[mirror_ubuntu-artful-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,
	[0xe3] = kvm_s390_handle_e3,
	[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)) {
		rc = kvm_s390_handle_per_event(vcpu);
		if (rc)
			return rc;
		/* 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)
{
	psw_t oldpsw, newpsw;
	int rc;

	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)
		return handle_sthyi(vcpu);

	if (vcpu->arch.sie_block->ipa == 0 && vcpu->kvm->arch.user_instr0)
		return -EOPNOTSUPP;
	rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &newpsw, sizeof(psw_t));
	if (rc)
		return rc;
	/*
	 * Avoid endless loops of operation exceptions, if the pgm new
	 * PSW will cause a new operation exception.
	 * The heuristic checks if the pgm new psw is within 6 bytes before
	 * the faulting psw address (with same DAT, AS settings) and the
	 * new psw is not a wait psw and the fault was not triggered by
	 * problem state.
	 */
	oldpsw = vcpu->arch.sie_block->gpsw;
	if (oldpsw.addr - newpsw.addr <= 6 &&
	    !(newpsw.mask & PSW_MASK_WAIT) &&
	    !(oldpsw.mask & PSW_MASK_PSTATE) &&
	    (newpsw.mask & PSW_MASK_ASC) == (oldpsw.mask & PSW_MASK_ASC) &&
	    (newpsw.mask & PSW_MASK_DAT) == (oldpsw.mask & PSW_MASK_DAT))
		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 ICPT_EXTREQ:
	case ICPT_IOREQ:
		return handle_noop(vcpu);
	case ICPT_INST:
		rc = handle_instruction(vcpu);
		break;
	case ICPT_PROGI:
		return handle_prog(vcpu);
	case ICPT_EXTINT:
		return handle_external_interrupt(vcpu);
	case ICPT_WAIT:
		return kvm_s390_handle_wait(vcpu);
	case ICPT_VALIDITY:
		return handle_validity(vcpu);
	case ICPT_STOP:
		return handle_stop(vcpu);
	case ICPT_OPEREXC:
		rc = handle_operexc(vcpu);
		break;
	case ICPT_PARTEXEC:
		rc = handle_partial_execution(vcpu);
		break;
	case ICPT_KSS:
		rc = kvm_s390_skey_check_enable(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,
4e0b1ab7	38	[0xe3] = kvm_s390_handle_e3,
bb25b9ba	39	[0xe5] = kvm_s390_handle_e5,
953ed88d	40	[0xeb] = kvm_s390_handle_eb,
ba5c1e9b	41	};
8f2abe6a	42
0e8bc06a	43	u8 kvm_s390_get_ilen(struct kvm_vcpu *vcpu)
04b41acd TH	44	{
04b41acd TH	45	struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
0e8bc06a	46	u8 ilen = 0;
04b41acd	47
0e8bc06a DH	48	switch (vcpu->arch.sie_block->icptcode) {
	49	case ICPT_INST:
	50	case ICPT_INSTPROGI:
	51	case ICPT_OPEREXC:
	52	case ICPT_PARTEXEC:
	53	case ICPT_IOINST:
	54	/* instruction only stored for these icptcodes */
	55	ilen = insn_length(vcpu->arch.sie_block->ipa >> 8);
	56	/* Use the length of the EXECUTE instruction if necessary */
	57	if (sie_block->icptstatus & 1) {
	58	ilen = (sie_block->icptstatus >> 4) & 0x6;
	59	if (!ilen)
	60	ilen = 4;
	61	}
	62	break;
	63	case ICPT_PROGI:
	64	/* bit 1+2 of pgmilc are the ilc, so we directly get ilen */
	65	ilen = vcpu->arch.sie_block->pgmilc & 0x6;
	66	break;
04b41acd	67	}
0e8bc06a	68	return ilen;
04b41acd TH	69	}
04b41acd TH	70
8f2abe6a CB	71	static int handle_noop(struct kvm_vcpu *vcpu)
	72	{
	73	switch (vcpu->arch.sie_block->icptcode) {
	74	case 0x10:
	75	vcpu->stat.exit_external_request++;
	76	break;
8f2abe6a CB	77	default:
	78	break; /* nothing */
	79	}
	80	return 0;
	81	}
	82
	83	static int handle_stop(struct kvm_vcpu *vcpu)
	84	{
6cddd432	85	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
9ace903d	86	int rc = 0;
6cddd432	87	uint8_t flags, stop_pending;
5288fbf0	88
8f2abe6a	89	vcpu->stat.exit_stop_request++;
ade38c31	90
9a022067 DH	91	/* delay the stop if any non-stop irq is pending */
	92	if (kvm_s390_vcpu_has_irq(vcpu, 1))
	93	return 0;
	94
6cddd432 DH	95	/* avoid races with the injection/SIGP STOP code */
	96	spin_lock(&li->lock);
	97	flags = li->irq.stop.flags;
	98	stop_pending = kvm_s390_is_stop_irq_pending(vcpu);
	99	spin_unlock(&li->lock);
32f5ff63	100
6cddd432 DH	101	trace_kvm_s390_stop_request(stop_pending, flags);
6cddd432 DH	102	if (!stop_pending)
32f5ff63	103	return 0;
9ace903d	104
6cddd432	105	if (flags & KVM_S390_STOP_FLAG_STORE_STATUS) {
9e0d5473 JF	106	rc = kvm_s390_vcpu_store_status(vcpu,
9e0d5473 JF	107	KVM_S390_STORE_STATUS_NOADDR);
32f5ff63 DH	108	if (rc)
	109	return rc;
	110	}
	111
6352e4d2 DH	112	if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
6352e4d2 DH	113	kvm_s390_vcpu_stop(vcpu);
32f5ff63	114	return -EOPNOTSUPP;
8f2abe6a CB	115	}
	116
	117	static int handle_validity(struct kvm_vcpu *vcpu)
	118	{
	119	int viwhy = vcpu->arch.sie_block->ipb >> 16;
3edbcff9	120
8f2abe6a	121	vcpu->stat.exit_validity++;
5786fffa	122	trace_kvm_s390_intercept_validity(vcpu, viwhy);
a5efb6b6 CB	123	KVM_EVENT(3, "validity intercept 0x%x for pid %u (kvm 0x%pK)", viwhy,
	124	current->pid, vcpu->kvm);
	125
	126	/* do not warn on invalid runtime instrumentation mode */
	127	WARN_ONCE(viwhy != 0x44, "kvm: unhandled validity intercept 0x%x\n",
	128	viwhy);
	129	return -EINVAL;
8f2abe6a CB	130	}
8f2abe6a CB	131
ba5c1e9b CO	132	static int handle_instruction(struct kvm_vcpu *vcpu)
	133	{
	134	intercept_handler_t handler;
	135
	136	vcpu->stat.exit_instruction++;
5786fffa CH	137	trace_kvm_s390_intercept_instruction(vcpu,
	138	vcpu->arch.sie_block->ipa,
	139	vcpu->arch.sie_block->ipb);
ba5c1e9b CO	140	handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8];
	141	if (handler)
	142	return handler(vcpu);
b8e660b8	143	return -EOPNOTSUPP;
ba5c1e9b CO	144	}
ba5c1e9b CO	145
f6af84e7	146	static int inject_prog_on_prog_intercept(struct kvm_vcpu *vcpu)
439716a5	147	{
f6af84e7 DH	148	struct kvm_s390_pgm_info pgm_info = {
f6af84e7 DH	149	.code = vcpu->arch.sie_block->iprcc,
eaa4f416 DH	150	/* the PSW has already been rewound */
eaa4f416 DH	151	.flags = KVM_S390_PGM_FLAGS_NO_REWIND,
f6af84e7	152	};
439716a5 DH	153
	154	switch (vcpu->arch.sie_block->iprcc & ~PGM_PER) {
	155	case PGM_AFX_TRANSLATION:
	156	case PGM_ASX_TRANSLATION:
	157	case PGM_EX_TRANSLATION:
	158	case PGM_LFX_TRANSLATION:
	159	case PGM_LSTE_SEQUENCE:
	160	case PGM_LSX_TRANSLATION:
	161	case PGM_LX_TRANSLATION:
	162	case PGM_PRIMARY_AUTHORITY:
	163	case PGM_SECONDARY_AUTHORITY:
	164	case PGM_SPACE_SWITCH:
f6af84e7	165	pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
439716a5 DH	166	break;
	167	case PGM_ALEN_TRANSLATION:
	168	case PGM_ALE_SEQUENCE:
	169	case PGM_ASTE_INSTANCE:
	170	case PGM_ASTE_SEQUENCE:
	171	case PGM_ASTE_VALIDITY:
	172	case PGM_EXTENDED_AUTHORITY:
f6af84e7	173	pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
439716a5 DH	174	break;
	175	case PGM_ASCE_TYPE:
	176	case PGM_PAGE_TRANSLATION:
	177	case PGM_REGION_FIRST_TRANS:
	178	case PGM_REGION_SECOND_TRANS:
	179	case PGM_REGION_THIRD_TRANS:
	180	case PGM_SEGMENT_TRANSLATION:
f6af84e7 DH	181	pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
	182	pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
	183	pgm_info.op_access_id = vcpu->arch.sie_block->oai;
439716a5 DH	184	break;
439716a5 DH	185	case PGM_MONITOR:
f6af84e7 DH	186	pgm_info.mon_class_nr = vcpu->arch.sie_block->mcn;
f6af84e7 DH	187	pgm_info.mon_code = vcpu->arch.sie_block->tecmc;
439716a5	188	break;
403c8648	189	case PGM_VECTOR_PROCESSING:
439716a5	190	case PGM_DATA:
f6af84e7	191	pgm_info.data_exc_code = vcpu->arch.sie_block->dxc;
439716a5 DH	192	break;
439716a5 DH	193	case PGM_PROTECTION:
f6af84e7 DH	194	pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
f6af84e7 DH	195	pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
439716a5 DH	196	break;
	197	default:
	198	break;
	199	}
	200
	201	if (vcpu->arch.sie_block->iprcc & PGM_PER) {
f6af84e7 DH	202	pgm_info.per_code = vcpu->arch.sie_block->perc;
	203	pgm_info.per_atmid = vcpu->arch.sie_block->peratmid;
	204	pgm_info.per_address = vcpu->arch.sie_block->peraddr;
	205	pgm_info.per_access_id = vcpu->arch.sie_block->peraid;
439716a5	206	}
f6af84e7	207	return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
439716a5 DH	208	}
439716a5 DH	209
e325fe69 MM	210	/*
	211	* restore ITDB to program-interruption TDB in guest lowcore
	212	* and set TX abort indication if required
	213	*/
	214	static int handle_itdb(struct kvm_vcpu *vcpu)
	215	{
	216	struct kvm_s390_itdb *itdb;
	217	int rc;
	218
	219	if (!IS_TE_ENABLED(vcpu) \|\| !IS_ITDB_VALID(vcpu))
	220	return 0;
	221	if (current->thread.per_flags & PER_FLAG_NO_TE)
	222	return 0;
	223	itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba;
	224	rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb));
	225	if (rc)
	226	return rc;
	227	memset(itdb, 0, sizeof(*itdb));
	228
	229	return 0;
	230	}
	231
27291e21 DH	232	#define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER)
27291e21 DH	233
ba5c1e9b CO	234	static int handle_prog(struct kvm_vcpu *vcpu)
ba5c1e9b CO	235	{
684135e0	236	psw_t psw;
0040e7d2 HC	237	int rc;
0040e7d2 HC	238
ba5c1e9b	239	vcpu->stat.exit_program_interruption++;
7feb6bb8	240
27291e21	241	if (guestdbg_enabled(vcpu) && per_event(vcpu)) {
a69cbe81 DH	242	rc = kvm_s390_handle_per_event(vcpu);
	243	if (rc)
	244	return rc;
27291e21 DH	245	/* the interrupt might have been filtered out completely */
	246	if (vcpu->arch.sie_block->iprcc == 0)
	247	return 0;
	248	}
	249
e325fe69	250	trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
684135e0 TH	251	if (vcpu->arch.sie_block->iprcc == PGM_SPECIFICATION) {
	252	rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &psw, sizeof(psw_t));
	253	if (rc)
	254	return rc;
	255	/* Avoid endless loops of specification exceptions */
	256	if (!is_valid_psw(&psw))
	257	return -EOPNOTSUPP;
	258	}
e325fe69	259	rc = handle_itdb(vcpu);
0040e7d2 HC	260	if (rc)
0040e7d2 HC	261	return rc;
439716a5	262
f6af84e7	263	return inject_prog_on_prog_intercept(vcpu);
ba5c1e9b CO	264	}
ba5c1e9b CO	265
f14d82e0 TH	266	/**
	267	* handle_external_interrupt - used for external interruption interceptions
	268	*
	269	* This interception only occurs if the CPUSTAT_EXT_INT bit was set, or if
	270	* the new PSW does not have external interrupts disabled. In the first case,
	271	* we've got to deliver the interrupt manually, and in the second case, we
	272	* drop to userspace to handle the situation there.
	273	*/
	274	static int handle_external_interrupt(struct kvm_vcpu *vcpu)
	275	{
	276	u16 eic = vcpu->arch.sie_block->eic;
383d0b05	277	struct kvm_s390_irq irq;
f14d82e0 TH	278	psw_t newpsw;
	279	int rc;
	280
	281	vcpu->stat.exit_external_interrupt++;
	282
	283	rc = read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &newpsw, sizeof(psw_t));
	284	if (rc)
	285	return rc;
	286	/* We can not handle clock comparator or timer interrupt with bad PSW */
	287	if ((eic == EXT_IRQ_CLK_COMP \|\| eic == EXT_IRQ_CPU_TIMER) &&
	288	(newpsw.mask & PSW_MASK_EXT))
	289	return -EOPNOTSUPP;
	290
	291	switch (eic) {
	292	case EXT_IRQ_CLK_COMP:
	293	irq.type = KVM_S390_INT_CLOCK_COMP;
	294	break;
	295	case EXT_IRQ_CPU_TIMER:
	296	irq.type = KVM_S390_INT_CPU_TIMER;
	297	break;
	298	case EXT_IRQ_EXTERNAL_CALL:
	299	irq.type = KVM_S390_INT_EXTERNAL_CALL;
383d0b05	300	irq.u.extcall.code = vcpu->arch.sie_block->extcpuaddr;
ea5f4969 DH	301	rc = kvm_s390_inject_vcpu(vcpu, &irq);
	302	/* ignore if another external call is already pending */
	303	if (rc == -EBUSY)
	304	return 0;
	305	return rc;
f14d82e0 TH	306	default:
	307	return -EOPNOTSUPP;
	308	}
	309
	310	return kvm_s390_inject_vcpu(vcpu, &irq);
	311	}
	312
9a558ee3 TH	313	/**
	314	* Handle MOVE PAGE partial execution interception.
	315	*
	316	* This interception can only happen for guests with DAT disabled and
	317	* addresses that are currently not mapped in the host. Thus we try to
	318	* set up the mappings for the corresponding user pages here (or throw
	319	* addressing exceptions in case of illegal guest addresses).
	320	*/
	321	static int handle_mvpg_pei(struct kvm_vcpu *vcpu)
	322	{
f22166dc	323	unsigned long srcaddr, dstaddr;
9a558ee3 TH	324	int reg1, reg2, rc;
	325
	326	kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
9a558ee3 TH	327
9a558ee3 TH	328	/* Make sure that the source is paged-in */
3cfad023	329	rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg2],
92c96321	330	reg2, &srcaddr, GACC_FETCH);
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, srcaddr, 0);
f22166dc TH	334	if (rc != 0)
9a558ee3 TH	335	return rc;
	336
	337	/* Make sure that the destination is paged-in */
3cfad023	338	rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg1],
92c96321	339	reg1, &dstaddr, GACC_STORE);
3cfad023 TH	340	if (rc)
3cfad023 TH	341	return kvm_s390_inject_prog_cond(vcpu, rc);
f22166dc TH	342	rc = kvm_arch_fault_in_page(vcpu, dstaddr, 1);
f22166dc TH	343	if (rc != 0)
9a558ee3 TH	344	return rc;
9a558ee3 TH	345
0e8bc06a	346	kvm_s390_retry_instr(vcpu);
9a558ee3 TH	347
	348	return 0;
	349	}
	350
	351	static int handle_partial_execution(struct kvm_vcpu *vcpu)
	352	{
9ec6de19 AY	353	vcpu->stat.exit_pei++;
9ec6de19 AY	354
9a558ee3 TH	355	if (vcpu->arch.sie_block->ipa == 0xb254) /* MVPG */
9a558ee3 TH	356	return handle_mvpg_pei(vcpu);
4953919f DH	357	if (vcpu->arch.sie_block->ipa >> 8 == 0xae) /* SIGP */
4953919f DH	358	return kvm_s390_handle_sigp_pei(vcpu);
9a558ee3 TH	359
	360	return -EOPNOTSUPP;
	361	}
	362
a011eeb2 JF	363	static int handle_operexc(struct kvm_vcpu *vcpu)
a011eeb2 JF	364	{
fb7dc1d4 CB	365	psw_t oldpsw, newpsw;
	366	int rc;
	367
a011eeb2 JF	368	vcpu->stat.exit_operation_exception++;
	369	trace_kvm_s390_handle_operexc(vcpu, vcpu->arch.sie_block->ipa,
	370	vcpu->arch.sie_block->ipb);
	371
c0a6bfdc	372	if (vcpu->arch.sie_block->ipa == 0xb256)
95ca2cb5 JF	373	return handle_sthyi(vcpu);
95ca2cb5 JF	374
6502a34c DH	375	if (vcpu->arch.sie_block->ipa == 0 && vcpu->kvm->arch.user_instr0)
6502a34c DH	376	return -EOPNOTSUPP;
fb7dc1d4 CB	377	rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &newpsw, sizeof(psw_t));
	378	if (rc)
	379	return rc;
	380	/*
	381	* Avoid endless loops of operation exceptions, if the pgm new
	382	* PSW will cause a new operation exception.
	383	* The heuristic checks if the pgm new psw is within 6 bytes before
	384	* the faulting psw address (with same DAT, AS settings) and the
	385	* new psw is not a wait psw and the fault was not triggered by
	386	* problem state.
	387	*/
	388	oldpsw = vcpu->arch.sie_block->gpsw;
	389	if (oldpsw.addr - newpsw.addr <= 6 &&
	390	!(newpsw.mask & PSW_MASK_WAIT) &&
	391	!(oldpsw.mask & PSW_MASK_PSTATE) &&
	392	(newpsw.mask & PSW_MASK_ASC) == (oldpsw.mask & PSW_MASK_ASC) &&
	393	(newpsw.mask & PSW_MASK_DAT) == (oldpsw.mask & PSW_MASK_DAT))
	394	return -EOPNOTSUPP;
6502a34c	395
a011eeb2 JF	396	return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
	397	}
	398
8f2abe6a CB	399	int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
8f2abe6a CB	400	{
5ffe466c DH	401	int rc, per_rc = 0;
5ffe466c DH	402
71f116bf DH	403	if (kvm_is_ucontrol(vcpu->kvm))
	404	return -EOPNOTSUPP;
	405
46b708ea	406	switch (vcpu->arch.sie_block->icptcode) {
947b8972 FA	407	case ICPT_EXTREQ:
947b8972 FA	408	case ICPT_IOREQ:
46b708ea	409	return handle_noop(vcpu);
947b8972	410	case ICPT_INST:
5ffe466c DH	411	rc = handle_instruction(vcpu);
5ffe466c DH	412	break;
947b8972	413	case ICPT_PROGI:
46b708ea	414	return handle_prog(vcpu);
947b8972	415	case ICPT_EXTINT:
46b708ea	416	return handle_external_interrupt(vcpu);
947b8972	417	case ICPT_WAIT:
46b708ea	418	return kvm_s390_handle_wait(vcpu);
947b8972	419	case ICPT_VALIDITY:
46b708ea	420	return handle_validity(vcpu);
947b8972	421	case ICPT_STOP:
46b708ea	422	return handle_stop(vcpu);
947b8972	423	case ICPT_OPEREXC:
5ffe466c DH	424	rc = handle_operexc(vcpu);
5ffe466c DH	425	break;
947b8972	426	case ICPT_PARTEXEC:
5ffe466c DH	427	rc = handle_partial_execution(vcpu);
5ffe466c DH	428	break;
730cd632 FA	429	case ICPT_KSS:
	430	rc = kvm_s390_skey_check_enable(vcpu);
	431	break;
46b708ea	432	default:
b8e660b8	433	return -EOPNOTSUPP;
46b708ea	434	}
5ffe466c DH	435
	436	/* process PER, also if the instrution is processed in user space */
	437	if (vcpu->arch.sie_block->icptstatus & 0x02 &&
	438	(!rc \|\| rc == -EOPNOTSUPP))
	439	per_rc = kvm_s390_handle_per_ifetch_icpt(vcpu);
	440	return per_rc ? per_rc : rc;
8f2abe6a	441	}