[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,
};

u8 kvm_s390_get_ilen(struct kvm_vcpu *vcpu)
{
	struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
	u8 ilen = 0;

	switch (vcpu->arch.sie_block->icptcode) {
	case ICPT_INST:
	case ICPT_INSTPROGI:
	case ICPT_OPEREXC:
	case ICPT_PARTEXEC:
	case ICPT_IOINST:
		/* instruction only stored for these icptcodes */
		ilen = insn_length(vcpu->arch.sie_block->ipa >> 8);
		/* Use the length of the EXECUTE instruction if necessary */
		if (sie_block->icptstatus & 1) {
			ilen = (sie_block->icptstatus >> 4) & 0x6;
			if (!ilen)
				ilen = 4;
		}
		break;
	case ICPT_PROGI:
		/* bit 1+2 of pgmilc are the ilc, so we directly get ilen */
		ilen = vcpu->arch.sie_block->pgmilc & 0x6;
		break;
	}
	return ilen;
}

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 int inject_prog_on_prog_intercept(struct kvm_vcpu *vcpu)
{
	struct kvm_s390_pgm_info pgm_info = {
		.code = vcpu->arch.sie_block->iprcc,
		/* the PSW has already been rewound */
		.flags = KVM_S390_PGM_FLAGS_NO_REWIND,
	};

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

/*
 * 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)
{
	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;

	return inject_prog_on_prog_intercept(vcpu);
}

/**
 * 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, GACC_FETCH);
	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, GACC_STORE);
	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_retry_instr(vcpu);

	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
0e8bc06a	41	u8 kvm_s390_get_ilen(struct kvm_vcpu *vcpu)
04b41acd TH	42	{
04b41acd TH	43	struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
0e8bc06a	44	u8 ilen = 0;
04b41acd	45
0e8bc06a DH	46	switch (vcpu->arch.sie_block->icptcode) {
	47	case ICPT_INST:
	48	case ICPT_INSTPROGI:
	49	case ICPT_OPEREXC:
	50	case ICPT_PARTEXEC:
	51	case ICPT_IOINST:
	52	/* instruction only stored for these icptcodes */
	53	ilen = insn_length(vcpu->arch.sie_block->ipa >> 8);
	54	/* Use the length of the EXECUTE instruction if necessary */
	55	if (sie_block->icptstatus & 1) {
	56	ilen = (sie_block->icptstatus >> 4) & 0x6;
	57	if (!ilen)
	58	ilen = 4;
	59	}
	60	break;
	61	case ICPT_PROGI:
	62	/* bit 1+2 of pgmilc are the ilc, so we directly get ilen */
	63	ilen = vcpu->arch.sie_block->pgmilc & 0x6;
	64	break;
04b41acd	65	}
0e8bc06a	66	return ilen;
04b41acd TH	67	}
04b41acd TH	68
8f2abe6a CB	69	static int handle_noop(struct kvm_vcpu *vcpu)
	70	{
	71	switch (vcpu->arch.sie_block->icptcode) {
	72	case 0x10:
	73	vcpu->stat.exit_external_request++;
	74	break;
8f2abe6a CB	75	default:
	76	break; /* nothing */
	77	}
	78	return 0;
	79	}
	80
	81	static int handle_stop(struct kvm_vcpu *vcpu)
	82	{
6cddd432	83	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
9ace903d	84	int rc = 0;
6cddd432	85	uint8_t flags, stop_pending;
5288fbf0	86
8f2abe6a	87	vcpu->stat.exit_stop_request++;
ade38c31	88
9a022067 DH	89	/* delay the stop if any non-stop irq is pending */
	90	if (kvm_s390_vcpu_has_irq(vcpu, 1))
	91	return 0;
	92
6cddd432 DH	93	/* avoid races with the injection/SIGP STOP code */
	94	spin_lock(&li->lock);
	95	flags = li->irq.stop.flags;
	96	stop_pending = kvm_s390_is_stop_irq_pending(vcpu);
	97	spin_unlock(&li->lock);
32f5ff63	98
6cddd432 DH	99	trace_kvm_s390_stop_request(stop_pending, flags);
6cddd432 DH	100	if (!stop_pending)
32f5ff63	101	return 0;
9ace903d	102
6cddd432	103	if (flags & KVM_S390_STOP_FLAG_STORE_STATUS) {
9e0d5473 JF	104	rc = kvm_s390_vcpu_store_status(vcpu,
9e0d5473 JF	105	KVM_S390_STORE_STATUS_NOADDR);
32f5ff63 DH	106	if (rc)
	107	return rc;
	108	}
	109
6352e4d2 DH	110	if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
6352e4d2 DH	111	kvm_s390_vcpu_stop(vcpu);
32f5ff63	112	return -EOPNOTSUPP;
8f2abe6a CB	113	}
	114
	115	static int handle_validity(struct kvm_vcpu *vcpu)
	116	{
	117	int viwhy = vcpu->arch.sie_block->ipb >> 16;
3edbcff9	118
8f2abe6a	119	vcpu->stat.exit_validity++;
5786fffa	120	trace_kvm_s390_intercept_validity(vcpu, viwhy);
2c70fe44 CB	121	WARN_ONCE(true, "kvm: unhandled validity intercept 0x%x\n", viwhy);
2c70fe44 CB	122	return -EOPNOTSUPP;
8f2abe6a CB	123	}
8f2abe6a CB	124
ba5c1e9b CO	125	static int handle_instruction(struct kvm_vcpu *vcpu)
	126	{
	127	intercept_handler_t handler;
	128
	129	vcpu->stat.exit_instruction++;
5786fffa CH	130	trace_kvm_s390_intercept_instruction(vcpu,
	131	vcpu->arch.sie_block->ipa,
	132	vcpu->arch.sie_block->ipb);
ba5c1e9b CO	133	handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8];
	134	if (handler)
	135	return handler(vcpu);
b8e660b8	136	return -EOPNOTSUPP;
ba5c1e9b CO	137	}
ba5c1e9b CO	138
f6af84e7	139	static int inject_prog_on_prog_intercept(struct kvm_vcpu *vcpu)
439716a5	140	{
f6af84e7 DH	141	struct kvm_s390_pgm_info pgm_info = {
f6af84e7 DH	142	.code = vcpu->arch.sie_block->iprcc,
eaa4f416 DH	143	/* the PSW has already been rewound */
eaa4f416 DH	144	.flags = KVM_S390_PGM_FLAGS_NO_REWIND,
f6af84e7	145	};
439716a5 DH	146
	147	switch (vcpu->arch.sie_block->iprcc & ~PGM_PER) {
	148	case PGM_AFX_TRANSLATION:
	149	case PGM_ASX_TRANSLATION:
	150	case PGM_EX_TRANSLATION:
	151	case PGM_LFX_TRANSLATION:
	152	case PGM_LSTE_SEQUENCE:
	153	case PGM_LSX_TRANSLATION:
	154	case PGM_LX_TRANSLATION:
	155	case PGM_PRIMARY_AUTHORITY:
	156	case PGM_SECONDARY_AUTHORITY:
	157	case PGM_SPACE_SWITCH:
f6af84e7	158	pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
439716a5 DH	159	break;
	160	case PGM_ALEN_TRANSLATION:
	161	case PGM_ALE_SEQUENCE:
	162	case PGM_ASTE_INSTANCE:
	163	case PGM_ASTE_SEQUENCE:
	164	case PGM_ASTE_VALIDITY:
	165	case PGM_EXTENDED_AUTHORITY:
f6af84e7	166	pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
439716a5 DH	167	break;
	168	case PGM_ASCE_TYPE:
	169	case PGM_PAGE_TRANSLATION:
	170	case PGM_REGION_FIRST_TRANS:
	171	case PGM_REGION_SECOND_TRANS:
	172	case PGM_REGION_THIRD_TRANS:
	173	case PGM_SEGMENT_TRANSLATION:
f6af84e7 DH	174	pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
	175	pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
	176	pgm_info.op_access_id = vcpu->arch.sie_block->oai;
439716a5 DH	177	break;
439716a5 DH	178	case PGM_MONITOR:
f6af84e7 DH	179	pgm_info.mon_class_nr = vcpu->arch.sie_block->mcn;
f6af84e7 DH	180	pgm_info.mon_code = vcpu->arch.sie_block->tecmc;
439716a5	181	break;
403c8648	182	case PGM_VECTOR_PROCESSING:
439716a5	183	case PGM_DATA:
f6af84e7	184	pgm_info.data_exc_code = vcpu->arch.sie_block->dxc;
439716a5 DH	185	break;
439716a5 DH	186	case PGM_PROTECTION:
f6af84e7 DH	187	pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
f6af84e7 DH	188	pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
439716a5 DH	189	break;
	190	default:
	191	break;
	192	}
	193
	194	if (vcpu->arch.sie_block->iprcc & PGM_PER) {
f6af84e7 DH	195	pgm_info.per_code = vcpu->arch.sie_block->perc;
	196	pgm_info.per_atmid = vcpu->arch.sie_block->peratmid;
	197	pgm_info.per_address = vcpu->arch.sie_block->peraddr;
	198	pgm_info.per_access_id = vcpu->arch.sie_block->peraid;
439716a5	199	}
f6af84e7	200	return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
439716a5 DH	201	}
439716a5 DH	202
e325fe69 MM	203	/*
	204	* restore ITDB to program-interruption TDB in guest lowcore
	205	* and set TX abort indication if required
	206	*/
	207	static int handle_itdb(struct kvm_vcpu *vcpu)
	208	{
	209	struct kvm_s390_itdb *itdb;
	210	int rc;
	211
	212	if (!IS_TE_ENABLED(vcpu) \|\| !IS_ITDB_VALID(vcpu))
	213	return 0;
	214	if (current->thread.per_flags & PER_FLAG_NO_TE)
	215	return 0;
	216	itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba;
	217	rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb));
	218	if (rc)
	219	return rc;
	220	memset(itdb, 0, sizeof(*itdb));
	221
	222	return 0;
	223	}
	224
27291e21 DH	225	#define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER)
27291e21 DH	226
ba5c1e9b CO	227	static int handle_prog(struct kvm_vcpu *vcpu)
ba5c1e9b CO	228	{
684135e0	229	psw_t psw;
0040e7d2 HC	230	int rc;
0040e7d2 HC	231
ba5c1e9b	232	vcpu->stat.exit_program_interruption++;
7feb6bb8	233
27291e21 DH	234	if (guestdbg_enabled(vcpu) && per_event(vcpu)) {
	235	kvm_s390_handle_per_event(vcpu);
	236	/* the interrupt might have been filtered out completely */
	237	if (vcpu->arch.sie_block->iprcc == 0)
	238	return 0;
	239	}
	240
e325fe69	241	trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
684135e0 TH	242	if (vcpu->arch.sie_block->iprcc == PGM_SPECIFICATION) {
	243	rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &psw, sizeof(psw_t));
	244	if (rc)
	245	return rc;
	246	/* Avoid endless loops of specification exceptions */
	247	if (!is_valid_psw(&psw))
	248	return -EOPNOTSUPP;
	249	}
e325fe69	250	rc = handle_itdb(vcpu);
0040e7d2 HC	251	if (rc)
0040e7d2 HC	252	return rc;
439716a5	253
f6af84e7	254	return inject_prog_on_prog_intercept(vcpu);
ba5c1e9b CO	255	}
ba5c1e9b CO	256
f14d82e0 TH	257	/**
	258	* handle_external_interrupt - used for external interruption interceptions
	259	*
	260	* This interception only occurs if the CPUSTAT_EXT_INT bit was set, or if
	261	* the new PSW does not have external interrupts disabled. In the first case,
	262	* we've got to deliver the interrupt manually, and in the second case, we
	263	* drop to userspace to handle the situation there.
	264	*/
	265	static int handle_external_interrupt(struct kvm_vcpu *vcpu)
	266	{
	267	u16 eic = vcpu->arch.sie_block->eic;
383d0b05	268	struct kvm_s390_irq irq;
f14d82e0 TH	269	psw_t newpsw;
	270	int rc;
	271
	272	vcpu->stat.exit_external_interrupt++;
	273
	274	rc = read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &newpsw, sizeof(psw_t));
	275	if (rc)
	276	return rc;
	277	/* We can not handle clock comparator or timer interrupt with bad PSW */
	278	if ((eic == EXT_IRQ_CLK_COMP \|\| eic == EXT_IRQ_CPU_TIMER) &&
	279	(newpsw.mask & PSW_MASK_EXT))
	280	return -EOPNOTSUPP;
	281
	282	switch (eic) {
	283	case EXT_IRQ_CLK_COMP:
	284	irq.type = KVM_S390_INT_CLOCK_COMP;
	285	break;
	286	case EXT_IRQ_CPU_TIMER:
	287	irq.type = KVM_S390_INT_CPU_TIMER;
	288	break;
	289	case EXT_IRQ_EXTERNAL_CALL:
	290	irq.type = KVM_S390_INT_EXTERNAL_CALL;
383d0b05	291	irq.u.extcall.code = vcpu->arch.sie_block->extcpuaddr;
ea5f4969 DH	292	rc = kvm_s390_inject_vcpu(vcpu, &irq);
	293	/* ignore if another external call is already pending */
	294	if (rc == -EBUSY)
	295	return 0;
	296	return rc;
f14d82e0 TH	297	default:
	298	return -EOPNOTSUPP;
	299	}
	300
	301	return kvm_s390_inject_vcpu(vcpu, &irq);
	302	}
	303
9a558ee3 TH	304	/**
	305	* Handle MOVE PAGE partial execution interception.
	306	*
	307	* This interception can only happen for guests with DAT disabled and
	308	* addresses that are currently not mapped in the host. Thus we try to
	309	* set up the mappings for the corresponding user pages here (or throw
	310	* addressing exceptions in case of illegal guest addresses).
	311	*/
	312	static int handle_mvpg_pei(struct kvm_vcpu *vcpu)
	313	{
f22166dc	314	unsigned long srcaddr, dstaddr;
9a558ee3 TH	315	int reg1, reg2, rc;
	316
	317	kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
9a558ee3 TH	318
9a558ee3 TH	319	/* Make sure that the source is paged-in */
3cfad023	320	rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg2],
92c96321	321	reg2, &srcaddr, GACC_FETCH);
3cfad023 TH	322	if (rc)
3cfad023 TH	323	return kvm_s390_inject_prog_cond(vcpu, rc);
f22166dc TH	324	rc = kvm_arch_fault_in_page(vcpu, srcaddr, 0);
f22166dc TH	325	if (rc != 0)
9a558ee3 TH	326	return rc;
	327
	328	/* Make sure that the destination is paged-in */
3cfad023	329	rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg1],
92c96321	330	reg1, &dstaddr, GACC_STORE);
3cfad023 TH	331	if (rc)
3cfad023 TH	332	return kvm_s390_inject_prog_cond(vcpu, rc);
f22166dc TH	333	rc = kvm_arch_fault_in_page(vcpu, dstaddr, 1);
f22166dc TH	334	if (rc != 0)
9a558ee3 TH	335	return rc;
9a558ee3 TH	336
0e8bc06a	337	kvm_s390_retry_instr(vcpu);
9a558ee3 TH	338
	339	return 0;
	340	}
	341
	342	static int handle_partial_execution(struct kvm_vcpu *vcpu)
	343	{
	344	if (vcpu->arch.sie_block->ipa == 0xb254) /* MVPG */
	345	return handle_mvpg_pei(vcpu);
4953919f DH	346	if (vcpu->arch.sie_block->ipa >> 8 == 0xae) /* SIGP */
4953919f DH	347	return kvm_s390_handle_sigp_pei(vcpu);
9a558ee3 TH	348
	349	return -EOPNOTSUPP;
	350	}
	351
8f2abe6a CB	352	int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
8f2abe6a CB	353	{
71f116bf DH	354	if (kvm_is_ucontrol(vcpu->kvm))
	355	return -EOPNOTSUPP;
	356
46b708ea	357	switch (vcpu->arch.sie_block->icptcode) {
46b708ea CB	358	case 0x10:
	359	case 0x18:
	360	return handle_noop(vcpu);
	361	case 0x04:
	362	return handle_instruction(vcpu);
	363	case 0x08:
	364	return handle_prog(vcpu);
	365	case 0x14:
	366	return handle_external_interrupt(vcpu);
	367	case 0x1c:
	368	return kvm_s390_handle_wait(vcpu);
	369	case 0x20:
	370	return handle_validity(vcpu);
	371	case 0x28:
	372	return handle_stop(vcpu);
	373	case 0x38:
	374	return handle_partial_execution(vcpu);
	375	default:
b8e660b8	376	return -EOPNOTSUPP;
46b708ea	377	}
8f2abe6a	378	}