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b0c632db HC |
1 | /* |
2 | * s390host.c -- hosting zSeries kernel virtual machines | |
3 | * | |
4 | * Copyright IBM Corp. 2008 | |
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 | * Christian Borntraeger <borntraeger@de.ibm.com> | |
12 | * Heiko Carstens <heiko.carstens@de.ibm.com> | |
13 | */ | |
14 | ||
15 | #include <linux/compiler.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/fs.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/kvm.h> | |
20 | #include <linux/kvm_host.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/slab.h> | |
23 | #include <asm/lowcore.h> | |
24 | #include <asm/pgtable.h> | |
25 | ||
26 | #include "gaccess.h" | |
27 | ||
28 | #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU | |
29 | ||
30 | struct kvm_stats_debugfs_item debugfs_entries[] = { | |
31 | { "userspace_handled", VCPU_STAT(exit_userspace) }, | |
32 | { NULL } | |
33 | }; | |
34 | ||
35 | ||
36 | /* Section: not file related */ | |
37 | void kvm_arch_hardware_enable(void *garbage) | |
38 | { | |
39 | /* every s390 is virtualization enabled ;-) */ | |
40 | } | |
41 | ||
42 | void kvm_arch_hardware_disable(void *garbage) | |
43 | { | |
44 | } | |
45 | ||
46 | void decache_vcpus_on_cpu(int cpu) | |
47 | { | |
48 | } | |
49 | ||
50 | int kvm_arch_hardware_setup(void) | |
51 | { | |
52 | return 0; | |
53 | } | |
54 | ||
55 | void kvm_arch_hardware_unsetup(void) | |
56 | { | |
57 | } | |
58 | ||
59 | void kvm_arch_check_processor_compat(void *rtn) | |
60 | { | |
61 | } | |
62 | ||
63 | int kvm_arch_init(void *opaque) | |
64 | { | |
65 | return 0; | |
66 | } | |
67 | ||
68 | void kvm_arch_exit(void) | |
69 | { | |
70 | } | |
71 | ||
72 | /* Section: device related */ | |
73 | long kvm_arch_dev_ioctl(struct file *filp, | |
74 | unsigned int ioctl, unsigned long arg) | |
75 | { | |
76 | if (ioctl == KVM_S390_ENABLE_SIE) | |
77 | return s390_enable_sie(); | |
78 | return -EINVAL; | |
79 | } | |
80 | ||
81 | int kvm_dev_ioctl_check_extension(long ext) | |
82 | { | |
83 | return 0; | |
84 | } | |
85 | ||
86 | /* Section: vm related */ | |
87 | /* | |
88 | * Get (and clear) the dirty memory log for a memory slot. | |
89 | */ | |
90 | int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, | |
91 | struct kvm_dirty_log *log) | |
92 | { | |
93 | return 0; | |
94 | } | |
95 | ||
96 | long kvm_arch_vm_ioctl(struct file *filp, | |
97 | unsigned int ioctl, unsigned long arg) | |
98 | { | |
99 | struct kvm *kvm = filp->private_data; | |
100 | void __user *argp = (void __user *)arg; | |
101 | int r; | |
102 | ||
103 | switch (ioctl) { | |
104 | default: | |
105 | r = -EINVAL; | |
106 | } | |
107 | ||
108 | return r; | |
109 | } | |
110 | ||
111 | struct kvm *kvm_arch_create_vm(void) | |
112 | { | |
113 | struct kvm *kvm; | |
114 | int rc; | |
115 | char debug_name[16]; | |
116 | ||
117 | rc = s390_enable_sie(); | |
118 | if (rc) | |
119 | goto out_nokvm; | |
120 | ||
121 | rc = -ENOMEM; | |
122 | kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL); | |
123 | if (!kvm) | |
124 | goto out_nokvm; | |
125 | ||
126 | kvm->arch.sca = (struct sca_block *) get_zeroed_page(GFP_KERNEL); | |
127 | if (!kvm->arch.sca) | |
128 | goto out_nosca; | |
129 | ||
130 | sprintf(debug_name, "kvm-%u", current->pid); | |
131 | ||
132 | kvm->arch.dbf = debug_register(debug_name, 8, 2, 8 * sizeof(long)); | |
133 | if (!kvm->arch.dbf) | |
134 | goto out_nodbf; | |
135 | ||
136 | debug_register_view(kvm->arch.dbf, &debug_sprintf_view); | |
137 | VM_EVENT(kvm, 3, "%s", "vm created"); | |
138 | ||
139 | try_module_get(THIS_MODULE); | |
140 | ||
141 | return kvm; | |
142 | out_nodbf: | |
143 | free_page((unsigned long)(kvm->arch.sca)); | |
144 | out_nosca: | |
145 | kfree(kvm); | |
146 | out_nokvm: | |
147 | return ERR_PTR(rc); | |
148 | } | |
149 | ||
150 | void kvm_arch_destroy_vm(struct kvm *kvm) | |
151 | { | |
152 | debug_unregister(kvm->arch.dbf); | |
153 | free_page((unsigned long)(kvm->arch.sca)); | |
154 | kfree(kvm); | |
155 | module_put(THIS_MODULE); | |
156 | } | |
157 | ||
158 | /* Section: vcpu related */ | |
159 | int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) | |
160 | { | |
161 | return 0; | |
162 | } | |
163 | ||
164 | void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) | |
165 | { | |
166 | /* kvm common code refers to this, but does'nt call it */ | |
167 | BUG(); | |
168 | } | |
169 | ||
170 | void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) | |
171 | { | |
172 | save_fp_regs(&vcpu->arch.host_fpregs); | |
173 | save_access_regs(vcpu->arch.host_acrs); | |
174 | vcpu->arch.guest_fpregs.fpc &= FPC_VALID_MASK; | |
175 | restore_fp_regs(&vcpu->arch.guest_fpregs); | |
176 | restore_access_regs(vcpu->arch.guest_acrs); | |
177 | ||
178 | if (signal_pending(current)) | |
179 | atomic_set_mask(CPUSTAT_STOP_INT, | |
180 | &vcpu->arch.sie_block->cpuflags); | |
181 | } | |
182 | ||
183 | void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) | |
184 | { | |
185 | save_fp_regs(&vcpu->arch.guest_fpregs); | |
186 | save_access_regs(vcpu->arch.guest_acrs); | |
187 | restore_fp_regs(&vcpu->arch.host_fpregs); | |
188 | restore_access_regs(vcpu->arch.host_acrs); | |
189 | } | |
190 | ||
191 | static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu) | |
192 | { | |
193 | /* this equals initial cpu reset in pop, but we don't switch to ESA */ | |
194 | vcpu->arch.sie_block->gpsw.mask = 0UL; | |
195 | vcpu->arch.sie_block->gpsw.addr = 0UL; | |
196 | vcpu->arch.sie_block->prefix = 0UL; | |
197 | vcpu->arch.sie_block->ihcpu = 0xffff; | |
198 | vcpu->arch.sie_block->cputm = 0UL; | |
199 | vcpu->arch.sie_block->ckc = 0UL; | |
200 | vcpu->arch.sie_block->todpr = 0; | |
201 | memset(vcpu->arch.sie_block->gcr, 0, 16 * sizeof(__u64)); | |
202 | vcpu->arch.sie_block->gcr[0] = 0xE0UL; | |
203 | vcpu->arch.sie_block->gcr[14] = 0xC2000000UL; | |
204 | vcpu->arch.guest_fpregs.fpc = 0; | |
205 | asm volatile("lfpc %0" : : "Q" (vcpu->arch.guest_fpregs.fpc)); | |
206 | vcpu->arch.sie_block->gbea = 1; | |
207 | } | |
208 | ||
209 | int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) | |
210 | { | |
211 | atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH); | |
212 | vcpu->arch.sie_block->gmslm = 0xffffffffffUL; | |
213 | vcpu->arch.sie_block->gmsor = 0x000000000000; | |
214 | vcpu->arch.sie_block->ecb = 2; | |
215 | vcpu->arch.sie_block->eca = 0xC1002001U; | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
220 | struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, | |
221 | unsigned int id) | |
222 | { | |
223 | struct kvm_vcpu *vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL); | |
224 | int rc = -ENOMEM; | |
225 | ||
226 | if (!vcpu) | |
227 | goto out_nomem; | |
228 | ||
229 | vcpu->arch.sie_block = (struct sie_block *) get_zeroed_page(GFP_KERNEL); | |
230 | ||
231 | if (!vcpu->arch.sie_block) | |
232 | goto out_free_cpu; | |
233 | ||
234 | vcpu->arch.sie_block->icpua = id; | |
235 | BUG_ON(!kvm->arch.sca); | |
236 | BUG_ON(kvm->arch.sca->cpu[id].sda); | |
237 | kvm->arch.sca->cpu[id].sda = (__u64) vcpu->arch.sie_block; | |
238 | vcpu->arch.sie_block->scaoh = (__u32)(((__u64)kvm->arch.sca) >> 32); | |
239 | vcpu->arch.sie_block->scaol = (__u32)(__u64)kvm->arch.sca; | |
240 | ||
241 | rc = kvm_vcpu_init(vcpu, kvm, id); | |
242 | if (rc) | |
243 | goto out_free_cpu; | |
244 | VM_EVENT(kvm, 3, "create cpu %d at %p, sie block at %p", id, vcpu, | |
245 | vcpu->arch.sie_block); | |
246 | ||
247 | try_module_get(THIS_MODULE); | |
248 | ||
249 | return vcpu; | |
250 | out_free_cpu: | |
251 | kfree(vcpu); | |
252 | out_nomem: | |
253 | return ERR_PTR(rc); | |
254 | } | |
255 | ||
256 | void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) | |
257 | { | |
258 | VCPU_EVENT(vcpu, 3, "%s", "destroy cpu"); | |
259 | free_page((unsigned long)(vcpu->arch.sie_block)); | |
260 | kfree(vcpu); | |
261 | module_put(THIS_MODULE); | |
262 | } | |
263 | ||
264 | int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) | |
265 | { | |
266 | /* kvm common code refers to this, but never calls it */ | |
267 | BUG(); | |
268 | return 0; | |
269 | } | |
270 | ||
271 | static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu) | |
272 | { | |
273 | vcpu_load(vcpu); | |
274 | kvm_s390_vcpu_initial_reset(vcpu); | |
275 | vcpu_put(vcpu); | |
276 | return 0; | |
277 | } | |
278 | ||
279 | int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) | |
280 | { | |
281 | vcpu_load(vcpu); | |
282 | memcpy(&vcpu->arch.guest_gprs, ®s->gprs, sizeof(regs->gprs)); | |
283 | vcpu_put(vcpu); | |
284 | return 0; | |
285 | } | |
286 | ||
287 | int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) | |
288 | { | |
289 | vcpu_load(vcpu); | |
290 | memcpy(®s->gprs, &vcpu->arch.guest_gprs, sizeof(regs->gprs)); | |
291 | vcpu_put(vcpu); | |
292 | return 0; | |
293 | } | |
294 | ||
295 | int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, | |
296 | struct kvm_sregs *sregs) | |
297 | { | |
298 | vcpu_load(vcpu); | |
299 | memcpy(&vcpu->arch.guest_acrs, &sregs->acrs, sizeof(sregs->acrs)); | |
300 | memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs)); | |
301 | vcpu_put(vcpu); | |
302 | return 0; | |
303 | } | |
304 | ||
305 | int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, | |
306 | struct kvm_sregs *sregs) | |
307 | { | |
308 | vcpu_load(vcpu); | |
309 | memcpy(&sregs->acrs, &vcpu->arch.guest_acrs, sizeof(sregs->acrs)); | |
310 | memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs)); | |
311 | vcpu_put(vcpu); | |
312 | return 0; | |
313 | } | |
314 | ||
315 | int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) | |
316 | { | |
317 | vcpu_load(vcpu); | |
318 | memcpy(&vcpu->arch.guest_fpregs.fprs, &fpu->fprs, sizeof(fpu->fprs)); | |
319 | vcpu->arch.guest_fpregs.fpc = fpu->fpc; | |
320 | vcpu_put(vcpu); | |
321 | return 0; | |
322 | } | |
323 | ||
324 | int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) | |
325 | { | |
326 | vcpu_load(vcpu); | |
327 | memcpy(&fpu->fprs, &vcpu->arch.guest_fpregs.fprs, sizeof(fpu->fprs)); | |
328 | fpu->fpc = vcpu->arch.guest_fpregs.fpc; | |
329 | vcpu_put(vcpu); | |
330 | return 0; | |
331 | } | |
332 | ||
333 | static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw) | |
334 | { | |
335 | int rc = 0; | |
336 | ||
337 | vcpu_load(vcpu); | |
338 | if (atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_RUNNING) | |
339 | rc = -EBUSY; | |
340 | else | |
341 | vcpu->arch.sie_block->gpsw = psw; | |
342 | vcpu_put(vcpu); | |
343 | return rc; | |
344 | } | |
345 | ||
346 | int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, | |
347 | struct kvm_translation *tr) | |
348 | { | |
349 | return -EINVAL; /* not implemented yet */ | |
350 | } | |
351 | ||
352 | int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu, | |
353 | struct kvm_debug_guest *dbg) | |
354 | { | |
355 | return -EINVAL; /* not implemented yet */ | |
356 | } | |
357 | ||
358 | static void __vcpu_run(struct kvm_vcpu *vcpu) | |
359 | { | |
360 | memcpy(&vcpu->arch.sie_block->gg14, &vcpu->arch.guest_gprs[14], 16); | |
361 | ||
362 | if (need_resched()) | |
363 | schedule(); | |
364 | ||
365 | vcpu->arch.sie_block->icptcode = 0; | |
366 | local_irq_disable(); | |
367 | kvm_guest_enter(); | |
368 | local_irq_enable(); | |
369 | VCPU_EVENT(vcpu, 6, "entering sie flags %x", | |
370 | atomic_read(&vcpu->arch.sie_block->cpuflags)); | |
371 | sie64a(vcpu->arch.sie_block, vcpu->arch.guest_gprs); | |
372 | VCPU_EVENT(vcpu, 6, "exit sie icptcode %d", | |
373 | vcpu->arch.sie_block->icptcode); | |
374 | local_irq_disable(); | |
375 | kvm_guest_exit(); | |
376 | local_irq_enable(); | |
377 | ||
378 | memcpy(&vcpu->arch.guest_gprs[14], &vcpu->arch.sie_block->gg14, 16); | |
379 | } | |
380 | ||
381 | int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) | |
382 | { | |
383 | sigset_t sigsaved; | |
384 | ||
385 | vcpu_load(vcpu); | |
386 | ||
387 | if (vcpu->sigset_active) | |
388 | sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); | |
389 | ||
390 | atomic_set_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags); | |
391 | ||
392 | __vcpu_run(vcpu); | |
393 | ||
394 | if (vcpu->sigset_active) | |
395 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); | |
396 | ||
397 | vcpu_put(vcpu); | |
398 | ||
399 | vcpu->stat.exit_userspace++; | |
400 | return 0; | |
401 | } | |
402 | ||
403 | static int __guestcopy(struct kvm_vcpu *vcpu, u64 guestdest, const void *from, | |
404 | unsigned long n, int prefix) | |
405 | { | |
406 | if (prefix) | |
407 | return copy_to_guest(vcpu, guestdest, from, n); | |
408 | else | |
409 | return copy_to_guest_absolute(vcpu, guestdest, from, n); | |
410 | } | |
411 | ||
412 | /* | |
413 | * store status at address | |
414 | * we use have two special cases: | |
415 | * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit | |
416 | * KVM_S390_STORE_STATUS_PREFIXED: -> prefix | |
417 | */ | |
418 | int __kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr) | |
419 | { | |
420 | const unsigned char archmode = 1; | |
421 | int prefix; | |
422 | ||
423 | if (addr == KVM_S390_STORE_STATUS_NOADDR) { | |
424 | if (copy_to_guest_absolute(vcpu, 163ul, &archmode, 1)) | |
425 | return -EFAULT; | |
426 | addr = SAVE_AREA_BASE; | |
427 | prefix = 0; | |
428 | } else if (addr == KVM_S390_STORE_STATUS_PREFIXED) { | |
429 | if (copy_to_guest(vcpu, 163ul, &archmode, 1)) | |
430 | return -EFAULT; | |
431 | addr = SAVE_AREA_BASE; | |
432 | prefix = 1; | |
433 | } else | |
434 | prefix = 0; | |
435 | ||
436 | if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, fp_regs), | |
437 | vcpu->arch.guest_fpregs.fprs, 128, prefix)) | |
438 | return -EFAULT; | |
439 | ||
440 | if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, gp_regs), | |
441 | vcpu->arch.guest_gprs, 128, prefix)) | |
442 | return -EFAULT; | |
443 | ||
444 | if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, psw), | |
445 | &vcpu->arch.sie_block->gpsw, 16, prefix)) | |
446 | return -EFAULT; | |
447 | ||
448 | if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, pref_reg), | |
449 | &vcpu->arch.sie_block->prefix, 4, prefix)) | |
450 | return -EFAULT; | |
451 | ||
452 | if (__guestcopy(vcpu, | |
453 | addr + offsetof(struct save_area_s390x, fp_ctrl_reg), | |
454 | &vcpu->arch.guest_fpregs.fpc, 4, prefix)) | |
455 | return -EFAULT; | |
456 | ||
457 | if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, tod_reg), | |
458 | &vcpu->arch.sie_block->todpr, 4, prefix)) | |
459 | return -EFAULT; | |
460 | ||
461 | if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, timer), | |
462 | &vcpu->arch.sie_block->cputm, 8, prefix)) | |
463 | return -EFAULT; | |
464 | ||
465 | if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, clk_cmp), | |
466 | &vcpu->arch.sie_block->ckc, 8, prefix)) | |
467 | return -EFAULT; | |
468 | ||
469 | if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, acc_regs), | |
470 | &vcpu->arch.guest_acrs, 64, prefix)) | |
471 | return -EFAULT; | |
472 | ||
473 | if (__guestcopy(vcpu, | |
474 | addr + offsetof(struct save_area_s390x, ctrl_regs), | |
475 | &vcpu->arch.sie_block->gcr, 128, prefix)) | |
476 | return -EFAULT; | |
477 | return 0; | |
478 | } | |
479 | ||
480 | static int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr) | |
481 | { | |
482 | int rc; | |
483 | ||
484 | vcpu_load(vcpu); | |
485 | rc = __kvm_s390_vcpu_store_status(vcpu, addr); | |
486 | vcpu_put(vcpu); | |
487 | return rc; | |
488 | } | |
489 | ||
490 | long kvm_arch_vcpu_ioctl(struct file *filp, | |
491 | unsigned int ioctl, unsigned long arg) | |
492 | { | |
493 | struct kvm_vcpu *vcpu = filp->private_data; | |
494 | void __user *argp = (void __user *)arg; | |
495 | ||
496 | switch (ioctl) { | |
497 | case KVM_S390_STORE_STATUS: | |
498 | return kvm_s390_vcpu_store_status(vcpu, arg); | |
499 | case KVM_S390_SET_INITIAL_PSW: { | |
500 | psw_t psw; | |
501 | ||
502 | if (copy_from_user(&psw, argp, sizeof(psw))) | |
503 | return -EFAULT; | |
504 | return kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw); | |
505 | } | |
506 | case KVM_S390_INITIAL_RESET: | |
507 | return kvm_arch_vcpu_ioctl_initial_reset(vcpu); | |
508 | default: | |
509 | ; | |
510 | } | |
511 | return -EINVAL; | |
512 | } | |
513 | ||
514 | /* Section: memory related */ | |
515 | int kvm_arch_set_memory_region(struct kvm *kvm, | |
516 | struct kvm_userspace_memory_region *mem, | |
517 | struct kvm_memory_slot old, | |
518 | int user_alloc) | |
519 | { | |
520 | /* A few sanity checks. We can have exactly one memory slot which has | |
521 | to start at guest virtual zero and which has to be located at a | |
522 | page boundary in userland and which has to end at a page boundary. | |
523 | The memory in userland is ok to be fragmented into various different | |
524 | vmas. It is okay to mmap() and munmap() stuff in this slot after | |
525 | doing this call at any time */ | |
526 | ||
527 | if (mem->slot) | |
528 | return -EINVAL; | |
529 | ||
530 | if (mem->guest_phys_addr) | |
531 | return -EINVAL; | |
532 | ||
533 | if (mem->userspace_addr & (PAGE_SIZE - 1)) | |
534 | return -EINVAL; | |
535 | ||
536 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
537 | return -EINVAL; | |
538 | ||
539 | kvm->arch.guest_origin = mem->userspace_addr; | |
540 | kvm->arch.guest_memsize = mem->memory_size; | |
541 | ||
542 | /* FIXME: we do want to interrupt running CPUs and update their memory | |
543 | configuration now to avoid race conditions. But hey, changing the | |
544 | memory layout while virtual CPUs are running is usually bad | |
545 | programming practice. */ | |
546 | ||
547 | return 0; | |
548 | } | |
549 | ||
550 | gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn) | |
551 | { | |
552 | return gfn; | |
553 | } | |
554 | ||
555 | static int __init kvm_s390_init(void) | |
556 | { | |
557 | return kvm_init(NULL, sizeof(struct kvm_vcpu), THIS_MODULE); | |
558 | } | |
559 | ||
560 | static void __exit kvm_s390_exit(void) | |
561 | { | |
562 | kvm_exit(); | |
563 | } | |
564 | ||
565 | module_init(kvm_s390_init); | |
566 | module_exit(kvm_s390_exit); |