2 * hosting zSeries kernel virtual machines
4 * Copyright IBM Corp. 2008, 2009
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.
10 * Author(s): Carsten Otte <cotte@de.ibm.com>
11 * Christian Borntraeger <borntraeger@de.ibm.com>
12 * Heiko Carstens <heiko.carstens@de.ibm.com>
13 * Christian Ehrhardt <ehrhardt@de.ibm.com>
16 #include <linux/compiler.h>
17 #include <linux/err.h>
19 #include <linux/hrtimer.h>
20 #include <linux/init.h>
21 #include <linux/kvm.h>
22 #include <linux/kvm_host.h>
23 #include <linux/module.h>
24 #include <linux/slab.h>
25 #include <linux/timer.h>
26 #include <asm/asm-offsets.h>
27 #include <asm/lowcore.h>
28 #include <asm/pgtable.h>
30 #include <asm/switch_to.h>
31 #include <asm/facility.h>
36 #define CREATE_TRACE_POINTS
38 #include "trace-s390.h"
40 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
42 struct kvm_stats_debugfs_item debugfs_entries[] = {
43 { "userspace_handled", VCPU_STAT(exit_userspace) },
44 { "exit_null", VCPU_STAT(exit_null) },
45 { "exit_validity", VCPU_STAT(exit_validity) },
46 { "exit_stop_request", VCPU_STAT(exit_stop_request) },
47 { "exit_external_request", VCPU_STAT(exit_external_request) },
48 { "exit_external_interrupt", VCPU_STAT(exit_external_interrupt) },
49 { "exit_instruction", VCPU_STAT(exit_instruction) },
50 { "exit_program_interruption", VCPU_STAT(exit_program_interruption) },
51 { "exit_instr_and_program_int", VCPU_STAT(exit_instr_and_program) },
52 { "instruction_lctlg", VCPU_STAT(instruction_lctlg) },
53 { "instruction_lctl", VCPU_STAT(instruction_lctl) },
54 { "deliver_emergency_signal", VCPU_STAT(deliver_emergency_signal) },
55 { "deliver_external_call", VCPU_STAT(deliver_external_call) },
56 { "deliver_service_signal", VCPU_STAT(deliver_service_signal) },
57 { "deliver_virtio_interrupt", VCPU_STAT(deliver_virtio_interrupt) },
58 { "deliver_stop_signal", VCPU_STAT(deliver_stop_signal) },
59 { "deliver_prefix_signal", VCPU_STAT(deliver_prefix_signal) },
60 { "deliver_restart_signal", VCPU_STAT(deliver_restart_signal) },
61 { "deliver_program_interruption", VCPU_STAT(deliver_program_int) },
62 { "exit_wait_state", VCPU_STAT(exit_wait_state) },
63 { "instruction_pfmf", VCPU_STAT(instruction_pfmf) },
64 { "instruction_stidp", VCPU_STAT(instruction_stidp) },
65 { "instruction_spx", VCPU_STAT(instruction_spx) },
66 { "instruction_stpx", VCPU_STAT(instruction_stpx) },
67 { "instruction_stap", VCPU_STAT(instruction_stap) },
68 { "instruction_storage_key", VCPU_STAT(instruction_storage_key) },
69 { "instruction_stsch", VCPU_STAT(instruction_stsch) },
70 { "instruction_chsc", VCPU_STAT(instruction_chsc) },
71 { "instruction_stsi", VCPU_STAT(instruction_stsi) },
72 { "instruction_stfl", VCPU_STAT(instruction_stfl) },
73 { "instruction_tprot", VCPU_STAT(instruction_tprot) },
74 { "instruction_sigp_sense", VCPU_STAT(instruction_sigp_sense) },
75 { "instruction_sigp_sense_running", VCPU_STAT(instruction_sigp_sense_running) },
76 { "instruction_sigp_external_call", VCPU_STAT(instruction_sigp_external_call) },
77 { "instruction_sigp_emergency", VCPU_STAT(instruction_sigp_emergency) },
78 { "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) },
79 { "instruction_sigp_set_arch", VCPU_STAT(instruction_sigp_arch) },
80 { "instruction_sigp_set_prefix", VCPU_STAT(instruction_sigp_prefix) },
81 { "instruction_sigp_restart", VCPU_STAT(instruction_sigp_restart) },
82 { "diagnose_10", VCPU_STAT(diagnose_10) },
83 { "diagnose_44", VCPU_STAT(diagnose_44) },
84 { "diagnose_9c", VCPU_STAT(diagnose_9c) },
88 unsigned long *vfacilities;
89 static struct gmap_notifier gmap_notifier;
91 /* test availability of vfacility */
92 static inline int test_vfacility(unsigned long nr)
94 return __test_facility(nr, (void *) vfacilities);
97 /* Section: not file related */
98 int kvm_arch_hardware_enable(void *garbage)
100 /* every s390 is virtualization enabled ;-) */
104 void kvm_arch_hardware_disable(void *garbage)
108 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long address);
110 int kvm_arch_hardware_setup(void)
112 gmap_notifier.notifier_call = kvm_gmap_notifier;
113 gmap_register_ipte_notifier(&gmap_notifier);
117 void kvm_arch_hardware_unsetup(void)
119 gmap_unregister_ipte_notifier(&gmap_notifier);
122 void kvm_arch_check_processor_compat(void *rtn)
126 int kvm_arch_init(void *opaque)
131 void kvm_arch_exit(void)
135 /* Section: device related */
136 long kvm_arch_dev_ioctl(struct file *filp,
137 unsigned int ioctl, unsigned long arg)
139 if (ioctl == KVM_S390_ENABLE_SIE)
140 return s390_enable_sie();
144 int kvm_dev_ioctl_check_extension(long ext)
149 case KVM_CAP_S390_PSW:
150 case KVM_CAP_S390_GMAP:
151 case KVM_CAP_SYNC_MMU:
152 #ifdef CONFIG_KVM_S390_UCONTROL
153 case KVM_CAP_S390_UCONTROL:
155 case KVM_CAP_SYNC_REGS:
156 case KVM_CAP_ONE_REG:
157 case KVM_CAP_ENABLE_CAP:
158 case KVM_CAP_S390_CSS_SUPPORT:
159 case KVM_CAP_IOEVENTFD:
162 case KVM_CAP_NR_VCPUS:
163 case KVM_CAP_MAX_VCPUS:
166 case KVM_CAP_NR_MEMSLOTS:
167 r = KVM_USER_MEM_SLOTS;
169 case KVM_CAP_S390_COW:
170 r = MACHINE_HAS_ESOP;
178 /* Section: vm related */
180 * Get (and clear) the dirty memory log for a memory slot.
182 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
183 struct kvm_dirty_log *log)
188 long kvm_arch_vm_ioctl(struct file *filp,
189 unsigned int ioctl, unsigned long arg)
191 struct kvm *kvm = filp->private_data;
192 void __user *argp = (void __user *)arg;
196 case KVM_S390_INTERRUPT: {
197 struct kvm_s390_interrupt s390int;
200 if (copy_from_user(&s390int, argp, sizeof(s390int)))
202 r = kvm_s390_inject_vm(kvm, &s390int);
212 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
218 #ifdef CONFIG_KVM_S390_UCONTROL
219 if (type & ~KVM_VM_S390_UCONTROL)
221 if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN)))
228 rc = s390_enable_sie();
234 kvm->arch.sca = (struct sca_block *) get_zeroed_page(GFP_KERNEL);
238 sprintf(debug_name, "kvm-%u", current->pid);
240 kvm->arch.dbf = debug_register(debug_name, 8, 2, 8 * sizeof(long));
244 spin_lock_init(&kvm->arch.float_int.lock);
245 INIT_LIST_HEAD(&kvm->arch.float_int.list);
247 debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
248 VM_EVENT(kvm, 3, "%s", "vm created");
250 if (type & KVM_VM_S390_UCONTROL) {
251 kvm->arch.gmap = NULL;
253 kvm->arch.gmap = gmap_alloc(current->mm);
256 kvm->arch.gmap->private = kvm;
259 kvm->arch.css_support = 0;
263 debug_unregister(kvm->arch.dbf);
265 free_page((unsigned long)(kvm->arch.sca));
270 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
272 VCPU_EVENT(vcpu, 3, "%s", "free cpu");
273 trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
274 if (!kvm_is_ucontrol(vcpu->kvm)) {
275 clear_bit(63 - vcpu->vcpu_id,
276 (unsigned long *) &vcpu->kvm->arch.sca->mcn);
277 if (vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda ==
278 (__u64) vcpu->arch.sie_block)
279 vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda = 0;
283 if (kvm_is_ucontrol(vcpu->kvm))
284 gmap_free(vcpu->arch.gmap);
286 free_page((unsigned long)(vcpu->arch.sie_block));
287 kvm_vcpu_uninit(vcpu);
288 kmem_cache_free(kvm_vcpu_cache, vcpu);
291 static void kvm_free_vcpus(struct kvm *kvm)
294 struct kvm_vcpu *vcpu;
296 kvm_for_each_vcpu(i, vcpu, kvm)
297 kvm_arch_vcpu_destroy(vcpu);
299 mutex_lock(&kvm->lock);
300 for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
301 kvm->vcpus[i] = NULL;
303 atomic_set(&kvm->online_vcpus, 0);
304 mutex_unlock(&kvm->lock);
307 void kvm_arch_sync_events(struct kvm *kvm)
311 void kvm_arch_destroy_vm(struct kvm *kvm)
314 free_page((unsigned long)(kvm->arch.sca));
315 debug_unregister(kvm->arch.dbf);
316 if (!kvm_is_ucontrol(kvm))
317 gmap_free(kvm->arch.gmap);
320 /* Section: vcpu related */
321 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
323 if (kvm_is_ucontrol(vcpu->kvm)) {
324 vcpu->arch.gmap = gmap_alloc(current->mm);
325 if (!vcpu->arch.gmap)
327 vcpu->arch.gmap->private = vcpu->kvm;
331 vcpu->arch.gmap = vcpu->kvm->arch.gmap;
332 vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
339 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
344 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
346 save_fp_ctl(&vcpu->arch.host_fpregs.fpc);
347 save_fp_regs(vcpu->arch.host_fpregs.fprs);
348 save_access_regs(vcpu->arch.host_acrs);
349 restore_fp_ctl(&vcpu->arch.guest_fpregs.fpc);
350 restore_fp_regs(vcpu->arch.guest_fpregs.fprs);
351 restore_access_regs(vcpu->run->s.regs.acrs);
352 gmap_enable(vcpu->arch.gmap);
353 atomic_set_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
356 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
358 atomic_clear_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
359 gmap_disable(vcpu->arch.gmap);
360 save_fp_ctl(&vcpu->arch.guest_fpregs.fpc);
361 save_fp_regs(vcpu->arch.guest_fpregs.fprs);
362 save_access_regs(vcpu->run->s.regs.acrs);
363 restore_fp_ctl(&vcpu->arch.host_fpregs.fpc);
364 restore_fp_regs(vcpu->arch.host_fpregs.fprs);
365 restore_access_regs(vcpu->arch.host_acrs);
368 static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu)
370 /* this equals initial cpu reset in pop, but we don't switch to ESA */
371 vcpu->arch.sie_block->gpsw.mask = 0UL;
372 vcpu->arch.sie_block->gpsw.addr = 0UL;
373 kvm_s390_set_prefix(vcpu, 0);
374 vcpu->arch.sie_block->cputm = 0UL;
375 vcpu->arch.sie_block->ckc = 0UL;
376 vcpu->arch.sie_block->todpr = 0;
377 memset(vcpu->arch.sie_block->gcr, 0, 16 * sizeof(__u64));
378 vcpu->arch.sie_block->gcr[0] = 0xE0UL;
379 vcpu->arch.sie_block->gcr[14] = 0xC2000000UL;
380 vcpu->arch.guest_fpregs.fpc = 0;
381 asm volatile("lfpc %0" : : "Q" (vcpu->arch.guest_fpregs.fpc));
382 vcpu->arch.sie_block->gbea = 1;
383 atomic_set_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
386 int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
391 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
393 atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH |
397 vcpu->arch.sie_block->ecb = 6;
398 if (test_vfacility(50) && test_vfacility(73))
399 vcpu->arch.sie_block->ecb |= 0x10;
401 vcpu->arch.sie_block->ecb2 = 8;
402 vcpu->arch.sie_block->eca = 0xC1002001U;
403 vcpu->arch.sie_block->fac = (int) (long) vfacilities;
404 hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
405 tasklet_init(&vcpu->arch.tasklet, kvm_s390_tasklet,
406 (unsigned long) vcpu);
407 vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
408 get_cpu_id(&vcpu->arch.cpu_id);
409 vcpu->arch.cpu_id.version = 0xff;
413 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
416 struct kvm_vcpu *vcpu;
417 struct sie_page *sie_page;
420 if (id >= KVM_MAX_VCPUS)
425 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
429 sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL);
433 vcpu->arch.sie_block = &sie_page->sie_block;
434 vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb;
436 vcpu->arch.sie_block->icpua = id;
437 if (!kvm_is_ucontrol(kvm)) {
438 if (!kvm->arch.sca) {
442 if (!kvm->arch.sca->cpu[id].sda)
443 kvm->arch.sca->cpu[id].sda =
444 (__u64) vcpu->arch.sie_block;
445 vcpu->arch.sie_block->scaoh =
446 (__u32)(((__u64)kvm->arch.sca) >> 32);
447 vcpu->arch.sie_block->scaol = (__u32)(__u64)kvm->arch.sca;
448 set_bit(63 - id, (unsigned long *) &kvm->arch.sca->mcn);
451 spin_lock_init(&vcpu->arch.local_int.lock);
452 INIT_LIST_HEAD(&vcpu->arch.local_int.list);
453 vcpu->arch.local_int.float_int = &kvm->arch.float_int;
454 spin_lock(&kvm->arch.float_int.lock);
455 kvm->arch.float_int.local_int[id] = &vcpu->arch.local_int;
456 vcpu->arch.local_int.wq = &vcpu->wq;
457 vcpu->arch.local_int.cpuflags = &vcpu->arch.sie_block->cpuflags;
458 spin_unlock(&kvm->arch.float_int.lock);
460 rc = kvm_vcpu_init(vcpu, kvm, id);
462 goto out_free_sie_block;
463 VM_EVENT(kvm, 3, "create cpu %d at %p, sie block at %p", id, vcpu,
464 vcpu->arch.sie_block);
465 trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block);
469 free_page((unsigned long)(vcpu->arch.sie_block));
471 kmem_cache_free(kvm_vcpu_cache, vcpu);
476 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
478 /* kvm common code refers to this, but never calls it */
483 void s390_vcpu_block(struct kvm_vcpu *vcpu)
485 atomic_set_mask(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
488 void s390_vcpu_unblock(struct kvm_vcpu *vcpu)
490 atomic_clear_mask(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
494 * Kick a guest cpu out of SIE and wait until SIE is not running.
495 * If the CPU is not running (e.g. waiting as idle) the function will
496 * return immediately. */
497 void exit_sie(struct kvm_vcpu *vcpu)
499 atomic_set_mask(CPUSTAT_STOP_INT, &vcpu->arch.sie_block->cpuflags);
500 while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE)
504 /* Kick a guest cpu out of SIE and prevent SIE-reentry */
505 void exit_sie_sync(struct kvm_vcpu *vcpu)
507 s390_vcpu_block(vcpu);
511 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long address)
514 struct kvm *kvm = gmap->private;
515 struct kvm_vcpu *vcpu;
517 kvm_for_each_vcpu(i, vcpu, kvm) {
518 /* match against both prefix pages */
519 if (vcpu->arch.sie_block->prefix == (address & ~0x1000UL)) {
520 VCPU_EVENT(vcpu, 2, "gmap notifier for %lx", address);
521 kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
527 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
529 /* kvm common code refers to this, but never calls it */
534 static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
535 struct kvm_one_reg *reg)
540 case KVM_REG_S390_TODPR:
541 r = put_user(vcpu->arch.sie_block->todpr,
542 (u32 __user *)reg->addr);
544 case KVM_REG_S390_EPOCHDIFF:
545 r = put_user(vcpu->arch.sie_block->epoch,
546 (u64 __user *)reg->addr);
548 case KVM_REG_S390_CPU_TIMER:
549 r = put_user(vcpu->arch.sie_block->cputm,
550 (u64 __user *)reg->addr);
552 case KVM_REG_S390_CLOCK_COMP:
553 r = put_user(vcpu->arch.sie_block->ckc,
554 (u64 __user *)reg->addr);
563 static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,
564 struct kvm_one_reg *reg)
569 case KVM_REG_S390_TODPR:
570 r = get_user(vcpu->arch.sie_block->todpr,
571 (u32 __user *)reg->addr);
573 case KVM_REG_S390_EPOCHDIFF:
574 r = get_user(vcpu->arch.sie_block->epoch,
575 (u64 __user *)reg->addr);
577 case KVM_REG_S390_CPU_TIMER:
578 r = get_user(vcpu->arch.sie_block->cputm,
579 (u64 __user *)reg->addr);
581 case KVM_REG_S390_CLOCK_COMP:
582 r = get_user(vcpu->arch.sie_block->ckc,
583 (u64 __user *)reg->addr);
592 static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
594 kvm_s390_vcpu_initial_reset(vcpu);
598 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
600 memcpy(&vcpu->run->s.regs.gprs, ®s->gprs, sizeof(regs->gprs));
604 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
606 memcpy(®s->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs));
610 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
611 struct kvm_sregs *sregs)
613 memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs));
614 memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs));
615 restore_access_regs(vcpu->run->s.regs.acrs);
619 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
620 struct kvm_sregs *sregs)
622 memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs));
623 memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs));
627 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
629 if (test_fp_ctl(fpu->fpc))
631 memcpy(&vcpu->arch.guest_fpregs.fprs, &fpu->fprs, sizeof(fpu->fprs));
632 vcpu->arch.guest_fpregs.fpc = fpu->fpc;
633 restore_fp_ctl(&vcpu->arch.guest_fpregs.fpc);
634 restore_fp_regs(vcpu->arch.guest_fpregs.fprs);
638 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
640 memcpy(&fpu->fprs, &vcpu->arch.guest_fpregs.fprs, sizeof(fpu->fprs));
641 fpu->fpc = vcpu->arch.guest_fpregs.fpc;
645 static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)
649 if (!(atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_STOPPED))
652 vcpu->run->psw_mask = psw.mask;
653 vcpu->run->psw_addr = psw.addr;
658 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
659 struct kvm_translation *tr)
661 return -EINVAL; /* not implemented yet */
664 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
665 struct kvm_guest_debug *dbg)
667 return -EINVAL; /* not implemented yet */
670 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
671 struct kvm_mp_state *mp_state)
673 return -EINVAL; /* not implemented yet */
676 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
677 struct kvm_mp_state *mp_state)
679 return -EINVAL; /* not implemented yet */
682 static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
685 * We use MMU_RELOAD just to re-arm the ipte notifier for the
686 * guest prefix page. gmap_ipte_notify will wait on the ptl lock.
687 * This ensures that the ipte instruction for this request has
688 * already finished. We might race against a second unmapper that
689 * wants to set the blocking bit. Lets just retry the request loop.
691 while (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) {
693 rc = gmap_ipte_notify(vcpu->arch.gmap,
694 vcpu->arch.sie_block->prefix,
698 s390_vcpu_unblock(vcpu);
703 static int vcpu_pre_run(struct kvm_vcpu *vcpu)
707 memcpy(&vcpu->arch.sie_block->gg14, &vcpu->run->s.regs.gprs[14], 16);
712 if (test_thread_flag(TIF_MCCK_PENDING))
715 if (!kvm_is_ucontrol(vcpu->kvm))
716 kvm_s390_deliver_pending_interrupts(vcpu);
718 rc = kvm_s390_handle_requests(vcpu);
722 vcpu->arch.sie_block->icptcode = 0;
723 cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags);
724 VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags);
725 trace_kvm_s390_sie_enter(vcpu, cpuflags);
730 static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason)
734 VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
735 vcpu->arch.sie_block->icptcode);
736 trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode);
738 if (exit_reason >= 0) {
740 } else if (kvm_is_ucontrol(vcpu->kvm)) {
741 vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL;
742 vcpu->run->s390_ucontrol.trans_exc_code =
743 current->thread.gmap_addr;
744 vcpu->run->s390_ucontrol.pgm_code = 0x10;
747 VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction");
748 trace_kvm_s390_sie_fault(vcpu);
749 rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
752 memcpy(&vcpu->run->s.regs.gprs[14], &vcpu->arch.sie_block->gg14, 16);
755 if (kvm_is_ucontrol(vcpu->kvm))
756 /* Don't exit for host interrupts. */
757 rc = vcpu->arch.sie_block->icptcode ? -EOPNOTSUPP : 0;
759 rc = kvm_handle_sie_intercept(vcpu);
765 static int __vcpu_run(struct kvm_vcpu *vcpu)
770 * We try to hold kvm->srcu during most of vcpu_run (except when run-
771 * ning the guest), so that memslots (and other stuff) are protected
773 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
776 rc = vcpu_pre_run(vcpu);
780 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
782 * As PF_VCPU will be used in fault handler, between
783 * guest_enter and guest_exit should be no uaccess.
788 exit_reason = sie64a(vcpu->arch.sie_block,
789 vcpu->run->s.regs.gprs);
791 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
793 rc = vcpu_post_run(vcpu, exit_reason);
794 } while (!signal_pending(current) && !rc);
796 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
800 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
805 if (vcpu->sigset_active)
806 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
808 atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
810 BUG_ON(vcpu->kvm->arch.float_int.local_int[vcpu->vcpu_id] == NULL);
812 switch (kvm_run->exit_reason) {
813 case KVM_EXIT_S390_SIEIC:
814 case KVM_EXIT_UNKNOWN:
816 case KVM_EXIT_S390_RESET:
817 case KVM_EXIT_S390_UCONTROL:
818 case KVM_EXIT_S390_TSCH:
824 vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask;
825 vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr;
826 if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX) {
827 kvm_run->kvm_dirty_regs &= ~KVM_SYNC_PREFIX;
828 kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
830 if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) {
831 kvm_run->kvm_dirty_regs &= ~KVM_SYNC_CRS;
832 memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128);
833 kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
837 rc = __vcpu_run(vcpu);
839 if (signal_pending(current) && !rc) {
840 kvm_run->exit_reason = KVM_EXIT_INTR;
844 if (rc == -EOPNOTSUPP) {
845 /* intercept cannot be handled in-kernel, prepare kvm-run */
846 kvm_run->exit_reason = KVM_EXIT_S390_SIEIC;
847 kvm_run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode;
848 kvm_run->s390_sieic.ipa = vcpu->arch.sie_block->ipa;
849 kvm_run->s390_sieic.ipb = vcpu->arch.sie_block->ipb;
853 if (rc == -EREMOTE) {
854 /* intercept was handled, but userspace support is needed
855 * kvm_run has been prepared by the handler */
859 kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask;
860 kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr;
861 kvm_run->s.regs.prefix = vcpu->arch.sie_block->prefix;
862 memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128);
864 if (vcpu->sigset_active)
865 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
867 vcpu->stat.exit_userspace++;
871 static int __guestcopy(struct kvm_vcpu *vcpu, u64 guestdest, void *from,
872 unsigned long n, int prefix)
875 return copy_to_guest(vcpu, guestdest, from, n);
877 return copy_to_guest_absolute(vcpu, guestdest, from, n);
881 * store status at address
882 * we use have two special cases:
883 * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit
884 * KVM_S390_STORE_STATUS_PREFIXED: -> prefix
886 int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long addr)
888 unsigned char archmode = 1;
892 if (addr == KVM_S390_STORE_STATUS_NOADDR) {
893 if (copy_to_guest_absolute(vcpu, 163ul, &archmode, 1))
895 addr = SAVE_AREA_BASE;
897 } else if (addr == KVM_S390_STORE_STATUS_PREFIXED) {
898 if (copy_to_guest(vcpu, 163ul, &archmode, 1))
900 addr = SAVE_AREA_BASE;
905 if (__guestcopy(vcpu, addr + offsetof(struct save_area, fp_regs),
906 vcpu->arch.guest_fpregs.fprs, 128, prefix))
909 if (__guestcopy(vcpu, addr + offsetof(struct save_area, gp_regs),
910 vcpu->run->s.regs.gprs, 128, prefix))
913 if (__guestcopy(vcpu, addr + offsetof(struct save_area, psw),
914 &vcpu->arch.sie_block->gpsw, 16, prefix))
917 if (__guestcopy(vcpu, addr + offsetof(struct save_area, pref_reg),
918 &vcpu->arch.sie_block->prefix, 4, prefix))
921 if (__guestcopy(vcpu,
922 addr + offsetof(struct save_area, fp_ctrl_reg),
923 &vcpu->arch.guest_fpregs.fpc, 4, prefix))
926 if (__guestcopy(vcpu, addr + offsetof(struct save_area, tod_reg),
927 &vcpu->arch.sie_block->todpr, 4, prefix))
930 if (__guestcopy(vcpu, addr + offsetof(struct save_area, timer),
931 &vcpu->arch.sie_block->cputm, 8, prefix))
934 clkcomp = vcpu->arch.sie_block->ckc >> 8;
935 if (__guestcopy(vcpu, addr + offsetof(struct save_area, clk_cmp),
936 &clkcomp, 8, prefix))
939 if (__guestcopy(vcpu, addr + offsetof(struct save_area, acc_regs),
940 &vcpu->run->s.regs.acrs, 64, prefix))
943 if (__guestcopy(vcpu,
944 addr + offsetof(struct save_area, ctrl_regs),
945 &vcpu->arch.sie_block->gcr, 128, prefix))
950 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
953 * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy
954 * copying in vcpu load/put. Lets update our copies before we save
955 * it into the save area
957 save_fp_ctl(&vcpu->arch.guest_fpregs.fpc);
958 save_fp_regs(vcpu->arch.guest_fpregs.fprs);
959 save_access_regs(vcpu->run->s.regs.acrs);
961 return kvm_s390_store_status_unloaded(vcpu, addr);
964 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
965 struct kvm_enable_cap *cap)
973 case KVM_CAP_S390_CSS_SUPPORT:
974 if (!vcpu->kvm->arch.css_support) {
975 vcpu->kvm->arch.css_support = 1;
976 trace_kvm_s390_enable_css(vcpu->kvm);
987 long kvm_arch_vcpu_ioctl(struct file *filp,
988 unsigned int ioctl, unsigned long arg)
990 struct kvm_vcpu *vcpu = filp->private_data;
991 void __user *argp = (void __user *)arg;
996 case KVM_S390_INTERRUPT: {
997 struct kvm_s390_interrupt s390int;
1000 if (copy_from_user(&s390int, argp, sizeof(s390int)))
1002 r = kvm_s390_inject_vcpu(vcpu, &s390int);
1005 case KVM_S390_STORE_STATUS:
1006 idx = srcu_read_lock(&vcpu->kvm->srcu);
1007 r = kvm_s390_vcpu_store_status(vcpu, arg);
1008 srcu_read_unlock(&vcpu->kvm->srcu, idx);
1010 case KVM_S390_SET_INITIAL_PSW: {
1014 if (copy_from_user(&psw, argp, sizeof(psw)))
1016 r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw);
1019 case KVM_S390_INITIAL_RESET:
1020 r = kvm_arch_vcpu_ioctl_initial_reset(vcpu);
1022 case KVM_SET_ONE_REG:
1023 case KVM_GET_ONE_REG: {
1024 struct kvm_one_reg reg;
1026 if (copy_from_user(®, argp, sizeof(reg)))
1028 if (ioctl == KVM_SET_ONE_REG)
1029 r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, ®);
1031 r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, ®);
1034 #ifdef CONFIG_KVM_S390_UCONTROL
1035 case KVM_S390_UCAS_MAP: {
1036 struct kvm_s390_ucas_mapping ucasmap;
1038 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
1043 if (!kvm_is_ucontrol(vcpu->kvm)) {
1048 r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr,
1049 ucasmap.vcpu_addr, ucasmap.length);
1052 case KVM_S390_UCAS_UNMAP: {
1053 struct kvm_s390_ucas_mapping ucasmap;
1055 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
1060 if (!kvm_is_ucontrol(vcpu->kvm)) {
1065 r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr,
1070 case KVM_S390_VCPU_FAULT: {
1071 r = gmap_fault(arg, vcpu->arch.gmap);
1072 if (!IS_ERR_VALUE(r))
1076 case KVM_ENABLE_CAP:
1078 struct kvm_enable_cap cap;
1080 if (copy_from_user(&cap, argp, sizeof(cap)))
1082 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
1091 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
1093 #ifdef CONFIG_KVM_S390_UCONTROL
1094 if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET)
1095 && (kvm_is_ucontrol(vcpu->kvm))) {
1096 vmf->page = virt_to_page(vcpu->arch.sie_block);
1097 get_page(vmf->page);
1101 return VM_FAULT_SIGBUS;
1104 void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
1105 struct kvm_memory_slot *dont)
1109 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
1110 unsigned long npages)
1115 void kvm_arch_memslots_updated(struct kvm *kvm)
1119 /* Section: memory related */
1120 int kvm_arch_prepare_memory_region(struct kvm *kvm,
1121 struct kvm_memory_slot *memslot,
1122 struct kvm_userspace_memory_region *mem,
1123 enum kvm_mr_change change)
1125 /* A few sanity checks. We can have memory slots which have to be
1126 located/ended at a segment boundary (1MB). The memory in userland is
1127 ok to be fragmented into various different vmas. It is okay to mmap()
1128 and munmap() stuff in this slot after doing this call at any time */
1130 if (mem->userspace_addr & 0xffffful)
1133 if (mem->memory_size & 0xffffful)
1139 void kvm_arch_commit_memory_region(struct kvm *kvm,
1140 struct kvm_userspace_memory_region *mem,
1141 const struct kvm_memory_slot *old,
1142 enum kvm_mr_change change)
1146 /* If the basics of the memslot do not change, we do not want
1147 * to update the gmap. Every update causes several unnecessary
1148 * segment translation exceptions. This is usually handled just
1149 * fine by the normal fault handler + gmap, but it will also
1150 * cause faults on the prefix page of running guest CPUs.
1152 if (old->userspace_addr == mem->userspace_addr &&
1153 old->base_gfn * PAGE_SIZE == mem->guest_phys_addr &&
1154 old->npages * PAGE_SIZE == mem->memory_size)
1157 rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr,
1158 mem->guest_phys_addr, mem->memory_size);
1160 printk(KERN_WARNING "kvm-s390: failed to commit memory region\n");
1164 void kvm_arch_flush_shadow_all(struct kvm *kvm)
1168 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
1169 struct kvm_memory_slot *slot)
1173 static int __init kvm_s390_init(void)
1176 ret = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1181 * guests can ask for up to 255+1 double words, we need a full page
1182 * to hold the maximum amount of facilities. On the other hand, we
1183 * only set facilities that are known to work in KVM.
1185 vfacilities = (unsigned long *) get_zeroed_page(GFP_KERNEL|GFP_DMA);
1190 memcpy(vfacilities, S390_lowcore.stfle_fac_list, 16);
1191 vfacilities[0] &= 0xff82fff3f4fc2000UL;
1192 vfacilities[1] &= 0x005c000000000000UL;
1196 static void __exit kvm_s390_exit(void)
1198 free_page((unsigned long) vfacilities);
1202 module_init(kvm_s390_init);
1203 module_exit(kvm_s390_exit);
1206 * Enable autoloading of the kvm module.
1207 * Note that we add the module alias here instead of virt/kvm/kvm_main.c
1208 * since x86 takes a different approach.
1210 #include <linux/miscdevice.h>
1211 MODULE_ALIAS_MISCDEV(KVM_MINOR);
1212 MODULE_ALIAS("devname:kvm");