1/*
   2 * handling kvm guest interrupts
   3 *
   4 * Copyright IBM Corp. 2008, 2015
   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 */
  12
  13#include <linux/interrupt.h>
  14#include <linux/kvm_host.h>
  15#include <linux/hrtimer.h>
  16#include <linux/mmu_context.h>
  17#include <linux/signal.h>
  18#include <linux/slab.h>
  19#include <linux/bitmap.h>
  20#include <linux/vmalloc.h>
  21#include <asm/asm-offsets.h>
  22#include <asm/dis.h>
  23#include <linux/uaccess.h>
  24#include <asm/sclp.h>
  25#include <asm/isc.h>
  26#include <asm/gmap.h>
  27#include <asm/switch_to.h>
  28#include <asm/nmi.h>
  29#include "kvm-s390.h"
  30#include "gaccess.h"
  31#include "trace-s390.h"
  32
 
 
 
  33#define PFAULT_INIT 0x0600
  34#define PFAULT_DONE 0x0680
  35#define VIRTIO_PARAM 0x0d00
  36
  37/* handle external calls via sigp interpretation facility */
  38static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id)
  39{
  40	int c, scn;
  41
  42	if (!(atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND))
  43		return 0;
  44
  45	BUG_ON(!kvm_s390_use_sca_entries());
  46	read_lock(&vcpu->kvm->arch.sca_lock);
  47	if (vcpu->kvm->arch.use_esca) {
  48		struct esca_block *sca = vcpu->kvm->arch.sca;
  49		union esca_sigp_ctrl sigp_ctrl =
  50			sca->cpu[vcpu->vcpu_id].sigp_ctrl;
  51
  52		c = sigp_ctrl.c;
  53		scn = sigp_ctrl.scn;
  54	} else {
  55		struct bsca_block *sca = vcpu->kvm->arch.sca;
  56		union bsca_sigp_ctrl sigp_ctrl =
  57			sca->cpu[vcpu->vcpu_id].sigp_ctrl;
  58
  59		c = sigp_ctrl.c;
  60		scn = sigp_ctrl.scn;
  61	}
  62	read_unlock(&vcpu->kvm->arch.sca_lock);
  63
  64	if (src_id)
  65		*src_id = scn;
  66
  67	return c;
  68}
  69
  70static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id)
  71{
  72	int expect, rc;
  73
  74	BUG_ON(!kvm_s390_use_sca_entries());
  75	read_lock(&vcpu->kvm->arch.sca_lock);
  76	if (vcpu->kvm->arch.use_esca) {
  77		struct esca_block *sca = vcpu->kvm->arch.sca;
  78		union esca_sigp_ctrl *sigp_ctrl =
  79			&(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
  80		union esca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
  81
  82		new_val.scn = src_id;
  83		new_val.c = 1;
  84		old_val.c = 0;
  85
  86		expect = old_val.value;
  87		rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
  88	} else {
  89		struct bsca_block *sca = vcpu->kvm->arch.sca;
  90		union bsca_sigp_ctrl *sigp_ctrl =
  91			&(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
  92		union bsca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
  93
  94		new_val.scn = src_id;
  95		new_val.c = 1;
  96		old_val.c = 0;
  97
  98		expect = old_val.value;
  99		rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
 100	}
 101	read_unlock(&vcpu->kvm->arch.sca_lock);
 102
 103	if (rc != expect) {
 104		/* another external call is pending */
 105		return -EBUSY;
 106	}
 107	atomic_or(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
 108	return 0;
 109}
 110
 111static void sca_clear_ext_call(struct kvm_vcpu *vcpu)
 112{
 113	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 114	int rc, expect;
 115
 116	if (!kvm_s390_use_sca_entries())
 117		return;
 118	atomic_andnot(CPUSTAT_ECALL_PEND, li->cpuflags);
 119	read_lock(&vcpu->kvm->arch.sca_lock);
 120	if (vcpu->kvm->arch.use_esca) {
 121		struct esca_block *sca = vcpu->kvm->arch.sca;
 122		union esca_sigp_ctrl *sigp_ctrl =
 123			&(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
 124		union esca_sigp_ctrl old = *sigp_ctrl;
 125
 126		expect = old.value;
 127		rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
 128	} else {
 129		struct bsca_block *sca = vcpu->kvm->arch.sca;
 130		union bsca_sigp_ctrl *sigp_ctrl =
 131			&(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
 132		union bsca_sigp_ctrl old = *sigp_ctrl;
 133
 134		expect = old.value;
 135		rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
 136	}
 137	read_unlock(&vcpu->kvm->arch.sca_lock);
 138	WARN_ON(rc != expect); /* cannot clear? */
 139}
 140
 141int psw_extint_disabled(struct kvm_vcpu *vcpu)
 142{
 143	return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
 144}
 145
 146static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
 147{
 148	return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
 149}
 150
 151static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
 152{
 153	return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
 154}
 155
 156static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
 157{
 158	return psw_extint_disabled(vcpu) &&
 159	       psw_ioint_disabled(vcpu) &&
 160	       psw_mchk_disabled(vcpu);
 161}
 162
 163static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
 164{
 165	if (psw_extint_disabled(vcpu) ||
 166	    !(vcpu->arch.sie_block->gcr[0] & 0x800ul))
 167		return 0;
 168	if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
 169		/* No timer interrupts when single stepping */
 170		return 0;
 171	return 1;
 172}
 173
 174static int ckc_irq_pending(struct kvm_vcpu *vcpu)
 175{
 176	if (vcpu->arch.sie_block->ckc >= kvm_s390_get_tod_clock_fast(vcpu->kvm))
 177		return 0;
 178	return ckc_interrupts_enabled(vcpu);
 179}
 180
 181static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
 182{
 183	return !psw_extint_disabled(vcpu) &&
 184	       (vcpu->arch.sie_block->gcr[0] & 0x400ul);
 185}
 186
 187static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
 188{
 189	if (!cpu_timer_interrupts_enabled(vcpu))
 190		return 0;
 191	return kvm_s390_get_cpu_timer(vcpu) >> 63;
 192}
 193
 194static inline int is_ioirq(unsigned long irq_type)
 195{
 196	return ((irq_type >= IRQ_PEND_IO_ISC_0) &&
 197		(irq_type <= IRQ_PEND_IO_ISC_7));
 198}
 199
 200static uint64_t isc_to_isc_bits(int isc)
 201{
 202	return (0x80 >> isc) << 24;
 203}
 204
 205static inline u8 int_word_to_isc(u32 int_word)
 206{
 207	return (int_word & 0x38000000) >> 27;
 208}
 209
 210static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
 211{
 212	return vcpu->kvm->arch.float_int.pending_irqs |
 213	       vcpu->arch.local_int.pending_irqs;
 214}
 215
 216static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
 217				   unsigned long active_mask)
 218{
 219	int i;
 220
 221	for (i = 0; i <= MAX_ISC; i++)
 222		if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
 223			active_mask &= ~(1UL << (IRQ_PEND_IO_ISC_0 + i));
 224
 225	return active_mask;
 226}
 227
 228static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
 229{
 230	unsigned long active_mask;
 231
 232	active_mask = pending_irqs(vcpu);
 233	if (!active_mask)
 234		return 0;
 235
 236	if (psw_extint_disabled(vcpu))
 237		active_mask &= ~IRQ_PEND_EXT_MASK;
 238	if (psw_ioint_disabled(vcpu))
 239		active_mask &= ~IRQ_PEND_IO_MASK;
 240	else
 241		active_mask = disable_iscs(vcpu, active_mask);
 242	if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
 243		__clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
 244	if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
 245		__clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
 246	if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
 247		__clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
 248	if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
 249		__clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
 250	if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
 251		__clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
 252	if (psw_mchk_disabled(vcpu))
 253		active_mask &= ~IRQ_PEND_MCHK_MASK;
 254	if (!(vcpu->arch.sie_block->gcr[14] &
 255	      vcpu->kvm->arch.float_int.mchk.cr14))
 256		__clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
 257
 258	/*
 259	 * STOP irqs will never be actively delivered. They are triggered via
 260	 * intercept requests and cleared when the stop intercept is performed.
 261	 */
 262	__clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
 263
 264	return active_mask;
 265}
 266
 267static void __set_cpu_idle(struct kvm_vcpu *vcpu)
 268{
 269	atomic_or(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 270	set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 271}
 272
 273static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
 274{
 275	atomic_andnot(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
 276	clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
 277}
 278
 279static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
 280{
 281	atomic_andnot(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
 282		    &vcpu->arch.sie_block->cpuflags);
 283	vcpu->arch.sie_block->lctl = 0x0000;
 284	vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
 285
 286	if (guestdbg_enabled(vcpu)) {
 287		vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
 288					       LCTL_CR10 | LCTL_CR11);
 289		vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
 290	}
 291}
 292
 293static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
 294{
 295	atomic_or(flag, &vcpu->arch.sie_block->cpuflags);
 296}
 297
 298static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
 299{
 300	if (!(pending_irqs(vcpu) & IRQ_PEND_IO_MASK))
 301		return;
 302	else if (psw_ioint_disabled(vcpu))
 303		__set_cpuflag(vcpu, CPUSTAT_IO_INT);
 304	else
 305		vcpu->arch.sie_block->lctl |= LCTL_CR6;
 306}
 307
 308static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
 309{
 310	if (!(pending_irqs(vcpu) & IRQ_PEND_EXT_MASK))
 311		return;
 312	if (psw_extint_disabled(vcpu))
 313		__set_cpuflag(vcpu, CPUSTAT_EXT_INT);
 314	else
 315		vcpu->arch.sie_block->lctl |= LCTL_CR0;
 316}
 317
 318static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
 319{
 320	if (!(pending_irqs(vcpu) & IRQ_PEND_MCHK_MASK))
 321		return;
 322	if (psw_mchk_disabled(vcpu))
 323		vcpu->arch.sie_block->ictl |= ICTL_LPSW;
 324	else
 325		vcpu->arch.sie_block->lctl |= LCTL_CR14;
 326}
 327
 328static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
 329{
 330	if (kvm_s390_is_stop_irq_pending(vcpu))
 331		__set_cpuflag(vcpu, CPUSTAT_STOP_INT);
 332}
 333
 334/* Set interception request for non-deliverable interrupts */
 335static void set_intercept_indicators(struct kvm_vcpu *vcpu)
 336{
 337	set_intercept_indicators_io(vcpu);
 338	set_intercept_indicators_ext(vcpu);
 339	set_intercept_indicators_mchk(vcpu);
 340	set_intercept_indicators_stop(vcpu);
 341}
 342
 343static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
 344{
 345	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 346	int rc;
 347
 348	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
 349					 0, 0);
 350
 351	rc  = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
 352			   (u16 *)__LC_EXT_INT_CODE);
 353	rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
 354	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 355			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 356	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 357			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 358	clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
 359	return rc ? -EFAULT : 0;
 360}
 361
 362static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
 363{
 364	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 365	int rc;
 366
 367	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
 368					 0, 0);
 369
 370	rc  = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
 371			   (u16 __user *)__LC_EXT_INT_CODE);
 372	rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
 373	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 374			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 375	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 376			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 377	clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
 378	return rc ? -EFAULT : 0;
 379}
 380
 381static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
 382{
 383	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 384	struct kvm_s390_ext_info ext;
 385	int rc;
 386
 387	spin_lock(&li->lock);
 388	ext = li->irq.ext;
 389	clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
 390	li->irq.ext.ext_params2 = 0;
 391	spin_unlock(&li->lock);
 392
 393	VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
 394		   ext.ext_params2);
 395	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 396					 KVM_S390_INT_PFAULT_INIT,
 397					 0, ext.ext_params2);
 398
 399	rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
 400	rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
 401	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 402			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 403	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 404			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 405	rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
 406	return rc ? -EFAULT : 0;
 407}
 408
 409static int __write_machine_check(struct kvm_vcpu *vcpu,
 410				 struct kvm_s390_mchk_info *mchk)
 411{
 412	unsigned long ext_sa_addr;
 413	freg_t fprs[NUM_FPRS];
 414	union mci mci;
 415	int rc;
 416
 417	mci.val = mchk->mcic;
 418	/* take care of lazy register loading */
 419	save_fpu_regs();
 420	save_access_regs(vcpu->run->s.regs.acrs);
 421
 422	/* Extended save area */
 423	rc = read_guest_lc(vcpu, __LC_VX_SAVE_AREA_ADDR, &ext_sa_addr,
 424			    sizeof(unsigned long));
 425	/* Only bits 0-53 are used for address formation */
 426	ext_sa_addr &= ~0x3ffUL;
 427	if (!rc && mci.vr && ext_sa_addr && test_kvm_facility(vcpu->kvm, 129)) {
 428		if (write_guest_abs(vcpu, ext_sa_addr, vcpu->run->s.regs.vrs,
 429				    512))
 430			mci.vr = 0;
 431	} else {
 432		mci.vr = 0;
 433	}
 434
 435	/* General interruption information */
 436	rc |= put_guest_lc(vcpu, 1, (u8 __user *) __LC_AR_MODE_ID);
 437	rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
 438			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 439	rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
 440			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 441	rc |= put_guest_lc(vcpu, mci.val, (u64 __user *) __LC_MCCK_CODE);
 442
 443	/* Register-save areas */
 444	if (MACHINE_HAS_VX) {
 445		convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
 446		rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA, fprs, 128);
 447	} else {
 448		rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA,
 449				     vcpu->run->s.regs.fprs, 128);
 450	}
 451	rc |= write_guest_lc(vcpu, __LC_GPREGS_SAVE_AREA,
 452			     vcpu->run->s.regs.gprs, 128);
 453	rc |= put_guest_lc(vcpu, current->thread.fpu.fpc,
 454			   (u32 __user *) __LC_FP_CREG_SAVE_AREA);
 455	rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->todpr,
 456			   (u32 __user *) __LC_TOD_PROGREG_SAVE_AREA);
 457	rc |= put_guest_lc(vcpu, kvm_s390_get_cpu_timer(vcpu),
 458			   (u64 __user *) __LC_CPU_TIMER_SAVE_AREA);
 459	rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->ckc >> 8,
 460			   (u64 __user *) __LC_CLOCK_COMP_SAVE_AREA);
 461	rc |= write_guest_lc(vcpu, __LC_AREGS_SAVE_AREA,
 462			     &vcpu->run->s.regs.acrs, 64);
 463	rc |= write_guest_lc(vcpu, __LC_CREGS_SAVE_AREA,
 464			     &vcpu->arch.sie_block->gcr, 128);
 465
 466	/* Extended interruption information */
 467	rc |= put_guest_lc(vcpu, mchk->ext_damage_code,
 468			   (u32 __user *) __LC_EXT_DAMAGE_CODE);
 469	rc |= put_guest_lc(vcpu, mchk->failing_storage_address,
 470			   (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
 471	rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA, &mchk->fixed_logout,
 472			     sizeof(mchk->fixed_logout));
 473	return rc ? -EFAULT : 0;
 474}
 475
 476static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
 477{
 478	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 479	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 480	struct kvm_s390_mchk_info mchk = {};
 
 481	int deliver = 0;
 482	int rc = 0;
 483
 484	spin_lock(&fi->lock);
 485	spin_lock(&li->lock);
 486	if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
 487	    test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
 488		/*
 489		 * If there was an exigent machine check pending, then any
 490		 * repressible machine checks that might have been pending
 491		 * are indicated along with it, so always clear bits for
 492		 * repressible and exigent interrupts
 493		 */
 494		mchk = li->irq.mchk;
 495		clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
 496		clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
 497		memset(&li->irq.mchk, 0, sizeof(mchk));
 498		deliver = 1;
 499	}
 500	/*
 501	 * We indicate floating repressible conditions along with
 502	 * other pending conditions. Channel Report Pending and Channel
 503	 * Subsystem damage are the only two and and are indicated by
 504	 * bits in mcic and masked in cr14.
 505	 */
 506	if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
 507		mchk.mcic |= fi->mchk.mcic;
 508		mchk.cr14 |= fi->mchk.cr14;
 509		memset(&fi->mchk, 0, sizeof(mchk));
 510		deliver = 1;
 511	}
 512	spin_unlock(&li->lock);
 513	spin_unlock(&fi->lock);
 514
 515	if (deliver) {
 516		VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
 517			   mchk.mcic);
 518		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 519						 KVM_S390_MCHK,
 520						 mchk.cr14, mchk.mcic);
 521		rc = __write_machine_check(vcpu, &mchk);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 522	}
 523	return rc;
 524}
 525
 526static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
 527{
 528	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 529	int rc;
 530
 531	VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
 532	vcpu->stat.deliver_restart_signal++;
 533	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
 534
 535	rc  = write_guest_lc(vcpu,
 536			     offsetof(struct lowcore, restart_old_psw),
 537			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 538	rc |= read_guest_lc(vcpu, offsetof(struct lowcore, restart_psw),
 539			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 540	clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
 541	return rc ? -EFAULT : 0;
 542}
 543
 544static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
 545{
 546	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 547	struct kvm_s390_prefix_info prefix;
 548
 549	spin_lock(&li->lock);
 550	prefix = li->irq.prefix;
 551	li->irq.prefix.address = 0;
 552	clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
 553	spin_unlock(&li->lock);
 554
 555	vcpu->stat.deliver_prefix_signal++;
 556	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 557					 KVM_S390_SIGP_SET_PREFIX,
 558					 prefix.address, 0);
 559
 560	kvm_s390_set_prefix(vcpu, prefix.address);
 561	return 0;
 562}
 563
 564static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
 565{
 566	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 567	int rc;
 568	int cpu_addr;
 569
 570	spin_lock(&li->lock);
 571	cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
 572	clear_bit(cpu_addr, li->sigp_emerg_pending);
 573	if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
 574		clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
 575	spin_unlock(&li->lock);
 576
 577	VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
 578	vcpu->stat.deliver_emergency_signal++;
 579	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
 580					 cpu_addr, 0);
 581
 582	rc  = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
 583			   (u16 *)__LC_EXT_INT_CODE);
 584	rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
 585	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 586			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 587	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 588			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 589	return rc ? -EFAULT : 0;
 590}
 591
 592static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
 593{
 594	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 595	struct kvm_s390_extcall_info extcall;
 596	int rc;
 597
 598	spin_lock(&li->lock);
 599	extcall = li->irq.extcall;
 600	li->irq.extcall.code = 0;
 601	clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
 602	spin_unlock(&li->lock);
 603
 604	VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
 605	vcpu->stat.deliver_external_call++;
 606	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 607					 KVM_S390_INT_EXTERNAL_CALL,
 608					 extcall.code, 0);
 609
 610	rc  = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
 611			   (u16 *)__LC_EXT_INT_CODE);
 612	rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
 613	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 614			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 615	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
 616			    sizeof(psw_t));
 617	return rc ? -EFAULT : 0;
 618}
 619
 620static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
 621{
 622	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 623	struct kvm_s390_pgm_info pgm_info;
 624	int rc = 0, nullifying = false;
 625	u16 ilen;
 626
 627	spin_lock(&li->lock);
 628	pgm_info = li->irq.pgm;
 629	clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
 630	memset(&li->irq.pgm, 0, sizeof(pgm_info));
 631	spin_unlock(&li->lock);
 632
 633	ilen = pgm_info.flags & KVM_S390_PGM_FLAGS_ILC_MASK;
 634	VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilen:%d",
 635		   pgm_info.code, ilen);
 636	vcpu->stat.deliver_program_int++;
 637	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
 638					 pgm_info.code, 0);
 639
 640	switch (pgm_info.code & ~PGM_PER) {
 641	case PGM_AFX_TRANSLATION:
 642	case PGM_ASX_TRANSLATION:
 643	case PGM_EX_TRANSLATION:
 644	case PGM_LFX_TRANSLATION:
 645	case PGM_LSTE_SEQUENCE:
 646	case PGM_LSX_TRANSLATION:
 647	case PGM_LX_TRANSLATION:
 648	case PGM_PRIMARY_AUTHORITY:
 649	case PGM_SECONDARY_AUTHORITY:
 650		nullifying = true;
 651		/* fall through */
 652	case PGM_SPACE_SWITCH:
 653		rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
 654				  (u64 *)__LC_TRANS_EXC_CODE);
 655		break;
 656	case PGM_ALEN_TRANSLATION:
 657	case PGM_ALE_SEQUENCE:
 658	case PGM_ASTE_INSTANCE:
 659	case PGM_ASTE_SEQUENCE:
 660	case PGM_ASTE_VALIDITY:
 661	case PGM_EXTENDED_AUTHORITY:
 662		rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
 663				  (u8 *)__LC_EXC_ACCESS_ID);
 664		nullifying = true;
 665		break;
 666	case PGM_ASCE_TYPE:
 667	case PGM_PAGE_TRANSLATION:
 668	case PGM_REGION_FIRST_TRANS:
 669	case PGM_REGION_SECOND_TRANS:
 670	case PGM_REGION_THIRD_TRANS:
 671	case PGM_SEGMENT_TRANSLATION:
 672		rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
 673				  (u64 *)__LC_TRANS_EXC_CODE);
 674		rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
 675				   (u8 *)__LC_EXC_ACCESS_ID);
 676		rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
 677				   (u8 *)__LC_OP_ACCESS_ID);
 678		nullifying = true;
 679		break;
 680	case PGM_MONITOR:
 681		rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
 682				  (u16 *)__LC_MON_CLASS_NR);
 683		rc |= put_guest_lc(vcpu, pgm_info.mon_code,
 684				   (u64 *)__LC_MON_CODE);
 685		break;
 686	case PGM_VECTOR_PROCESSING:
 687	case PGM_DATA:
 688		rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
 689				  (u32 *)__LC_DATA_EXC_CODE);
 690		break;
 691	case PGM_PROTECTION:
 692		rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
 693				  (u64 *)__LC_TRANS_EXC_CODE);
 694		rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
 695				   (u8 *)__LC_EXC_ACCESS_ID);
 696		break;
 697	case PGM_STACK_FULL:
 698	case PGM_STACK_EMPTY:
 699	case PGM_STACK_SPECIFICATION:
 700	case PGM_STACK_TYPE:
 701	case PGM_STACK_OPERATION:
 702	case PGM_TRACE_TABEL:
 703	case PGM_CRYPTO_OPERATION:
 704		nullifying = true;
 705		break;
 706	}
 707
 708	if (pgm_info.code & PGM_PER) {
 709		rc |= put_guest_lc(vcpu, pgm_info.per_code,
 710				   (u8 *) __LC_PER_CODE);
 711		rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
 712				   (u8 *)__LC_PER_ATMID);
 713		rc |= put_guest_lc(vcpu, pgm_info.per_address,
 714				   (u64 *) __LC_PER_ADDRESS);
 715		rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
 716				   (u8 *) __LC_PER_ACCESS_ID);
 717	}
 718
 719	if (nullifying && !(pgm_info.flags & KVM_S390_PGM_FLAGS_NO_REWIND))
 720		kvm_s390_rewind_psw(vcpu, ilen);
 721
 722	/* bit 1+2 of the target are the ilc, so we can directly use ilen */
 723	rc |= put_guest_lc(vcpu, ilen, (u16 *) __LC_PGM_ILC);
 724	rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
 725				 (u64 *) __LC_LAST_BREAK);
 726	rc |= put_guest_lc(vcpu, pgm_info.code,
 727			   (u16 *)__LC_PGM_INT_CODE);
 728	rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
 729			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 730	rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
 731			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 732	return rc ? -EFAULT : 0;
 733}
 734
 735static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
 736{
 737	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 738	struct kvm_s390_ext_info ext;
 739	int rc = 0;
 740
 741	spin_lock(&fi->lock);
 742	if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
 743		spin_unlock(&fi->lock);
 744		return 0;
 745	}
 746	ext = fi->srv_signal;
 747	memset(&fi->srv_signal, 0, sizeof(ext));
 748	clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
 749	spin_unlock(&fi->lock);
 750
 751	VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
 752		   ext.ext_params);
 753	vcpu->stat.deliver_service_signal++;
 754	trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
 755					 ext.ext_params, 0);
 756
 757	rc  = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
 758	rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
 759	rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 760			     &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 761	rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 762			    &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
 763	rc |= put_guest_lc(vcpu, ext.ext_params,
 764			   (u32 *)__LC_EXT_PARAMS);
 765
 766	return rc ? -EFAULT : 0;
 767}
 768
 769static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
 770{
 771	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 772	struct kvm_s390_interrupt_info *inti;
 773	int rc = 0;
 774
 775	spin_lock(&fi->lock);
 776	inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
 777					struct kvm_s390_interrupt_info,
 778					list);
 779	if (inti) {
 780		list_del(&inti->list);
 781		fi->counters[FIRQ_CNTR_PFAULT] -= 1;
 782	}
 783	if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
 784		clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
 785	spin_unlock(&fi->lock);
 786
 787	if (inti) {
 788		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 789						 KVM_S390_INT_PFAULT_DONE, 0,
 790						 inti->ext.ext_params2);
 791		VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
 792			   inti->ext.ext_params2);
 793
 794		rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
 795				(u16 *)__LC_EXT_INT_CODE);
 796		rc |= put_guest_lc(vcpu, PFAULT_DONE,
 797				(u16 *)__LC_EXT_CPU_ADDR);
 798		rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 799				&vcpu->arch.sie_block->gpsw,
 800				sizeof(psw_t));
 801		rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 802				&vcpu->arch.sie_block->gpsw,
 803				sizeof(psw_t));
 804		rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 805				(u64 *)__LC_EXT_PARAMS2);
 806		kfree(inti);
 807	}
 808	return rc ? -EFAULT : 0;
 809}
 810
 811static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
 812{
 813	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 814	struct kvm_s390_interrupt_info *inti;
 815	int rc = 0;
 816
 817	spin_lock(&fi->lock);
 818	inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
 819					struct kvm_s390_interrupt_info,
 820					list);
 821	if (inti) {
 822		VCPU_EVENT(vcpu, 4,
 823			   "deliver: virtio parm: 0x%x,parm64: 0x%llx",
 824			   inti->ext.ext_params, inti->ext.ext_params2);
 825		vcpu->stat.deliver_virtio_interrupt++;
 826		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 827				inti->type,
 828				inti->ext.ext_params,
 829				inti->ext.ext_params2);
 830		list_del(&inti->list);
 831		fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
 832	}
 833	if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
 834		clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
 835	spin_unlock(&fi->lock);
 836
 837	if (inti) {
 838		rc  = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
 839				(u16 *)__LC_EXT_INT_CODE);
 840		rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
 841				(u16 *)__LC_EXT_CPU_ADDR);
 842		rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
 843				&vcpu->arch.sie_block->gpsw,
 844				sizeof(psw_t));
 845		rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
 846				&vcpu->arch.sie_block->gpsw,
 847				sizeof(psw_t));
 848		rc |= put_guest_lc(vcpu, inti->ext.ext_params,
 849				(u32 *)__LC_EXT_PARAMS);
 850		rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
 851				(u64 *)__LC_EXT_PARAMS2);
 852		kfree(inti);
 853	}
 854	return rc ? -EFAULT : 0;
 855}
 856
 857static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
 858				     unsigned long irq_type)
 859{
 860	struct list_head *isc_list;
 861	struct kvm_s390_float_interrupt *fi;
 862	struct kvm_s390_interrupt_info *inti = NULL;
 863	int rc = 0;
 864
 865	fi = &vcpu->kvm->arch.float_int;
 866
 867	spin_lock(&fi->lock);
 868	isc_list = &fi->lists[irq_type - IRQ_PEND_IO_ISC_0];
 869	inti = list_first_entry_or_null(isc_list,
 870					struct kvm_s390_interrupt_info,
 871					list);
 872	if (inti) {
 873		if (inti->type & KVM_S390_INT_IO_AI_MASK)
 874			VCPU_EVENT(vcpu, 4, "%s", "deliver: I/O (AI)");
 875		else
 876			VCPU_EVENT(vcpu, 4, "deliver: I/O %x ss %x schid %04x",
 877			inti->io.subchannel_id >> 8,
 878			inti->io.subchannel_id >> 1 & 0x3,
 879			inti->io.subchannel_nr);
 880
 881		vcpu->stat.deliver_io_int++;
 882		trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
 883				inti->type,
 884				((__u32)inti->io.subchannel_id << 16) |
 885				inti->io.subchannel_nr,
 886				((__u64)inti->io.io_int_parm << 32) |
 887				inti->io.io_int_word);
 888		list_del(&inti->list);
 889		fi->counters[FIRQ_CNTR_IO] -= 1;
 890	}
 891	if (list_empty(isc_list))
 892		clear_bit(irq_type, &fi->pending_irqs);
 893	spin_unlock(&fi->lock);
 894
 895	if (inti) {
 896		rc  = put_guest_lc(vcpu, inti->io.subchannel_id,
 897				(u16 *)__LC_SUBCHANNEL_ID);
 898		rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
 899				(u16 *)__LC_SUBCHANNEL_NR);
 900		rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
 901				(u32 *)__LC_IO_INT_PARM);
 902		rc |= put_guest_lc(vcpu, inti->io.io_int_word,
 903				(u32 *)__LC_IO_INT_WORD);
 904		rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
 905				&vcpu->arch.sie_block->gpsw,
 906				sizeof(psw_t));
 907		rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
 908				&vcpu->arch.sie_block->gpsw,
 909				sizeof(psw_t));
 910		kfree(inti);
 911	}
 912
 913	return rc ? -EFAULT : 0;
 914}
 915
 916typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);
 917
 918static const deliver_irq_t deliver_irq_funcs[] = {
 919	[IRQ_PEND_MCHK_EX]        = __deliver_machine_check,
 920	[IRQ_PEND_MCHK_REP]       = __deliver_machine_check,
 921	[IRQ_PEND_PROG]           = __deliver_prog,
 922	[IRQ_PEND_EXT_EMERGENCY]  = __deliver_emergency_signal,
 923	[IRQ_PEND_EXT_EXTERNAL]   = __deliver_external_call,
 924	[IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc,
 925	[IRQ_PEND_EXT_CPU_TIMER]  = __deliver_cpu_timer,
 926	[IRQ_PEND_RESTART]        = __deliver_restart,
 927	[IRQ_PEND_SET_PREFIX]     = __deliver_set_prefix,
 928	[IRQ_PEND_PFAULT_INIT]    = __deliver_pfault_init,
 929	[IRQ_PEND_EXT_SERVICE]    = __deliver_service,
 930	[IRQ_PEND_PFAULT_DONE]    = __deliver_pfault_done,
 931	[IRQ_PEND_VIRTIO]         = __deliver_virtio,
 932};
 933
 934/* Check whether an external call is pending (deliverable or not) */
 935int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
 936{
 937	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
 938
 939	if (!sclp.has_sigpif)
 940		return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
 941
 942	return sca_ext_call_pending(vcpu, NULL);
 943}
 944
 945int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
 946{
 947	if (deliverable_irqs(vcpu))
 948		return 1;
 949
 950	if (kvm_cpu_has_pending_timer(vcpu))
 951		return 1;
 952
 953	/* external call pending and deliverable */
 954	if (kvm_s390_ext_call_pending(vcpu) &&
 955	    !psw_extint_disabled(vcpu) &&
 956	    (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
 957		return 1;
 958
 959	if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
 960		return 1;
 961	return 0;
 962}
 963
 964int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 965{
 966	return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
 967}
 968
 969static u64 __calculate_sltime(struct kvm_vcpu *vcpu)
 970{
 971	u64 now, cputm, sltime = 0;
 972
 973	if (ckc_interrupts_enabled(vcpu)) {
 974		now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
 975		sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
 976		/* already expired or overflow? */
 977		if (!sltime || vcpu->arch.sie_block->ckc <= now)
 978			return 0;
 979		if (cpu_timer_interrupts_enabled(vcpu)) {
 980			cputm = kvm_s390_get_cpu_timer(vcpu);
 981			/* already expired? */
 982			if (cputm >> 63)
 983				return 0;
 984			return min(sltime, tod_to_ns(cputm));
 985		}
 986	} else if (cpu_timer_interrupts_enabled(vcpu)) {
 987		sltime = kvm_s390_get_cpu_timer(vcpu);
 988		/* already expired? */
 989		if (sltime >> 63)
 990			return 0;
 991	}
 992	return sltime;
 993}
 994
 995int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
 996{
 997	u64 sltime;
 998
 999	vcpu->stat.exit_wait_state++;
1000
1001	/* fast path */
1002	if (kvm_arch_vcpu_runnable(vcpu))
1003		return 0;
1004
1005	if (psw_interrupts_disabled(vcpu)) {
1006		VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
1007		return -EOPNOTSUPP; /* disabled wait */
1008	}
1009
1010	if (!ckc_interrupts_enabled(vcpu) &&
1011	    !cpu_timer_interrupts_enabled(vcpu)) {
1012		VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
1013		__set_cpu_idle(vcpu);
1014		goto no_timer;
1015	}
1016
1017	sltime = __calculate_sltime(vcpu);
1018	if (!sltime)
1019		return 0;
1020
1021	__set_cpu_idle(vcpu);
1022	hrtimer_start(&vcpu->arch.ckc_timer, sltime, HRTIMER_MODE_REL);
1023	VCPU_EVENT(vcpu, 4, "enabled wait: %llu ns", sltime);
1024no_timer:
1025	srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
1026	kvm_vcpu_block(vcpu);
1027	__unset_cpu_idle(vcpu);
1028	vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1029
1030	hrtimer_cancel(&vcpu->arch.ckc_timer);
1031	return 0;
1032}
1033
1034void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
1035{
1036	/*
1037	 * We cannot move this into the if, as the CPU might be already
1038	 * in kvm_vcpu_block without having the waitqueue set (polling)
1039	 */
1040	vcpu->valid_wakeup = true;
1041	if (swait_active(&vcpu->wq)) {
1042		/*
1043		 * The vcpu gave up the cpu voluntarily, mark it as a good
1044		 * yield-candidate.
1045		 */
1046		vcpu->preempted = true;
1047		swake_up(&vcpu->wq);
1048		vcpu->stat.halt_wakeup++;
1049	}
1050	/*
1051	 * The VCPU might not be sleeping but is executing the VSIE. Let's
1052	 * kick it, so it leaves the SIE to process the request.
1053	 */
1054	kvm_s390_vsie_kick(vcpu);
1055}
1056
1057enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
1058{
1059	struct kvm_vcpu *vcpu;
1060	u64 sltime;
1061
1062	vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
1063	sltime = __calculate_sltime(vcpu);
1064
1065	/*
1066	 * If the monotonic clock runs faster than the tod clock we might be
1067	 * woken up too early and have to go back to sleep to avoid deadlocks.
1068	 */
1069	if (sltime && hrtimer_forward_now(timer, ns_to_ktime(sltime)))
1070		return HRTIMER_RESTART;
1071	kvm_s390_vcpu_wakeup(vcpu);
1072	return HRTIMER_NORESTART;
1073}
1074
1075void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
1076{
1077	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1078
1079	spin_lock(&li->lock);
1080	li->pending_irqs = 0;
1081	bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
1082	memset(&li->irq, 0, sizeof(li->irq));
1083	spin_unlock(&li->lock);
1084
1085	sca_clear_ext_call(vcpu);
1086}
1087
1088int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
1089{
1090	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1091	deliver_irq_t func;
1092	int rc = 0;
1093	unsigned long irq_type;
1094	unsigned long irqs;
1095
1096	__reset_intercept_indicators(vcpu);
1097
1098	/* pending ckc conditions might have been invalidated */
1099	clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1100	if (ckc_irq_pending(vcpu))
1101		set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1102
1103	/* pending cpu timer conditions might have been invalidated */
1104	clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1105	if (cpu_timer_irq_pending(vcpu))
1106		set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1107
1108	while ((irqs = deliverable_irqs(vcpu)) && !rc) {
1109		/* bits are in the order of interrupt priority */
1110		irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT);
1111		if (is_ioirq(irq_type)) {
1112			rc = __deliver_io(vcpu, irq_type);
1113		} else {
1114			func = deliver_irq_funcs[irq_type];
1115			if (!func) {
1116				WARN_ON_ONCE(func == NULL);
1117				clear_bit(irq_type, &li->pending_irqs);
1118				continue;
1119			}
1120			rc = func(vcpu);
1121		}
1122	}
1123
1124	set_intercept_indicators(vcpu);
1125
1126	return rc;
1127}
1128
1129static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1130{
1131	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1132
1133	VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
1134	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
1135				   irq->u.pgm.code, 0);
1136
1137	if (!(irq->u.pgm.flags & KVM_S390_PGM_FLAGS_ILC_VALID)) {
1138		/* auto detection if no valid ILC was given */
1139		irq->u.pgm.flags &= ~KVM_S390_PGM_FLAGS_ILC_MASK;
1140		irq->u.pgm.flags |= kvm_s390_get_ilen(vcpu);
1141		irq->u.pgm.flags |= KVM_S390_PGM_FLAGS_ILC_VALID;
1142	}
1143
1144	if (irq->u.pgm.code == PGM_PER) {
1145		li->irq.pgm.code |= PGM_PER;
1146		li->irq.pgm.flags = irq->u.pgm.flags;
1147		/* only modify PER related information */
1148		li->irq.pgm.per_address = irq->u.pgm.per_address;
1149		li->irq.pgm.per_code = irq->u.pgm.per_code;
1150		li->irq.pgm.per_atmid = irq->u.pgm.per_atmid;
1151		li->irq.pgm.per_access_id = irq->u.pgm.per_access_id;
1152	} else if (!(irq->u.pgm.code & PGM_PER)) {
1153		li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
1154				   irq->u.pgm.code;
1155		li->irq.pgm.flags = irq->u.pgm.flags;
1156		/* only modify non-PER information */
1157		li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
1158		li->irq.pgm.mon_code = irq->u.pgm.mon_code;
1159		li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code;
1160		li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr;
1161		li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id;
1162		li->irq.pgm.op_access_id = irq->u.pgm.op_access_id;
1163	} else {
1164		li->irq.pgm = irq->u.pgm;
1165	}
1166	set_bit(IRQ_PEND_PROG, &li->pending_irqs);
1167	return 0;
1168}
1169
1170static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1171{
1172	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1173
1174	VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
1175		   irq->u.ext.ext_params2);
1176	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1177				   irq->u.ext.ext_params,
1178				   irq->u.ext.ext_params2);
1179
1180	li->irq.ext = irq->u.ext;
1181	set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1182	atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1183	return 0;
1184}
1185
1186static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1187{
1188	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1189	struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1190	uint16_t src_id = irq->u.extcall.code;
1191
1192	VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1193		   src_id);
1194	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1195				   src_id, 0);
1196
1197	/* sending vcpu invalid */
1198	if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
1199		return -EINVAL;
1200
1201	if (sclp.has_sigpif)
1202		return sca_inject_ext_call(vcpu, src_id);
1203
1204	if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1205		return -EBUSY;
1206	*extcall = irq->u.extcall;
1207	atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1208	return 0;
1209}
1210
1211static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1212{
1213	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1214	struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1215
1216	VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1217		   irq->u.prefix.address);
1218	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1219				   irq->u.prefix.address, 0);
1220
1221	if (!is_vcpu_stopped(vcpu))
1222		return -EBUSY;
1223
1224	*prefix = irq->u.prefix;
1225	set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1226	return 0;
1227}
1228
1229#define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
1230static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1231{
1232	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1233	struct kvm_s390_stop_info *stop = &li->irq.stop;
1234	int rc = 0;
1235
1236	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1237
1238	if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1239		return -EINVAL;
1240
1241	if (is_vcpu_stopped(vcpu)) {
1242		if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1243			rc = kvm_s390_store_status_unloaded(vcpu,
1244						KVM_S390_STORE_STATUS_NOADDR);
1245		return rc;
1246	}
1247
1248	if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1249		return -EBUSY;
1250	stop->flags = irq->u.stop.flags;
1251	__set_cpuflag(vcpu, CPUSTAT_STOP_INT);
1252	return 0;
1253}
1254
1255static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
1256				 struct kvm_s390_irq *irq)
1257{
1258	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1259
1260	VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1261	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1262
1263	set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1264	return 0;
1265}
1266
1267static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1268				   struct kvm_s390_irq *irq)
1269{
1270	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1271
1272	VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1273		   irq->u.emerg.code);
1274	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1275				   irq->u.emerg.code, 0);
1276
1277	/* sending vcpu invalid */
1278	if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
1279		return -EINVAL;
1280
1281	set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1282	set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1283	atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1284	return 0;
1285}
1286
1287static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1288{
1289	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1290	struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1291
1292	VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1293		   irq->u.mchk.mcic);
1294	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1295				   irq->u.mchk.mcic);
1296
1297	/*
1298	 * Because repressible machine checks can be indicated along with
1299	 * exigent machine checks (PoP, Chapter 11, Interruption action)
1300	 * we need to combine cr14, mcic and external damage code.
1301	 * Failing storage address and the logout area should not be or'ed
1302	 * together, we just indicate the last occurrence of the corresponding
1303	 * machine check
1304	 */
1305	mchk->cr14 |= irq->u.mchk.cr14;
1306	mchk->mcic |= irq->u.mchk.mcic;
1307	mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1308	mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1309	memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1310	       sizeof(mchk->fixed_logout));
1311	if (mchk->mcic & MCHK_EX_MASK)
1312		set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1313	else if (mchk->mcic & MCHK_REP_MASK)
1314		set_bit(IRQ_PEND_MCHK_REP,  &li->pending_irqs);
1315	return 0;
1316}
1317
1318static int __inject_ckc(struct kvm_vcpu *vcpu)
1319{
1320	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1321
1322	VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1323	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1324				   0, 0);
1325
1326	set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1327	atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1328	return 0;
1329}
1330
1331static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1332{
1333	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1334
1335	VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1336	trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1337				   0, 0);
1338
1339	set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1340	atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1341	return 0;
1342}
1343
1344static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1345						  int isc, u32 schid)
1346{
1347	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1348	struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1349	struct kvm_s390_interrupt_info *iter;
1350	u16 id = (schid & 0xffff0000U) >> 16;
1351	u16 nr = schid & 0x0000ffffU;
1352
1353	spin_lock(&fi->lock);
1354	list_for_each_entry(iter, isc_list, list) {
1355		if (schid && (id != iter->io.subchannel_id ||
1356			      nr != iter->io.subchannel_nr))
1357			continue;
1358		/* found an appropriate entry */
1359		list_del_init(&iter->list);
1360		fi->counters[FIRQ_CNTR_IO] -= 1;
1361		if (list_empty(isc_list))
1362			clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1363		spin_unlock(&fi->lock);
1364		return iter;
1365	}
1366	spin_unlock(&fi->lock);
1367	return NULL;
1368}
1369
1370/*
1371 * Dequeue and return an I/O interrupt matching any of the interruption
1372 * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1373 */
1374struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1375						    u64 isc_mask, u32 schid)
1376{
1377	struct kvm_s390_interrupt_info *inti = NULL;
1378	int isc;
1379
1380	for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1381		if (isc_mask & isc_to_isc_bits(isc))
1382			inti = get_io_int(kvm, isc, schid);
1383	}
1384	return inti;
1385}
1386
1387#define SCCB_MASK 0xFFFFFFF8
1388#define SCCB_EVENT_PENDING 0x3
1389
1390static int __inject_service(struct kvm *kvm,
1391			     struct kvm_s390_interrupt_info *inti)
1392{
1393	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1394
1395	spin_lock(&fi->lock);
1396	fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1397	/*
1398	 * Early versions of the QEMU s390 bios will inject several
1399	 * service interrupts after another without handling a
1400	 * condition code indicating busy.
1401	 * We will silently ignore those superfluous sccb values.
1402	 * A future version of QEMU will take care of serialization
1403	 * of servc requests
1404	 */
1405	if (fi->srv_signal.ext_params & SCCB_MASK)
1406		goto out;
1407	fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1408	set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1409out:
1410	spin_unlock(&fi->lock);
1411	kfree(inti);
1412	return 0;
1413}
1414
1415static int __inject_virtio(struct kvm *kvm,
1416			    struct kvm_s390_interrupt_info *inti)
1417{
1418	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1419
1420	spin_lock(&fi->lock);
1421	if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1422		spin_unlock(&fi->lock);
1423		return -EBUSY;
1424	}
1425	fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1426	list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1427	set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1428	spin_unlock(&fi->lock);
1429	return 0;
1430}
1431
1432static int __inject_pfault_done(struct kvm *kvm,
1433				 struct kvm_s390_interrupt_info *inti)
1434{
1435	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1436
1437	spin_lock(&fi->lock);
1438	if (fi->counters[FIRQ_CNTR_PFAULT] >=
1439		(ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1440		spin_unlock(&fi->lock);
1441		return -EBUSY;
1442	}
1443	fi->counters[FIRQ_CNTR_PFAULT] += 1;
1444	list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1445	set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1446	spin_unlock(&fi->lock);
1447	return 0;
1448}
1449
1450#define CR_PENDING_SUBCLASS 28
1451static int __inject_float_mchk(struct kvm *kvm,
1452				struct kvm_s390_interrupt_info *inti)
1453{
1454	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1455
1456	spin_lock(&fi->lock);
1457	fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1458	fi->mchk.mcic |= inti->mchk.mcic;
1459	set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1460	spin_unlock(&fi->lock);
1461	kfree(inti);
1462	return 0;
1463}
1464
1465static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1466{
1467	struct kvm_s390_float_interrupt *fi;
1468	struct list_head *list;
1469	int isc;
1470
1471	fi = &kvm->arch.float_int;
1472	spin_lock(&fi->lock);
1473	if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1474		spin_unlock(&fi->lock);
1475		return -EBUSY;
1476	}
1477	fi->counters[FIRQ_CNTR_IO] += 1;
1478
1479	if (inti->type & KVM_S390_INT_IO_AI_MASK)
1480		VM_EVENT(kvm, 4, "%s", "inject: I/O (AI)");
1481	else
1482		VM_EVENT(kvm, 4, "inject: I/O %x ss %x schid %04x",
1483			inti->io.subchannel_id >> 8,
1484			inti->io.subchannel_id >> 1 & 0x3,
1485			inti->io.subchannel_nr);
1486	isc = int_word_to_isc(inti->io.io_int_word);
1487	list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1488	list_add_tail(&inti->list, list);
1489	set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1490	spin_unlock(&fi->lock);
1491	return 0;
1492}
1493
1494/*
1495 * Find a destination VCPU for a floating irq and kick it.
1496 */
1497static void __floating_irq_kick(struct kvm *kvm, u64 type)
1498{
1499	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1500	struct kvm_s390_local_interrupt *li;
1501	struct kvm_vcpu *dst_vcpu;
1502	int sigcpu, online_vcpus, nr_tries = 0;
1503
1504	online_vcpus = atomic_read(&kvm->online_vcpus);
1505	if (!online_vcpus)
1506		return;
1507
1508	/* find idle VCPUs first, then round robin */
1509	sigcpu = find_first_bit(fi->idle_mask, online_vcpus);
1510	if (sigcpu == online_vcpus) {
1511		do {
1512			sigcpu = fi->next_rr_cpu;
1513			fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus;
1514			/* avoid endless loops if all vcpus are stopped */
1515			if (nr_tries++ >= online_vcpus)
1516				return;
1517		} while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1518	}
1519	dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1520
1521	/* make the VCPU drop out of the SIE, or wake it up if sleeping */
1522	li = &dst_vcpu->arch.local_int;
1523	spin_lock(&li->lock);
1524	switch (type) {
1525	case KVM_S390_MCHK:
1526		atomic_or(CPUSTAT_STOP_INT, li->cpuflags);
1527		break;
1528	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1529		atomic_or(CPUSTAT_IO_INT, li->cpuflags);
1530		break;
1531	default:
1532		atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
1533		break;
1534	}
1535	spin_unlock(&li->lock);
1536	kvm_s390_vcpu_wakeup(dst_vcpu);
1537}
1538
1539static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1540{
1541	u64 type = READ_ONCE(inti->type);
1542	int rc;
1543
1544	switch (type) {
1545	case KVM_S390_MCHK:
1546		rc = __inject_float_mchk(kvm, inti);
1547		break;
1548	case KVM_S390_INT_VIRTIO:
1549		rc = __inject_virtio(kvm, inti);
1550		break;
1551	case KVM_S390_INT_SERVICE:
1552		rc = __inject_service(kvm, inti);
1553		break;
1554	case KVM_S390_INT_PFAULT_DONE:
1555		rc = __inject_pfault_done(kvm, inti);
1556		break;
1557	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1558		rc = __inject_io(kvm, inti);
1559		break;
1560	default:
1561		rc = -EINVAL;
1562	}
1563	if (rc)
1564		return rc;
1565
1566	__floating_irq_kick(kvm, type);
1567	return 0;
1568}
1569
1570int kvm_s390_inject_vm(struct kvm *kvm,
1571		       struct kvm_s390_interrupt *s390int)
1572{
1573	struct kvm_s390_interrupt_info *inti;
1574	int rc;
1575
1576	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1577	if (!inti)
1578		return -ENOMEM;
1579
1580	inti->type = s390int->type;
1581	switch (inti->type) {
1582	case KVM_S390_INT_VIRTIO:
1583		VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
1584			 s390int->parm, s390int->parm64);
1585		inti->ext.ext_params = s390int->parm;
1586		inti->ext.ext_params2 = s390int->parm64;
1587		break;
1588	case KVM_S390_INT_SERVICE:
1589		VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
1590		inti->ext.ext_params = s390int->parm;
1591		break;
1592	case KVM_S390_INT_PFAULT_DONE:
1593		inti->ext.ext_params2 = s390int->parm64;
1594		break;
1595	case KVM_S390_MCHK:
1596		VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
1597			 s390int->parm64);
1598		inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1599		inti->mchk.mcic = s390int->parm64;
1600		break;
1601	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
 
 
 
 
 
 
 
1602		inti->io.subchannel_id = s390int->parm >> 16;
1603		inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1604		inti->io.io_int_parm = s390int->parm64 >> 32;
1605		inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1606		break;
1607	default:
1608		kfree(inti);
1609		return -EINVAL;
1610	}
1611	trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1612				 2);
1613
1614	rc = __inject_vm(kvm, inti);
1615	if (rc)
1616		kfree(inti);
1617	return rc;
1618}
1619
1620int kvm_s390_reinject_io_int(struct kvm *kvm,
1621			      struct kvm_s390_interrupt_info *inti)
1622{
1623	return __inject_vm(kvm, inti);
1624}
1625
1626int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1627		       struct kvm_s390_irq *irq)
1628{
1629	irq->type = s390int->type;
1630	switch (irq->type) {
1631	case KVM_S390_PROGRAM_INT:
1632		if (s390int->parm & 0xffff0000)
1633			return -EINVAL;
1634		irq->u.pgm.code = s390int->parm;
1635		break;
1636	case KVM_S390_SIGP_SET_PREFIX:
1637		irq->u.prefix.address = s390int->parm;
1638		break;
1639	case KVM_S390_SIGP_STOP:
1640		irq->u.stop.flags = s390int->parm;
1641		break;
1642	case KVM_S390_INT_EXTERNAL_CALL:
1643		if (s390int->parm & 0xffff0000)
1644			return -EINVAL;
1645		irq->u.extcall.code = s390int->parm;
1646		break;
1647	case KVM_S390_INT_EMERGENCY:
1648		if (s390int->parm & 0xffff0000)
1649			return -EINVAL;
1650		irq->u.emerg.code = s390int->parm;
1651		break;
1652	case KVM_S390_MCHK:
1653		irq->u.mchk.mcic = s390int->parm64;
1654		break;
1655	}
1656	return 0;
1657}
1658
1659int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1660{
1661	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1662
1663	return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1664}
1665
1666void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1667{
1668	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1669
1670	spin_lock(&li->lock);
1671	li->irq.stop.flags = 0;
1672	clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1673	spin_unlock(&li->lock);
1674}
1675
1676static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1677{
1678	int rc;
1679
1680	switch (irq->type) {
1681	case KVM_S390_PROGRAM_INT:
1682		rc = __inject_prog(vcpu, irq);
1683		break;
1684	case KVM_S390_SIGP_SET_PREFIX:
1685		rc = __inject_set_prefix(vcpu, irq);
1686		break;
1687	case KVM_S390_SIGP_STOP:
1688		rc = __inject_sigp_stop(vcpu, irq);
1689		break;
1690	case KVM_S390_RESTART:
1691		rc = __inject_sigp_restart(vcpu, irq);
1692		break;
1693	case KVM_S390_INT_CLOCK_COMP:
1694		rc = __inject_ckc(vcpu);
1695		break;
1696	case KVM_S390_INT_CPU_TIMER:
1697		rc = __inject_cpu_timer(vcpu);
1698		break;
1699	case KVM_S390_INT_EXTERNAL_CALL:
1700		rc = __inject_extcall(vcpu, irq);
1701		break;
1702	case KVM_S390_INT_EMERGENCY:
1703		rc = __inject_sigp_emergency(vcpu, irq);
1704		break;
1705	case KVM_S390_MCHK:
1706		rc = __inject_mchk(vcpu, irq);
1707		break;
1708	case KVM_S390_INT_PFAULT_INIT:
1709		rc = __inject_pfault_init(vcpu, irq);
1710		break;
1711	case KVM_S390_INT_VIRTIO:
1712	case KVM_S390_INT_SERVICE:
1713	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1714	default:
1715		rc = -EINVAL;
1716	}
1717
1718	return rc;
1719}
1720
1721int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1722{
1723	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1724	int rc;
1725
1726	spin_lock(&li->lock);
1727	rc = do_inject_vcpu(vcpu, irq);
1728	spin_unlock(&li->lock);
1729	if (!rc)
1730		kvm_s390_vcpu_wakeup(vcpu);
1731	return rc;
1732}
1733
1734static inline void clear_irq_list(struct list_head *_list)
1735{
1736	struct kvm_s390_interrupt_info *inti, *n;
1737
1738	list_for_each_entry_safe(inti, n, _list, list) {
1739		list_del(&inti->list);
1740		kfree(inti);
1741	}
1742}
1743
1744static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
1745		       struct kvm_s390_irq *irq)
1746{
1747	irq->type = inti->type;
1748	switch (inti->type) {
1749	case KVM_S390_INT_PFAULT_INIT:
1750	case KVM_S390_INT_PFAULT_DONE:
1751	case KVM_S390_INT_VIRTIO:
1752		irq->u.ext = inti->ext;
1753		break;
1754	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1755		irq->u.io = inti->io;
1756		break;
1757	}
1758}
1759
1760void kvm_s390_clear_float_irqs(struct kvm *kvm)
1761{
1762	struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1763	int i;
1764
1765	spin_lock(&fi->lock);
1766	fi->pending_irqs = 0;
1767	memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
1768	memset(&fi->mchk, 0, sizeof(fi->mchk));
1769	for (i = 0; i < FIRQ_LIST_COUNT; i++)
1770		clear_irq_list(&fi->lists[i]);
1771	for (i = 0; i < FIRQ_MAX_COUNT; i++)
1772		fi->counters[i] = 0;
1773	spin_unlock(&fi->lock);
1774};
1775
1776static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
1777{
1778	struct kvm_s390_interrupt_info *inti;
1779	struct kvm_s390_float_interrupt *fi;
1780	struct kvm_s390_irq *buf;
1781	struct kvm_s390_irq *irq;
1782	int max_irqs;
1783	int ret = 0;
1784	int n = 0;
1785	int i;
1786
1787	if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
1788		return -EINVAL;
1789
1790	/*
1791	 * We are already using -ENOMEM to signal
1792	 * userspace it may retry with a bigger buffer,
1793	 * so we need to use something else for this case
1794	 */
1795	buf = vzalloc(len);
1796	if (!buf)
1797		return -ENOBUFS;
1798
1799	max_irqs = len / sizeof(struct kvm_s390_irq);
1800
1801	fi = &kvm->arch.float_int;
1802	spin_lock(&fi->lock);
1803	for (i = 0; i < FIRQ_LIST_COUNT; i++) {
1804		list_for_each_entry(inti, &fi->lists[i], list) {
1805			if (n == max_irqs) {
1806				/* signal userspace to try again */
1807				ret = -ENOMEM;
1808				goto out;
1809			}
1810			inti_to_irq(inti, &buf[n]);
1811			n++;
1812		}
1813	}
1814	if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
1815		if (n == max_irqs) {
1816			/* signal userspace to try again */
1817			ret = -ENOMEM;
1818			goto out;
1819		}
1820		irq = (struct kvm_s390_irq *) &buf[n];
1821		irq->type = KVM_S390_INT_SERVICE;
1822		irq->u.ext = fi->srv_signal;
1823		n++;
1824	}
1825	if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
1826		if (n == max_irqs) {
1827				/* signal userspace to try again */
1828				ret = -ENOMEM;
1829				goto out;
1830		}
1831		irq = (struct kvm_s390_irq *) &buf[n];
1832		irq->type = KVM_S390_MCHK;
1833		irq->u.mchk = fi->mchk;
1834		n++;
1835}
1836
1837out:
1838	spin_unlock(&fi->lock);
1839	if (!ret && n > 0) {
1840		if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
1841			ret = -EFAULT;
1842	}
1843	vfree(buf);
1844
1845	return ret < 0 ? ret : n;
1846}
1847
1848static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1849{
1850	int r;
1851
1852	switch (attr->group) {
1853	case KVM_DEV_FLIC_GET_ALL_IRQS:
1854		r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
1855					  attr->attr);
1856		break;
1857	default:
1858		r = -EINVAL;
1859	}
1860
1861	return r;
1862}
1863
1864static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1865				     u64 addr)
1866{
1867	struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1868	void *target = NULL;
1869	void __user *source;
1870	u64 size;
1871
1872	if (get_user(inti->type, (u64 __user *)addr))
1873		return -EFAULT;
1874
1875	switch (inti->type) {
1876	case KVM_S390_INT_PFAULT_INIT:
1877	case KVM_S390_INT_PFAULT_DONE:
1878	case KVM_S390_INT_VIRTIO:
1879	case KVM_S390_INT_SERVICE:
1880		target = (void *) &inti->ext;
1881		source = &uptr->u.ext;
1882		size = sizeof(inti->ext);
1883		break;
1884	case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1885		target = (void *) &inti->io;
1886		source = &uptr->u.io;
1887		size = sizeof(inti->io);
1888		break;
1889	case KVM_S390_MCHK:
1890		target = (void *) &inti->mchk;
1891		source = &uptr->u.mchk;
1892		size = sizeof(inti->mchk);
1893		break;
1894	default:
1895		return -EINVAL;
1896	}
1897
1898	if (copy_from_user(target, source, size))
1899		return -EFAULT;
1900
1901	return 0;
1902}
1903
1904static int enqueue_floating_irq(struct kvm_device *dev,
1905				struct kvm_device_attr *attr)
1906{
1907	struct kvm_s390_interrupt_info *inti = NULL;
1908	int r = 0;
1909	int len = attr->attr;
1910
1911	if (len % sizeof(struct kvm_s390_irq) != 0)
1912		return -EINVAL;
1913	else if (len > KVM_S390_FLIC_MAX_BUFFER)
1914		return -EINVAL;
1915
1916	while (len >= sizeof(struct kvm_s390_irq)) {
1917		inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1918		if (!inti)
1919			return -ENOMEM;
1920
1921		r = copy_irq_from_user(inti, attr->addr);
1922		if (r) {
1923			kfree(inti);
1924			return r;
1925		}
1926		r = __inject_vm(dev->kvm, inti);
1927		if (r) {
1928			kfree(inti);
1929			return r;
1930		}
1931		len -= sizeof(struct kvm_s390_irq);
1932		attr->addr += sizeof(struct kvm_s390_irq);
1933	}
1934
1935	return r;
1936}
1937
1938static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1939{
1940	if (id >= MAX_S390_IO_ADAPTERS)
1941		return NULL;
1942	return kvm->arch.adapters[id];
1943}
1944
1945static int register_io_adapter(struct kvm_device *dev,
1946			       struct kvm_device_attr *attr)
1947{
1948	struct s390_io_adapter *adapter;
1949	struct kvm_s390_io_adapter adapter_info;
1950
1951	if (copy_from_user(&adapter_info,
1952			   (void __user *)attr->addr, sizeof(adapter_info)))
1953		return -EFAULT;
1954
1955	if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1956	    (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1957		return -EINVAL;
1958
1959	adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1960	if (!adapter)
1961		return -ENOMEM;
1962
1963	INIT_LIST_HEAD(&adapter->maps);
1964	init_rwsem(&adapter->maps_lock);
1965	atomic_set(&adapter->nr_maps, 0);
1966	adapter->id = adapter_info.id;
1967	adapter->isc = adapter_info.isc;
1968	adapter->maskable = adapter_info.maskable;
1969	adapter->masked = false;
1970	adapter->swap = adapter_info.swap;
1971	dev->kvm->arch.adapters[adapter->id] = adapter;
1972
1973	return 0;
1974}
1975
1976int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1977{
1978	int ret;
1979	struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1980
1981	if (!adapter || !adapter->maskable)
1982		return -EINVAL;
1983	ret = adapter->masked;
1984	adapter->masked = masked;
1985	return ret;
1986}
1987
1988static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1989{
1990	struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1991	struct s390_map_info *map;
1992	int ret;
1993
1994	if (!adapter || !addr)
1995		return -EINVAL;
1996
1997	map = kzalloc(sizeof(*map), GFP_KERNEL);
1998	if (!map) {
1999		ret = -ENOMEM;
2000		goto out;
2001	}
2002	INIT_LIST_HEAD(&map->list);
2003	map->guest_addr = addr;
2004	map->addr = gmap_translate(kvm->arch.gmap, addr);
2005	if (map->addr == -EFAULT) {
2006		ret = -EFAULT;
2007		goto out;
2008	}
2009	ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
2010	if (ret < 0)
2011		goto out;
2012	BUG_ON(ret != 1);
2013	down_write(&adapter->maps_lock);
2014	if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
2015		list_add_tail(&map->list, &adapter->maps);
2016		ret = 0;
2017	} else {
2018		put_page(map->page);
2019		ret = -EINVAL;
2020	}
2021	up_write(&adapter->maps_lock);
2022out:
2023	if (ret)
2024		kfree(map);
2025	return ret;
2026}
2027
2028static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
2029{
2030	struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2031	struct s390_map_info *map, *tmp;
2032	int found = 0;
2033
2034	if (!adapter || !addr)
2035		return -EINVAL;
2036
2037	down_write(&adapter->maps_lock);
2038	list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
2039		if (map->guest_addr == addr) {
2040			found = 1;
2041			atomic_dec(&adapter->nr_maps);
2042			list_del(&map->list);
2043			put_page(map->page);
2044			kfree(map);
2045			break;
2046		}
2047	}
2048	up_write(&adapter->maps_lock);
2049
2050	return found ? 0 : -EINVAL;
2051}
2052
2053void kvm_s390_destroy_adapters(struct kvm *kvm)
2054{
2055	int i;
2056	struct s390_map_info *map, *tmp;
2057
2058	for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
2059		if (!kvm->arch.adapters[i])
2060			continue;
2061		list_for_each_entry_safe(map, tmp,
2062					 &kvm->arch.adapters[i]->maps, list) {
2063			list_del(&map->list);
2064			put_page(map->page);
2065			kfree(map);
2066		}
2067		kfree(kvm->arch.adapters[i]);
2068	}
2069}
2070
2071static int modify_io_adapter(struct kvm_device *dev,
2072			     struct kvm_device_attr *attr)
2073{
2074	struct kvm_s390_io_adapter_req req;
2075	struct s390_io_adapter *adapter;
2076	int ret;
2077
2078	if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2079		return -EFAULT;
2080
2081	adapter = get_io_adapter(dev->kvm, req.id);
2082	if (!adapter)
2083		return -EINVAL;
2084	switch (req.type) {
2085	case KVM_S390_IO_ADAPTER_MASK:
2086		ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
2087		if (ret > 0)
2088			ret = 0;
2089		break;
2090	case KVM_S390_IO_ADAPTER_MAP:
2091		ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
2092		break;
2093	case KVM_S390_IO_ADAPTER_UNMAP:
2094		ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
2095		break;
2096	default:
2097		ret = -EINVAL;
2098	}
2099
2100	return ret;
2101}
2102
2103static int clear_io_irq(struct kvm *kvm, struct kvm_device_attr *attr)
2104
2105{
2106	const u64 isc_mask = 0xffUL << 24; /* all iscs set */
2107	u32 schid;
2108
2109	if (attr->flags)
2110		return -EINVAL;
2111	if (attr->attr != sizeof(schid))
2112		return -EINVAL;
2113	if (copy_from_user(&schid, (void __user *) attr->addr, sizeof(schid)))
2114		return -EFAULT;
2115	kfree(kvm_s390_get_io_int(kvm, isc_mask, schid));
2116	/*
2117	 * If userspace is conforming to the architecture, we can have at most
2118	 * one pending I/O interrupt per subchannel, so this is effectively a
2119	 * clear all.
2120	 */
2121	return 0;
2122}
2123
2124static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2125{
2126	int r = 0;
2127	unsigned int i;
2128	struct kvm_vcpu *vcpu;
2129
2130	switch (attr->group) {
2131	case KVM_DEV_FLIC_ENQUEUE:
2132		r = enqueue_floating_irq(dev, attr);
2133		break;
2134	case KVM_DEV_FLIC_CLEAR_IRQS:
2135		kvm_s390_clear_float_irqs(dev->kvm);
2136		break;
2137	case KVM_DEV_FLIC_APF_ENABLE:
2138		dev->kvm->arch.gmap->pfault_enabled = 1;
2139		break;
2140	case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2141		dev->kvm->arch.gmap->pfault_enabled = 0;
2142		/*
2143		 * Make sure no async faults are in transition when
2144		 * clearing the queues. So we don't need to worry
2145		 * about late coming workers.
2146		 */
2147		synchronize_srcu(&dev->kvm->srcu);
2148		kvm_for_each_vcpu(i, vcpu, dev->kvm)
2149			kvm_clear_async_pf_completion_queue(vcpu);
2150		break;
2151	case KVM_DEV_FLIC_ADAPTER_REGISTER:
2152		r = register_io_adapter(dev, attr);
2153		break;
2154	case KVM_DEV_FLIC_ADAPTER_MODIFY:
2155		r = modify_io_adapter(dev, attr);
2156		break;
2157	case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2158		r = clear_io_irq(dev->kvm, attr);
2159		break;
2160	default:
2161		r = -EINVAL;
2162	}
2163
2164	return r;
2165}
2166
2167static int flic_has_attr(struct kvm_device *dev,
2168			     struct kvm_device_attr *attr)
2169{
2170	switch (attr->group) {
2171	case KVM_DEV_FLIC_GET_ALL_IRQS:
2172	case KVM_DEV_FLIC_ENQUEUE:
2173	case KVM_DEV_FLIC_CLEAR_IRQS:
2174	case KVM_DEV_FLIC_APF_ENABLE:
2175	case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2176	case KVM_DEV_FLIC_ADAPTER_REGISTER:
2177	case KVM_DEV_FLIC_ADAPTER_MODIFY:
2178	case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2179		return 0;
2180	}
2181	return -ENXIO;
2182}
2183
2184static int flic_create(struct kvm_device *dev, u32 type)
2185{
2186	if (!dev)
2187		return -EINVAL;
2188	if (dev->kvm->arch.flic)
2189		return -EINVAL;
2190	dev->kvm->arch.flic = dev;
2191	return 0;
2192}
2193
2194static void flic_destroy(struct kvm_device *dev)
2195{
2196	dev->kvm->arch.flic = NULL;
2197	kfree(dev);
2198}
2199
2200/* s390 floating irq controller (flic) */
2201struct kvm_device_ops kvm_flic_ops = {
2202	.name = "kvm-flic",
2203	.get_attr = flic_get_attr,
2204	.set_attr = flic_set_attr,
2205	.has_attr = flic_has_attr,
2206	.create = flic_create,
2207	.destroy = flic_destroy,
2208};
2209
2210static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2211{
2212	unsigned long bit;
2213
2214	bit = bit_nr + (addr % PAGE_SIZE) * 8;
2215
2216	return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2217}
2218
2219static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2220					  u64 addr)
2221{
2222	struct s390_map_info *map;
2223
2224	if (!adapter)
2225		return NULL;
2226
2227	list_for_each_entry(map, &adapter->maps, list) {
2228		if (map->guest_addr == addr)
2229			return map;
2230	}
2231	return NULL;
2232}
2233
2234static int adapter_indicators_set(struct kvm *kvm,
2235				  struct s390_io_adapter *adapter,
2236				  struct kvm_s390_adapter_int *adapter_int)
2237{
2238	unsigned long bit;
2239	int summary_set, idx;
2240	struct s390_map_info *info;
2241	void *map;
2242
2243	info = get_map_info(adapter, adapter_int->ind_addr);
2244	if (!info)
2245		return -1;
2246	map = page_address(info->page);
2247	bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2248	set_bit(bit, map);
2249	idx = srcu_read_lock(&kvm->srcu);
2250	mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2251	set_page_dirty_lock(info->page);
2252	info = get_map_info(adapter, adapter_int->summary_addr);
2253	if (!info) {
2254		srcu_read_unlock(&kvm->srcu, idx);
2255		return -1;
2256	}
2257	map = page_address(info->page);
2258	bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2259			  adapter->swap);
2260	summary_set = test_and_set_bit(bit, map);
2261	mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2262	set_page_dirty_lock(info->page);
2263	srcu_read_unlock(&kvm->srcu, idx);
2264	return summary_set ? 0 : 1;
2265}
2266
2267/*
2268 * < 0 - not injected due to error
2269 * = 0 - coalesced, summary indicator already active
2270 * > 0 - injected interrupt
2271 */
2272static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2273			   struct kvm *kvm, int irq_source_id, int level,
2274			   bool line_status)
2275{
2276	int ret;
2277	struct s390_io_adapter *adapter;
2278
2279	/* We're only interested in the 0->1 transition. */
2280	if (!level)
2281		return 0;
2282	adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2283	if (!adapter)
2284		return -1;
2285	down_read(&adapter->maps_lock);
2286	ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2287	up_read(&adapter->maps_lock);
2288	if ((ret > 0) && !adapter->masked) {
2289		struct kvm_s390_interrupt s390int = {
2290			.type = KVM_S390_INT_IO(1, 0, 0, 0),
2291			.parm = 0,
2292			.parm64 = (adapter->isc << 27) | 0x80000000,
2293		};
2294		ret = kvm_s390_inject_vm(kvm, &s390int);
2295		if (ret == 0)
2296			ret = 1;
2297	}
2298	return ret;
2299}
2300
2301int kvm_set_routing_entry(struct kvm *kvm,
2302			  struct kvm_kernel_irq_routing_entry *e,
2303			  const struct kvm_irq_routing_entry *ue)
2304{
2305	int ret;
2306
2307	switch (ue->type) {
2308	case KVM_IRQ_ROUTING_S390_ADAPTER:
2309		e->set = set_adapter_int;
2310		e->adapter.summary_addr = ue->u.adapter.summary_addr;
2311		e->adapter.ind_addr = ue->u.adapter.ind_addr;
2312		e->adapter.summary_offset = ue->u.adapter.summary_offset;
2313		e->adapter.ind_offset = ue->u.adapter.ind_offset;
2314		e->adapter.adapter_id = ue->u.adapter.adapter_id;
2315		ret = 0;
2316		break;
2317	default:
2318		ret = -EINVAL;
2319	}
2320
2321	return ret;
2322}
2323
2324int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2325		int irq_source_id, int level, bool line_status)
2326{
2327	return -EINVAL;
2328}
2329
2330int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2331{
2332	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2333	struct kvm_s390_irq *buf;
2334	int r = 0;
2335	int n;
2336
2337	buf = vmalloc(len);
2338	if (!buf)
2339		return -ENOMEM;
2340
2341	if (copy_from_user((void *) buf, irqstate, len)) {
2342		r = -EFAULT;
2343		goto out_free;
2344	}
2345
2346	/*
2347	 * Don't allow setting the interrupt state
2348	 * when there are already interrupts pending
2349	 */
2350	spin_lock(&li->lock);
2351	if (li->pending_irqs) {
2352		r = -EBUSY;
2353		goto out_unlock;
2354	}
2355
2356	for (n = 0; n < len / sizeof(*buf); n++) {
2357		r = do_inject_vcpu(vcpu, &buf[n]);
2358		if (r)
2359			break;
2360	}
2361
2362out_unlock:
2363	spin_unlock(&li->lock);
2364out_free:
2365	vfree(buf);
2366
2367	return r;
2368}
2369
2370static void store_local_irq(struct kvm_s390_local_interrupt *li,
2371			    struct kvm_s390_irq *irq,
2372			    unsigned long irq_type)
2373{
2374	switch (irq_type) {
2375	case IRQ_PEND_MCHK_EX:
2376	case IRQ_PEND_MCHK_REP:
2377		irq->type = KVM_S390_MCHK;
2378		irq->u.mchk = li->irq.mchk;
2379		break;
2380	case IRQ_PEND_PROG:
2381		irq->type = KVM_S390_PROGRAM_INT;
2382		irq->u.pgm = li->irq.pgm;
2383		break;
2384	case IRQ_PEND_PFAULT_INIT:
2385		irq->type = KVM_S390_INT_PFAULT_INIT;
2386		irq->u.ext = li->irq.ext;
2387		break;
2388	case IRQ_PEND_EXT_EXTERNAL:
2389		irq->type = KVM_S390_INT_EXTERNAL_CALL;
2390		irq->u.extcall = li->irq.extcall;
2391		break;
2392	case IRQ_PEND_EXT_CLOCK_COMP:
2393		irq->type = KVM_S390_INT_CLOCK_COMP;
2394		break;
2395	case IRQ_PEND_EXT_CPU_TIMER:
2396		irq->type = KVM_S390_INT_CPU_TIMER;
2397		break;
2398	case IRQ_PEND_SIGP_STOP:
2399		irq->type = KVM_S390_SIGP_STOP;
2400		irq->u.stop = li->irq.stop;
2401		break;
2402	case IRQ_PEND_RESTART:
2403		irq->type = KVM_S390_RESTART;
2404		break;
2405	case IRQ_PEND_SET_PREFIX:
2406		irq->type = KVM_S390_SIGP_SET_PREFIX;
2407		irq->u.prefix = li->irq.prefix;
2408		break;
2409	}
2410}
2411
2412int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2413{
2414	int scn;
2415	unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2416	struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2417	unsigned long pending_irqs;
2418	struct kvm_s390_irq irq;
2419	unsigned long irq_type;
2420	int cpuaddr;
2421	int n = 0;
2422
2423	spin_lock(&li->lock);
2424	pending_irqs = li->pending_irqs;
2425	memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2426	       sizeof(sigp_emerg_pending));
2427	spin_unlock(&li->lock);
2428
2429	for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2430		memset(&irq, 0, sizeof(irq));
2431		if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2432			continue;
2433		if (n + sizeof(irq) > len)
2434			return -ENOBUFS;
2435		store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2436		if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2437			return -EFAULT;
2438		n += sizeof(irq);
2439	}
2440
2441	if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2442		for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2443			memset(&irq, 0, sizeof(irq));
2444			if (n + sizeof(irq) > len)
2445				return -ENOBUFS;
2446			irq.type = KVM_S390_INT_EMERGENCY;
2447			irq.u.emerg.code = cpuaddr;
2448			if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2449				return -EFAULT;
2450			n += sizeof(irq);
2451		}
2452	}
2453
2454	if (sca_ext_call_pending(vcpu, &scn)) {
2455		if (n + sizeof(irq) > len)
2456			return -ENOBUFS;
2457		memset(&irq, 0, sizeof(irq));
2458		irq.type = KVM_S390_INT_EXTERNAL_CALL;
2459		irq.u.extcall.code = scn;
2460		if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2461			return -EFAULT;
2462		n += sizeof(irq);
2463	}
2464
2465	return n;
2466}