kvm-s390.c 25.4 KB
Newer Older
1
/*
2
 * hosting zSeries kernel virtual machines
3
 *
4
 * Copyright IBM Corp. 2008, 2009
5 6 7 8 9 10 11 12
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License (version 2 only)
 * as published by the Free Software Foundation.
 *
 *    Author(s): Carsten Otte <cotte@de.ibm.com>
 *               Christian Borntraeger <borntraeger@de.ibm.com>
 *               Heiko Carstens <heiko.carstens@de.ibm.com>
13
 *               Christian Ehrhardt <ehrhardt@de.ibm.com>
14 15 16 17 18
 */

#include <linux/compiler.h>
#include <linux/err.h>
#include <linux/fs.h>
19
#include <linux/hrtimer.h>
20 21 22 23 24
#include <linux/init.h>
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <linux/module.h>
#include <linux/slab.h>
25
#include <linux/timer.h>
26
#include <asm/asm-offsets.h>
27 28
#include <asm/lowcore.h>
#include <asm/pgtable.h>
29
#include <asm/nmi.h>
30
#include <asm/switch_to.h>
31
#include <asm/sclp.h>
32
#include "kvm-s390.h"
33 34
#include "gaccess.h"

35 36
#define CREATE_TRACE_POINTS
#include "trace.h"
37
#include "trace-s390.h"
38

39 40 41 42
#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU

struct kvm_stats_debugfs_item debugfs_entries[] = {
	{ "userspace_handled", VCPU_STAT(exit_userspace) },
43
	{ "exit_null", VCPU_STAT(exit_null) },
44 45 46 47
	{ "exit_validity", VCPU_STAT(exit_validity) },
	{ "exit_stop_request", VCPU_STAT(exit_stop_request) },
	{ "exit_external_request", VCPU_STAT(exit_external_request) },
	{ "exit_external_interrupt", VCPU_STAT(exit_external_interrupt) },
48 49 50
	{ "exit_instruction", VCPU_STAT(exit_instruction) },
	{ "exit_program_interruption", VCPU_STAT(exit_program_interruption) },
	{ "exit_instr_and_program_int", VCPU_STAT(exit_instr_and_program) },
51
	{ "instruction_lctlg", VCPU_STAT(instruction_lctlg) },
52 53
	{ "instruction_lctl", VCPU_STAT(instruction_lctl) },
	{ "deliver_emergency_signal", VCPU_STAT(deliver_emergency_signal) },
54
	{ "deliver_external_call", VCPU_STAT(deliver_external_call) },
55 56 57 58 59 60 61
	{ "deliver_service_signal", VCPU_STAT(deliver_service_signal) },
	{ "deliver_virtio_interrupt", VCPU_STAT(deliver_virtio_interrupt) },
	{ "deliver_stop_signal", VCPU_STAT(deliver_stop_signal) },
	{ "deliver_prefix_signal", VCPU_STAT(deliver_prefix_signal) },
	{ "deliver_restart_signal", VCPU_STAT(deliver_restart_signal) },
	{ "deliver_program_interruption", VCPU_STAT(deliver_program_int) },
	{ "exit_wait_state", VCPU_STAT(exit_wait_state) },
62 63 64 65 66 67 68 69 70
	{ "instruction_stidp", VCPU_STAT(instruction_stidp) },
	{ "instruction_spx", VCPU_STAT(instruction_spx) },
	{ "instruction_stpx", VCPU_STAT(instruction_stpx) },
	{ "instruction_stap", VCPU_STAT(instruction_stap) },
	{ "instruction_storage_key", VCPU_STAT(instruction_storage_key) },
	{ "instruction_stsch", VCPU_STAT(instruction_stsch) },
	{ "instruction_chsc", VCPU_STAT(instruction_chsc) },
	{ "instruction_stsi", VCPU_STAT(instruction_stsi) },
	{ "instruction_stfl", VCPU_STAT(instruction_stfl) },
71
	{ "instruction_tprot", VCPU_STAT(instruction_tprot) },
72
	{ "instruction_sigp_sense", VCPU_STAT(instruction_sigp_sense) },
73
	{ "instruction_sigp_sense_running", VCPU_STAT(instruction_sigp_sense_running) },
74
	{ "instruction_sigp_external_call", VCPU_STAT(instruction_sigp_external_call) },
75 76 77 78 79
	{ "instruction_sigp_emergency", VCPU_STAT(instruction_sigp_emergency) },
	{ "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) },
	{ "instruction_sigp_set_arch", VCPU_STAT(instruction_sigp_arch) },
	{ "instruction_sigp_set_prefix", VCPU_STAT(instruction_sigp_prefix) },
	{ "instruction_sigp_restart", VCPU_STAT(instruction_sigp_restart) },
80
	{ "diagnose_10", VCPU_STAT(diagnose_10) },
81
	{ "diagnose_44", VCPU_STAT(diagnose_44) },
82
	{ "diagnose_9c", VCPU_STAT(diagnose_9c) },
83 84 85
	{ NULL }
};

86
static unsigned long long *facilities;
87 88

/* Section: not file related */
89
int kvm_arch_hardware_enable(void *garbage)
90 91
{
	/* every s390 is virtualization enabled ;-) */
92
	return 0;
93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131
}

void kvm_arch_hardware_disable(void *garbage)
{
}

int kvm_arch_hardware_setup(void)
{
	return 0;
}

void kvm_arch_hardware_unsetup(void)
{
}

void kvm_arch_check_processor_compat(void *rtn)
{
}

int kvm_arch_init(void *opaque)
{
	return 0;
}

void kvm_arch_exit(void)
{
}

/* Section: device related */
long kvm_arch_dev_ioctl(struct file *filp,
			unsigned int ioctl, unsigned long arg)
{
	if (ioctl == KVM_S390_ENABLE_SIE)
		return s390_enable_sie();
	return -EINVAL;
}

int kvm_dev_ioctl_check_extension(long ext)
{
132 133
	int r;

134
	switch (ext) {
135
	case KVM_CAP_S390_PSW:
136
	case KVM_CAP_S390_GMAP:
137
	case KVM_CAP_SYNC_MMU:
138 139 140
#ifdef CONFIG_KVM_S390_UCONTROL
	case KVM_CAP_S390_UCONTROL:
#endif
141
	case KVM_CAP_SYNC_REGS:
142
	case KVM_CAP_ONE_REG:
143 144
		r = 1;
		break;
145 146 147 148
	case KVM_CAP_NR_VCPUS:
	case KVM_CAP_MAX_VCPUS:
		r = KVM_MAX_VCPUS;
		break;
149 150 151
	case KVM_CAP_S390_COW:
		r = sclp_get_fac85() & 0x2;
		break;
152
	default:
153
		r = 0;
154
	}
155
	return r;
156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175
}

/* Section: vm related */
/*
 * Get (and clear) the dirty memory log for a memory slot.
 */
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
			       struct kvm_dirty_log *log)
{
	return 0;
}

long kvm_arch_vm_ioctl(struct file *filp,
		       unsigned int ioctl, unsigned long arg)
{
	struct kvm *kvm = filp->private_data;
	void __user *argp = (void __user *)arg;
	int r;

	switch (ioctl) {
176 177 178 179 180 181 182 183 184
	case KVM_S390_INTERRUPT: {
		struct kvm_s390_interrupt s390int;

		r = -EFAULT;
		if (copy_from_user(&s390int, argp, sizeof(s390int)))
			break;
		r = kvm_s390_inject_vm(kvm, &s390int);
		break;
	}
185
	default:
186
		r = -ENOTTY;
187 188 189 190 191
	}

	return r;
}

192
int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
193 194 195 196
{
	int rc;
	char debug_name[16];

197 198 199 200 201 202 203 204 205 206 207
	rc = -EINVAL;
#ifdef CONFIG_KVM_S390_UCONTROL
	if (type & ~KVM_VM_S390_UCONTROL)
		goto out_err;
	if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN)))
		goto out_err;
#else
	if (type)
		goto out_err;
#endif

208 209
	rc = s390_enable_sie();
	if (rc)
210
		goto out_err;
211

212 213
	rc = -ENOMEM;

214 215
	kvm->arch.sca = (struct sca_block *) get_zeroed_page(GFP_KERNEL);
	if (!kvm->arch.sca)
216
		goto out_err;
217 218 219 220 221 222 223

	sprintf(debug_name, "kvm-%u", current->pid);

	kvm->arch.dbf = debug_register(debug_name, 8, 2, 8 * sizeof(long));
	if (!kvm->arch.dbf)
		goto out_nodbf;

224 225 226
	spin_lock_init(&kvm->arch.float_int.lock);
	INIT_LIST_HEAD(&kvm->arch.float_int.list);

227 228 229
	debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
	VM_EVENT(kvm, 3, "%s", "vm created");

230 231 232 233 234 235 236
	if (type & KVM_VM_S390_UCONTROL) {
		kvm->arch.gmap = NULL;
	} else {
		kvm->arch.gmap = gmap_alloc(current->mm);
		if (!kvm->arch.gmap)
			goto out_nogmap;
	}
237
	return 0;
238 239
out_nogmap:
	debug_unregister(kvm->arch.dbf);
240 241
out_nodbf:
	free_page((unsigned long)(kvm->arch.sca));
242 243
out_err:
	return rc;
244 245
}

246 247 248
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
	VCPU_EVENT(vcpu, 3, "%s", "free cpu");
249
	trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
C
Carsten Otte 已提交
250 251 252 253 254 255 256
	if (!kvm_is_ucontrol(vcpu->kvm)) {
		clear_bit(63 - vcpu->vcpu_id,
			  (unsigned long *) &vcpu->kvm->arch.sca->mcn);
		if (vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda ==
		    (__u64) vcpu->arch.sie_block)
			vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda = 0;
	}
257
	smp_mb();
258 259 260 261

	if (kvm_is_ucontrol(vcpu->kvm))
		gmap_free(vcpu->arch.gmap);

262
	free_page((unsigned long)(vcpu->arch.sie_block));
263
	kvm_vcpu_uninit(vcpu);
264 265 266 267 268 269
	kfree(vcpu);
}

static void kvm_free_vcpus(struct kvm *kvm)
{
	unsigned int i;
270
	struct kvm_vcpu *vcpu;
271

272 273 274 275 276 277 278 279 280
	kvm_for_each_vcpu(i, vcpu, kvm)
		kvm_arch_vcpu_destroy(vcpu);

	mutex_lock(&kvm->lock);
	for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
		kvm->vcpus[i] = NULL;

	atomic_set(&kvm->online_vcpus, 0);
	mutex_unlock(&kvm->lock);
281 282
}

283 284 285 286
void kvm_arch_sync_events(struct kvm *kvm)
{
}

287 288
void kvm_arch_destroy_vm(struct kvm *kvm)
{
289
	kvm_free_vcpus(kvm);
290
	free_page((unsigned long)(kvm->arch.sca));
291
	debug_unregister(kvm->arch.dbf);
292 293
	if (!kvm_is_ucontrol(kvm))
		gmap_free(kvm->arch.gmap);
294 295 296 297 298
}

/* Section: vcpu related */
int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
{
299 300 301 302 303 304 305
	if (kvm_is_ucontrol(vcpu->kvm)) {
		vcpu->arch.gmap = gmap_alloc(current->mm);
		if (!vcpu->arch.gmap)
			return -ENOMEM;
		return 0;
	}

306
	vcpu->arch.gmap = vcpu->kvm->arch.gmap;
307 308
	vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
				    KVM_SYNC_GPRS |
309 310
				    KVM_SYNC_ACRS |
				    KVM_SYNC_CRS;
311 312 313 314 315
	return 0;
}

void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
{
316
	/* Nothing todo */
317 318 319 320 321 322 323 324
}

void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
	save_fp_regs(&vcpu->arch.host_fpregs);
	save_access_regs(vcpu->arch.host_acrs);
	vcpu->arch.guest_fpregs.fpc &= FPC_VALID_MASK;
	restore_fp_regs(&vcpu->arch.guest_fpregs);
325
	restore_access_regs(vcpu->run->s.regs.acrs);
326
	gmap_enable(vcpu->arch.gmap);
327
	atomic_set_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
328 329 330 331
}

void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
332
	atomic_clear_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
333
	gmap_disable(vcpu->arch.gmap);
334
	save_fp_regs(&vcpu->arch.guest_fpregs);
335
	save_access_regs(vcpu->run->s.regs.acrs);
336 337 338 339 340 341 342 343 344
	restore_fp_regs(&vcpu->arch.host_fpregs);
	restore_access_regs(vcpu->arch.host_acrs);
}

static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu)
{
	/* this equals initial cpu reset in pop, but we don't switch to ESA */
	vcpu->arch.sie_block->gpsw.mask = 0UL;
	vcpu->arch.sie_block->gpsw.addr = 0UL;
345
	kvm_s390_set_prefix(vcpu, 0);
346 347 348 349 350 351 352 353 354
	vcpu->arch.sie_block->cputm     = 0UL;
	vcpu->arch.sie_block->ckc       = 0UL;
	vcpu->arch.sie_block->todpr     = 0;
	memset(vcpu->arch.sie_block->gcr, 0, 16 * sizeof(__u64));
	vcpu->arch.sie_block->gcr[0]  = 0xE0UL;
	vcpu->arch.sie_block->gcr[14] = 0xC2000000UL;
	vcpu->arch.guest_fpregs.fpc = 0;
	asm volatile("lfpc %0" : : "Q" (vcpu->arch.guest_fpregs.fpc));
	vcpu->arch.sie_block->gbea = 1;
355
	atomic_set_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
356 357
}

358 359 360 361 362
int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
{
	return 0;
}

363 364
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
{
365 366 367
	atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH |
						    CPUSTAT_SM |
						    CPUSTAT_STOPPED);
368
	vcpu->arch.sie_block->ecb   = 6;
369
	vcpu->arch.sie_block->eca   = 0xC1002001U;
370
	vcpu->arch.sie_block->fac   = (int) (long) facilities;
371 372 373 374
	hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
	tasklet_init(&vcpu->arch.tasklet, kvm_s390_tasklet,
		     (unsigned long) vcpu);
	vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
375
	get_cpu_id(&vcpu->arch.cpu_id);
376
	vcpu->arch.cpu_id.version = 0xff;
377 378 379 380 381 382
	return 0;
}

struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
				      unsigned int id)
{
383 384 385 386 387 388 389
	struct kvm_vcpu *vcpu;
	int rc = -EINVAL;

	if (id >= KVM_MAX_VCPUS)
		goto out;

	rc = -ENOMEM;
390

391
	vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
392
	if (!vcpu)
393
		goto out;
394

395 396
	vcpu->arch.sie_block = (struct kvm_s390_sie_block *)
					get_zeroed_page(GFP_KERNEL);
397 398 399 400 401

	if (!vcpu->arch.sie_block)
		goto out_free_cpu;

	vcpu->arch.sie_block->icpua = id;
C
Carsten Otte 已提交
402 403 404 405 406 407 408 409 410 411 412 413 414
	if (!kvm_is_ucontrol(kvm)) {
		if (!kvm->arch.sca) {
			WARN_ON_ONCE(1);
			goto out_free_cpu;
		}
		if (!kvm->arch.sca->cpu[id].sda)
			kvm->arch.sca->cpu[id].sda =
				(__u64) vcpu->arch.sie_block;
		vcpu->arch.sie_block->scaoh =
			(__u32)(((__u64)kvm->arch.sca) >> 32);
		vcpu->arch.sie_block->scaol = (__u32)(__u64)kvm->arch.sca;
		set_bit(63 - id, (unsigned long *) &kvm->arch.sca->mcn);
	}
415

416 417 418
	spin_lock_init(&vcpu->arch.local_int.lock);
	INIT_LIST_HEAD(&vcpu->arch.local_int.list);
	vcpu->arch.local_int.float_int = &kvm->arch.float_int;
419
	spin_lock(&kvm->arch.float_int.lock);
420 421
	kvm->arch.float_int.local_int[id] = &vcpu->arch.local_int;
	init_waitqueue_head(&vcpu->arch.local_int.wq);
422
	vcpu->arch.local_int.cpuflags = &vcpu->arch.sie_block->cpuflags;
423
	spin_unlock(&kvm->arch.float_int.lock);
424

425 426
	rc = kvm_vcpu_init(vcpu, kvm, id);
	if (rc)
427
		goto out_free_sie_block;
428 429
	VM_EVENT(kvm, 3, "create cpu %d at %p, sie block at %p", id, vcpu,
		 vcpu->arch.sie_block);
430
	trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block);
431 432

	return vcpu;
433 434
out_free_sie_block:
	free_page((unsigned long)(vcpu->arch.sie_block));
435 436
out_free_cpu:
	kfree(vcpu);
437
out:
438 439 440 441 442 443 444 445 446 447
	return ERR_PTR(rc);
}

int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
{
	/* kvm common code refers to this, but never calls it */
	BUG();
	return 0;
}

448 449 450 451 452 453 454
int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
{
	/* kvm common code refers to this, but never calls it */
	BUG();
	return 0;
}

455 456 457 458 459 460
static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
					   struct kvm_one_reg *reg)
{
	int r = -EINVAL;

	switch (reg->id) {
461 462 463 464 465 466 467 468
	case KVM_REG_S390_TODPR:
		r = put_user(vcpu->arch.sie_block->todpr,
			     (u32 __user *)reg->addr);
		break;
	case KVM_REG_S390_EPOCHDIFF:
		r = put_user(vcpu->arch.sie_block->epoch,
			     (u64 __user *)reg->addr);
		break;
469 470 471 472 473 474 475 476
	case KVM_REG_S390_CPU_TIMER:
		r = put_user(vcpu->arch.sie_block->cputm,
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_CLOCK_COMP:
		r = put_user(vcpu->arch.sie_block->ckc,
			     (u64 __user *)reg->addr);
		break;
477 478 479 480 481 482 483 484 485 486 487 488 489
	default:
		break;
	}

	return r;
}

static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,
					   struct kvm_one_reg *reg)
{
	int r = -EINVAL;

	switch (reg->id) {
490 491 492 493 494 495 496 497
	case KVM_REG_S390_TODPR:
		r = get_user(vcpu->arch.sie_block->todpr,
			     (u32 __user *)reg->addr);
		break;
	case KVM_REG_S390_EPOCHDIFF:
		r = get_user(vcpu->arch.sie_block->epoch,
			     (u64 __user *)reg->addr);
		break;
498 499 500 501 502 503 504 505
	case KVM_REG_S390_CPU_TIMER:
		r = get_user(vcpu->arch.sie_block->cputm,
			     (u64 __user *)reg->addr);
		break;
	case KVM_REG_S390_CLOCK_COMP:
		r = get_user(vcpu->arch.sie_block->ckc,
			     (u64 __user *)reg->addr);
		break;
506 507 508 509 510 511
	default:
		break;
	}

	return r;
}
512

513 514 515 516 517 518 519 520
static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
{
	kvm_s390_vcpu_initial_reset(vcpu);
	return 0;
}

int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
521
	memcpy(&vcpu->run->s.regs.gprs, &regs->gprs, sizeof(regs->gprs));
522 523 524 525 526
	return 0;
}

int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
527
	memcpy(&regs->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs));
528 529 530 531 532 533
	return 0;
}

int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
				  struct kvm_sregs *sregs)
{
534
	memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs));
535
	memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs));
536
	restore_access_regs(vcpu->run->s.regs.acrs);
537 538 539 540 541 542
	return 0;
}

int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
				  struct kvm_sregs *sregs)
{
543
	memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs));
544 545 546 547 548 549 550
	memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs));
	return 0;
}

int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
	memcpy(&vcpu->arch.guest_fpregs.fprs, &fpu->fprs, sizeof(fpu->fprs));
551
	vcpu->arch.guest_fpregs.fpc = fpu->fpc & FPC_VALID_MASK;
C
Carsten Otte 已提交
552
	restore_fp_regs(&vcpu->arch.guest_fpregs);
553 554 555 556 557 558 559 560 561 562 563 564 565 566
	return 0;
}

int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
	memcpy(&fpu->fprs, &vcpu->arch.guest_fpregs.fprs, sizeof(fpu->fprs));
	fpu->fpc = vcpu->arch.guest_fpregs.fpc;
	return 0;
}

static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)
{
	int rc = 0;

567
	if (!(atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_STOPPED))
568
		rc = -EBUSY;
569 570 571 572
	else {
		vcpu->run->psw_mask = psw.mask;
		vcpu->run->psw_addr = psw.addr;
	}
573 574 575 576 577 578 579 580 581
	return rc;
}

int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
				  struct kvm_translation *tr)
{
	return -EINVAL; /* not implemented yet */
}

J
Jan Kiszka 已提交
582 583
int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
					struct kvm_guest_debug *dbg)
584 585 586 587
{
	return -EINVAL; /* not implemented yet */
}

588 589 590 591 592 593 594 595 596 597 598 599
int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
				    struct kvm_mp_state *mp_state)
{
	return -EINVAL; /* not implemented yet */
}

int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
				    struct kvm_mp_state *mp_state)
{
	return -EINVAL; /* not implemented yet */
}

600
static int __vcpu_run(struct kvm_vcpu *vcpu)
601
{
602 603
	int rc;

604
	memcpy(&vcpu->arch.sie_block->gg14, &vcpu->run->s.regs.gprs[14], 16);
605 606 607 608

	if (need_resched())
		schedule();

609 610 611
	if (test_thread_flag(TIF_MCCK_PENDING))
		s390_handle_mcck();

612 613
	if (!kvm_is_ucontrol(vcpu->kvm))
		kvm_s390_deliver_pending_interrupts(vcpu);
C
Carsten Otte 已提交
614

615 616 617 618
	vcpu->arch.sie_block->icptcode = 0;
	kvm_guest_enter();
	VCPU_EVENT(vcpu, 6, "entering sie flags %x",
		   atomic_read(&vcpu->arch.sie_block->cpuflags));
619 620
	trace_kvm_s390_sie_enter(vcpu,
				 atomic_read(&vcpu->arch.sie_block->cpuflags));
621
	rc = sie64a(vcpu->arch.sie_block, vcpu->run->s.regs.gprs);
622 623 624 625 626
	if (rc) {
		if (kvm_is_ucontrol(vcpu->kvm)) {
			rc = SIE_INTERCEPT_UCONTROL;
		} else {
			VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction");
627
			trace_kvm_s390_sie_fault(vcpu);
628 629 630
			kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
			rc = 0;
		}
631
	}
632 633
	VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
		   vcpu->arch.sie_block->icptcode);
634
	trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode);
635 636
	kvm_guest_exit();

637
	memcpy(&vcpu->run->s.regs.gprs[14], &vcpu->arch.sie_block->gg14, 16);
638
	return rc;
639 640 641 642
}

int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
643
	int rc;
644 645
	sigset_t sigsaved;

646
rerun_vcpu:
647 648 649
	if (vcpu->sigset_active)
		sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);

650
	atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
651

652 653
	BUG_ON(vcpu->kvm->arch.float_int.local_int[vcpu->vcpu_id] == NULL);

654 655 656
	switch (kvm_run->exit_reason) {
	case KVM_EXIT_S390_SIEIC:
	case KVM_EXIT_UNKNOWN:
657
	case KVM_EXIT_INTR:
658
	case KVM_EXIT_S390_RESET:
659
	case KVM_EXIT_S390_UCONTROL:
660 661 662 663 664
		break;
	default:
		BUG();
	}

665 666
	vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask;
	vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr;
667 668 669 670
	if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX) {
		kvm_run->kvm_dirty_regs &= ~KVM_SYNC_PREFIX;
		kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
	}
671 672 673 674 675
	if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) {
		kvm_run->kvm_dirty_regs &= ~KVM_SYNC_CRS;
		memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128);
		kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
	}
676

677
	might_fault();
678 679

	do {
680 681 682
		rc = __vcpu_run(vcpu);
		if (rc)
			break;
683 684 685 686
		if (kvm_is_ucontrol(vcpu->kvm))
			rc = -EOPNOTSUPP;
		else
			rc = kvm_handle_sie_intercept(vcpu);
687 688
	} while (!signal_pending(current) && !rc);

689 690 691
	if (rc == SIE_INTERCEPT_RERUNVCPU)
		goto rerun_vcpu;

692 693
	if (signal_pending(current) && !rc) {
		kvm_run->exit_reason = KVM_EXIT_INTR;
694
		rc = -EINTR;
695
	}
696

697 698 699 700 701 702 703 704 705 706
#ifdef CONFIG_KVM_S390_UCONTROL
	if (rc == SIE_INTERCEPT_UCONTROL) {
		kvm_run->exit_reason = KVM_EXIT_S390_UCONTROL;
		kvm_run->s390_ucontrol.trans_exc_code =
			current->thread.gmap_addr;
		kvm_run->s390_ucontrol.pgm_code = 0x10;
		rc = 0;
	}
#endif

707
	if (rc == -EOPNOTSUPP) {
708 709 710 711 712 713 714 715 716 717 718 719 720
		/* intercept cannot be handled in-kernel, prepare kvm-run */
		kvm_run->exit_reason         = KVM_EXIT_S390_SIEIC;
		kvm_run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode;
		kvm_run->s390_sieic.ipa      = vcpu->arch.sie_block->ipa;
		kvm_run->s390_sieic.ipb      = vcpu->arch.sie_block->ipb;
		rc = 0;
	}

	if (rc == -EREMOTE) {
		/* intercept was handled, but userspace support is needed
		 * kvm_run has been prepared by the handler */
		rc = 0;
	}
721

722 723
	kvm_run->psw_mask     = vcpu->arch.sie_block->gpsw.mask;
	kvm_run->psw_addr     = vcpu->arch.sie_block->gpsw.addr;
724
	kvm_run->s.regs.prefix = vcpu->arch.sie_block->prefix;
725
	memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128);
726

727 728 729 730
	if (vcpu->sigset_active)
		sigprocmask(SIG_SETMASK, &sigsaved, NULL);

	vcpu->stat.exit_userspace++;
731
	return rc;
732 733
}

734
static int __guestcopy(struct kvm_vcpu *vcpu, u64 guestdest, void *from,
735 736 737 738 739 740 741 742 743 744 745 746 747 748
		       unsigned long n, int prefix)
{
	if (prefix)
		return copy_to_guest(vcpu, guestdest, from, n);
	else
		return copy_to_guest_absolute(vcpu, guestdest, from, n);
}

/*
 * store status at address
 * we use have two special cases:
 * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit
 * KVM_S390_STORE_STATUS_PREFIXED: -> prefix
 */
749
int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
750
{
751
	unsigned char archmode = 1;
752 753 754 755 756 757 758 759 760 761 762 763 764 765 766
	int prefix;

	if (addr == KVM_S390_STORE_STATUS_NOADDR) {
		if (copy_to_guest_absolute(vcpu, 163ul, &archmode, 1))
			return -EFAULT;
		addr = SAVE_AREA_BASE;
		prefix = 0;
	} else if (addr == KVM_S390_STORE_STATUS_PREFIXED) {
		if (copy_to_guest(vcpu, 163ul, &archmode, 1))
			return -EFAULT;
		addr = SAVE_AREA_BASE;
		prefix = 1;
	} else
		prefix = 0;

767
	if (__guestcopy(vcpu, addr + offsetof(struct save_area, fp_regs),
768 769 770
			vcpu->arch.guest_fpregs.fprs, 128, prefix))
		return -EFAULT;

771
	if (__guestcopy(vcpu, addr + offsetof(struct save_area, gp_regs),
772
			vcpu->run->s.regs.gprs, 128, prefix))
773 774
		return -EFAULT;

775
	if (__guestcopy(vcpu, addr + offsetof(struct save_area, psw),
776 777 778
			&vcpu->arch.sie_block->gpsw, 16, prefix))
		return -EFAULT;

779
	if (__guestcopy(vcpu, addr + offsetof(struct save_area, pref_reg),
780 781 782 783
			&vcpu->arch.sie_block->prefix, 4, prefix))
		return -EFAULT;

	if (__guestcopy(vcpu,
784
			addr + offsetof(struct save_area, fp_ctrl_reg),
785 786 787
			&vcpu->arch.guest_fpregs.fpc, 4, prefix))
		return -EFAULT;

788
	if (__guestcopy(vcpu, addr + offsetof(struct save_area, tod_reg),
789 790 791
			&vcpu->arch.sie_block->todpr, 4, prefix))
		return -EFAULT;

792
	if (__guestcopy(vcpu, addr + offsetof(struct save_area, timer),
793 794 795
			&vcpu->arch.sie_block->cputm, 8, prefix))
		return -EFAULT;

796
	if (__guestcopy(vcpu, addr + offsetof(struct save_area, clk_cmp),
797 798 799
			&vcpu->arch.sie_block->ckc, 8, prefix))
		return -EFAULT;

800
	if (__guestcopy(vcpu, addr + offsetof(struct save_area, acc_regs),
801
			&vcpu->run->s.regs.acrs, 64, prefix))
802 803 804
		return -EFAULT;

	if (__guestcopy(vcpu,
805
			addr + offsetof(struct save_area, ctrl_regs),
806 807 808 809 810 811 812 813 814 815
			&vcpu->arch.sie_block->gcr, 128, prefix))
		return -EFAULT;
	return 0;
}

long kvm_arch_vcpu_ioctl(struct file *filp,
			 unsigned int ioctl, unsigned long arg)
{
	struct kvm_vcpu *vcpu = filp->private_data;
	void __user *argp = (void __user *)arg;
816
	long r;
817

818 819
	switch (ioctl) {
	case KVM_S390_INTERRUPT: {
820 821
		struct kvm_s390_interrupt s390int;

822
		r = -EFAULT;
823
		if (copy_from_user(&s390int, argp, sizeof(s390int)))
824 825 826
			break;
		r = kvm_s390_inject_vcpu(vcpu, &s390int);
		break;
827
	}
828
	case KVM_S390_STORE_STATUS:
829 830
		r = kvm_s390_vcpu_store_status(vcpu, arg);
		break;
831 832 833
	case KVM_S390_SET_INITIAL_PSW: {
		psw_t psw;

834
		r = -EFAULT;
835
		if (copy_from_user(&psw, argp, sizeof(psw)))
836 837 838
			break;
		r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw);
		break;
839 840
	}
	case KVM_S390_INITIAL_RESET:
841 842
		r = kvm_arch_vcpu_ioctl_initial_reset(vcpu);
		break;
843 844 845 846 847 848 849 850 851 852 853 854
	case KVM_SET_ONE_REG:
	case KVM_GET_ONE_REG: {
		struct kvm_one_reg reg;
		r = -EFAULT;
		if (copy_from_user(&reg, argp, sizeof(reg)))
			break;
		if (ioctl == KVM_SET_ONE_REG)
			r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, &reg);
		else
			r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, &reg);
		break;
	}
855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890
#ifdef CONFIG_KVM_S390_UCONTROL
	case KVM_S390_UCAS_MAP: {
		struct kvm_s390_ucas_mapping ucasmap;

		if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
			r = -EFAULT;
			break;
		}

		if (!kvm_is_ucontrol(vcpu->kvm)) {
			r = -EINVAL;
			break;
		}

		r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr,
				     ucasmap.vcpu_addr, ucasmap.length);
		break;
	}
	case KVM_S390_UCAS_UNMAP: {
		struct kvm_s390_ucas_mapping ucasmap;

		if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
			r = -EFAULT;
			break;
		}

		if (!kvm_is_ucontrol(vcpu->kvm)) {
			r = -EINVAL;
			break;
		}

		r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr,
			ucasmap.length);
		break;
	}
#endif
891 892 893 894 895 896
	case KVM_S390_VCPU_FAULT: {
		r = gmap_fault(arg, vcpu->arch.gmap);
		if (!IS_ERR_VALUE(r))
			r = 0;
		break;
	}
897
	default:
898
		r = -ENOTTY;
899
	}
900
	return r;
901 902
}

903 904 905 906 907 908 909 910 911 912 913 914 915
int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
{
#ifdef CONFIG_KVM_S390_UCONTROL
	if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET)
		 && (kvm_is_ucontrol(vcpu->kvm))) {
		vmf->page = virt_to_page(vcpu->arch.sie_block);
		get_page(vmf->page);
		return 0;
	}
#endif
	return VM_FAULT_SIGBUS;
}

916 917 918 919 920 921 922 923 924 925
void kvm_arch_free_memslot(struct kvm_memory_slot *free,
			   struct kvm_memory_slot *dont)
{
}

int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
{
	return 0;
}

926
/* Section: memory related */
927 928 929 930 931
int kvm_arch_prepare_memory_region(struct kvm *kvm,
				   struct kvm_memory_slot *memslot,
				   struct kvm_memory_slot old,
				   struct kvm_userspace_memory_region *mem,
				   int user_alloc)
932 933 934 935 936 937 938 939
{
	/* A few sanity checks. We can have exactly one memory slot which has
	   to start at guest virtual zero and which has to be located at a
	   page boundary in userland and which has to end at a page boundary.
	   The memory in userland is ok to be fragmented into various different
	   vmas. It is okay to mmap() and munmap() stuff in this slot after
	   doing this call at any time */

940
	if (mem->slot)
941 942 943 944 945
		return -EINVAL;

	if (mem->guest_phys_addr)
		return -EINVAL;

946
	if (mem->userspace_addr & 0xffffful)
947 948
		return -EINVAL;

949
	if (mem->memory_size & 0xffffful)
950 951
		return -EINVAL;

952 953 954
	if (!user_alloc)
		return -EINVAL;

955 956 957 958 959 960 961 962
	return 0;
}

void kvm_arch_commit_memory_region(struct kvm *kvm,
				struct kvm_userspace_memory_region *mem,
				struct kvm_memory_slot old,
				int user_alloc)
{
963
	int rc;
964

965 966 967 968

	rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr,
		mem->guest_phys_addr, mem->memory_size);
	if (rc)
969
		printk(KERN_WARNING "kvm-s390: failed to commit memory region\n");
970
	return;
971 972
}

973 974 975 976 977 978
void kvm_arch_flush_shadow_all(struct kvm *kvm)
{
}

void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
				   struct kvm_memory_slot *slot)
979 980 981
{
}

982 983
static int __init kvm_s390_init(void)
{
984
	int ret;
985
	ret = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
986 987 988 989 990
	if (ret)
		return ret;

	/*
	 * guests can ask for up to 255+1 double words, we need a full page
L
Lucas De Marchi 已提交
991
	 * to hold the maximum amount of facilities. On the other hand, we
992 993
	 * only set facilities that are known to work in KVM.
	 */
994
	facilities = (unsigned long long *) get_zeroed_page(GFP_KERNEL|GFP_DMA);
995 996 997 998
	if (!facilities) {
		kvm_exit();
		return -ENOMEM;
	}
999
	memcpy(facilities, S390_lowcore.stfle_fac_list, 16);
1000
	facilities[0] &= 0xff00fff3f47c0000ULL;
1001
	facilities[1] &= 0x001c000000000000ULL;
1002
	return 0;
1003 1004 1005 1006
}

static void __exit kvm_s390_exit(void)
{
1007
	free_page((unsigned long) facilities);
1008 1009 1010 1011 1012
	kvm_exit();
}

module_init(kvm_s390_init);
module_exit(kvm_s390_exit);