[linux-block.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 0x0:
		vcpu->stat.exit_null++;
		break;
	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_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);
}

static int handle_instruction_and_prog(struct kvm_vcpu *vcpu)
{
	int rc, rc2;

	vcpu->stat.exit_instr_and_program++;
	rc = handle_instruction(vcpu);
	rc2 = handle_prog(vcpu);

	if (rc == -EOPNOTSUPP)
		vcpu->arch.sie_block->icptcode = 0x04;
	if (rc)
		return rc;
	return rc2;
}

/**
 * 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:
		if (kvm_s390_si_ext_call_pending(vcpu))
			return 0;
		irq.type = KVM_S390_INT_EXTERNAL_CALL;
		irq.u.extcall.code = vcpu->arch.sie_block->extcpuaddr;
		break;
	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 */
	srcaddr = kvm_s390_real_to_abs(vcpu, vcpu->run->s.regs.gprs[reg2]);
	if (kvm_is_error_gpa(vcpu->kvm, srcaddr))
		return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
	rc = kvm_arch_fault_in_page(vcpu, srcaddr, 0);
	if (rc != 0)
		return rc;

	/* Make sure that the destination is paged-in */
	dstaddr = kvm_s390_real_to_abs(vcpu, vcpu->run->s.regs.gprs[reg1]);
	if (kvm_is_error_gpa(vcpu->kvm, dstaddr))
		return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
	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;
}

static const intercept_handler_t intercept_funcs[] = {
	[0x00 >> 2] = handle_noop,
	[0x04 >> 2] = handle_instruction,
	[0x08 >> 2] = handle_prog,
	[0x0C >> 2] = handle_instruction_and_prog,
	[0x10 >> 2] = handle_noop,
	[0x14 >> 2] = handle_external_interrupt,
	[0x18 >> 2] = handle_noop,
	[0x1C >> 2] = kvm_s390_handle_wait,
	[0x20 >> 2] = handle_validity,
	[0x28 >> 2] = handle_stop,
	[0x38 >> 2] = handle_partial_execution,
};

int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
{
	intercept_handler_t func;
	u8 code = vcpu->arch.sie_block->icptcode;

	if (code & 3 || (code >> 2) >= ARRAY_SIZE(intercept_funcs))
		return -EOPNOTSUPP;
	func = intercept_funcs[code >> 2];
	if (func)
		return func(vcpu);
	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) {
0eaeafa1 CB	57	case 0x0:
	58	vcpu->stat.exit_null++;
	59	break;
8f2abe6a CB	60	case 0x10:
	61	vcpu->stat.exit_external_request++;
	62	break;
8f2abe6a CB	63	default:
	64	break; /* nothing */
	65	}
	66	return 0;
	67	}
	68
	69	static int handle_stop(struct kvm_vcpu *vcpu)
	70	{
6cddd432	71	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
9ace903d	72	int rc = 0;
6cddd432	73	uint8_t flags, stop_pending;
5288fbf0	74
8f2abe6a	75	vcpu->stat.exit_stop_request++;
ade38c31	76
9a022067 DH	77	/* delay the stop if any non-stop irq is pending */
	78	if (kvm_s390_vcpu_has_irq(vcpu, 1))
	79	return 0;
	80
6cddd432 DH	81	/* avoid races with the injection/SIGP STOP code */
	82	spin_lock(&li->lock);
	83	flags = li->irq.stop.flags;
	84	stop_pending = kvm_s390_is_stop_irq_pending(vcpu);
	85	spin_unlock(&li->lock);
32f5ff63	86
6cddd432 DH	87	trace_kvm_s390_stop_request(stop_pending, flags);
6cddd432 DH	88	if (!stop_pending)
32f5ff63	89	return 0;
9ace903d	90
6cddd432	91	if (flags & KVM_S390_STOP_FLAG_STORE_STATUS) {
9e0d5473 JF	92	rc = kvm_s390_vcpu_store_status(vcpu,
9e0d5473 JF	93	KVM_S390_STORE_STATUS_NOADDR);
32f5ff63 DH	94	if (rc)
	95	return rc;
	96	}
	97
6352e4d2 DH	98	if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
6352e4d2 DH	99	kvm_s390_vcpu_stop(vcpu);
32f5ff63	100	return -EOPNOTSUPP;
8f2abe6a CB	101	}
	102
	103	static int handle_validity(struct kvm_vcpu *vcpu)
	104	{
	105	int viwhy = vcpu->arch.sie_block->ipb >> 16;
3edbcff9	106
8f2abe6a	107	vcpu->stat.exit_validity++;
5786fffa	108	trace_kvm_s390_intercept_validity(vcpu, viwhy);
2c70fe44 CB	109	WARN_ONCE(true, "kvm: unhandled validity intercept 0x%x\n", viwhy);
2c70fe44 CB	110	return -EOPNOTSUPP;
8f2abe6a CB	111	}
8f2abe6a CB	112
ba5c1e9b CO	113	static int handle_instruction(struct kvm_vcpu *vcpu)
	114	{
	115	intercept_handler_t handler;
	116
	117	vcpu->stat.exit_instruction++;
5786fffa CH	118	trace_kvm_s390_intercept_instruction(vcpu,
	119	vcpu->arch.sie_block->ipa,
	120	vcpu->arch.sie_block->ipb);
ba5c1e9b CO	121	handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8];
	122	if (handler)
	123	return handler(vcpu);
b8e660b8	124	return -EOPNOTSUPP;
ba5c1e9b CO	125	}
ba5c1e9b CO	126
439716a5 DH	127	static void __extract_prog_irq(struct kvm_vcpu *vcpu,
	128	struct kvm_s390_pgm_info *pgm_info)
	129	{
	130	memset(pgm_info, 0, sizeof(struct kvm_s390_pgm_info));
	131	pgm_info->code = vcpu->arch.sie_block->iprcc;
	132
	133	switch (vcpu->arch.sie_block->iprcc & ~PGM_PER) {
	134	case PGM_AFX_TRANSLATION:
	135	case PGM_ASX_TRANSLATION:
	136	case PGM_EX_TRANSLATION:
	137	case PGM_LFX_TRANSLATION:
	138	case PGM_LSTE_SEQUENCE:
	139	case PGM_LSX_TRANSLATION:
	140	case PGM_LX_TRANSLATION:
	141	case PGM_PRIMARY_AUTHORITY:
	142	case PGM_SECONDARY_AUTHORITY:
	143	case PGM_SPACE_SWITCH:
	144	pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc;
	145	break;
	146	case PGM_ALEN_TRANSLATION:
	147	case PGM_ALE_SEQUENCE:
	148	case PGM_ASTE_INSTANCE:
	149	case PGM_ASTE_SEQUENCE:
	150	case PGM_ASTE_VALIDITY:
	151	case PGM_EXTENDED_AUTHORITY:
	152	pgm_info->exc_access_id = vcpu->arch.sie_block->eai;
	153	break;
	154	case PGM_ASCE_TYPE:
	155	case PGM_PAGE_TRANSLATION:
	156	case PGM_REGION_FIRST_TRANS:
	157	case PGM_REGION_SECOND_TRANS:
	158	case PGM_REGION_THIRD_TRANS:
	159	case PGM_SEGMENT_TRANSLATION:
	160	pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc;
	161	pgm_info->exc_access_id = vcpu->arch.sie_block->eai;
	162	pgm_info->op_access_id = vcpu->arch.sie_block->oai;
	163	break;
	164	case PGM_MONITOR:
	165	pgm_info->mon_class_nr = vcpu->arch.sie_block->mcn;
	166	pgm_info->mon_code = vcpu->arch.sie_block->tecmc;
	167	break;
	168	case PGM_DATA:
	169	pgm_info->data_exc_code = vcpu->arch.sie_block->dxc;
	170	break;
	171	case PGM_PROTECTION:
	172	pgm_info->trans_exc_code = vcpu->arch.sie_block->tecmc;
	173	pgm_info->exc_access_id = vcpu->arch.sie_block->eai;
	174	break;
	175	default:
	176	break;
	177	}
	178
	179	if (vcpu->arch.sie_block->iprcc & PGM_PER) {
	180	pgm_info->per_code = vcpu->arch.sie_block->perc;
	181	pgm_info->per_atmid = vcpu->arch.sie_block->peratmid;
	182	pgm_info->per_address = vcpu->arch.sie_block->peraddr;
	183	pgm_info->per_access_id = vcpu->arch.sie_block->peraid;
	184	}
	185	}
	186
e325fe69 MM	187	/*
	188	* restore ITDB to program-interruption TDB in guest lowcore
	189	* and set TX abort indication if required
	190	*/
	191	static int handle_itdb(struct kvm_vcpu *vcpu)
	192	{
	193	struct kvm_s390_itdb *itdb;
	194	int rc;
	195
	196	if (!IS_TE_ENABLED(vcpu) \|\| !IS_ITDB_VALID(vcpu))
	197	return 0;
	198	if (current->thread.per_flags & PER_FLAG_NO_TE)
	199	return 0;
	200	itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba;
	201	rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb));
	202	if (rc)
	203	return rc;
	204	memset(itdb, 0, sizeof(*itdb));
	205
	206	return 0;
	207	}
	208
27291e21 DH	209	#define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER)
27291e21 DH	210
ba5c1e9b CO	211	static int handle_prog(struct kvm_vcpu *vcpu)
ba5c1e9b CO	212	{
439716a5	213	struct kvm_s390_pgm_info pgm_info;
684135e0	214	psw_t psw;
0040e7d2 HC	215	int rc;
0040e7d2 HC	216
ba5c1e9b	217	vcpu->stat.exit_program_interruption++;
7feb6bb8	218
27291e21 DH	219	if (guestdbg_enabled(vcpu) && per_event(vcpu)) {
	220	kvm_s390_handle_per_event(vcpu);
	221	/* the interrupt might have been filtered out completely */
	222	if (vcpu->arch.sie_block->iprcc == 0)
	223	return 0;
	224	}
	225
e325fe69	226	trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
684135e0 TH	227	if (vcpu->arch.sie_block->iprcc == PGM_SPECIFICATION) {
	228	rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &psw, sizeof(psw_t));
	229	if (rc)
	230	return rc;
	231	/* Avoid endless loops of specification exceptions */
	232	if (!is_valid_psw(&psw))
	233	return -EOPNOTSUPP;
	234	}
e325fe69	235	rc = handle_itdb(vcpu);
0040e7d2 HC	236	if (rc)
0040e7d2 HC	237	return rc;
439716a5	238
e325fe69	239	__extract_prog_irq(vcpu, &pgm_info);
439716a5	240	return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
ba5c1e9b CO	241	}
	242
	243	static int handle_instruction_and_prog(struct kvm_vcpu *vcpu)
	244	{
	245	int rc, rc2;
	246
	247	vcpu->stat.exit_instr_and_program++;
	248	rc = handle_instruction(vcpu);
	249	rc2 = handle_prog(vcpu);
	250
b8e660b8	251	if (rc == -EOPNOTSUPP)
ba5c1e9b CO	252	vcpu->arch.sie_block->icptcode = 0x04;
	253	if (rc)
	254	return rc;
	255	return rc2;
	256	}
	257
f14d82e0 TH	258	/**
	259	* handle_external_interrupt - used for external interruption interceptions
	260	*
	261	* This interception only occurs if the CPUSTAT_EXT_INT bit was set, or if
	262	* the new PSW does not have external interrupts disabled. In the first case,
	263	* we've got to deliver the interrupt manually, and in the second case, we
	264	* drop to userspace to handle the situation there.
	265	*/
	266	static int handle_external_interrupt(struct kvm_vcpu *vcpu)
	267	{
	268	u16 eic = vcpu->arch.sie_block->eic;
383d0b05	269	struct kvm_s390_irq irq;
f14d82e0 TH	270	psw_t newpsw;
	271	int rc;
	272
	273	vcpu->stat.exit_external_interrupt++;
	274
	275	rc = read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &newpsw, sizeof(psw_t));
	276	if (rc)
	277	return rc;
	278	/* We can not handle clock comparator or timer interrupt with bad PSW */
	279	if ((eic == EXT_IRQ_CLK_COMP \|\| eic == EXT_IRQ_CPU_TIMER) &&
	280	(newpsw.mask & PSW_MASK_EXT))
	281	return -EOPNOTSUPP;
	282
	283	switch (eic) {
	284	case EXT_IRQ_CLK_COMP:
	285	irq.type = KVM_S390_INT_CLOCK_COMP;
	286	break;
	287	case EXT_IRQ_CPU_TIMER:
	288	irq.type = KVM_S390_INT_CPU_TIMER;
	289	break;
	290	case EXT_IRQ_EXTERNAL_CALL:
4953919f DH	291	if (kvm_s390_si_ext_call_pending(vcpu))
4953919f DH	292	return 0;
f14d82e0	293	irq.type = KVM_S390_INT_EXTERNAL_CALL;
383d0b05	294	irq.u.extcall.code = vcpu->arch.sie_block->extcpuaddr;
f14d82e0 TH	295	break;
	296	default:
	297	return -EOPNOTSUPP;
	298	}
	299
	300	return kvm_s390_inject_vcpu(vcpu, &irq);
	301	}
	302
9a558ee3 TH	303	/**
	304	* Handle MOVE PAGE partial execution interception.
	305	*
	306	* This interception can only happen for guests with DAT disabled and
	307	* addresses that are currently not mapped in the host. Thus we try to
	308	* set up the mappings for the corresponding user pages here (or throw
	309	* addressing exceptions in case of illegal guest addresses).
	310	*/
	311	static int handle_mvpg_pei(struct kvm_vcpu *vcpu)
	312	{
f22166dc	313	unsigned long srcaddr, dstaddr;
9a558ee3 TH	314	int reg1, reg2, rc;
	315
	316	kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
9a558ee3 TH	317
9a558ee3 TH	318	/* Make sure that the source is paged-in */
f22166dc TH	319	srcaddr = kvm_s390_real_to_abs(vcpu, vcpu->run->s.regs.gprs[reg2]);
f22166dc TH	320	if (kvm_is_error_gpa(vcpu->kvm, srcaddr))
9a558ee3	321	return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
f22166dc TH	322	rc = kvm_arch_fault_in_page(vcpu, srcaddr, 0);
f22166dc TH	323	if (rc != 0)
9a558ee3 TH	324	return rc;
	325
	326	/* Make sure that the destination is paged-in */
f22166dc TH	327	dstaddr = kvm_s390_real_to_abs(vcpu, vcpu->run->s.regs.gprs[reg1]);
f22166dc TH	328	if (kvm_is_error_gpa(vcpu->kvm, dstaddr))
9a558ee3	329	return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
f22166dc TH	330	rc = kvm_arch_fault_in_page(vcpu, dstaddr, 1);
f22166dc TH	331	if (rc != 0)
9a558ee3 TH	332	return rc;
9a558ee3 TH	333
04b41acd	334	kvm_s390_rewind_psw(vcpu, 4);
9a558ee3 TH	335
	336	return 0;
	337	}
	338
	339	static int handle_partial_execution(struct kvm_vcpu *vcpu)
	340	{
	341	if (vcpu->arch.sie_block->ipa == 0xb254) /* MVPG */
	342	return handle_mvpg_pei(vcpu);
4953919f DH	343	if (vcpu->arch.sie_block->ipa >> 8 == 0xae) /* SIGP */
4953919f DH	344	return kvm_s390_handle_sigp_pei(vcpu);
9a558ee3 TH	345
	346	return -EOPNOTSUPP;
	347	}
	348
062d5e9b	349	static const intercept_handler_t intercept_funcs[] = {
8f2abe6a	350	[0x00 >> 2] = handle_noop,
ba5c1e9b CO	351	[0x04 >> 2] = handle_instruction,
	352	[0x08 >> 2] = handle_prog,
	353	[0x0C >> 2] = handle_instruction_and_prog,
8f2abe6a	354	[0x10 >> 2] = handle_noop,
f14d82e0	355	[0x14 >> 2] = handle_external_interrupt,
fa6b7fe9	356	[0x18 >> 2] = handle_noop,
ba5c1e9b	357	[0x1C >> 2] = kvm_s390_handle_wait,
8f2abe6a CB	358	[0x20 >> 2] = handle_validity,
8f2abe6a CB	359	[0x28 >> 2] = handle_stop,
9a558ee3	360	[0x38 >> 2] = handle_partial_execution,
8f2abe6a CB	361	};
	362
	363	int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
	364	{
	365	intercept_handler_t func;
	366	u8 code = vcpu->arch.sie_block->icptcode;
	367
062d5e9b	368	if (code & 3 \|\| (code >> 2) >= ARRAY_SIZE(intercept_funcs))
b8e660b8	369	return -EOPNOTSUPP;
8f2abe6a CB	370	func = intercept_funcs[code >> 2];
	371	if (func)
	372	return func(vcpu);
b8e660b8	373	return -EOPNOTSUPP;
8f2abe6a	374	}