[mirror_ubuntu-bionic-kernel.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,
	[0xaa] = kvm_s390_handle_aa,
	[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);
	KVM_EVENT(3, "validity intercept 0x%x for pid %u (kvm 0x%pK)", viwhy,
		  current->pid, vcpu->kvm);

	/* do not warn on invalid runtime instrumentation mode */
	WARN_ONCE(viwhy != 0x44, "kvm: unhandled validity intercept 0x%x\n",
		  viwhy);
	return -EINVAL;
}

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)
{
	vcpu->stat.exit_pei++;

	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 int handle_operexc(struct kvm_vcpu *vcpu)
{
	vcpu->stat.exit_operation_exception++;
	trace_kvm_s390_handle_operexc(vcpu, vcpu->arch.sie_block->ipa,
				      vcpu->arch.sie_block->ipb);

	if (vcpu->arch.sie_block->ipa == 0xb256 &&
	    test_kvm_facility(vcpu->kvm, 74))
		return handle_sthyi(vcpu);

	if (vcpu->arch.sie_block->ipa == 0 && vcpu->kvm->arch.user_instr0)
		return -EOPNOTSUPP;

	return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
}

int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
{
	int rc, per_rc = 0;

	if (kvm_is_ucontrol(vcpu->kvm))
		return -EOPNOTSUPP;

	switch (vcpu->arch.sie_block->icptcode) {
	case 0x10:
	case 0x18:
		return handle_noop(vcpu);
	case 0x04:
		rc = handle_instruction(vcpu);
		break;
	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 0x2c:
		rc = handle_operexc(vcpu);
		break;
	case 0x38:
		rc = handle_partial_execution(vcpu);
		break;
	default:
		return -EOPNOTSUPP;
	}

	/* process PER, also if the instrution is processed in user space */
	if (vcpu->arch.sie_block->icptstatus & 0x02 &&
	    (!rc || rc == -EOPNOTSUPP))
		per_rc = kvm_s390_handle_per_ifetch_icpt(vcpu);
	return per_rc ? per_rc : rc;
}
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,
80cd8763	32	[0xaa] = kvm_s390_handle_aa,
5288fbf0	33	[0xae] = kvm_s390_handle_sigp,
70455a36	34	[0xb2] = kvm_s390_handle_b2,
aba07508	35	[0xb6] = kvm_s390_handle_stctl,
953ed88d	36	[0xb7] = kvm_s390_handle_lctl,
48a3e950	37	[0xb9] = kvm_s390_handle_b9,
bb25b9ba	38	[0xe5] = kvm_s390_handle_e5,
953ed88d	39	[0xeb] = kvm_s390_handle_eb,
ba5c1e9b	40	};
8f2abe6a	41
0e8bc06a	42	u8 kvm_s390_get_ilen(struct kvm_vcpu *vcpu)
04b41acd TH	43	{
04b41acd TH	44	struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
0e8bc06a	45	u8 ilen = 0;
04b41acd	46
0e8bc06a DH	47	switch (vcpu->arch.sie_block->icptcode) {
	48	case ICPT_INST:
	49	case ICPT_INSTPROGI:
	50	case ICPT_OPEREXC:
	51	case ICPT_PARTEXEC:
	52	case ICPT_IOINST:
	53	/* instruction only stored for these icptcodes */
	54	ilen = insn_length(vcpu->arch.sie_block->ipa >> 8);
	55	/* Use the length of the EXECUTE instruction if necessary */
	56	if (sie_block->icptstatus & 1) {
	57	ilen = (sie_block->icptstatus >> 4) & 0x6;
	58	if (!ilen)
	59	ilen = 4;
	60	}
	61	break;
	62	case ICPT_PROGI:
	63	/* bit 1+2 of pgmilc are the ilc, so we directly get ilen */
	64	ilen = vcpu->arch.sie_block->pgmilc & 0x6;
	65	break;
04b41acd	66	}
0e8bc06a	67	return ilen;
04b41acd TH	68	}
04b41acd TH	69
8f2abe6a CB	70	static int handle_noop(struct kvm_vcpu *vcpu)
	71	{
	72	switch (vcpu->arch.sie_block->icptcode) {
	73	case 0x10:
	74	vcpu->stat.exit_external_request++;
	75	break;
8f2abe6a CB	76	default:
	77	break; /* nothing */
	78	}
	79	return 0;
	80	}
	81
	82	static int handle_stop(struct kvm_vcpu *vcpu)
	83	{
6cddd432	84	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
9ace903d	85	int rc = 0;
6cddd432	86	uint8_t flags, stop_pending;
5288fbf0	87
8f2abe6a	88	vcpu->stat.exit_stop_request++;
ade38c31	89
9a022067 DH	90	/* delay the stop if any non-stop irq is pending */
	91	if (kvm_s390_vcpu_has_irq(vcpu, 1))
	92	return 0;
	93
6cddd432 DH	94	/* avoid races with the injection/SIGP STOP code */
	95	spin_lock(&li->lock);
	96	flags = li->irq.stop.flags;
	97	stop_pending = kvm_s390_is_stop_irq_pending(vcpu);
	98	spin_unlock(&li->lock);
32f5ff63	99
6cddd432 DH	100	trace_kvm_s390_stop_request(stop_pending, flags);
6cddd432 DH	101	if (!stop_pending)
32f5ff63	102	return 0;
9ace903d	103
6cddd432	104	if (flags & KVM_S390_STOP_FLAG_STORE_STATUS) {
9e0d5473 JF	105	rc = kvm_s390_vcpu_store_status(vcpu,
9e0d5473 JF	106	KVM_S390_STORE_STATUS_NOADDR);
32f5ff63 DH	107	if (rc)
	108	return rc;
	109	}
	110
6352e4d2 DH	111	if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
6352e4d2 DH	112	kvm_s390_vcpu_stop(vcpu);
32f5ff63	113	return -EOPNOTSUPP;
8f2abe6a CB	114	}
	115
	116	static int handle_validity(struct kvm_vcpu *vcpu)
	117	{
	118	int viwhy = vcpu->arch.sie_block->ipb >> 16;
3edbcff9	119
8f2abe6a	120	vcpu->stat.exit_validity++;
5786fffa	121	trace_kvm_s390_intercept_validity(vcpu, viwhy);
a5efb6b6 CB	122	KVM_EVENT(3, "validity intercept 0x%x for pid %u (kvm 0x%pK)", viwhy,
	123	current->pid, vcpu->kvm);
	124
	125	/* do not warn on invalid runtime instrumentation mode */
	126	WARN_ONCE(viwhy != 0x44, "kvm: unhandled validity intercept 0x%x\n",
	127	viwhy);
	128	return -EINVAL;
8f2abe6a CB	129	}
8f2abe6a CB	130
ba5c1e9b CO	131	static int handle_instruction(struct kvm_vcpu *vcpu)
	132	{
	133	intercept_handler_t handler;
	134
	135	vcpu->stat.exit_instruction++;
5786fffa CH	136	trace_kvm_s390_intercept_instruction(vcpu,
	137	vcpu->arch.sie_block->ipa,
	138	vcpu->arch.sie_block->ipb);
ba5c1e9b CO	139	handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8];
	140	if (handler)
	141	return handler(vcpu);
b8e660b8	142	return -EOPNOTSUPP;
ba5c1e9b CO	143	}
ba5c1e9b CO	144
f6af84e7	145	static int inject_prog_on_prog_intercept(struct kvm_vcpu *vcpu)
439716a5	146	{
f6af84e7 DH	147	struct kvm_s390_pgm_info pgm_info = {
f6af84e7 DH	148	.code = vcpu->arch.sie_block->iprcc,
eaa4f416 DH	149	/* the PSW has already been rewound */
eaa4f416 DH	150	.flags = KVM_S390_PGM_FLAGS_NO_REWIND,
f6af84e7	151	};
439716a5 DH	152
	153	switch (vcpu->arch.sie_block->iprcc & ~PGM_PER) {
	154	case PGM_AFX_TRANSLATION:
	155	case PGM_ASX_TRANSLATION:
	156	case PGM_EX_TRANSLATION:
	157	case PGM_LFX_TRANSLATION:
	158	case PGM_LSTE_SEQUENCE:
	159	case PGM_LSX_TRANSLATION:
	160	case PGM_LX_TRANSLATION:
	161	case PGM_PRIMARY_AUTHORITY:
	162	case PGM_SECONDARY_AUTHORITY:
	163	case PGM_SPACE_SWITCH:
f6af84e7	164	pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
439716a5 DH	165	break;
	166	case PGM_ALEN_TRANSLATION:
	167	case PGM_ALE_SEQUENCE:
	168	case PGM_ASTE_INSTANCE:
	169	case PGM_ASTE_SEQUENCE:
	170	case PGM_ASTE_VALIDITY:
	171	case PGM_EXTENDED_AUTHORITY:
f6af84e7	172	pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
439716a5 DH	173	break;
	174	case PGM_ASCE_TYPE:
	175	case PGM_PAGE_TRANSLATION:
	176	case PGM_REGION_FIRST_TRANS:
	177	case PGM_REGION_SECOND_TRANS:
	178	case PGM_REGION_THIRD_TRANS:
	179	case PGM_SEGMENT_TRANSLATION:
f6af84e7 DH	180	pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
	181	pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
	182	pgm_info.op_access_id = vcpu->arch.sie_block->oai;
439716a5 DH	183	break;
439716a5 DH	184	case PGM_MONITOR:
f6af84e7 DH	185	pgm_info.mon_class_nr = vcpu->arch.sie_block->mcn;
f6af84e7 DH	186	pgm_info.mon_code = vcpu->arch.sie_block->tecmc;
439716a5	187	break;
403c8648	188	case PGM_VECTOR_PROCESSING:
439716a5	189	case PGM_DATA:
f6af84e7	190	pgm_info.data_exc_code = vcpu->arch.sie_block->dxc;
439716a5 DH	191	break;
439716a5 DH	192	case PGM_PROTECTION:
f6af84e7 DH	193	pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
f6af84e7 DH	194	pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
439716a5 DH	195	break;
	196	default:
	197	break;
	198	}
	199
	200	if (vcpu->arch.sie_block->iprcc & PGM_PER) {
f6af84e7 DH	201	pgm_info.per_code = vcpu->arch.sie_block->perc;
	202	pgm_info.per_atmid = vcpu->arch.sie_block->peratmid;
	203	pgm_info.per_address = vcpu->arch.sie_block->peraddr;
	204	pgm_info.per_access_id = vcpu->arch.sie_block->peraid;
439716a5	205	}
f6af84e7	206	return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
439716a5 DH	207	}
439716a5 DH	208
e325fe69 MM	209	/*
	210	* restore ITDB to program-interruption TDB in guest lowcore
	211	* and set TX abort indication if required
	212	*/
	213	static int handle_itdb(struct kvm_vcpu *vcpu)
	214	{
	215	struct kvm_s390_itdb *itdb;
	216	int rc;
	217
	218	if (!IS_TE_ENABLED(vcpu) \|\| !IS_ITDB_VALID(vcpu))
	219	return 0;
	220	if (current->thread.per_flags & PER_FLAG_NO_TE)
	221	return 0;
	222	itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba;
	223	rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb));
	224	if (rc)
	225	return rc;
	226	memset(itdb, 0, sizeof(*itdb));
	227
	228	return 0;
	229	}
	230
27291e21 DH	231	#define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER)
27291e21 DH	232
ba5c1e9b CO	233	static int handle_prog(struct kvm_vcpu *vcpu)
ba5c1e9b CO	234	{
684135e0	235	psw_t psw;
0040e7d2 HC	236	int rc;
0040e7d2 HC	237
ba5c1e9b	238	vcpu->stat.exit_program_interruption++;
7feb6bb8	239
27291e21 DH	240	if (guestdbg_enabled(vcpu) && per_event(vcpu)) {
	241	kvm_s390_handle_per_event(vcpu);
	242	/* the interrupt might have been filtered out completely */
	243	if (vcpu->arch.sie_block->iprcc == 0)
	244	return 0;
	245	}
	246
e325fe69	247	trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
684135e0 TH	248	if (vcpu->arch.sie_block->iprcc == PGM_SPECIFICATION) {
	249	rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &psw, sizeof(psw_t));
	250	if (rc)
	251	return rc;
	252	/* Avoid endless loops of specification exceptions */
	253	if (!is_valid_psw(&psw))
	254	return -EOPNOTSUPP;
	255	}
e325fe69	256	rc = handle_itdb(vcpu);
0040e7d2 HC	257	if (rc)
0040e7d2 HC	258	return rc;
439716a5	259
f6af84e7	260	return inject_prog_on_prog_intercept(vcpu);
ba5c1e9b CO	261	}
ba5c1e9b CO	262
f14d82e0 TH	263	/**
	264	* handle_external_interrupt - used for external interruption interceptions
	265	*
	266	* This interception only occurs if the CPUSTAT_EXT_INT bit was set, or if
	267	* the new PSW does not have external interrupts disabled. In the first case,
	268	* we've got to deliver the interrupt manually, and in the second case, we
	269	* drop to userspace to handle the situation there.
	270	*/
	271	static int handle_external_interrupt(struct kvm_vcpu *vcpu)
	272	{
	273	u16 eic = vcpu->arch.sie_block->eic;
383d0b05	274	struct kvm_s390_irq irq;
f14d82e0 TH	275	psw_t newpsw;
	276	int rc;
	277
	278	vcpu->stat.exit_external_interrupt++;
	279
	280	rc = read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &newpsw, sizeof(psw_t));
	281	if (rc)
	282	return rc;
	283	/* We can not handle clock comparator or timer interrupt with bad PSW */
	284	if ((eic == EXT_IRQ_CLK_COMP \|\| eic == EXT_IRQ_CPU_TIMER) &&
	285	(newpsw.mask & PSW_MASK_EXT))
	286	return -EOPNOTSUPP;
	287
	288	switch (eic) {
	289	case EXT_IRQ_CLK_COMP:
	290	irq.type = KVM_S390_INT_CLOCK_COMP;
	291	break;
	292	case EXT_IRQ_CPU_TIMER:
	293	irq.type = KVM_S390_INT_CPU_TIMER;
	294	break;
	295	case EXT_IRQ_EXTERNAL_CALL:
	296	irq.type = KVM_S390_INT_EXTERNAL_CALL;
383d0b05	297	irq.u.extcall.code = vcpu->arch.sie_block->extcpuaddr;
ea5f4969 DH	298	rc = kvm_s390_inject_vcpu(vcpu, &irq);
	299	/* ignore if another external call is already pending */
	300	if (rc == -EBUSY)
	301	return 0;
	302	return rc;
f14d82e0 TH	303	default:
	304	return -EOPNOTSUPP;
	305	}
	306
	307	return kvm_s390_inject_vcpu(vcpu, &irq);
	308	}
	309
9a558ee3 TH	310	/**
	311	* Handle MOVE PAGE partial execution interception.
	312	*
	313	* This interception can only happen for guests with DAT disabled and
	314	* addresses that are currently not mapped in the host. Thus we try to
	315	* set up the mappings for the corresponding user pages here (or throw
	316	* addressing exceptions in case of illegal guest addresses).
	317	*/
	318	static int handle_mvpg_pei(struct kvm_vcpu *vcpu)
	319	{
f22166dc	320	unsigned long srcaddr, dstaddr;
9a558ee3 TH	321	int reg1, reg2, rc;
	322
	323	kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
9a558ee3 TH	324
9a558ee3 TH	325	/* Make sure that the source is paged-in */
3cfad023	326	rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg2],
92c96321	327	reg2, &srcaddr, GACC_FETCH);
3cfad023 TH	328	if (rc)
3cfad023 TH	329	return kvm_s390_inject_prog_cond(vcpu, rc);
f22166dc TH	330	rc = kvm_arch_fault_in_page(vcpu, srcaddr, 0);
f22166dc TH	331	if (rc != 0)
9a558ee3 TH	332	return rc;
	333
	334	/* Make sure that the destination is paged-in */
3cfad023	335	rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg1],
92c96321	336	reg1, &dstaddr, GACC_STORE);
3cfad023 TH	337	if (rc)
3cfad023 TH	338	return kvm_s390_inject_prog_cond(vcpu, rc);
f22166dc TH	339	rc = kvm_arch_fault_in_page(vcpu, dstaddr, 1);
f22166dc TH	340	if (rc != 0)
9a558ee3 TH	341	return rc;
9a558ee3 TH	342
0e8bc06a	343	kvm_s390_retry_instr(vcpu);
9a558ee3 TH	344
	345	return 0;
	346	}
	347
	348	static int handle_partial_execution(struct kvm_vcpu *vcpu)
	349	{
9ec6de19 AY	350	vcpu->stat.exit_pei++;
9ec6de19 AY	351
9a558ee3 TH	352	if (vcpu->arch.sie_block->ipa == 0xb254) /* MVPG */
9a558ee3 TH	353	return handle_mvpg_pei(vcpu);
4953919f DH	354	if (vcpu->arch.sie_block->ipa >> 8 == 0xae) /* SIGP */
4953919f DH	355	return kvm_s390_handle_sigp_pei(vcpu);
9a558ee3 TH	356
	357	return -EOPNOTSUPP;
	358	}
	359
a011eeb2 JF	360	static int handle_operexc(struct kvm_vcpu *vcpu)
	361	{
	362	vcpu->stat.exit_operation_exception++;
	363	trace_kvm_s390_handle_operexc(vcpu, vcpu->arch.sie_block->ipa,
	364	vcpu->arch.sie_block->ipb);
	365
95ca2cb5 JF	366	if (vcpu->arch.sie_block->ipa == 0xb256 &&
	367	test_kvm_facility(vcpu->kvm, 74))
	368	return handle_sthyi(vcpu);
	369
6502a34c DH	370	if (vcpu->arch.sie_block->ipa == 0 && vcpu->kvm->arch.user_instr0)
	371	return -EOPNOTSUPP;
	372
a011eeb2 JF	373	return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
	374	}
	375
8f2abe6a CB	376	int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
8f2abe6a CB	377	{
5ffe466c DH	378	int rc, per_rc = 0;
5ffe466c DH	379
71f116bf DH	380	if (kvm_is_ucontrol(vcpu->kvm))
	381	return -EOPNOTSUPP;
	382
46b708ea	383	switch (vcpu->arch.sie_block->icptcode) {
46b708ea CB	384	case 0x10:
	385	case 0x18:
	386	return handle_noop(vcpu);
	387	case 0x04:
5ffe466c DH	388	rc = handle_instruction(vcpu);
5ffe466c DH	389	break;
46b708ea CB	390	case 0x08:
	391	return handle_prog(vcpu);
	392	case 0x14:
	393	return handle_external_interrupt(vcpu);
	394	case 0x1c:
	395	return kvm_s390_handle_wait(vcpu);
	396	case 0x20:
	397	return handle_validity(vcpu);
	398	case 0x28:
	399	return handle_stop(vcpu);
a011eeb2	400	case 0x2c:
5ffe466c DH	401	rc = handle_operexc(vcpu);
5ffe466c DH	402	break;
46b708ea	403	case 0x38:
5ffe466c DH	404	rc = handle_partial_execution(vcpu);
5ffe466c DH	405	break;
46b708ea	406	default:
b8e660b8	407	return -EOPNOTSUPP;
46b708ea	408	}
5ffe466c DH	409
	410	/* process PER, also if the instrution is processed in user space */
	411	if (vcpu->arch.sie_block->icptstatus & 0x02 &&
	412	(!rc \|\| rc == -EOPNOTSUPP))
	413	per_rc = kvm_s390_handle_per_ifetch_icpt(vcpu);
	414	return per_rc ? per_rc : rc;
8f2abe6a	415	}