guest addresses).
	295	*/
	296	static int handle_mvpg_pei(struct kvm_vcpu *vcpu)
	297	{
f22166dc	298	unsigned long srcaddr, dstaddr;
9a558ee3 TH	299	int reg1, reg2, rc;
	300
	301	kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
9a558ee3 TH	302
9a558ee3 TH	303	/* Make sure that the source is paged-in */
3cfad023	304	rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg2],
8ae04b8f	305	reg2, &srcaddr, 0);
3cfad023 TH	306	if (rc)
3cfad023 TH	307	return kvm_s390_inject_prog_cond(vcpu, rc);
f22166dc TH	308	rc = kvm_arch_fault_in_page(vcpu, srcaddr, 0);
f22166dc TH	309	if (rc != 0)
9a558ee3 TH	310	return rc;
	311
	312	/* Make sure that the destination is paged-in */
3cfad023	313	rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg1],
8ae04b8f	314	reg1, &dstaddr, 1);
3cfad023 TH	315	if (rc)
3cfad023 TH	316	return kvm_s390_inject_prog_cond(vcpu, rc);
f22166dc TH	317	rc = kvm_arch_fault_in_page(vcpu, dstaddr, 1);
f22166dc TH	318	if (rc != 0)
9a558ee3 TH	319	return rc;
9a558ee3 TH	320
04b41acd	321	kvm_s390_rewind_psw(vcpu, 4);
9a558ee3 TH	322
	323	return 0;
	324	}
	325
	326	static int handle_partial_execution(struct kvm_vcpu *vcpu)
	327	{
	328	if (vcpu->arch.sie_block->ipa == 0xb254) /* MVPG */
	329	return handle_mvpg_pei(vcpu);
4953919f DH	330	if (vcpu->arch.sie_block->ipa >> 8 == 0xae) /* SIGP */
4953919f DH	331	return kvm_s390_handle_sigp_pei(vcpu);
9a558ee3 TH	332
	333	return -EOPNOTSUPP;
	334	}
	335
8f2abe6a CB	336	int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
8f2abe6a CB	337	{
71f116bf DH	338	if (kvm_is_ucontrol(vcpu->kvm))
	339	return -EOPNOTSUPP;
	340
46b708ea	341	switch (vcpu->arch.sie_block->icptcode) {
46b708ea CB	342	case 0x10:
	343	case 0x18:
	344	return handle_noop(vcpu);
	345	case 0x04:
	346	return handle_instruction(vcpu);
	347	case 0x08:
	348	return handle_prog(vcpu);
	349	case 0x14:
	350	return handle_external_interrupt(vcpu);
	351	case 0x1c:
	352	return kvm_s390_handle_wait(vcpu);
	353	case 0x20:
	354	return handle_validity(vcpu);
	355	case 0x28:
	356	return handle_stop(vcpu);
	357	case 0x38:
	358	return handle_partial_execution(vcpu);
	359	default:
b8e660b8	360	return -EOPNOTSUPP;
46b708ea	361	}
8f2abe6a	362	}