[linux-block.git] / arch / s390 / kvm / intercept.c

// SPDX-License-Identifier: GPL-2.0
/*
 * in-kernel handling for sie intercepts
 *
 * Copyright IBM Corp. 2008, 2014
 *
 *    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 <asm/sysinfo.h>

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

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)
{
	vcpu->stat.exit_instruction++;
	trace_kvm_s390_intercept_instruction(vcpu,
					     vcpu->arch.sie_block->ipa,
					     vcpu->arch.sie_block->ipb);

	switch (vcpu->arch.sie_block->ipa >> 8) {
	case 0x01:
		return kvm_s390_handle_01(vcpu);
	case 0x82:
		return kvm_s390_handle_lpsw(vcpu);
	case 0x83:
		return kvm_s390_handle_diag(vcpu);
	case 0xaa:
		return kvm_s390_handle_aa(vcpu);
	case 0xae:
		return kvm_s390_handle_sigp(vcpu);
	case 0xb2:
		return kvm_s390_handle_b2(vcpu);
	case 0xb6:
		return kvm_s390_handle_stctl(vcpu);
	case 0xb7:
		return kvm_s390_handle_lctl(vcpu);
	case 0xb9:
		return kvm_s390_handle_b9(vcpu);
	case 0xe3:
		return kvm_s390_handle_e3(vcpu);
	case 0xe5:
		return kvm_s390_handle_e5(vcpu);
	case 0xeb:
		return kvm_s390_handle_eb(vcpu);
	default:
		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;
}

/*
 * Handle the sthyi instruction that provides the guest with system
 * information, like current CPU resources available at each level of
 * the machine.
 */
int handle_sthyi(struct kvm_vcpu *vcpu)
{
	int reg1, reg2, r = 0;
	u64 code, addr, cc = 0, rc = 0;
	struct sthyi_sctns *sctns = NULL;

	if (!test_kvm_facility(vcpu->kvm, 74))
		return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);

	kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
	code = vcpu->run->s.regs.gprs[reg1];
	addr = vcpu->run->s.regs.gprs[reg2];

	vcpu->stat.instruction_sthyi++;
	VCPU_EVENT(vcpu, 3, "STHYI: fc: %llu addr: 0x%016llx", code, addr);
	trace_kvm_s390_handle_sthyi(vcpu, code, addr);

	if (reg1 == reg2 || reg1 & 1 || reg2 & 1)
		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);

	if (code & 0xffff) {
		cc = 3;
		rc = 4;
		goto out;
	}

	if (addr & ~PAGE_MASK)
		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);

	sctns = (void *)get_zeroed_page(GFP_KERNEL);
	if (!sctns)
		return -ENOMEM;

	cc = sthyi_fill(sctns, &rc);

out:
	if (!cc) {
		r = write_guest(vcpu, addr, reg2, sctns, PAGE_SIZE);
		if (r) {
			free_page((unsigned long)sctns);
			return kvm_s390_inject_prog_cond(vcpu, r);
		}
	}

	free_page((unsigned long)sctns);
	vcpu->run->s.regs.gprs[reg2 + 1] = rc;
	kvm_s390_set_psw_cc(vcpu, cc);
	return r;
}

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
d809aa23	1	// SPDX-License-Identifier: GPL-2.0
8f2abe6a	2	/*
a53c8fab	3	* in-kernel handling for sie intercepts
8f2abe6a	4	*
9a558ee3	5	* Copyright IBM Corp. 2008, 2014
8f2abe6a	6	*
8f2abe6a CB	7	* Author(s): Carsten Otte <cotte@de.ibm.com>
	8	* Christian Borntraeger <borntraeger@de.ibm.com>
	9	*/
	10
	11	#include <linux/kvm_host.h>
	12	#include <linux/errno.h>
	13	#include <linux/pagemap.h>
	14
	15	#include <asm/kvm_host.h>
a86dcc24	16	#include <asm/asm-offsets.h>
f14d82e0	17	#include <asm/irq.h>
b7c92f1a	18	#include <asm/sysinfo.h>
8f2abe6a CB	19
8f2abe6a CB	20	#include "kvm-s390.h"
ba5c1e9b	21	#include "gaccess.h"
5786fffa	22	#include "trace.h"
ade38c31	23	#include "trace-s390.h"
ba5c1e9b	24
0e8bc06a	25	u8 kvm_s390_get_ilen(struct kvm_vcpu *vcpu)
04b41acd TH	26	{
04b41acd TH	27	struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
0e8bc06a	28	u8 ilen = 0;
04b41acd	29
0e8bc06a DH	30	switch (vcpu->arch.sie_block->icptcode) {
	31	case ICPT_INST:
	32	case ICPT_INSTPROGI:
	33	case ICPT_OPEREXC:
	34	case ICPT_PARTEXEC:
	35	case ICPT_IOINST:
	36	/* instruction only stored for these icptcodes */
	37	ilen = insn_length(vcpu->arch.sie_block->ipa >> 8);
	38	/* Use the length of the EXECUTE instruction if necessary */
	39	if (sie_block->icptstatus & 1) {
	40	ilen = (sie_block->icptstatus >> 4) & 0x6;
	41	if (!ilen)
	42	ilen = 4;
	43	}
	44	break;
	45	case ICPT_PROGI:
	46	/* bit 1+2 of pgmilc are the ilc, so we directly get ilen */
	47	ilen = vcpu->arch.sie_block->pgmilc & 0x6;
	48	break;
04b41acd	49	}
0e8bc06a	50	return ilen;
04b41acd TH	51	}
04b41acd TH	52
8f2abe6a CB	53	static int handle_noop(struct kvm_vcpu *vcpu)
	54	{
	55	switch (vcpu->arch.sie_block->icptcode) {
	56	case 0x10:
	57	vcpu->stat.exit_external_request++;
	58	break;
8f2abe6a CB	59	default:
	60	break; /* nothing */
	61	}
	62	return 0;
	63	}
	64
	65	static int handle_stop(struct kvm_vcpu *vcpu)
	66	{
6cddd432	67	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
9ace903d	68	int rc = 0;
6cddd432	69	uint8_t flags, stop_pending;
5288fbf0	70
8f2abe6a	71	vcpu->stat.exit_stop_request++;
ade38c31	72
9a022067 DH	73	/* delay the stop if any non-stop irq is pending */
	74	if (kvm_s390_vcpu_has_irq(vcpu, 1))
	75	return 0;
	76
6cddd432 DH	77	/* avoid races with the injection/SIGP STOP code */
	78	spin_lock(&li->lock);
	79	flags = li->irq.stop.flags;
	80	stop_pending = kvm_s390_is_stop_irq_pending(vcpu);
	81	spin_unlock(&li->lock);
32f5ff63	82
6cddd432 DH	83	trace_kvm_s390_stop_request(stop_pending, flags);
6cddd432 DH	84	if (!stop_pending)
32f5ff63	85	return 0;
9ace903d	86
6cddd432	87	if (flags & KVM_S390_STOP_FLAG_STORE_STATUS) {
9e0d5473 JF	88	rc = kvm_s390_vcpu_store_status(vcpu,
9e0d5473 JF	89	KVM_S390_STORE_STATUS_NOADDR);
32f5ff63 DH	90	if (rc)
	91	return rc;
	92	}
	93
6352e4d2 DH	94	if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
6352e4d2 DH	95	kvm_s390_vcpu_stop(vcpu);
32f5ff63	96	return -EOPNOTSUPP;
8f2abe6a CB	97	}
	98
	99	static int handle_validity(struct kvm_vcpu *vcpu)
	100	{
	101	int viwhy = vcpu->arch.sie_block->ipb >> 16;
3edbcff9	102
8f2abe6a	103	vcpu->stat.exit_validity++;
5786fffa	104	trace_kvm_s390_intercept_validity(vcpu, viwhy);
a5efb6b6 CB	105	KVM_EVENT(3, "validity intercept 0x%x for pid %u (kvm 0x%pK)", viwhy,
	106	current->pid, vcpu->kvm);
	107
	108	/* do not warn on invalid runtime instrumentation mode */
	109	WARN_ONCE(viwhy != 0x44, "kvm: unhandled validity intercept 0x%x\n",
	110	viwhy);
	111	return -EINVAL;
8f2abe6a CB	112	}
8f2abe6a CB	113
ba5c1e9b CO	114	static int handle_instruction(struct kvm_vcpu *vcpu)
ba5c1e9b CO	115	{
ba5c1e9b	116	vcpu->stat.exit_instruction++;
5786fffa CH	117	trace_kvm_s390_intercept_instruction(vcpu,
	118	vcpu->arch.sie_block->ipa,
	119	vcpu->arch.sie_block->ipb);
cb7485da CB	120
	121	switch (vcpu->arch.sie_block->ipa >> 8) {
	122	case 0x01:
	123	return kvm_s390_handle_01(vcpu);
	124	case 0x82:
	125	return kvm_s390_handle_lpsw(vcpu);
	126	case 0x83:
	127	return kvm_s390_handle_diag(vcpu);
	128	case 0xaa:
	129	return kvm_s390_handle_aa(vcpu);
	130	case 0xae:
	131	return kvm_s390_handle_sigp(vcpu);
	132	case 0xb2:
	133	return kvm_s390_handle_b2(vcpu);
	134	case 0xb6:
	135	return kvm_s390_handle_stctl(vcpu);
	136	case 0xb7:
	137	return kvm_s390_handle_lctl(vcpu);
	138	case 0xb9:
	139	return kvm_s390_handle_b9(vcpu);
	140	case 0xe3:
	141	return kvm_s390_handle_e3(vcpu);
	142	case 0xe5:
	143	return kvm_s390_handle_e5(vcpu);
	144	case 0xeb:
	145	return kvm_s390_handle_eb(vcpu);
	146	default:
	147	return -EOPNOTSUPP;
	148	}
ba5c1e9b CO	149	}
ba5c1e9b CO	150
f6af84e7	151	static int inject_prog_on_prog_intercept(struct kvm_vcpu *vcpu)
439716a5	152	{
f6af84e7 DH	153	struct kvm_s390_pgm_info pgm_info = {
f6af84e7 DH	154	.code = vcpu->arch.sie_block->iprcc,
eaa4f416 DH	155	/* the PSW has already been rewound */
eaa4f416 DH	156	.flags = KVM_S390_PGM_FLAGS_NO_REWIND,
f6af84e7	157	};
439716a5 DH	158
	159	switch (vcpu->arch.sie_block->iprcc & ~PGM_PER) {
	160	case PGM_AFX_TRANSLATION:
	161	case PGM_ASX_TRANSLATION:
	162	case PGM_EX_TRANSLATION:
	163	case PGM_LFX_TRANSLATION:
	164	case PGM_LSTE_SEQUENCE:
	165	case PGM_LSX_TRANSLATION:
	166	case PGM_LX_TRANSLATION:
	167	case PGM_PRIMARY_AUTHORITY:
	168	case PGM_SECONDARY_AUTHORITY:
	169	case PGM_SPACE_SWITCH:
f6af84e7	170	pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
439716a5 DH	171	break;
	172	case PGM_ALEN_TRANSLATION:
	173	case PGM_ALE_SEQUENCE:
	174	case PGM_ASTE_INSTANCE:
	175	case PGM_ASTE_SEQUENCE:
	176	case PGM_ASTE_VALIDITY:
	177	case PGM_EXTENDED_AUTHORITY:
f6af84e7	178	pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
439716a5 DH	179	break;
	180	case PGM_ASCE_TYPE:
	181	case PGM_PAGE_TRANSLATION:
	182	case PGM_REGION_FIRST_TRANS:
	183	case PGM_REGION_SECOND_TRANS:
	184	case PGM_REGION_THIRD_TRANS:
	185	case PGM_SEGMENT_TRANSLATION:
f6af84e7 DH	186	pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
	187	pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
	188	pgm_info.op_access_id = vcpu->arch.sie_block->oai;
439716a5 DH	189	break;
439716a5 DH	190	case PGM_MONITOR:
f6af84e7 DH	191	pgm_info.mon_class_nr = vcpu->arch.sie_block->mcn;
f6af84e7 DH	192	pgm_info.mon_code = vcpu->arch.sie_block->tecmc;
439716a5	193	break;
403c8648	194	case PGM_VECTOR_PROCESSING:
439716a5	195	case PGM_DATA:
f6af84e7	196	pgm_info.data_exc_code = vcpu->arch.sie_block->dxc;
439716a5 DH	197	break;
439716a5 DH	198	case PGM_PROTECTION:
f6af84e7 DH	199	pgm_info.trans_exc_code = vcpu->arch.sie_block->tecmc;
f6af84e7 DH	200	pgm_info.exc_access_id = vcpu->arch.sie_block->eai;
439716a5 DH	201	break;
	202	default:
	203	break;
	204	}
	205
	206	if (vcpu->arch.sie_block->iprcc & PGM_PER) {
f6af84e7 DH	207	pgm_info.per_code = vcpu->arch.sie_block->perc;
	208	pgm_info.per_atmid = vcpu->arch.sie_block->peratmid;
	209	pgm_info.per_address = vcpu->arch.sie_block->peraddr;
	210	pgm_info.per_access_id = vcpu->arch.sie_block->peraid;
439716a5	211	}
f6af84e7	212	return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
439716a5 DH	213	}
439716a5 DH	214
e325fe69 MM	215	/*
	216	* restore ITDB to program-interruption TDB in guest lowcore
	217	* and set TX abort indication if required
	218	*/
	219	static int handle_itdb(struct kvm_vcpu *vcpu)
	220	{
	221	struct kvm_s390_itdb *itdb;
	222	int rc;
	223
	224	if (!IS_TE_ENABLED(vcpu) \|\| !IS_ITDB_VALID(vcpu))
	225	return 0;
	226	if (current->thread.per_flags & PER_FLAG_NO_TE)
	227	return 0;
	228	itdb = (struct kvm_s390_itdb *)vcpu->arch.sie_block->itdba;
	229	rc = write_guest_lc(vcpu, __LC_PGM_TDB, itdb, sizeof(*itdb));
	230	if (rc)
	231	return rc;
	232	memset(itdb, 0, sizeof(*itdb));
	233
	234	return 0;
	235	}
	236
27291e21 DH	237	#define per_event(vcpu) (vcpu->arch.sie_block->iprcc & PGM_PER)
27291e21 DH	238
ba5c1e9b CO	239	static int handle_prog(struct kvm_vcpu *vcpu)
ba5c1e9b CO	240	{
684135e0	241	psw_t psw;
0040e7d2 HC	242	int rc;
0040e7d2 HC	243
ba5c1e9b	244	vcpu->stat.exit_program_interruption++;
7feb6bb8	245
27291e21	246	if (guestdbg_enabled(vcpu) && per_event(vcpu)) {
a69cbe81 DH	247	rc = kvm_s390_handle_per_event(vcpu);
	248	if (rc)
	249	return rc;
27291e21 DH	250	/* the interrupt might have been filtered out completely */
	251	if (vcpu->arch.sie_block->iprcc == 0)
	252	return 0;
	253	}
	254
e325fe69	255	trace_kvm_s390_intercept_prog(vcpu, vcpu->arch.sie_block->iprcc);
684135e0 TH	256	if (vcpu->arch.sie_block->iprcc == PGM_SPECIFICATION) {
	257	rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &psw, sizeof(psw_t));
	258	if (rc)
	259	return rc;
	260	/* Avoid endless loops of specification exceptions */
	261	if (!is_valid_psw(&psw))
	262	return -EOPNOTSUPP;
	263	}
e325fe69	264	rc = handle_itdb(vcpu);
0040e7d2 HC	265	if (rc)
0040e7d2 HC	266	return rc;
439716a5	267
f6af84e7	268	return inject_prog_on_prog_intercept(vcpu);
ba5c1e9b CO	269	}
ba5c1e9b CO	270
f14d82e0 TH	271	/**
	272	* handle_external_interrupt - used for external interruption interceptions
	273	*
	274	* This interception only occurs if the CPUSTAT_EXT_INT bit was set, or if
	275	* the new PSW does not have external interrupts disabled. In the first case,
	276	* we've got to deliver the interrupt manually, and in the second case, we
	277	* drop to userspace to handle the situation there.
	278	*/
	279	static int handle_external_interrupt(struct kvm_vcpu *vcpu)
	280	{
	281	u16 eic = vcpu->arch.sie_block->eic;
383d0b05	282	struct kvm_s390_irq irq;
f14d82e0 TH	283	psw_t newpsw;
	284	int rc;
	285
	286	vcpu->stat.exit_external_interrupt++;
	287
	288	rc = read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &newpsw, sizeof(psw_t));
	289	if (rc)
	290	return rc;
	291	/* We can not handle clock comparator or timer interrupt with bad PSW */
	292	if ((eic == EXT_IRQ_CLK_COMP \|\| eic == EXT_IRQ_CPU_TIMER) &&
	293	(newpsw.mask & PSW_MASK_EXT))
	294	return -EOPNOTSUPP;
	295
	296	switch (eic) {
	297	case EXT_IRQ_CLK_COMP:
	298	irq.type = KVM_S390_INT_CLOCK_COMP;
	299	break;
	300	case EXT_IRQ_CPU_TIMER:
	301	irq.type = KVM_S390_INT_CPU_TIMER;
	302	break;
	303	case EXT_IRQ_EXTERNAL_CALL:
	304	irq.type = KVM_S390_INT_EXTERNAL_CALL;
383d0b05	305	irq.u.extcall.code = vcpu->arch.sie_block->extcpuaddr;
ea5f4969 DH	306	rc = kvm_s390_inject_vcpu(vcpu, &irq);
	307	/* ignore if another external call is already pending */
	308	if (rc == -EBUSY)
	309	return 0;
	310	return rc;
f14d82e0 TH	311	default:
	312	return -EOPNOTSUPP;
	313	}
	314
	315	return kvm_s390_inject_vcpu(vcpu, &irq);
	316	}
	317
9a558ee3 TH	318	/**
	319	* Handle MOVE PAGE partial execution interception.
	320	*
	321	* This interception can only happen for guests with DAT disabled and
	322	* addresses that are currently not mapped in the host. Thus we try to
	323	* set up the mappings for the corresponding user pages here (or throw
	324	* addressing exceptions in case of illegal guest addresses).
	325	*/
	326	static int handle_mvpg_pei(struct kvm_vcpu *vcpu)
	327	{
f22166dc	328	unsigned long srcaddr, dstaddr;
9a558ee3 TH	329	int reg1, reg2, rc;
	330
	331	kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
9a558ee3 TH	332
9a558ee3 TH	333	/* Make sure that the source is paged-in */
3cfad023	334	rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg2],
92c96321	335	reg2, &srcaddr, GACC_FETCH);
3cfad023 TH	336	if (rc)
3cfad023 TH	337	return kvm_s390_inject_prog_cond(vcpu, rc);
f22166dc TH	338	rc = kvm_arch_fault_in_page(vcpu, srcaddr, 0);
f22166dc TH	339	if (rc != 0)
9a558ee3 TH	340	return rc;
	341
	342	/* Make sure that the destination is paged-in */
3cfad023	343	rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg1],
92c96321	344	reg1, &dstaddr, GACC_STORE);
3cfad023 TH	345	if (rc)
3cfad023 TH	346	return kvm_s390_inject_prog_cond(vcpu, rc);
f22166dc TH	347	rc = kvm_arch_fault_in_page(vcpu, dstaddr, 1);
f22166dc TH	348	if (rc != 0)
9a558ee3 TH	349	return rc;
9a558ee3 TH	350
0e8bc06a	351	kvm_s390_retry_instr(vcpu);
9a558ee3 TH	352
	353	return 0;
	354	}
	355
	356	static int handle_partial_execution(struct kvm_vcpu *vcpu)
	357	{
9ec6de19 AY	358	vcpu->stat.exit_pei++;
9ec6de19 AY	359
9a558ee3 TH	360	if (vcpu->arch.sie_block->ipa == 0xb254) /* MVPG */
9a558ee3 TH	361	return handle_mvpg_pei(vcpu);
4953919f DH	362	if (vcpu->arch.sie_block->ipa >> 8 == 0xae) /* SIGP */
4953919f DH	363	return kvm_s390_handle_sigp_pei(vcpu);
9a558ee3 TH	364
	365	return -EOPNOTSUPP;
	366	}
	367
b7c92f1a QH	368	/*
	369	* Handle the sthyi instruction that provides the guest with system
	370	* information, like current CPU resources available at each level of
	371	* the machine.
	372	*/
	373	int handle_sthyi(struct kvm_vcpu *vcpu)
	374	{
	375	int reg1, reg2, r = 0;
	376	u64 code, addr, cc = 0, rc = 0;
	377	struct sthyi_sctns *sctns = NULL;
	378
	379	if (!test_kvm_facility(vcpu->kvm, 74))
	380	return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
	381
b7c92f1a QH	382	kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
	383	code = vcpu->run->s.regs.gprs[reg1];
	384	addr = vcpu->run->s.regs.gprs[reg2];
	385
	386	vcpu->stat.instruction_sthyi++;
	387	VCPU_EVENT(vcpu, 3, "STHYI: fc: %llu addr: 0x%016llx", code, addr);
	388	trace_kvm_s390_handle_sthyi(vcpu, code, addr);
	389
	390	if (reg1 == reg2 \|\| reg1 & 1 \|\| reg2 & 1)
	391	return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
	392
	393	if (code & 0xffff) {
	394	cc = 3;
	395	rc = 4;
	396	goto out;
	397	}
	398
	399	if (addr & ~PAGE_MASK)
	400	return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
	401
	402	sctns = (void *)get_zeroed_page(GFP_KERNEL);
	403	if (!sctns)
	404	return -ENOMEM;
	405
	406	cc = sthyi_fill(sctns, &rc);
	407
	408	out:
	409	if (!cc) {
	410	r = write_guest(vcpu, addr, reg2, sctns, PAGE_SIZE);
	411	if (r) {
	412	free_page((unsigned long)sctns);
	413	return kvm_s390_inject_prog_cond(vcpu, r);
	414	}
	415	}
	416
	417	free_page((unsigned long)sctns);
	418	vcpu->run->s.regs.gprs[reg2 + 1] = rc;
	419	kvm_s390_set_psw_cc(vcpu, cc);
	420	return r;
	421	}
	422
a011eeb2 JF	423	static int handle_operexc(struct kvm_vcpu *vcpu)
a011eeb2 JF	424	{
fb7dc1d4 CB	425	psw_t oldpsw, newpsw;
	426	int rc;
	427
a011eeb2 JF	428	vcpu->stat.exit_operation_exception++;
	429	trace_kvm_s390_handle_operexc(vcpu, vcpu->arch.sie_block->ipa,
	430	vcpu->arch.sie_block->ipb);
	431
c0a6bfdc	432	if (vcpu->arch.sie_block->ipa == 0xb256)
95ca2cb5 JF	433	return handle_sthyi(vcpu);
95ca2cb5 JF	434
6502a34c DH	435	if (vcpu->arch.sie_block->ipa == 0 && vcpu->kvm->arch.user_instr0)
6502a34c DH	436	return -EOPNOTSUPP;
fb7dc1d4 CB	437	rc = read_guest_lc(vcpu, __LC_PGM_NEW_PSW, &newpsw, sizeof(psw_t));
	438	if (rc)
	439	return rc;
	440	/*
	441	* Avoid endless loops of operation exceptions, if the pgm new
	442	* PSW will cause a new operation exception.
	443	* The heuristic checks if the pgm new psw is within 6 bytes before
	444	* the faulting psw address (with same DAT, AS settings) and the
	445	* new psw is not a wait psw and the fault was not triggered by
	446	* problem state.
	447	*/
	448	oldpsw = vcpu->arch.sie_block->gpsw;
	449	if (oldpsw.addr - newpsw.addr <= 6 &&
	450	!(newpsw.mask & PSW_MASK_WAIT) &&
	451	!(oldpsw.mask & PSW_MASK_PSTATE) &&
	452	(newpsw.mask & PSW_MASK_ASC) == (oldpsw.mask & PSW_MASK_ASC) &&
	453	(newpsw.mask & PSW_MASK_DAT) == (oldpsw.mask & PSW_MASK_DAT))
	454	return -EOPNOTSUPP;
6502a34c	455
a011eeb2 JF	456	return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
	457	}
	458
8f2abe6a CB	459	int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
8f2abe6a CB	460	{
5ffe466c DH	461	int rc, per_rc = 0;
5ffe466c DH	462
71f116bf DH	463	if (kvm_is_ucontrol(vcpu->kvm))
	464	return -EOPNOTSUPP;
	465
46b708ea	466	switch (vcpu->arch.sie_block->icptcode) {
947b8972 FA	467	case ICPT_EXTREQ:
947b8972 FA	468	case ICPT_IOREQ:
46b708ea	469	return handle_noop(vcpu);
947b8972	470	case ICPT_INST:
5ffe466c DH	471	rc = handle_instruction(vcpu);
5ffe466c DH	472	break;
947b8972	473	case ICPT_PROGI:
46b708ea	474	return handle_prog(vcpu);
947b8972	475	case ICPT_EXTINT:
46b708ea	476	return handle_external_interrupt(vcpu);
947b8972	477	case ICPT_WAIT:
46b708ea	478	return kvm_s390_handle_wait(vcpu);
947b8972	479	case ICPT_VALIDITY:
46b708ea	480	return handle_validity(vcpu);
947b8972	481	case ICPT_STOP:
46b708ea	482	return handle_stop(vcpu);
947b8972	483	case ICPT_OPEREXC:
5ffe466c DH	484	rc = handle_operexc(vcpu);
5ffe466c DH	485	break;
947b8972	486	case ICPT_PARTEXEC:
5ffe466c DH	487	rc = handle_partial_execution(vcpu);
5ffe466c DH	488	break;
730cd632 FA	489	case ICPT_KSS:
	490	rc = kvm_s390_skey_check_enable(vcpu);
	491	break;
46b708ea	492	default:
b8e660b8	493	return -EOPNOTSUPP;
46b708ea	494	}
5ffe466c DH	495
	496	/* process PER, also if the instrution is processed in user space */
	497	if (vcpu->arch.sie_block->icptstatus & 0x02 &&
	498	(!rc \|\| rc == -EOPNOTSUPP))
	499	per_rc = kvm_s390_handle_per_ifetch_icpt(vcpu);
	500	return per_rc ? per_rc : rc;
8f2abe6a	501	}