2 * s390host.c -- 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/system.h>
34 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
36 struct kvm_stats_debugfs_item debugfs_entries[] = {
37 { "userspace_handled", VCPU_STAT(exit_userspace) },
38 { "exit_null", VCPU_STAT(exit_null) },
39 { "exit_validity", VCPU_STAT(exit_validity) },
40 { "exit_stop_request", VCPU_STAT(exit_stop_request) },
41 { "exit_external_request", VCPU_STAT(exit_external_request) },
42 { "exit_external_interrupt", VCPU_STAT(exit_external_interrupt) },
43 { "exit_instruction", VCPU_STAT(exit_instruction) },
44 { "exit_program_interruption", VCPU_STAT(exit_program_interruption) },
45 { "exit_instr_and_program_int", VCPU_STAT(exit_instr_and_program) },
46 { "instruction_lctlg", VCPU_STAT(instruction_lctlg) },
47 { "instruction_lctl", VCPU_STAT(instruction_lctl) },
48 { "deliver_emergency_signal", VCPU_STAT(deliver_emergency_signal) },
49 { "deliver_service_signal", VCPU_STAT(deliver_service_signal) },
50 { "deliver_virtio_interrupt", VCPU_STAT(deliver_virtio_interrupt) },
51 { "deliver_stop_signal", VCPU_STAT(deliver_stop_signal) },
52 { "deliver_prefix_signal", VCPU_STAT(deliver_prefix_signal) },
53 { "deliver_restart_signal", VCPU_STAT(deliver_restart_signal) },
54 { "deliver_program_interruption", VCPU_STAT(deliver_program_int) },
55 { "exit_wait_state", VCPU_STAT(exit_wait_state) },
56 { "instruction_stidp", VCPU_STAT(instruction_stidp) },
57 { "instruction_spx", VCPU_STAT(instruction_spx) },
58 { "instruction_stpx", VCPU_STAT(instruction_stpx) },
59 { "instruction_stap", VCPU_STAT(instruction_stap) },
60 { "instruction_storage_key", VCPU_STAT(instruction_storage_key) },
61 { "instruction_stsch", VCPU_STAT(instruction_stsch) },
62 { "instruction_chsc", VCPU_STAT(instruction_chsc) },
63 { "instruction_stsi", VCPU_STAT(instruction_stsi) },
64 { "instruction_stfl", VCPU_STAT(instruction_stfl) },
65 { "instruction_sigp_sense", VCPU_STAT(instruction_sigp_sense) },
66 { "instruction_sigp_emergency", VCPU_STAT(instruction_sigp_emergency) },
67 { "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) },
68 { "instruction_sigp_set_arch", VCPU_STAT(instruction_sigp_arch) },
69 { "instruction_sigp_set_prefix", VCPU_STAT(instruction_sigp_prefix) },
70 { "instruction_sigp_restart", VCPU_STAT(instruction_sigp_restart) },
71 { "diagnose_44", VCPU_STAT(diagnose_44) },
75 static unsigned long long *facilities;
77 /* Section: not file related */
78 int kvm_arch_hardware_enable(void *garbage)
80 /* every s390 is virtualization enabled ;-) */
84 void kvm_arch_hardware_disable(void *garbage)
88 int kvm_arch_hardware_setup(void)
93 void kvm_arch_hardware_unsetup(void)
97 void kvm_arch_check_processor_compat(void *rtn)
101 int kvm_arch_init(void *opaque)
106 void kvm_arch_exit(void)
110 /* Section: device related */
111 long kvm_arch_dev_ioctl(struct file *filp,
112 unsigned int ioctl, unsigned long arg)
114 if (ioctl == KVM_S390_ENABLE_SIE)
115 return s390_enable_sie();
119 int kvm_dev_ioctl_check_extension(long ext)
124 case KVM_CAP_S390_PSW:
133 /* Section: vm related */
135 * Get (and clear) the dirty memory log for a memory slot.
137 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
138 struct kvm_dirty_log *log)
143 long kvm_arch_vm_ioctl(struct file *filp,
144 unsigned int ioctl, unsigned long arg)
146 struct kvm *kvm = filp->private_data;
147 void __user *argp = (void __user *)arg;
151 case KVM_S390_INTERRUPT: {
152 struct kvm_s390_interrupt s390int;
155 if (copy_from_user(&s390int, argp, sizeof(s390int)))
157 r = kvm_s390_inject_vm(kvm, &s390int);
167 int kvm_arch_init_vm(struct kvm *kvm)
172 rc = s390_enable_sie();
176 kvm->arch.sca = (struct sca_block *) get_zeroed_page(GFP_KERNEL);
180 sprintf(debug_name, "kvm-%u", current->pid);
182 kvm->arch.dbf = debug_register(debug_name, 8, 2, 8 * sizeof(long));
186 spin_lock_init(&kvm->arch.float_int.lock);
187 INIT_LIST_HEAD(&kvm->arch.float_int.list);
189 debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
190 VM_EVENT(kvm, 3, "%s", "vm created");
194 free_page((unsigned long)(kvm->arch.sca));
199 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
201 VCPU_EVENT(vcpu, 3, "%s", "free cpu");
202 clear_bit(63 - vcpu->vcpu_id, (unsigned long *) &vcpu->kvm->arch.sca->mcn);
203 if (vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda ==
204 (__u64) vcpu->arch.sie_block)
205 vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda = 0;
207 free_page((unsigned long)(vcpu->arch.sie_block));
208 kvm_vcpu_uninit(vcpu);
212 static void kvm_free_vcpus(struct kvm *kvm)
215 struct kvm_vcpu *vcpu;
217 kvm_for_each_vcpu(i, vcpu, kvm)
218 kvm_arch_vcpu_destroy(vcpu);
220 mutex_lock(&kvm->lock);
221 for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
222 kvm->vcpus[i] = NULL;
224 atomic_set(&kvm->online_vcpus, 0);
225 mutex_unlock(&kvm->lock);
228 void kvm_arch_sync_events(struct kvm *kvm)
232 void kvm_arch_destroy_vm(struct kvm *kvm)
235 free_page((unsigned long)(kvm->arch.sca));
236 debug_unregister(kvm->arch.dbf);
239 /* Section: vcpu related */
240 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
245 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
250 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
252 save_fp_regs(&vcpu->arch.host_fpregs);
253 save_access_regs(vcpu->arch.host_acrs);
254 vcpu->arch.guest_fpregs.fpc &= FPC_VALID_MASK;
255 restore_fp_regs(&vcpu->arch.guest_fpregs);
256 restore_access_regs(vcpu->arch.guest_acrs);
259 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
261 save_fp_regs(&vcpu->arch.guest_fpregs);
262 save_access_regs(vcpu->arch.guest_acrs);
263 restore_fp_regs(&vcpu->arch.host_fpregs);
264 restore_access_regs(vcpu->arch.host_acrs);
267 static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu)
269 /* this equals initial cpu reset in pop, but we don't switch to ESA */
270 vcpu->arch.sie_block->gpsw.mask = 0UL;
271 vcpu->arch.sie_block->gpsw.addr = 0UL;
272 vcpu->arch.sie_block->prefix = 0UL;
273 vcpu->arch.sie_block->ihcpu = 0xffff;
274 vcpu->arch.sie_block->cputm = 0UL;
275 vcpu->arch.sie_block->ckc = 0UL;
276 vcpu->arch.sie_block->todpr = 0;
277 memset(vcpu->arch.sie_block->gcr, 0, 16 * sizeof(__u64));
278 vcpu->arch.sie_block->gcr[0] = 0xE0UL;
279 vcpu->arch.sie_block->gcr[14] = 0xC2000000UL;
280 vcpu->arch.guest_fpregs.fpc = 0;
281 asm volatile("lfpc %0" : : "Q" (vcpu->arch.guest_fpregs.fpc));
282 vcpu->arch.sie_block->gbea = 1;
285 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
287 atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH);
288 set_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests);
289 vcpu->arch.sie_block->ecb = 6;
290 vcpu->arch.sie_block->eca = 0xC1002001U;
291 vcpu->arch.sie_block->fac = (int) (long) facilities;
292 hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
293 tasklet_init(&vcpu->arch.tasklet, kvm_s390_tasklet,
294 (unsigned long) vcpu);
295 vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
296 get_cpu_id(&vcpu->arch.cpu_id);
297 vcpu->arch.cpu_id.version = 0xff;
301 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
304 struct kvm_vcpu *vcpu;
307 if (id >= KVM_MAX_VCPUS)
312 vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
316 vcpu->arch.sie_block = (struct kvm_s390_sie_block *)
317 get_zeroed_page(GFP_KERNEL);
319 if (!vcpu->arch.sie_block)
322 vcpu->arch.sie_block->icpua = id;
323 BUG_ON(!kvm->arch.sca);
324 if (!kvm->arch.sca->cpu[id].sda)
325 kvm->arch.sca->cpu[id].sda = (__u64) vcpu->arch.sie_block;
326 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)kvm->arch.sca) >> 32);
327 vcpu->arch.sie_block->scaol = (__u32)(__u64)kvm->arch.sca;
328 set_bit(63 - id, (unsigned long *) &kvm->arch.sca->mcn);
330 spin_lock_init(&vcpu->arch.local_int.lock);
331 INIT_LIST_HEAD(&vcpu->arch.local_int.list);
332 vcpu->arch.local_int.float_int = &kvm->arch.float_int;
333 spin_lock(&kvm->arch.float_int.lock);
334 kvm->arch.float_int.local_int[id] = &vcpu->arch.local_int;
335 init_waitqueue_head(&vcpu->arch.local_int.wq);
336 vcpu->arch.local_int.cpuflags = &vcpu->arch.sie_block->cpuflags;
337 spin_unlock(&kvm->arch.float_int.lock);
339 rc = kvm_vcpu_init(vcpu, kvm, id);
341 goto out_free_sie_block;
342 VM_EVENT(kvm, 3, "create cpu %d at %p, sie block at %p", id, vcpu,
343 vcpu->arch.sie_block);
347 free_page((unsigned long)(vcpu->arch.sie_block));
354 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
356 /* kvm common code refers to this, but never calls it */
361 static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
363 kvm_s390_vcpu_initial_reset(vcpu);
367 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
369 memcpy(&vcpu->arch.guest_gprs, ®s->gprs, sizeof(regs->gprs));
373 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
375 memcpy(®s->gprs, &vcpu->arch.guest_gprs, sizeof(regs->gprs));
379 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
380 struct kvm_sregs *sregs)
382 memcpy(&vcpu->arch.guest_acrs, &sregs->acrs, sizeof(sregs->acrs));
383 memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs));
387 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
388 struct kvm_sregs *sregs)
390 memcpy(&sregs->acrs, &vcpu->arch.guest_acrs, sizeof(sregs->acrs));
391 memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs));
395 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
397 memcpy(&vcpu->arch.guest_fpregs.fprs, &fpu->fprs, sizeof(fpu->fprs));
398 vcpu->arch.guest_fpregs.fpc = fpu->fpc;
402 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
404 memcpy(&fpu->fprs, &vcpu->arch.guest_fpregs.fprs, sizeof(fpu->fprs));
405 fpu->fpc = vcpu->arch.guest_fpregs.fpc;
409 static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)
413 if (atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_RUNNING)
416 vcpu->run->psw_mask = psw.mask;
417 vcpu->run->psw_addr = psw.addr;
422 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
423 struct kvm_translation *tr)
425 return -EINVAL; /* not implemented yet */
428 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
429 struct kvm_guest_debug *dbg)
431 return -EINVAL; /* not implemented yet */
434 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
435 struct kvm_mp_state *mp_state)
437 return -EINVAL; /* not implemented yet */
440 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
441 struct kvm_mp_state *mp_state)
443 return -EINVAL; /* not implemented yet */
446 static void __vcpu_run(struct kvm_vcpu *vcpu)
450 memcpy(&vcpu->arch.sie_block->gg14, &vcpu->arch.guest_gprs[14], 16);
455 if (test_thread_flag(TIF_MCCK_PENDING))
458 kvm_s390_deliver_pending_interrupts(vcpu);
460 VCPU_EVENT(vcpu, 6, "entering sie flags %x",
461 atomic_read(&vcpu->arch.sie_block->cpuflags));
463 vcpu->arch.sie_block->icptcode = 0;
467 rc = sie64a(vcpu->arch.sie_block, vcpu->arch.guest_gprs);
473 VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction");
474 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
476 VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
477 vcpu->arch.sie_block->icptcode);
479 memcpy(&vcpu->arch.guest_gprs[14], &vcpu->arch.sie_block->gg14, 16);
482 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
489 if (test_and_clear_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests))
490 kvm_s390_vcpu_set_mem(vcpu);
492 /* verify, that memory has been registered */
493 if (!vcpu->arch.sie_block->gmslm) {
495 VCPU_EVENT(vcpu, 3, "%s", "no memory registered to run vcpu");
499 if (vcpu->sigset_active)
500 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
502 atomic_set_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
504 BUG_ON(vcpu->kvm->arch.float_int.local_int[vcpu->vcpu_id] == NULL);
506 switch (kvm_run->exit_reason) {
507 case KVM_EXIT_S390_SIEIC:
508 case KVM_EXIT_UNKNOWN:
510 case KVM_EXIT_S390_RESET:
516 vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask;
517 vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr;
523 rc = kvm_handle_sie_intercept(vcpu);
524 } while (!signal_pending(current) && !rc);
526 if (rc == SIE_INTERCEPT_RERUNVCPU)
529 if (signal_pending(current) && !rc) {
530 kvm_run->exit_reason = KVM_EXIT_INTR;
534 if (rc == -EOPNOTSUPP) {
535 /* intercept cannot be handled in-kernel, prepare kvm-run */
536 kvm_run->exit_reason = KVM_EXIT_S390_SIEIC;
537 kvm_run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode;
538 kvm_run->s390_sieic.ipa = vcpu->arch.sie_block->ipa;
539 kvm_run->s390_sieic.ipb = vcpu->arch.sie_block->ipb;
543 if (rc == -EREMOTE) {
544 /* intercept was handled, but userspace support is needed
545 * kvm_run has been prepared by the handler */
549 kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask;
550 kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr;
552 if (vcpu->sigset_active)
553 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
555 vcpu->stat.exit_userspace++;
559 static int __guestcopy(struct kvm_vcpu *vcpu, u64 guestdest, const void *from,
560 unsigned long n, int prefix)
563 return copy_to_guest(vcpu, guestdest, from, n);
565 return copy_to_guest_absolute(vcpu, guestdest, from, n);
569 * store status at address
570 * we use have two special cases:
571 * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit
572 * KVM_S390_STORE_STATUS_PREFIXED: -> prefix
574 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
576 const unsigned char archmode = 1;
579 if (addr == KVM_S390_STORE_STATUS_NOADDR) {
580 if (copy_to_guest_absolute(vcpu, 163ul, &archmode, 1))
582 addr = SAVE_AREA_BASE;
584 } else if (addr == KVM_S390_STORE_STATUS_PREFIXED) {
585 if (copy_to_guest(vcpu, 163ul, &archmode, 1))
587 addr = SAVE_AREA_BASE;
593 * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy
594 * copying in vcpu load/put. Lets update our copies before we save
595 * it into the save area
597 save_fp_regs(&vcpu->arch.guest_fpregs);
598 save_access_regs(vcpu->arch.guest_acrs);
600 if (__guestcopy(vcpu, addr + offsetof(struct save_area, fp_regs),
601 vcpu->arch.guest_fpregs.fprs, 128, prefix))
604 if (__guestcopy(vcpu, addr + offsetof(struct save_area, gp_regs),
605 vcpu->arch.guest_gprs, 128, prefix))
608 if (__guestcopy(vcpu, addr + offsetof(struct save_area, psw),
609 &vcpu->arch.sie_block->gpsw, 16, prefix))
612 if (__guestcopy(vcpu, addr + offsetof(struct save_area, pref_reg),
613 &vcpu->arch.sie_block->prefix, 4, prefix))
616 if (__guestcopy(vcpu,
617 addr + offsetof(struct save_area, fp_ctrl_reg),
618 &vcpu->arch.guest_fpregs.fpc, 4, prefix))
621 if (__guestcopy(vcpu, addr + offsetof(struct save_area, tod_reg),
622 &vcpu->arch.sie_block->todpr, 4, prefix))
625 if (__guestcopy(vcpu, addr + offsetof(struct save_area, timer),
626 &vcpu->arch.sie_block->cputm, 8, prefix))
629 if (__guestcopy(vcpu, addr + offsetof(struct save_area, clk_cmp),
630 &vcpu->arch.sie_block->ckc, 8, prefix))
633 if (__guestcopy(vcpu, addr + offsetof(struct save_area, acc_regs),
634 &vcpu->arch.guest_acrs, 64, prefix))
637 if (__guestcopy(vcpu,
638 addr + offsetof(struct save_area, ctrl_regs),
639 &vcpu->arch.sie_block->gcr, 128, prefix))
644 long kvm_arch_vcpu_ioctl(struct file *filp,
645 unsigned int ioctl, unsigned long arg)
647 struct kvm_vcpu *vcpu = filp->private_data;
648 void __user *argp = (void __user *)arg;
652 case KVM_S390_INTERRUPT: {
653 struct kvm_s390_interrupt s390int;
656 if (copy_from_user(&s390int, argp, sizeof(s390int)))
658 r = kvm_s390_inject_vcpu(vcpu, &s390int);
661 case KVM_S390_STORE_STATUS:
662 r = kvm_s390_vcpu_store_status(vcpu, arg);
664 case KVM_S390_SET_INITIAL_PSW: {
668 if (copy_from_user(&psw, argp, sizeof(psw)))
670 r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw);
673 case KVM_S390_INITIAL_RESET:
674 r = kvm_arch_vcpu_ioctl_initial_reset(vcpu);
682 /* Section: memory related */
683 int kvm_arch_prepare_memory_region(struct kvm *kvm,
684 struct kvm_memory_slot *memslot,
685 struct kvm_memory_slot old,
686 struct kvm_userspace_memory_region *mem,
689 /* A few sanity checks. We can have exactly one memory slot which has
690 to start at guest virtual zero and which has to be located at a
691 page boundary in userland and which has to end at a page boundary.
692 The memory in userland is ok to be fragmented into various different
693 vmas. It is okay to mmap() and munmap() stuff in this slot after
694 doing this call at any time */
699 if (mem->guest_phys_addr)
702 if (mem->userspace_addr & (PAGE_SIZE - 1))
705 if (mem->memory_size & (PAGE_SIZE - 1))
714 void kvm_arch_commit_memory_region(struct kvm *kvm,
715 struct kvm_userspace_memory_region *mem,
716 struct kvm_memory_slot old,
720 struct kvm_vcpu *vcpu;
722 /* request update of sie control block for all available vcpus */
723 kvm_for_each_vcpu(i, vcpu, kvm) {
724 if (test_and_set_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests))
726 kvm_s390_inject_sigp_stop(vcpu, ACTION_RELOADVCPU_ON_STOP);
730 void kvm_arch_flush_shadow(struct kvm *kvm)
734 static int __init kvm_s390_init(void)
737 ret = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
742 * guests can ask for up to 255+1 double words, we need a full page
743 * to hold the maximum amount of facilities. On the other hand, we
744 * only set facilities that are known to work in KVM.
746 facilities = (unsigned long long *) get_zeroed_page(GFP_KERNEL|GFP_DMA);
751 memcpy(facilities, S390_lowcore.stfle_fac_list, 16);
752 facilities[0] &= 0xff00fff3f47c0000ULL;
753 facilities[1] &= 0x201c000000000000ULL;
757 static void __exit kvm_s390_exit(void)
759 free_page((unsigned long) facilities);
763 module_init(kvm_s390_init);
764 module_exit(kvm_s390_exit);