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[TCP]: TCP_CONG_YEAH requires TCP_CONG_VEGAS
[linux-2.6/verdex.git] / drivers / kvm / kvm_main.c
blob0d892600ff00f91f48301a871712cbe8e51bb730
1 /*
2 * Kernel-based Virtual Machine driver for Linux
3 *
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
6 *
7 * Copyright (C) 2006 Qumranet, Inc.
8 *
9 * Authors:
10 * Avi Kivity <avi@qumranet.com>
11 * Yaniv Kamay <yaniv@qumranet.com>
12 *
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
15 *
16 */
17
18 #include "kvm.h"
19
20 #include <linux/kvm.h>
21 #include <linux/module.h>
22 #include <linux/errno.h>
23 #include <linux/magic.h>
24 #include <asm/processor.h>
25 #include <linux/percpu.h>
26 #include <linux/gfp.h>
27 #include <asm/msr.h>
28 #include <linux/mm.h>
29 #include <linux/miscdevice.h>
30 #include <linux/vmalloc.h>
31 #include <asm/uaccess.h>
32 #include <linux/reboot.h>
33 #include <asm/io.h>
34 #include <linux/debugfs.h>
35 #include <linux/highmem.h>
36 #include <linux/file.h>
37 #include <asm/desc.h>
38 #include <linux/sysdev.h>
39 #include <linux/cpu.h>
40 #include <linux/file.h>
41 #include <linux/fs.h>
42 #include <linux/mount.h>
43
44 #include "x86_emulate.h"
45 #include "segment_descriptor.h"
46
47 MODULE_AUTHOR("Qumranet");
48 MODULE_LICENSE("GPL");
49
50 static DEFINE_SPINLOCK(kvm_lock);
51 static LIST_HEAD(vm_list);
52
53 struct kvm_arch_ops *kvm_arch_ops;
54
55 #define STAT_OFFSET(x) offsetof(struct kvm_vcpu, stat.x)
56
57 static struct kvm_stats_debugfs_item {
58 const char *name;
59 int offset;
60 struct dentry *dentry;
61 } debugfs_entries[] = {
62 { "pf_fixed", STAT_OFFSET(pf_fixed) },
63 { "pf_guest", STAT_OFFSET(pf_guest) },
64 { "tlb_flush", STAT_OFFSET(tlb_flush) },
65 { "invlpg", STAT_OFFSET(invlpg) },
66 { "exits", STAT_OFFSET(exits) },
67 { "io_exits", STAT_OFFSET(io_exits) },
68 { "mmio_exits", STAT_OFFSET(mmio_exits) },
69 { "signal_exits", STAT_OFFSET(signal_exits) },
70 { "irq_window", STAT_OFFSET(irq_window_exits) },
71 { "halt_exits", STAT_OFFSET(halt_exits) },
72 { "request_irq", STAT_OFFSET(request_irq_exits) },
73 { "irq_exits", STAT_OFFSET(irq_exits) },
74 { NULL }
75 };
76
77 static struct dentry *debugfs_dir;
78
79 struct vfsmount *kvmfs_mnt;
80
81 #define MAX_IO_MSRS 256
82
83 #define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL
84 #define LMSW_GUEST_MASK 0x0eULL
85 #define CR4_RESEVED_BITS (~((1ULL << 11) - 1))
86 #define CR8_RESEVED_BITS (~0x0fULL)
87 #define EFER_RESERVED_BITS 0xfffffffffffff2fe
88
89 #ifdef CONFIG_X86_64
90 // LDT or TSS descriptor in the GDT. 16 bytes.
91 struct segment_descriptor_64 {
92 struct segment_descriptor s;
93 u32 base_higher;
94 u32 pad_zero;
95 };
96
97 #endif
98
99 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
100 unsigned long arg);
101
102 static struct inode *kvmfs_inode(struct file_operations *fops)
103 {
104 int error = -ENOMEM;
105 struct inode *inode = new_inode(kvmfs_mnt->mnt_sb);
106
107 if (!inode)
108 goto eexit_1;
109
110 inode->i_fop = fops;
111
112 /*
113 * Mark the inode dirty from the very beginning,
114 * that way it will never be moved to the dirty
115 * list because mark_inode_dirty() will think
116 * that it already _is_ on the dirty list.
117 */
118 inode->i_state = I_DIRTY;
119 inode->i_mode = S_IRUSR | S_IWUSR;
120 inode->i_uid = current->fsuid;
121 inode->i_gid = current->fsgid;
122 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
123 return inode;
124
125 eexit_1:
126 return ERR_PTR(error);
127 }
128
129 static struct file *kvmfs_file(struct inode *inode, void *private_data)
130 {
131 struct file *file = get_empty_filp();
132
133 if (!file)
134 return ERR_PTR(-ENFILE);
135
136 file->f_path.mnt = mntget(kvmfs_mnt);
137 file->f_path.dentry = d_alloc_anon(inode);
138 if (!file->f_path.dentry)
139 return ERR_PTR(-ENOMEM);
140 file->f_mapping = inode->i_mapping;
141
142 file->f_pos = 0;
143 file->f_flags = O_RDWR;
144 file->f_op = inode->i_fop;
145 file->f_mode = FMODE_READ | FMODE_WRITE;
146 file->f_version = 0;
147 file->private_data = private_data;
148 return file;
149 }
150
151 unsigned long segment_base(u16 selector)
152 {
153 struct descriptor_table gdt;
154 struct segment_descriptor *d;
155 unsigned long table_base;
156 typedef unsigned long ul;
157 unsigned long v;
158
159 if (selector == 0)
160 return 0;
161
162 asm ("sgdt %0" : "=m"(gdt));
163 table_base = gdt.base;
164
165 if (selector & 4) { /* from ldt */
166 u16 ldt_selector;
167
168 asm ("sldt %0" : "=g"(ldt_selector));
169 table_base = segment_base(ldt_selector);
170 }
171 d = (struct segment_descriptor *)(table_base + (selector & ~7));
172 v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
173 #ifdef CONFIG_X86_64
174 if (d->system == 0
175 && (d->type == 2 || d->type == 9 || d->type == 11))
176 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
177 #endif
178 return v;
179 }
180 EXPORT_SYMBOL_GPL(segment_base);
181
182 static inline int valid_vcpu(int n)
183 {
184 return likely(n >= 0 && n < KVM_MAX_VCPUS);
185 }
186
187 int kvm_read_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
188 void *dest)
189 {
190 unsigned char *host_buf = dest;
191 unsigned long req_size = size;
192
193 while (size) {
194 hpa_t paddr;
195 unsigned now;
196 unsigned offset;
197 hva_t guest_buf;
198
199 paddr = gva_to_hpa(vcpu, addr);
200
201 if (is_error_hpa(paddr))
202 break;
203
204 guest_buf = (hva_t)kmap_atomic(
205 pfn_to_page(paddr >> PAGE_SHIFT),
206 KM_USER0);
207 offset = addr & ~PAGE_MASK;
208 guest_buf |= offset;
209 now = min(size, PAGE_SIZE - offset);
210 memcpy(host_buf, (void*)guest_buf, now);
211 host_buf += now;
212 addr += now;
213 size -= now;
214 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
215 }
216 return req_size - size;
217 }
218 EXPORT_SYMBOL_GPL(kvm_read_guest);
219
220 int kvm_write_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
221 void *data)
222 {
223 unsigned char *host_buf = data;
224 unsigned long req_size = size;
225
226 while (size) {
227 hpa_t paddr;
228 unsigned now;
229 unsigned offset;
230 hva_t guest_buf;
231 gfn_t gfn;
232
233 paddr = gva_to_hpa(vcpu, addr);
234
235 if (is_error_hpa(paddr))
236 break;
237
238 gfn = vcpu->mmu.gva_to_gpa(vcpu, addr) >> PAGE_SHIFT;
239 mark_page_dirty(vcpu->kvm, gfn);
240 guest_buf = (hva_t)kmap_atomic(
241 pfn_to_page(paddr >> PAGE_SHIFT), KM_USER0);
242 offset = addr & ~PAGE_MASK;
243 guest_buf |= offset;
244 now = min(size, PAGE_SIZE - offset);
245 memcpy((void*)guest_buf, host_buf, now);
246 host_buf += now;
247 addr += now;
248 size -= now;
249 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
250 }
251 return req_size - size;
252 }
253 EXPORT_SYMBOL_GPL(kvm_write_guest);
254
255 /*
256 * Switches to specified vcpu, until a matching vcpu_put()
257 */
258 static void vcpu_load(struct kvm_vcpu *vcpu)
259 {
260 mutex_lock(&vcpu->mutex);
261 kvm_arch_ops->vcpu_load(vcpu);
262 }
263
264 /*
265 * Switches to specified vcpu, until a matching vcpu_put(). Will return NULL
266 * if the slot is not populated.
267 */
268 static struct kvm_vcpu *vcpu_load_slot(struct kvm *kvm, int slot)
269 {
270 struct kvm_vcpu *vcpu = &kvm->vcpus[slot];
271
272 mutex_lock(&vcpu->mutex);
273 if (!vcpu->vmcs) {
274 mutex_unlock(&vcpu->mutex);
275 return NULL;
276 }
277 kvm_arch_ops->vcpu_load(vcpu);
278 return vcpu;
279 }
280
281 static void vcpu_put(struct kvm_vcpu *vcpu)
282 {
283 kvm_arch_ops->vcpu_put(vcpu);
284 mutex_unlock(&vcpu->mutex);
285 }
286
287 static struct kvm *kvm_create_vm(void)
288 {
289 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
290 int i;
291
292 if (!kvm)
293 return ERR_PTR(-ENOMEM);
294
295 spin_lock_init(&kvm->lock);
296 INIT_LIST_HEAD(&kvm->active_mmu_pages);
297 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
298 struct kvm_vcpu *vcpu = &kvm->vcpus[i];
299
300 mutex_init(&vcpu->mutex);
301 vcpu->cpu = -1;
302 vcpu->kvm = kvm;
303 vcpu->mmu.root_hpa = INVALID_PAGE;
304 INIT_LIST_HEAD(&vcpu->free_pages);
305 spin_lock(&kvm_lock);
306 list_add(&kvm->vm_list, &vm_list);
307 spin_unlock(&kvm_lock);
308 }
309 return kvm;
310 }
311
312 static int kvm_dev_open(struct inode *inode, struct file *filp)
313 {
314 return 0;
315 }
316
317 /*
318 * Free any memory in @free but not in @dont.
319 */
320 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
321 struct kvm_memory_slot *dont)
322 {
323 int i;
324
325 if (!dont || free->phys_mem != dont->phys_mem)
326 if (free->phys_mem) {
327 for (i = 0; i < free->npages; ++i)
328 if (free->phys_mem[i])
329 __free_page(free->phys_mem[i]);
330 vfree(free->phys_mem);
331 }
332
333 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
334 vfree(free->dirty_bitmap);
335
336 free->phys_mem = NULL;
337 free->npages = 0;
338 free->dirty_bitmap = NULL;
339 }
340
341 static void kvm_free_physmem(struct kvm *kvm)
342 {
343 int i;
344
345 for (i = 0; i < kvm->nmemslots; ++i)
346 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
347 }
348
349 static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
350 {
351 int i;
352
353 for (i = 0; i < 2; ++i)
354 if (vcpu->pio.guest_pages[i]) {
355 __free_page(vcpu->pio.guest_pages[i]);
356 vcpu->pio.guest_pages[i] = NULL;
357 }
358 }
359
360 static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
361 {
362 if (!vcpu->vmcs)
363 return;
364
365 vcpu_load(vcpu);
366 kvm_mmu_destroy(vcpu);
367 vcpu_put(vcpu);
368 kvm_arch_ops->vcpu_free(vcpu);
369 free_page((unsigned long)vcpu->run);
370 vcpu->run = NULL;
371 free_page((unsigned long)vcpu->pio_data);
372 vcpu->pio_data = NULL;
373 free_pio_guest_pages(vcpu);
374 }
375
376 static void kvm_free_vcpus(struct kvm *kvm)
377 {
378 unsigned int i;
379
380 for (i = 0; i < KVM_MAX_VCPUS; ++i)
381 kvm_free_vcpu(&kvm->vcpus[i]);
382 }
383
384 static int kvm_dev_release(struct inode *inode, struct file *filp)
385 {
386 return 0;
387 }
388
389 static void kvm_destroy_vm(struct kvm *kvm)
390 {
391 spin_lock(&kvm_lock);
392 list_del(&kvm->vm_list);
393 spin_unlock(&kvm_lock);
394 kvm_free_vcpus(kvm);
395 kvm_free_physmem(kvm);
396 kfree(kvm);
397 }
398
399 static int kvm_vm_release(struct inode *inode, struct file *filp)
400 {
401 struct kvm *kvm = filp->private_data;
402
403 kvm_destroy_vm(kvm);
404 return 0;
405 }
406
407 static void inject_gp(struct kvm_vcpu *vcpu)
408 {
409 kvm_arch_ops->inject_gp(vcpu, 0);
410 }
411
412 /*
413 * Load the pae pdptrs. Return true is they are all valid.
414 */
415 static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
416 {
417 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
418 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
419 int i;
420 u64 pdpte;
421 u64 *pdpt;
422 int ret;
423 struct page *page;
424
425 spin_lock(&vcpu->kvm->lock);
426 page = gfn_to_page(vcpu->kvm, pdpt_gfn);
427 /* FIXME: !page - emulate? 0xff? */
428 pdpt = kmap_atomic(page, KM_USER0);
429
430 ret = 1;
431 for (i = 0; i < 4; ++i) {
432 pdpte = pdpt[offset + i];
433 if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) {
434 ret = 0;
435 goto out;
436 }
437 }
438
439 for (i = 0; i < 4; ++i)
440 vcpu->pdptrs[i] = pdpt[offset + i];
441
442 out:
443 kunmap_atomic(pdpt, KM_USER0);
444 spin_unlock(&vcpu->kvm->lock);
445
446 return ret;
447 }
448
449 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
450 {
451 if (cr0 & CR0_RESEVED_BITS) {
452 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
453 cr0, vcpu->cr0);
454 inject_gp(vcpu);
455 return;
456 }
457
458 if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
459 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
460 inject_gp(vcpu);
461 return;
462 }
463
464 if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
465 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
466 "and a clear PE flag\n");
467 inject_gp(vcpu);
468 return;
469 }
470
471 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
472 #ifdef CONFIG_X86_64
473 if ((vcpu->shadow_efer & EFER_LME)) {
474 int cs_db, cs_l;
475
476 if (!is_pae(vcpu)) {
477 printk(KERN_DEBUG "set_cr0: #GP, start paging "
478 "in long mode while PAE is disabled\n");
479 inject_gp(vcpu);
480 return;
481 }
482 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
483 if (cs_l) {
484 printk(KERN_DEBUG "set_cr0: #GP, start paging "
485 "in long mode while CS.L == 1\n");
486 inject_gp(vcpu);
487 return;
488
489 }
490 } else
491 #endif
492 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
493 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
494 "reserved bits\n");
495 inject_gp(vcpu);
496 return;
497 }
498
499 }
500
501 kvm_arch_ops->set_cr0(vcpu, cr0);
502 vcpu->cr0 = cr0;
503
504 spin_lock(&vcpu->kvm->lock);
505 kvm_mmu_reset_context(vcpu);
506 spin_unlock(&vcpu->kvm->lock);
507 return;
508 }
509 EXPORT_SYMBOL_GPL(set_cr0);
510
511 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
512 {
513 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
514 }
515 EXPORT_SYMBOL_GPL(lmsw);
516
517 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
518 {
519 if (cr4 & CR4_RESEVED_BITS) {
520 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
521 inject_gp(vcpu);
522 return;
523 }
524
525 if (is_long_mode(vcpu)) {
526 if (!(cr4 & CR4_PAE_MASK)) {
527 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
528 "in long mode\n");
529 inject_gp(vcpu);
530 return;
531 }
532 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
533 && !load_pdptrs(vcpu, vcpu->cr3)) {
534 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
535 inject_gp(vcpu);
536 }
537
538 if (cr4 & CR4_VMXE_MASK) {
539 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
540 inject_gp(vcpu);
541 return;
542 }
543 kvm_arch_ops->set_cr4(vcpu, cr4);
544 spin_lock(&vcpu->kvm->lock);
545 kvm_mmu_reset_context(vcpu);
546 spin_unlock(&vcpu->kvm->lock);
547 }
548 EXPORT_SYMBOL_GPL(set_cr4);
549
550 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
551 {
552 if (is_long_mode(vcpu)) {
553 if (cr3 & CR3_L_MODE_RESEVED_BITS) {
554 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
555 inject_gp(vcpu);
556 return;
557 }
558 } else {
559 if (cr3 & CR3_RESEVED_BITS) {
560 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
561 inject_gp(vcpu);
562 return;
563 }
564 if (is_paging(vcpu) && is_pae(vcpu) &&
565 !load_pdptrs(vcpu, cr3)) {
566 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
567 "reserved bits\n");
568 inject_gp(vcpu);
569 return;
570 }
571 }
572
573 vcpu->cr3 = cr3;
574 spin_lock(&vcpu->kvm->lock);
575 /*
576 * Does the new cr3 value map to physical memory? (Note, we
577 * catch an invalid cr3 even in real-mode, because it would
578 * cause trouble later on when we turn on paging anyway.)
579 *
580 * A real CPU would silently accept an invalid cr3 and would
581 * attempt to use it - with largely undefined (and often hard
582 * to debug) behavior on the guest side.
583 */
584 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
585 inject_gp(vcpu);
586 else
587 vcpu->mmu.new_cr3(vcpu);
588 spin_unlock(&vcpu->kvm->lock);
589 }
590 EXPORT_SYMBOL_GPL(set_cr3);
591
592 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
593 {
594 if ( cr8 & CR8_RESEVED_BITS) {
595 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
596 inject_gp(vcpu);
597 return;
598 }
599 vcpu->cr8 = cr8;
600 }
601 EXPORT_SYMBOL_GPL(set_cr8);
602
603 void fx_init(struct kvm_vcpu *vcpu)
604 {
605 struct __attribute__ ((__packed__)) fx_image_s {
606 u16 control; //fcw
607 u16 status; //fsw
608 u16 tag; // ftw
609 u16 opcode; //fop
610 u64 ip; // fpu ip
611 u64 operand;// fpu dp
612 u32 mxcsr;
613 u32 mxcsr_mask;
614
615 } *fx_image;
616
617 fx_save(vcpu->host_fx_image);
618 fpu_init();
619 fx_save(vcpu->guest_fx_image);
620 fx_restore(vcpu->host_fx_image);
621
622 fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
623 fx_image->mxcsr = 0x1f80;
624 memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
625 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
626 }
627 EXPORT_SYMBOL_GPL(fx_init);
628
629 static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot)
630 {
631 spin_lock(&vcpu->kvm->lock);
632 kvm_mmu_slot_remove_write_access(vcpu, slot);
633 spin_unlock(&vcpu->kvm->lock);
634 }
635
636 /*
637 * Allocate some memory and give it an address in the guest physical address
638 * space.
639 *
640 * Discontiguous memory is allowed, mostly for framebuffers.
641 */
642 static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
643 struct kvm_memory_region *mem)
644 {
645 int r;
646 gfn_t base_gfn;
647 unsigned long npages;
648 unsigned long i;
649 struct kvm_memory_slot *memslot;
650 struct kvm_memory_slot old, new;
651 int memory_config_version;
652
653 r = -EINVAL;
654 /* General sanity checks */
655 if (mem->memory_size & (PAGE_SIZE - 1))
656 goto out;
657 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
658 goto out;
659 if (mem->slot >= KVM_MEMORY_SLOTS)
660 goto out;
661 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
662 goto out;
663
664 memslot = &kvm->memslots[mem->slot];
665 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
666 npages = mem->memory_size >> PAGE_SHIFT;
667
668 if (!npages)
669 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
670
671 raced:
672 spin_lock(&kvm->lock);
673
674 memory_config_version = kvm->memory_config_version;
675 new = old = *memslot;
676
677 new.base_gfn = base_gfn;
678 new.npages = npages;
679 new.flags = mem->flags;
680
681 /* Disallow changing a memory slot's size. */
682 r = -EINVAL;
683 if (npages && old.npages && npages != old.npages)
684 goto out_unlock;
685
686 /* Check for overlaps */
687 r = -EEXIST;
688 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
689 struct kvm_memory_slot *s = &kvm->memslots[i];
690
691 if (s == memslot)
692 continue;
693 if (!((base_gfn + npages <= s->base_gfn) ||
694 (base_gfn >= s->base_gfn + s->npages)))
695 goto out_unlock;
696 }
697 /*
698 * Do memory allocations outside lock. memory_config_version will
699 * detect any races.
700 */
701 spin_unlock(&kvm->lock);
702
703 /* Deallocate if slot is being removed */
704 if (!npages)
705 new.phys_mem = NULL;
706
707 /* Free page dirty bitmap if unneeded */
708 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
709 new.dirty_bitmap = NULL;
710
711 r = -ENOMEM;
712
713 /* Allocate if a slot is being created */
714 if (npages && !new.phys_mem) {
715 new.phys_mem = vmalloc(npages * sizeof(struct page *));
716
717 if (!new.phys_mem)
718 goto out_free;
719
720 memset(new.phys_mem, 0, npages * sizeof(struct page *));
721 for (i = 0; i < npages; ++i) {
722 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
723 | __GFP_ZERO);
724 if (!new.phys_mem[i])
725 goto out_free;
726 set_page_private(new.phys_mem[i],0);
727 }
728 }
729
730 /* Allocate page dirty bitmap if needed */
731 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
732 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
733
734 new.dirty_bitmap = vmalloc(dirty_bytes);
735 if (!new.dirty_bitmap)
736 goto out_free;
737 memset(new.dirty_bitmap, 0, dirty_bytes);
738 }
739
740 spin_lock(&kvm->lock);
741
742 if (memory_config_version != kvm->memory_config_version) {
743 spin_unlock(&kvm->lock);
744 kvm_free_physmem_slot(&new, &old);
745 goto raced;
746 }
747
748 r = -EAGAIN;
749 if (kvm->busy)
750 goto out_unlock;
751
752 if (mem->slot >= kvm->nmemslots)
753 kvm->nmemslots = mem->slot + 1;
754
755 *memslot = new;
756 ++kvm->memory_config_version;
757
758 spin_unlock(&kvm->lock);
759
760 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
761 struct kvm_vcpu *vcpu;
762
763 vcpu = vcpu_load_slot(kvm, i);
764 if (!vcpu)
765 continue;
766 if (new.flags & KVM_MEM_LOG_DIRTY_PAGES)
767 do_remove_write_access(vcpu, mem->slot);
768 kvm_mmu_reset_context(vcpu);
769 vcpu_put(vcpu);
770 }
771
772 kvm_free_physmem_slot(&old, &new);
773 return 0;
774
775 out_unlock:
776 spin_unlock(&kvm->lock);
777 out_free:
778 kvm_free_physmem_slot(&new, &old);
779 out:
780 return r;
781 }
782
783 /*
784 * Get (and clear) the dirty memory log for a memory slot.
785 */
786 static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
787 struct kvm_dirty_log *log)
788 {
789 struct kvm_memory_slot *memslot;
790 int r, i;
791 int n;
792 int cleared;
793 unsigned long any = 0;
794
795 spin_lock(&kvm->lock);
796
797 /*
798 * Prevent changes to guest memory configuration even while the lock
799 * is not taken.
800 */
801 ++kvm->busy;
802 spin_unlock(&kvm->lock);
803 r = -EINVAL;
804 if (log->slot >= KVM_MEMORY_SLOTS)
805 goto out;
806
807 memslot = &kvm->memslots[log->slot];
808 r = -ENOENT;
809 if (!memslot->dirty_bitmap)
810 goto out;
811
812 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
813
814 for (i = 0; !any && i < n/sizeof(long); ++i)
815 any = memslot->dirty_bitmap[i];
816
817 r = -EFAULT;
818 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
819 goto out;
820
821 if (any) {
822 cleared = 0;
823 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
824 struct kvm_vcpu *vcpu;
825
826 vcpu = vcpu_load_slot(kvm, i);
827 if (!vcpu)
828 continue;
829 if (!cleared) {
830 do_remove_write_access(vcpu, log->slot);
831 memset(memslot->dirty_bitmap, 0, n);
832 cleared = 1;
833 }
834 kvm_arch_ops->tlb_flush(vcpu);
835 vcpu_put(vcpu);
836 }
837 }
838
839 r = 0;
840
841 out:
842 spin_lock(&kvm->lock);
843 --kvm->busy;
844 spin_unlock(&kvm->lock);
845 return r;
846 }
847
848 /*
849 * Set a new alias region. Aliases map a portion of physical memory into
850 * another portion. This is useful for memory windows, for example the PC
851 * VGA region.
852 */
853 static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
854 struct kvm_memory_alias *alias)
855 {
856 int r, n;
857 struct kvm_mem_alias *p;
858
859 r = -EINVAL;
860 /* General sanity checks */
861 if (alias->memory_size & (PAGE_SIZE - 1))
862 goto out;
863 if (alias->guest_phys_addr & (PAGE_SIZE - 1))
864 goto out;
865 if (alias->slot >= KVM_ALIAS_SLOTS)
866 goto out;
867 if (alias->guest_phys_addr + alias->memory_size
868 < alias->guest_phys_addr)
869 goto out;
870 if (alias->target_phys_addr + alias->memory_size
871 < alias->target_phys_addr)
872 goto out;
873
874 spin_lock(&kvm->lock);
875
876 p = &kvm->aliases[alias->slot];
877 p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
878 p->npages = alias->memory_size >> PAGE_SHIFT;
879 p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
880
881 for (n = KVM_ALIAS_SLOTS; n > 0; --n)
882 if (kvm->aliases[n - 1].npages)
883 break;
884 kvm->naliases = n;
885
886 spin_unlock(&kvm->lock);
887
888 vcpu_load(&kvm->vcpus[0]);
889 spin_lock(&kvm->lock);
890 kvm_mmu_zap_all(&kvm->vcpus[0]);
891 spin_unlock(&kvm->lock);
892 vcpu_put(&kvm->vcpus[0]);
893
894 return 0;
895
896 out:
897 return r;
898 }
899
900 static gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
901 {
902 int i;
903 struct kvm_mem_alias *alias;
904
905 for (i = 0; i < kvm->naliases; ++i) {
906 alias = &kvm->aliases[i];
907 if (gfn >= alias->base_gfn
908 && gfn < alias->base_gfn + alias->npages)
909 return alias->target_gfn + gfn - alias->base_gfn;
910 }
911 return gfn;
912 }
913
914 static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
915 {
916 int i;
917
918 for (i = 0; i < kvm->nmemslots; ++i) {
919 struct kvm_memory_slot *memslot = &kvm->memslots[i];
920
921 if (gfn >= memslot->base_gfn
922 && gfn < memslot->base_gfn + memslot->npages)
923 return memslot;
924 }
925 return NULL;
926 }
927
928 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
929 {
930 gfn = unalias_gfn(kvm, gfn);
931 return __gfn_to_memslot(kvm, gfn);
932 }
933
934 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
935 {
936 struct kvm_memory_slot *slot;
937
938 gfn = unalias_gfn(kvm, gfn);
939 slot = __gfn_to_memslot(kvm, gfn);
940 if (!slot)
941 return NULL;
942 return slot->phys_mem[gfn - slot->base_gfn];
943 }
944 EXPORT_SYMBOL_GPL(gfn_to_page);
945
946 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
947 {
948 int i;
949 struct kvm_memory_slot *memslot = NULL;
950 unsigned long rel_gfn;
951
952 for (i = 0; i < kvm->nmemslots; ++i) {
953 memslot = &kvm->memslots[i];
954
955 if (gfn >= memslot->base_gfn
956 && gfn < memslot->base_gfn + memslot->npages) {
957
958 if (!memslot || !memslot->dirty_bitmap)
959 return;
960
961 rel_gfn = gfn - memslot->base_gfn;
962
963 /* avoid RMW */
964 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
965 set_bit(rel_gfn, memslot->dirty_bitmap);
966 return;
967 }
968 }
969 }
970
971 static int emulator_read_std(unsigned long addr,
972 void *val,
973 unsigned int bytes,
974 struct x86_emulate_ctxt *ctxt)
975 {
976 struct kvm_vcpu *vcpu = ctxt->vcpu;
977 void *data = val;
978
979 while (bytes) {
980 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
981 unsigned offset = addr & (PAGE_SIZE-1);
982 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
983 unsigned long pfn;
984 struct page *page;
985 void *page_virt;
986
987 if (gpa == UNMAPPED_GVA)
988 return X86EMUL_PROPAGATE_FAULT;
989 pfn = gpa >> PAGE_SHIFT;
990 page = gfn_to_page(vcpu->kvm, pfn);
991 if (!page)
992 return X86EMUL_UNHANDLEABLE;
993 page_virt = kmap_atomic(page, KM_USER0);
994
995 memcpy(data, page_virt + offset, tocopy);
996
997 kunmap_atomic(page_virt, KM_USER0);
998
999 bytes -= tocopy;
1000 data += tocopy;
1001 addr += tocopy;
1002 }
1003
1004 return X86EMUL_CONTINUE;
1005 }
1006
1007 static int emulator_write_std(unsigned long addr,
1008 const void *val,
1009 unsigned int bytes,
1010 struct x86_emulate_ctxt *ctxt)
1011 {
1012 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
1013 addr, bytes);
1014 return X86EMUL_UNHANDLEABLE;
1015 }
1016
1017 static int emulator_read_emulated(unsigned long addr,
1018 void *val,
1019 unsigned int bytes,
1020 struct x86_emulate_ctxt *ctxt)
1021 {
1022 struct kvm_vcpu *vcpu = ctxt->vcpu;
1023
1024 if (vcpu->mmio_read_completed) {
1025 memcpy(val, vcpu->mmio_data, bytes);
1026 vcpu->mmio_read_completed = 0;
1027 return X86EMUL_CONTINUE;
1028 } else if (emulator_read_std(addr, val, bytes, ctxt)
1029 == X86EMUL_CONTINUE)
1030 return X86EMUL_CONTINUE;
1031 else {
1032 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1033
1034 if (gpa == UNMAPPED_GVA)
1035 return X86EMUL_PROPAGATE_FAULT;
1036 vcpu->mmio_needed = 1;
1037 vcpu->mmio_phys_addr = gpa;
1038 vcpu->mmio_size = bytes;
1039 vcpu->mmio_is_write = 0;
1040
1041 return X86EMUL_UNHANDLEABLE;
1042 }
1043 }
1044
1045 static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
1046 const void *val, int bytes)
1047 {
1048 struct page *page;
1049 void *virt;
1050
1051 if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
1052 return 0;
1053 page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
1054 if (!page)
1055 return 0;
1056 kvm_mmu_pre_write(vcpu, gpa, bytes);
1057 mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
1058 virt = kmap_atomic(page, KM_USER0);
1059 memcpy(virt + offset_in_page(gpa), val, bytes);
1060 kunmap_atomic(virt, KM_USER0);
1061 kvm_mmu_post_write(vcpu, gpa, bytes);
1062 return 1;
1063 }
1064
1065 static int emulator_write_emulated(unsigned long addr,
1066 const void *val,
1067 unsigned int bytes,
1068 struct x86_emulate_ctxt *ctxt)
1069 {
1070 struct kvm_vcpu *vcpu = ctxt->vcpu;
1071 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1072
1073 if (gpa == UNMAPPED_GVA) {
1074 kvm_arch_ops->inject_page_fault(vcpu, addr, 2);
1075 return X86EMUL_PROPAGATE_FAULT;
1076 }
1077
1078 if (emulator_write_phys(vcpu, gpa, val, bytes))
1079 return X86EMUL_CONTINUE;
1080
1081 vcpu->mmio_needed = 1;
1082 vcpu->mmio_phys_addr = gpa;
1083 vcpu->mmio_size = bytes;
1084 vcpu->mmio_is_write = 1;
1085 memcpy(vcpu->mmio_data, val, bytes);
1086
1087 return X86EMUL_CONTINUE;
1088 }
1089
1090 static int emulator_cmpxchg_emulated(unsigned long addr,
1091 const void *old,
1092 const void *new,
1093 unsigned int bytes,
1094 struct x86_emulate_ctxt *ctxt)
1095 {
1096 static int reported;
1097
1098 if (!reported) {
1099 reported = 1;
1100 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1101 }
1102 return emulator_write_emulated(addr, new, bytes, ctxt);
1103 }
1104
1105 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1106 {
1107 return kvm_arch_ops->get_segment_base(vcpu, seg);
1108 }
1109
1110 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1111 {
1112 return X86EMUL_CONTINUE;
1113 }
1114
1115 int emulate_clts(struct kvm_vcpu *vcpu)
1116 {
1117 unsigned long cr0;
1118
1119 cr0 = vcpu->cr0 & ~CR0_TS_MASK;
1120 kvm_arch_ops->set_cr0(vcpu, cr0);
1121 return X86EMUL_CONTINUE;
1122 }
1123
1124 int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1125 {
1126 struct kvm_vcpu *vcpu = ctxt->vcpu;
1127
1128 switch (dr) {
1129 case 0 ... 3:
1130 *dest = kvm_arch_ops->get_dr(vcpu, dr);
1131 return X86EMUL_CONTINUE;
1132 default:
1133 printk(KERN_DEBUG "%s: unexpected dr %u\n",
1134 __FUNCTION__, dr);
1135 return X86EMUL_UNHANDLEABLE;
1136 }
1137 }
1138
1139 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1140 {
1141 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1142 int exception;
1143
1144 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1145 if (exception) {
1146 /* FIXME: better handling */
1147 return X86EMUL_UNHANDLEABLE;
1148 }
1149 return X86EMUL_CONTINUE;
1150 }
1151
1152 static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1153 {
1154 static int reported;
1155 u8 opcodes[4];
1156 unsigned long rip = ctxt->vcpu->rip;
1157 unsigned long rip_linear;
1158
1159 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1160
1161 if (reported)
1162 return;
1163
1164 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
1165
1166 printk(KERN_ERR "emulation failed but !mmio_needed?"
1167 " rip %lx %02x %02x %02x %02x\n",
1168 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1169 reported = 1;
1170 }
1171
1172 struct x86_emulate_ops emulate_ops = {
1173 .read_std = emulator_read_std,
1174 .write_std = emulator_write_std,
1175 .read_emulated = emulator_read_emulated,
1176 .write_emulated = emulator_write_emulated,
1177 .cmpxchg_emulated = emulator_cmpxchg_emulated,
1178 };
1179
1180 int emulate_instruction(struct kvm_vcpu *vcpu,
1181 struct kvm_run *run,
1182 unsigned long cr2,
1183 u16 error_code)
1184 {
1185 struct x86_emulate_ctxt emulate_ctxt;
1186 int r;
1187 int cs_db, cs_l;
1188
1189 vcpu->mmio_fault_cr2 = cr2;
1190 kvm_arch_ops->cache_regs(vcpu);
1191
1192 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1193
1194 emulate_ctxt.vcpu = vcpu;
1195 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1196 emulate_ctxt.cr2 = cr2;
1197 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1198 ? X86EMUL_MODE_REAL : cs_l
1199 ? X86EMUL_MODE_PROT64 : cs_db
1200 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1201
1202 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1203 emulate_ctxt.cs_base = 0;
1204 emulate_ctxt.ds_base = 0;
1205 emulate_ctxt.es_base = 0;
1206 emulate_ctxt.ss_base = 0;
1207 } else {
1208 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1209 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1210 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1211 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1212 }
1213
1214 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1215 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1216
1217 vcpu->mmio_is_write = 0;
1218 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1219
1220 if ((r || vcpu->mmio_is_write) && run) {
1221 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1222 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1223 run->mmio.len = vcpu->mmio_size;
1224 run->mmio.is_write = vcpu->mmio_is_write;
1225 }
1226
1227 if (r) {
1228 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1229 return EMULATE_DONE;
1230 if (!vcpu->mmio_needed) {
1231 report_emulation_failure(&emulate_ctxt);
1232 return EMULATE_FAIL;
1233 }
1234 return EMULATE_DO_MMIO;
1235 }
1236
1237 kvm_arch_ops->decache_regs(vcpu);
1238 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1239
1240 if (vcpu->mmio_is_write) {
1241 vcpu->mmio_needed = 0;
1242 return EMULATE_DO_MMIO;
1243 }
1244
1245 return EMULATE_DONE;
1246 }
1247 EXPORT_SYMBOL_GPL(emulate_instruction);
1248
1249 int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run)
1250 {
1251 unsigned long nr, a0, a1, a2, a3, a4, a5, ret;
1252
1253 kvm_arch_ops->cache_regs(vcpu);
1254 ret = -KVM_EINVAL;
1255 #ifdef CONFIG_X86_64
1256 if (is_long_mode(vcpu)) {
1257 nr = vcpu->regs[VCPU_REGS_RAX];
1258 a0 = vcpu->regs[VCPU_REGS_RDI];
1259 a1 = vcpu->regs[VCPU_REGS_RSI];
1260 a2 = vcpu->regs[VCPU_REGS_RDX];
1261 a3 = vcpu->regs[VCPU_REGS_RCX];
1262 a4 = vcpu->regs[VCPU_REGS_R8];
1263 a5 = vcpu->regs[VCPU_REGS_R9];
1264 } else
1265 #endif
1266 {
1267 nr = vcpu->regs[VCPU_REGS_RBX] & -1u;
1268 a0 = vcpu->regs[VCPU_REGS_RAX] & -1u;
1269 a1 = vcpu->regs[VCPU_REGS_RCX] & -1u;
1270 a2 = vcpu->regs[VCPU_REGS_RDX] & -1u;
1271 a3 = vcpu->regs[VCPU_REGS_RSI] & -1u;
1272 a4 = vcpu->regs[VCPU_REGS_RDI] & -1u;
1273 a5 = vcpu->regs[VCPU_REGS_RBP] & -1u;
1274 }
1275 switch (nr) {
1276 default:
1277 run->hypercall.args[0] = a0;
1278 run->hypercall.args[1] = a1;
1279 run->hypercall.args[2] = a2;
1280 run->hypercall.args[3] = a3;
1281 run->hypercall.args[4] = a4;
1282 run->hypercall.args[5] = a5;
1283 run->hypercall.ret = ret;
1284 run->hypercall.longmode = is_long_mode(vcpu);
1285 kvm_arch_ops->decache_regs(vcpu);
1286 return 0;
1287 }
1288 vcpu->regs[VCPU_REGS_RAX] = ret;
1289 kvm_arch_ops->decache_regs(vcpu);
1290 return 1;
1291 }
1292 EXPORT_SYMBOL_GPL(kvm_hypercall);
1293
1294 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1295 {
1296 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1297 }
1298
1299 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1300 {
1301 struct descriptor_table dt = { limit, base };
1302
1303 kvm_arch_ops->set_gdt(vcpu, &dt);
1304 }
1305
1306 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1307 {
1308 struct descriptor_table dt = { limit, base };
1309
1310 kvm_arch_ops->set_idt(vcpu, &dt);
1311 }
1312
1313 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1314 unsigned long *rflags)
1315 {
1316 lmsw(vcpu, msw);
1317 *rflags = kvm_arch_ops->get_rflags(vcpu);
1318 }
1319
1320 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1321 {
1322 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
1323 switch (cr) {
1324 case 0:
1325 return vcpu->cr0;
1326 case 2:
1327 return vcpu->cr2;
1328 case 3:
1329 return vcpu->cr3;
1330 case 4:
1331 return vcpu->cr4;
1332 default:
1333 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1334 return 0;
1335 }
1336 }
1337
1338 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1339 unsigned long *rflags)
1340 {
1341 switch (cr) {
1342 case 0:
1343 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1344 *rflags = kvm_arch_ops->get_rflags(vcpu);
1345 break;
1346 case 2:
1347 vcpu->cr2 = val;
1348 break;
1349 case 3:
1350 set_cr3(vcpu, val);
1351 break;
1352 case 4:
1353 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1354 break;
1355 default:
1356 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1357 }
1358 }
1359
1360 /*
1361 * Register the para guest with the host:
1362 */
1363 static int vcpu_register_para(struct kvm_vcpu *vcpu, gpa_t para_state_gpa)
1364 {
1365 struct kvm_vcpu_para_state *para_state;
1366 hpa_t para_state_hpa, hypercall_hpa;
1367 struct page *para_state_page;
1368 unsigned char *hypercall;
1369 gpa_t hypercall_gpa;
1370
1371 printk(KERN_DEBUG "kvm: guest trying to enter paravirtual mode\n");
1372 printk(KERN_DEBUG ".... para_state_gpa: %08Lx\n", para_state_gpa);
1373
1374 /*
1375 * Needs to be page aligned:
1376 */
1377 if (para_state_gpa != PAGE_ALIGN(para_state_gpa))
1378 goto err_gp;
1379
1380 para_state_hpa = gpa_to_hpa(vcpu, para_state_gpa);
1381 printk(KERN_DEBUG ".... para_state_hpa: %08Lx\n", para_state_hpa);
1382 if (is_error_hpa(para_state_hpa))
1383 goto err_gp;
1384
1385 mark_page_dirty(vcpu->kvm, para_state_gpa >> PAGE_SHIFT);
1386 para_state_page = pfn_to_page(para_state_hpa >> PAGE_SHIFT);
1387 para_state = kmap_atomic(para_state_page, KM_USER0);
1388
1389 printk(KERN_DEBUG ".... guest version: %d\n", para_state->guest_version);
1390 printk(KERN_DEBUG ".... size: %d\n", para_state->size);
1391
1392 para_state->host_version = KVM_PARA_API_VERSION;
1393 /*
1394 * We cannot support guests that try to register themselves
1395 * with a newer API version than the host supports:
1396 */
1397 if (para_state->guest_version > KVM_PARA_API_VERSION) {
1398 para_state->ret = -KVM_EINVAL;
1399 goto err_kunmap_skip;
1400 }
1401
1402 hypercall_gpa = para_state->hypercall_gpa;
1403 hypercall_hpa = gpa_to_hpa(vcpu, hypercall_gpa);
1404 printk(KERN_DEBUG ".... hypercall_hpa: %08Lx\n", hypercall_hpa);
1405 if (is_error_hpa(hypercall_hpa)) {
1406 para_state->ret = -KVM_EINVAL;
1407 goto err_kunmap_skip;
1408 }
1409
1410 printk(KERN_DEBUG "kvm: para guest successfully registered.\n");
1411 vcpu->para_state_page = para_state_page;
1412 vcpu->para_state_gpa = para_state_gpa;
1413 vcpu->hypercall_gpa = hypercall_gpa;
1414
1415 mark_page_dirty(vcpu->kvm, hypercall_gpa >> PAGE_SHIFT);
1416 hypercall = kmap_atomic(pfn_to_page(hypercall_hpa >> PAGE_SHIFT),
1417 KM_USER1) + (hypercall_hpa & ~PAGE_MASK);
1418 kvm_arch_ops->patch_hypercall(vcpu, hypercall);
1419 kunmap_atomic(hypercall, KM_USER1);
1420
1421 para_state->ret = 0;
1422 err_kunmap_skip:
1423 kunmap_atomic(para_state, KM_USER0);
1424 return 0;
1425 err_gp:
1426 return 1;
1427 }
1428
1429 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1430 {
1431 u64 data;
1432
1433 switch (msr) {
1434 case 0xc0010010: /* SYSCFG */
1435 case 0xc0010015: /* HWCR */
1436 case MSR_IA32_PLATFORM_ID:
1437 case MSR_IA32_P5_MC_ADDR:
1438 case MSR_IA32_P5_MC_TYPE:
1439 case MSR_IA32_MC0_CTL:
1440 case MSR_IA32_MCG_STATUS:
1441 case MSR_IA32_MCG_CAP:
1442 case MSR_IA32_MC0_MISC:
1443 case MSR_IA32_MC0_MISC+4:
1444 case MSR_IA32_MC0_MISC+8:
1445 case MSR_IA32_MC0_MISC+12:
1446 case MSR_IA32_MC0_MISC+16:
1447 case MSR_IA32_UCODE_REV:
1448 case MSR_IA32_PERF_STATUS:
1449 /* MTRR registers */
1450 case 0xfe:
1451 case 0x200 ... 0x2ff:
1452 data = 0;
1453 break;
1454 case 0xcd: /* fsb frequency */
1455 data = 3;
1456 break;
1457 case MSR_IA32_APICBASE:
1458 data = vcpu->apic_base;
1459 break;
1460 case MSR_IA32_MISC_ENABLE:
1461 data = vcpu->ia32_misc_enable_msr;
1462 break;
1463 #ifdef CONFIG_X86_64
1464 case MSR_EFER:
1465 data = vcpu->shadow_efer;
1466 break;
1467 #endif
1468 default:
1469 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1470 return 1;
1471 }
1472 *pdata = data;
1473 return 0;
1474 }
1475 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1476
1477 /*
1478 * Reads an msr value (of 'msr_index') into 'pdata'.
1479 * Returns 0 on success, non-0 otherwise.
1480 * Assumes vcpu_load() was already called.
1481 */
1482 static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1483 {
1484 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1485 }
1486
1487 #ifdef CONFIG_X86_64
1488
1489 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
1490 {
1491 if (efer & EFER_RESERVED_BITS) {
1492 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1493 efer);
1494 inject_gp(vcpu);
1495 return;
1496 }
1497
1498 if (is_paging(vcpu)
1499 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1500 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1501 inject_gp(vcpu);
1502 return;
1503 }
1504
1505 kvm_arch_ops->set_efer(vcpu, efer);
1506
1507 efer &= ~EFER_LMA;
1508 efer |= vcpu->shadow_efer & EFER_LMA;
1509
1510 vcpu->shadow_efer = efer;
1511 }
1512
1513 #endif
1514
1515 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1516 {
1517 switch (msr) {
1518 #ifdef CONFIG_X86_64
1519 case MSR_EFER:
1520 set_efer(vcpu, data);
1521 break;
1522 #endif
1523 case MSR_IA32_MC0_STATUS:
1524 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1525 __FUNCTION__, data);
1526 break;
1527 case MSR_IA32_MCG_STATUS:
1528 printk(KERN_WARNING "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
1529 __FUNCTION__, data);
1530 break;
1531 case MSR_IA32_UCODE_REV:
1532 case MSR_IA32_UCODE_WRITE:
1533 case 0x200 ... 0x2ff: /* MTRRs */
1534 break;
1535 case MSR_IA32_APICBASE:
1536 vcpu->apic_base = data;
1537 break;
1538 case MSR_IA32_MISC_ENABLE:
1539 vcpu->ia32_misc_enable_msr = data;
1540 break;
1541 /*
1542 * This is the 'probe whether the host is KVM' logic:
1543 */
1544 case MSR_KVM_API_MAGIC:
1545 return vcpu_register_para(vcpu, data);
1546
1547 default:
1548 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1549 return 1;
1550 }
1551 return 0;
1552 }
1553 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1554
1555 /*
1556 * Writes msr value into into the appropriate "register".
1557 * Returns 0 on success, non-0 otherwise.
1558 * Assumes vcpu_load() was already called.
1559 */
1560 static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1561 {
1562 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1563 }
1564
1565 void kvm_resched(struct kvm_vcpu *vcpu)
1566 {
1567 if (!need_resched())
1568 return;
1569 vcpu_put(vcpu);
1570 cond_resched();
1571 vcpu_load(vcpu);
1572 }
1573 EXPORT_SYMBOL_GPL(kvm_resched);
1574
1575 void load_msrs(struct vmx_msr_entry *e, int n)
1576 {
1577 int i;
1578
1579 for (i = 0; i < n; ++i)
1580 wrmsrl(e[i].index, e[i].data);
1581 }
1582 EXPORT_SYMBOL_GPL(load_msrs);
1583
1584 void save_msrs(struct vmx_msr_entry *e, int n)
1585 {
1586 int i;
1587
1588 for (i = 0; i < n; ++i)
1589 rdmsrl(e[i].index, e[i].data);
1590 }
1591 EXPORT_SYMBOL_GPL(save_msrs);
1592
1593 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
1594 {
1595 int i;
1596 u32 function;
1597 struct kvm_cpuid_entry *e, *best;
1598
1599 kvm_arch_ops->cache_regs(vcpu);
1600 function = vcpu->regs[VCPU_REGS_RAX];
1601 vcpu->regs[VCPU_REGS_RAX] = 0;
1602 vcpu->regs[VCPU_REGS_RBX] = 0;
1603 vcpu->regs[VCPU_REGS_RCX] = 0;
1604 vcpu->regs[VCPU_REGS_RDX] = 0;
1605 best = NULL;
1606 for (i = 0; i < vcpu->cpuid_nent; ++i) {
1607 e = &vcpu->cpuid_entries[i];
1608 if (e->function == function) {
1609 best = e;
1610 break;
1611 }
1612 /*
1613 * Both basic or both extended?
1614 */
1615 if (((e->function ^ function) & 0x80000000) == 0)
1616 if (!best || e->function > best->function)
1617 best = e;
1618 }
1619 if (best) {
1620 vcpu->regs[VCPU_REGS_RAX] = best->eax;
1621 vcpu->regs[VCPU_REGS_RBX] = best->ebx;
1622 vcpu->regs[VCPU_REGS_RCX] = best->ecx;
1623 vcpu->regs[VCPU_REGS_RDX] = best->edx;
1624 }
1625 kvm_arch_ops->decache_regs(vcpu);
1626 kvm_arch_ops->skip_emulated_instruction(vcpu);
1627 }
1628 EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
1629
1630 static int pio_copy_data(struct kvm_vcpu *vcpu)
1631 {
1632 void *p = vcpu->pio_data;
1633 void *q;
1634 unsigned bytes;
1635 int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
1636
1637 kvm_arch_ops->vcpu_put(vcpu);
1638 q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
1639 PAGE_KERNEL);
1640 if (!q) {
1641 kvm_arch_ops->vcpu_load(vcpu);
1642 free_pio_guest_pages(vcpu);
1643 return -ENOMEM;
1644 }
1645 q += vcpu->pio.guest_page_offset;
1646 bytes = vcpu->pio.size * vcpu->pio.cur_count;
1647 if (vcpu->pio.in)
1648 memcpy(q, p, bytes);
1649 else
1650 memcpy(p, q, bytes);
1651 q -= vcpu->pio.guest_page_offset;
1652 vunmap(q);
1653 kvm_arch_ops->vcpu_load(vcpu);
1654 free_pio_guest_pages(vcpu);
1655 return 0;
1656 }
1657
1658 static int complete_pio(struct kvm_vcpu *vcpu)
1659 {
1660 struct kvm_pio_request *io = &vcpu->pio;
1661 long delta;
1662 int r;
1663
1664 kvm_arch_ops->cache_regs(vcpu);
1665
1666 if (!io->string) {
1667 if (io->in)
1668 memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
1669 io->size);
1670 } else {
1671 if (io->in) {
1672 r = pio_copy_data(vcpu);
1673 if (r) {
1674 kvm_arch_ops->cache_regs(vcpu);
1675 return r;
1676 }
1677 }
1678
1679 delta = 1;
1680 if (io->rep) {
1681 delta *= io->cur_count;
1682 /*
1683 * The size of the register should really depend on
1684 * current address size.
1685 */
1686 vcpu->regs[VCPU_REGS_RCX] -= delta;
1687 }
1688 if (io->down)
1689 delta = -delta;
1690 delta *= io->size;
1691 if (io->in)
1692 vcpu->regs[VCPU_REGS_RDI] += delta;
1693 else
1694 vcpu->regs[VCPU_REGS_RSI] += delta;
1695 }
1696
1697 kvm_arch_ops->decache_regs(vcpu);
1698
1699 io->count -= io->cur_count;
1700 io->cur_count = 0;
1701
1702 if (!io->count)
1703 kvm_arch_ops->skip_emulated_instruction(vcpu);
1704 return 0;
1705 }
1706
1707 int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1708 int size, unsigned long count, int string, int down,
1709 gva_t address, int rep, unsigned port)
1710 {
1711 unsigned now, in_page;
1712 int i;
1713 int nr_pages = 1;
1714 struct page *page;
1715
1716 vcpu->run->exit_reason = KVM_EXIT_IO;
1717 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1718 vcpu->run->io.size = size;
1719 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1720 vcpu->run->io.count = count;
1721 vcpu->run->io.port = port;
1722 vcpu->pio.count = count;
1723 vcpu->pio.cur_count = count;
1724 vcpu->pio.size = size;
1725 vcpu->pio.in = in;
1726 vcpu->pio.string = string;
1727 vcpu->pio.down = down;
1728 vcpu->pio.guest_page_offset = offset_in_page(address);
1729 vcpu->pio.rep = rep;
1730
1731 if (!string) {
1732 kvm_arch_ops->cache_regs(vcpu);
1733 memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
1734 kvm_arch_ops->decache_regs(vcpu);
1735 return 0;
1736 }
1737
1738 if (!count) {
1739 kvm_arch_ops->skip_emulated_instruction(vcpu);
1740 return 1;
1741 }
1742
1743 now = min(count, PAGE_SIZE / size);
1744
1745 if (!down)
1746 in_page = PAGE_SIZE - offset_in_page(address);
1747 else
1748 in_page = offset_in_page(address) + size;
1749 now = min(count, (unsigned long)in_page / size);
1750 if (!now) {
1751 /*
1752 * String I/O straddles page boundary. Pin two guest pages
1753 * so that we satisfy atomicity constraints. Do just one
1754 * transaction to avoid complexity.
1755 */
1756 nr_pages = 2;
1757 now = 1;
1758 }
1759 if (down) {
1760 /*
1761 * String I/O in reverse. Yuck. Kill the guest, fix later.
1762 */
1763 printk(KERN_ERR "kvm: guest string pio down\n");
1764 inject_gp(vcpu);
1765 return 1;
1766 }
1767 vcpu->run->io.count = now;
1768 vcpu->pio.cur_count = now;
1769
1770 for (i = 0; i < nr_pages; ++i) {
1771 spin_lock(&vcpu->kvm->lock);
1772 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
1773 if (page)
1774 get_page(page);
1775 vcpu->pio.guest_pages[i] = page;
1776 spin_unlock(&vcpu->kvm->lock);
1777 if (!page) {
1778 inject_gp(vcpu);
1779 free_pio_guest_pages(vcpu);
1780 return 1;
1781 }
1782 }
1783
1784 if (!vcpu->pio.in)
1785 return pio_copy_data(vcpu);
1786 return 0;
1787 }
1788 EXPORT_SYMBOL_GPL(kvm_setup_pio);
1789
1790 static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1791 {
1792 int r;
1793 sigset_t sigsaved;
1794
1795 vcpu_load(vcpu);
1796
1797 if (vcpu->sigset_active)
1798 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
1799
1800 /* re-sync apic's tpr */
1801 vcpu->cr8 = kvm_run->cr8;
1802
1803 if (vcpu->pio.cur_count) {
1804 r = complete_pio(vcpu);
1805 if (r)
1806 goto out;
1807 }
1808
1809 if (vcpu->mmio_needed) {
1810 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1811 vcpu->mmio_read_completed = 1;
1812 vcpu->mmio_needed = 0;
1813 r = emulate_instruction(vcpu, kvm_run,
1814 vcpu->mmio_fault_cr2, 0);
1815 if (r == EMULATE_DO_MMIO) {
1816 /*
1817 * Read-modify-write. Back to userspace.
1818 */
1819 kvm_run->exit_reason = KVM_EXIT_MMIO;
1820 r = 0;
1821 goto out;
1822 }
1823 }
1824
1825 if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
1826 kvm_arch_ops->cache_regs(vcpu);
1827 vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
1828 kvm_arch_ops->decache_regs(vcpu);
1829 }
1830
1831 r = kvm_arch_ops->run(vcpu, kvm_run);
1832
1833 out:
1834 if (vcpu->sigset_active)
1835 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1836
1837 vcpu_put(vcpu);
1838 return r;
1839 }
1840
1841 static int kvm_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu,
1842 struct kvm_regs *regs)
1843 {
1844 vcpu_load(vcpu);
1845
1846 kvm_arch_ops->cache_regs(vcpu);
1847
1848 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1849 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1850 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1851 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1852 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1853 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1854 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1855 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
1856 #ifdef CONFIG_X86_64
1857 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1858 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1859 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1860 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1861 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1862 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1863 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1864 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1865 #endif
1866
1867 regs->rip = vcpu->rip;
1868 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1869
1870 /*
1871 * Don't leak debug flags in case they were set for guest debugging
1872 */
1873 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1874 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1875
1876 vcpu_put(vcpu);
1877
1878 return 0;
1879 }
1880
1881 static int kvm_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu,
1882 struct kvm_regs *regs)
1883 {
1884 vcpu_load(vcpu);
1885
1886 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1887 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1888 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1889 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1890 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1891 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1892 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1893 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
1894 #ifdef CONFIG_X86_64
1895 vcpu->regs[VCPU_REGS_R8] = regs->r8;
1896 vcpu->regs[VCPU_REGS_R9] = regs->r9;
1897 vcpu->regs[VCPU_REGS_R10] = regs->r10;
1898 vcpu->regs[VCPU_REGS_R11] = regs->r11;
1899 vcpu->regs[VCPU_REGS_R12] = regs->r12;
1900 vcpu->regs[VCPU_REGS_R13] = regs->r13;
1901 vcpu->regs[VCPU_REGS_R14] = regs->r14;
1902 vcpu->regs[VCPU_REGS_R15] = regs->r15;
1903 #endif
1904
1905 vcpu->rip = regs->rip;
1906 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1907
1908 kvm_arch_ops->decache_regs(vcpu);
1909
1910 vcpu_put(vcpu);
1911
1912 return 0;
1913 }
1914
1915 static void get_segment(struct kvm_vcpu *vcpu,
1916 struct kvm_segment *var, int seg)
1917 {
1918 return kvm_arch_ops->get_segment(vcpu, var, seg);
1919 }
1920
1921 static int kvm_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
1922 struct kvm_sregs *sregs)
1923 {
1924 struct descriptor_table dt;
1925
1926 vcpu_load(vcpu);
1927
1928 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1929 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1930 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1931 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1932 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1933 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1934
1935 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1936 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1937
1938 kvm_arch_ops->get_idt(vcpu, &dt);
1939 sregs->idt.limit = dt.limit;
1940 sregs->idt.base = dt.base;
1941 kvm_arch_ops->get_gdt(vcpu, &dt);
1942 sregs->gdt.limit = dt.limit;
1943 sregs->gdt.base = dt.base;
1944
1945 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
1946 sregs->cr0 = vcpu->cr0;
1947 sregs->cr2 = vcpu->cr2;
1948 sregs->cr3 = vcpu->cr3;
1949 sregs->cr4 = vcpu->cr4;
1950 sregs->cr8 = vcpu->cr8;
1951 sregs->efer = vcpu->shadow_efer;
1952 sregs->apic_base = vcpu->apic_base;
1953
1954 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
1955 sizeof sregs->interrupt_bitmap);
1956
1957 vcpu_put(vcpu);
1958
1959 return 0;
1960 }
1961
1962 static void set_segment(struct kvm_vcpu *vcpu,
1963 struct kvm_segment *var, int seg)
1964 {
1965 return kvm_arch_ops->set_segment(vcpu, var, seg);
1966 }
1967
1968 static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
1969 struct kvm_sregs *sregs)
1970 {
1971 int mmu_reset_needed = 0;
1972 int i;
1973 struct descriptor_table dt;
1974
1975 vcpu_load(vcpu);
1976
1977 dt.limit = sregs->idt.limit;
1978 dt.base = sregs->idt.base;
1979 kvm_arch_ops->set_idt(vcpu, &dt);
1980 dt.limit = sregs->gdt.limit;
1981 dt.base = sregs->gdt.base;
1982 kvm_arch_ops->set_gdt(vcpu, &dt);
1983
1984 vcpu->cr2 = sregs->cr2;
1985 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
1986 vcpu->cr3 = sregs->cr3;
1987
1988 vcpu->cr8 = sregs->cr8;
1989
1990 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
1991 #ifdef CONFIG_X86_64
1992 kvm_arch_ops->set_efer(vcpu, sregs->efer);
1993 #endif
1994 vcpu->apic_base = sregs->apic_base;
1995
1996 kvm_arch_ops->decache_cr4_guest_bits(vcpu);
1997
1998 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
1999 kvm_arch_ops->set_cr0(vcpu, sregs->cr0);
2000
2001 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
2002 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
2003 if (!is_long_mode(vcpu) && is_pae(vcpu))
2004 load_pdptrs(vcpu, vcpu->cr3);
2005
2006 if (mmu_reset_needed)
2007 kvm_mmu_reset_context(vcpu);
2008
2009 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
2010 sizeof vcpu->irq_pending);
2011 vcpu->irq_summary = 0;
2012 for (i = 0; i < NR_IRQ_WORDS; ++i)
2013 if (vcpu->irq_pending[i])
2014 __set_bit(i, &vcpu->irq_summary);
2015
2016 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2017 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2018 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2019 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2020 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2021 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2022
2023 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2024 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2025
2026 vcpu_put(vcpu);
2027
2028 return 0;
2029 }
2030
2031 /*
2032 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
2033 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
2034 *
2035 * This list is modified at module load time to reflect the
2036 * capabilities of the host cpu.
2037 */
2038 static u32 msrs_to_save[] = {
2039 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
2040 MSR_K6_STAR,
2041 #ifdef CONFIG_X86_64
2042 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
2043 #endif
2044 MSR_IA32_TIME_STAMP_COUNTER,
2045 };
2046
2047 static unsigned num_msrs_to_save;
2048
2049 static u32 emulated_msrs[] = {
2050 MSR_IA32_MISC_ENABLE,
2051 };
2052
2053 static __init void kvm_init_msr_list(void)
2054 {
2055 u32 dummy[2];
2056 unsigned i, j;
2057
2058 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
2059 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
2060 continue;
2061 if (j < i)
2062 msrs_to_save[j] = msrs_to_save[i];
2063 j++;
2064 }
2065 num_msrs_to_save = j;
2066 }
2067
2068 /*
2069 * Adapt set_msr() to msr_io()'s calling convention
2070 */
2071 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
2072 {
2073 return set_msr(vcpu, index, *data);
2074 }
2075
2076 /*
2077 * Read or write a bunch of msrs. All parameters are kernel addresses.
2078 *
2079 * @return number of msrs set successfully.
2080 */
2081 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
2082 struct kvm_msr_entry *entries,
2083 int (*do_msr)(struct kvm_vcpu *vcpu,
2084 unsigned index, u64 *data))
2085 {
2086 int i;
2087
2088 vcpu_load(vcpu);
2089
2090 for (i = 0; i < msrs->nmsrs; ++i)
2091 if (do_msr(vcpu, entries[i].index, &entries[i].data))
2092 break;
2093
2094 vcpu_put(vcpu);
2095
2096 return i;
2097 }
2098
2099 /*
2100 * Read or write a bunch of msrs. Parameters are user addresses.
2101 *
2102 * @return number of msrs set successfully.
2103 */
2104 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
2105 int (*do_msr)(struct kvm_vcpu *vcpu,
2106 unsigned index, u64 *data),
2107 int writeback)
2108 {
2109 struct kvm_msrs msrs;
2110 struct kvm_msr_entry *entries;
2111 int r, n;
2112 unsigned size;
2113
2114 r = -EFAULT;
2115 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
2116 goto out;
2117
2118 r = -E2BIG;
2119 if (msrs.nmsrs >= MAX_IO_MSRS)
2120 goto out;
2121
2122 r = -ENOMEM;
2123 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
2124 entries = vmalloc(size);
2125 if (!entries)
2126 goto out;
2127
2128 r = -EFAULT;
2129 if (copy_from_user(entries, user_msrs->entries, size))
2130 goto out_free;
2131
2132 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
2133 if (r < 0)
2134 goto out_free;
2135
2136 r = -EFAULT;
2137 if (writeback && copy_to_user(user_msrs->entries, entries, size))
2138 goto out_free;
2139
2140 r = n;
2141
2142 out_free:
2143 vfree(entries);
2144 out:
2145 return r;
2146 }
2147
2148 /*
2149 * Translate a guest virtual address to a guest physical address.
2150 */
2151 static int kvm_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
2152 struct kvm_translation *tr)
2153 {
2154 unsigned long vaddr = tr->linear_address;
2155 gpa_t gpa;
2156
2157 vcpu_load(vcpu);
2158 spin_lock(&vcpu->kvm->lock);
2159 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
2160 tr->physical_address = gpa;
2161 tr->valid = gpa != UNMAPPED_GVA;
2162 tr->writeable = 1;
2163 tr->usermode = 0;
2164 spin_unlock(&vcpu->kvm->lock);
2165 vcpu_put(vcpu);
2166
2167 return 0;
2168 }
2169
2170 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
2171 struct kvm_interrupt *irq)
2172 {
2173 if (irq->irq < 0 || irq->irq >= 256)
2174 return -EINVAL;
2175 vcpu_load(vcpu);
2176
2177 set_bit(irq->irq, vcpu->irq_pending);
2178 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
2179
2180 vcpu_put(vcpu);
2181
2182 return 0;
2183 }
2184
2185 static int kvm_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
2186 struct kvm_debug_guest *dbg)
2187 {
2188 int r;
2189
2190 vcpu_load(vcpu);
2191
2192 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
2193
2194 vcpu_put(vcpu);
2195
2196 return r;
2197 }
2198
2199 static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
2200 unsigned long address,
2201 int *type)
2202 {
2203 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
2204 unsigned long pgoff;
2205 struct page *page;
2206
2207 *type = VM_FAULT_MINOR;
2208 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
2209 if (pgoff == 0)
2210 page = virt_to_page(vcpu->run);
2211 else if (pgoff == KVM_PIO_PAGE_OFFSET)
2212 page = virt_to_page(vcpu->pio_data);
2213 else
2214 return NOPAGE_SIGBUS;
2215 get_page(page);
2216 return page;
2217 }
2218
2219 static struct vm_operations_struct kvm_vcpu_vm_ops = {
2220 .nopage = kvm_vcpu_nopage,
2221 };
2222
2223 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2224 {
2225 vma->vm_ops = &kvm_vcpu_vm_ops;
2226 return 0;
2227 }
2228
2229 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2230 {
2231 struct kvm_vcpu *vcpu = filp->private_data;
2232
2233 fput(vcpu->kvm->filp);
2234 return 0;
2235 }
2236
2237 static struct file_operations kvm_vcpu_fops = {
2238 .release = kvm_vcpu_release,
2239 .unlocked_ioctl = kvm_vcpu_ioctl,
2240 .compat_ioctl = kvm_vcpu_ioctl,
2241 .mmap = kvm_vcpu_mmap,
2242 };
2243
2244 /*
2245 * Allocates an inode for the vcpu.
2246 */
2247 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2248 {
2249 int fd, r;
2250 struct inode *inode;
2251 struct file *file;
2252
2253 atomic_inc(&vcpu->kvm->filp->f_count);
2254 inode = kvmfs_inode(&kvm_vcpu_fops);
2255 if (IS_ERR(inode)) {
2256 r = PTR_ERR(inode);
2257 goto out1;
2258 }
2259
2260 file = kvmfs_file(inode, vcpu);
2261 if (IS_ERR(file)) {
2262 r = PTR_ERR(file);
2263 goto out2;
2264 }
2265
2266 r = get_unused_fd();
2267 if (r < 0)
2268 goto out3;
2269 fd = r;
2270 fd_install(fd, file);
2271
2272 return fd;
2273
2274 out3:
2275 fput(file);
2276 out2:
2277 iput(inode);
2278 out1:
2279 fput(vcpu->kvm->filp);
2280 return r;
2281 }
2282
2283 /*
2284 * Creates some virtual cpus. Good luck creating more than one.
2285 */
2286 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
2287 {
2288 int r;
2289 struct kvm_vcpu *vcpu;
2290 struct page *page;
2291
2292 r = -EINVAL;
2293 if (!valid_vcpu(n))
2294 goto out;
2295
2296 vcpu = &kvm->vcpus[n];
2297
2298 mutex_lock(&vcpu->mutex);
2299
2300 if (vcpu->vmcs) {
2301 mutex_unlock(&vcpu->mutex);
2302 return -EEXIST;
2303 }
2304
2305 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2306 r = -ENOMEM;
2307 if (!page)
2308 goto out_unlock;
2309 vcpu->run = page_address(page);
2310
2311 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2312 r = -ENOMEM;
2313 if (!page)
2314 goto out_free_run;
2315 vcpu->pio_data = page_address(page);
2316
2317 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
2318 FX_IMAGE_ALIGN);
2319 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
2320 vcpu->cr0 = 0x10;
2321
2322 r = kvm_arch_ops->vcpu_create(vcpu);
2323 if (r < 0)
2324 goto out_free_vcpus;
2325
2326 r = kvm_mmu_create(vcpu);
2327 if (r < 0)
2328 goto out_free_vcpus;
2329
2330 kvm_arch_ops->vcpu_load(vcpu);
2331 r = kvm_mmu_setup(vcpu);
2332 if (r >= 0)
2333 r = kvm_arch_ops->vcpu_setup(vcpu);
2334 vcpu_put(vcpu);
2335
2336 if (r < 0)
2337 goto out_free_vcpus;
2338
2339 r = create_vcpu_fd(vcpu);
2340 if (r < 0)
2341 goto out_free_vcpus;
2342
2343 return r;
2344
2345 out_free_vcpus:
2346 kvm_free_vcpu(vcpu);
2347 out_free_run:
2348 free_page((unsigned long)vcpu->run);
2349 vcpu->run = NULL;
2350 out_unlock:
2351 mutex_unlock(&vcpu->mutex);
2352 out:
2353 return r;
2354 }
2355
2356 static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
2357 struct kvm_cpuid *cpuid,
2358 struct kvm_cpuid_entry __user *entries)
2359 {
2360 int r;
2361
2362 r = -E2BIG;
2363 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2364 goto out;
2365 r = -EFAULT;
2366 if (copy_from_user(&vcpu->cpuid_entries, entries,
2367 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
2368 goto out;
2369 vcpu->cpuid_nent = cpuid->nent;
2370 return 0;
2371
2372 out:
2373 return r;
2374 }
2375
2376 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2377 {
2378 if (sigset) {
2379 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2380 vcpu->sigset_active = 1;
2381 vcpu->sigset = *sigset;
2382 } else
2383 vcpu->sigset_active = 0;
2384 return 0;
2385 }
2386
2387 /*
2388 * fxsave fpu state. Taken from x86_64/processor.h. To be killed when
2389 * we have asm/x86/processor.h
2390 */
2391 struct fxsave {
2392 u16 cwd;
2393 u16 swd;
2394 u16 twd;
2395 u16 fop;
2396 u64 rip;
2397 u64 rdp;
2398 u32 mxcsr;
2399 u32 mxcsr_mask;
2400 u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
2401 #ifdef CONFIG_X86_64
2402 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
2403 #else
2404 u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
2405 #endif
2406 };
2407
2408 static int kvm_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2409 {
2410 struct fxsave *fxsave = (struct fxsave *)vcpu->guest_fx_image;
2411
2412 vcpu_load(vcpu);
2413
2414 memcpy(fpu->fpr, fxsave->st_space, 128);
2415 fpu->fcw = fxsave->cwd;
2416 fpu->fsw = fxsave->swd;
2417 fpu->ftwx = fxsave->twd;
2418 fpu->last_opcode = fxsave->fop;
2419 fpu->last_ip = fxsave->rip;
2420 fpu->last_dp = fxsave->rdp;
2421 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
2422
2423 vcpu_put(vcpu);
2424
2425 return 0;
2426 }
2427
2428 static int kvm_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2429 {
2430 struct fxsave *fxsave = (struct fxsave *)vcpu->guest_fx_image;
2431
2432 vcpu_load(vcpu);
2433
2434 memcpy(fxsave->st_space, fpu->fpr, 128);
2435 fxsave->cwd = fpu->fcw;
2436 fxsave->swd = fpu->fsw;
2437 fxsave->twd = fpu->ftwx;
2438 fxsave->fop = fpu->last_opcode;
2439 fxsave->rip = fpu->last_ip;
2440 fxsave->rdp = fpu->last_dp;
2441 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
2442
2443 vcpu_put(vcpu);
2444
2445 return 0;
2446 }
2447
2448 static long kvm_vcpu_ioctl(struct file *filp,
2449 unsigned int ioctl, unsigned long arg)
2450 {
2451 struct kvm_vcpu *vcpu = filp->private_data;
2452 void __user *argp = (void __user *)arg;
2453 int r = -EINVAL;
2454
2455 switch (ioctl) {
2456 case KVM_RUN:
2457 r = -EINVAL;
2458 if (arg)
2459 goto out;
2460 r = kvm_vcpu_ioctl_run(vcpu, vcpu->run);
2461 break;
2462 case KVM_GET_REGS: {
2463 struct kvm_regs kvm_regs;
2464
2465 memset(&kvm_regs, 0, sizeof kvm_regs);
2466 r = kvm_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
2467 if (r)
2468 goto out;
2469 r = -EFAULT;
2470 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
2471 goto out;
2472 r = 0;
2473 break;
2474 }
2475 case KVM_SET_REGS: {
2476 struct kvm_regs kvm_regs;
2477
2478 r = -EFAULT;
2479 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
2480 goto out;
2481 r = kvm_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
2482 if (r)
2483 goto out;
2484 r = 0;
2485 break;
2486 }
2487 case KVM_GET_SREGS: {
2488 struct kvm_sregs kvm_sregs;
2489
2490 memset(&kvm_sregs, 0, sizeof kvm_sregs);
2491 r = kvm_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
2492 if (r)
2493 goto out;
2494 r = -EFAULT;
2495 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
2496 goto out;
2497 r = 0;
2498 break;
2499 }
2500 case KVM_SET_SREGS: {
2501 struct kvm_sregs kvm_sregs;
2502
2503 r = -EFAULT;
2504 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
2505 goto out;
2506 r = kvm_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
2507 if (r)
2508 goto out;
2509 r = 0;
2510 break;
2511 }
2512 case KVM_TRANSLATE: {
2513 struct kvm_translation tr;
2514
2515 r = -EFAULT;
2516 if (copy_from_user(&tr, argp, sizeof tr))
2517 goto out;
2518 r = kvm_vcpu_ioctl_translate(vcpu, &tr);
2519 if (r)
2520 goto out;
2521 r = -EFAULT;
2522 if (copy_to_user(argp, &tr, sizeof tr))
2523 goto out;
2524 r = 0;
2525 break;
2526 }
2527 case KVM_INTERRUPT: {
2528 struct kvm_interrupt irq;
2529
2530 r = -EFAULT;
2531 if (copy_from_user(&irq, argp, sizeof irq))
2532 goto out;
2533 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
2534 if (r)
2535 goto out;
2536 r = 0;
2537 break;
2538 }
2539 case KVM_DEBUG_GUEST: {
2540 struct kvm_debug_guest dbg;
2541
2542 r = -EFAULT;
2543 if (copy_from_user(&dbg, argp, sizeof dbg))
2544 goto out;
2545 r = kvm_vcpu_ioctl_debug_guest(vcpu, &dbg);
2546 if (r)
2547 goto out;
2548 r = 0;
2549 break;
2550 }
2551 case KVM_GET_MSRS:
2552 r = msr_io(vcpu, argp, get_msr, 1);
2553 break;
2554 case KVM_SET_MSRS:
2555 r = msr_io(vcpu, argp, do_set_msr, 0);
2556 break;
2557 case KVM_SET_CPUID: {
2558 struct kvm_cpuid __user *cpuid_arg = argp;
2559 struct kvm_cpuid cpuid;
2560
2561 r = -EFAULT;
2562 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2563 goto out;
2564 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
2565 if (r)
2566 goto out;
2567 break;
2568 }
2569 case KVM_SET_SIGNAL_MASK: {
2570 struct kvm_signal_mask __user *sigmask_arg = argp;
2571 struct kvm_signal_mask kvm_sigmask;
2572 sigset_t sigset, *p;
2573
2574 p = NULL;
2575 if (argp) {
2576 r = -EFAULT;
2577 if (copy_from_user(&kvm_sigmask, argp,
2578 sizeof kvm_sigmask))
2579 goto out;
2580 r = -EINVAL;
2581 if (kvm_sigmask.len != sizeof sigset)
2582 goto out;
2583 r = -EFAULT;
2584 if (copy_from_user(&sigset, sigmask_arg->sigset,
2585 sizeof sigset))
2586 goto out;
2587 p = &sigset;
2588 }
2589 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2590 break;
2591 }
2592 case KVM_GET_FPU: {
2593 struct kvm_fpu fpu;
2594
2595 memset(&fpu, 0, sizeof fpu);
2596 r = kvm_vcpu_ioctl_get_fpu(vcpu, &fpu);
2597 if (r)
2598 goto out;
2599 r = -EFAULT;
2600 if (copy_to_user(argp, &fpu, sizeof fpu))
2601 goto out;
2602 r = 0;
2603 break;
2604 }
2605 case KVM_SET_FPU: {
2606 struct kvm_fpu fpu;
2607
2608 r = -EFAULT;
2609 if (copy_from_user(&fpu, argp, sizeof fpu))
2610 goto out;
2611 r = kvm_vcpu_ioctl_set_fpu(vcpu, &fpu);
2612 if (r)
2613 goto out;
2614 r = 0;
2615 break;
2616 }
2617 default:
2618 ;
2619 }
2620 out:
2621 return r;
2622 }
2623
2624 static long kvm_vm_ioctl(struct file *filp,
2625 unsigned int ioctl, unsigned long arg)
2626 {
2627 struct kvm *kvm = filp->private_data;
2628 void __user *argp = (void __user *)arg;
2629 int r = -EINVAL;
2630
2631 switch (ioctl) {
2632 case KVM_CREATE_VCPU:
2633 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2634 if (r < 0)
2635 goto out;
2636 break;
2637 case KVM_SET_MEMORY_REGION: {
2638 struct kvm_memory_region kvm_mem;
2639
2640 r = -EFAULT;
2641 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
2642 goto out;
2643 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_mem);
2644 if (r)
2645 goto out;
2646 break;
2647 }
2648 case KVM_GET_DIRTY_LOG: {
2649 struct kvm_dirty_log log;
2650
2651 r = -EFAULT;
2652 if (copy_from_user(&log, argp, sizeof log))
2653 goto out;
2654 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2655 if (r)
2656 goto out;
2657 break;
2658 }
2659 case KVM_SET_MEMORY_ALIAS: {
2660 struct kvm_memory_alias alias;
2661
2662 r = -EFAULT;
2663 if (copy_from_user(&alias, argp, sizeof alias))
2664 goto out;
2665 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
2666 if (r)
2667 goto out;
2668 break;
2669 }
2670 default:
2671 ;
2672 }
2673 out:
2674 return r;
2675 }
2676
2677 static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
2678 unsigned long address,
2679 int *type)
2680 {
2681 struct kvm *kvm = vma->vm_file->private_data;
2682 unsigned long pgoff;
2683 struct page *page;
2684
2685 *type = VM_FAULT_MINOR;
2686 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
2687 page = gfn_to_page(kvm, pgoff);
2688 if (!page)
2689 return NOPAGE_SIGBUS;
2690 get_page(page);
2691 return page;
2692 }
2693
2694 static struct vm_operations_struct kvm_vm_vm_ops = {
2695 .nopage = kvm_vm_nopage,
2696 };
2697
2698 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2699 {
2700 vma->vm_ops = &kvm_vm_vm_ops;
2701 return 0;
2702 }
2703
2704 static struct file_operations kvm_vm_fops = {
2705 .release = kvm_vm_release,
2706 .unlocked_ioctl = kvm_vm_ioctl,
2707 .compat_ioctl = kvm_vm_ioctl,
2708 .mmap = kvm_vm_mmap,
2709 };
2710
2711 static int kvm_dev_ioctl_create_vm(void)
2712 {
2713 int fd, r;
2714 struct inode *inode;
2715 struct file *file;
2716 struct kvm *kvm;
2717
2718 inode = kvmfs_inode(&kvm_vm_fops);
2719 if (IS_ERR(inode)) {
2720 r = PTR_ERR(inode);
2721 goto out1;
2722 }
2723
2724 kvm = kvm_create_vm();
2725 if (IS_ERR(kvm)) {
2726 r = PTR_ERR(kvm);
2727 goto out2;
2728 }
2729
2730 file = kvmfs_file(inode, kvm);
2731 if (IS_ERR(file)) {
2732 r = PTR_ERR(file);
2733 goto out3;
2734 }
2735 kvm->filp = file;
2736
2737 r = get_unused_fd();
2738 if (r < 0)
2739 goto out4;
2740 fd = r;
2741 fd_install(fd, file);
2742
2743 return fd;
2744
2745 out4:
2746 fput(file);
2747 out3:
2748 kvm_destroy_vm(kvm);
2749 out2:
2750 iput(inode);
2751 out1:
2752 return r;
2753 }
2754
2755 static long kvm_dev_ioctl(struct file *filp,
2756 unsigned int ioctl, unsigned long arg)
2757 {
2758 void __user *argp = (void __user *)arg;
2759 long r = -EINVAL;
2760
2761 switch (ioctl) {
2762 case KVM_GET_API_VERSION:
2763 r = -EINVAL;
2764 if (arg)
2765 goto out;
2766 r = KVM_API_VERSION;
2767 break;
2768 case KVM_CREATE_VM:
2769 r = -EINVAL;
2770 if (arg)
2771 goto out;
2772 r = kvm_dev_ioctl_create_vm();
2773 break;
2774 case KVM_GET_MSR_INDEX_LIST: {
2775 struct kvm_msr_list __user *user_msr_list = argp;
2776 struct kvm_msr_list msr_list;
2777 unsigned n;
2778
2779 r = -EFAULT;
2780 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
2781 goto out;
2782 n = msr_list.nmsrs;
2783 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
2784 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
2785 goto out;
2786 r = -E2BIG;
2787 if (n < num_msrs_to_save)
2788 goto out;
2789 r = -EFAULT;
2790 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
2791 num_msrs_to_save * sizeof(u32)))
2792 goto out;
2793 if (copy_to_user(user_msr_list->indices
2794 + num_msrs_to_save * sizeof(u32),
2795 &emulated_msrs,
2796 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
2797 goto out;
2798 r = 0;
2799 break;
2800 }
2801 case KVM_CHECK_EXTENSION:
2802 /*
2803 * No extensions defined at present.
2804 */
2805 r = 0;
2806 break;
2807 case KVM_GET_VCPU_MMAP_SIZE:
2808 r = -EINVAL;
2809 if (arg)
2810 goto out;
2811 r = 2 * PAGE_SIZE;
2812 break;
2813 default:
2814 ;
2815 }
2816 out:
2817 return r;
2818 }
2819
2820 static struct file_operations kvm_chardev_ops = {
2821 .open = kvm_dev_open,
2822 .release = kvm_dev_release,
2823 .unlocked_ioctl = kvm_dev_ioctl,
2824 .compat_ioctl = kvm_dev_ioctl,
2825 };
2826
2827 static struct miscdevice kvm_dev = {
2828 KVM_MINOR,
2829 "kvm",
2830 &kvm_chardev_ops,
2831 };
2832
2833 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2834 void *v)
2835 {
2836 if (val == SYS_RESTART) {
2837 /*
2838 * Some (well, at least mine) BIOSes hang on reboot if
2839 * in vmx root mode.
2840 */
2841 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2842 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
2843 }
2844 return NOTIFY_OK;
2845 }
2846
2847 static struct notifier_block kvm_reboot_notifier = {
2848 .notifier_call = kvm_reboot,
2849 .priority = 0,
2850 };
2851
2852 /*
2853 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
2854 * cached on it.
2855 */
2856 static void decache_vcpus_on_cpu(int cpu)
2857 {
2858 struct kvm *vm;
2859 struct kvm_vcpu *vcpu;
2860 int i;
2861
2862 spin_lock(&kvm_lock);
2863 list_for_each_entry(vm, &vm_list, vm_list)
2864 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2865 vcpu = &vm->vcpus[i];
2866 /*
2867 * If the vcpu is locked, then it is running on some
2868 * other cpu and therefore it is not cached on the
2869 * cpu in question.
2870 *
2871 * If it's not locked, check the last cpu it executed
2872 * on.
2873 */
2874 if (mutex_trylock(&vcpu->mutex)) {
2875 if (vcpu->cpu == cpu) {
2876 kvm_arch_ops->vcpu_decache(vcpu);
2877 vcpu->cpu = -1;
2878 }
2879 mutex_unlock(&vcpu->mutex);
2880 }
2881 }
2882 spin_unlock(&kvm_lock);
2883 }
2884
2885 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2886 void *v)
2887 {
2888 int cpu = (long)v;
2889
2890 switch (val) {
2891 case CPU_DOWN_PREPARE:
2892 case CPU_DOWN_PREPARE_FROZEN:
2893 case CPU_UP_CANCELED:
2894 case CPU_UP_CANCELED_FROZEN:
2895 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2896 cpu);
2897 decache_vcpus_on_cpu(cpu);
2898 smp_call_function_single(cpu, kvm_arch_ops->hardware_disable,
2899 NULL, 0, 1);
2900 break;
2901 case CPU_ONLINE:
2902 case CPU_ONLINE_FROZEN:
2903 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2904 cpu);
2905 smp_call_function_single(cpu, kvm_arch_ops->hardware_enable,
2906 NULL, 0, 1);
2907 break;
2908 }
2909 return NOTIFY_OK;
2910 }
2911
2912 static struct notifier_block kvm_cpu_notifier = {
2913 .notifier_call = kvm_cpu_hotplug,
2914 .priority = 20, /* must be > scheduler priority */
2915 };
2916
2917 static u64 stat_get(void *_offset)
2918 {
2919 unsigned offset = (long)_offset;
2920 u64 total = 0;
2921 struct kvm *kvm;
2922 struct kvm_vcpu *vcpu;
2923 int i;
2924
2925 spin_lock(&kvm_lock);
2926 list_for_each_entry(kvm, &vm_list, vm_list)
2927 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2928 vcpu = &kvm->vcpus[i];
2929 total += *(u32 *)((void *)vcpu + offset);
2930 }
2931 spin_unlock(&kvm_lock);
2932 return total;
2933 }
2934
2935 static void stat_set(void *offset, u64 val)
2936 {
2937 }
2938
2939 DEFINE_SIMPLE_ATTRIBUTE(stat_fops, stat_get, stat_set, "%llu\n");
2940
2941 static __init void kvm_init_debug(void)
2942 {
2943 struct kvm_stats_debugfs_item *p;
2944
2945 debugfs_dir = debugfs_create_dir("kvm", NULL);
2946 for (p = debugfs_entries; p->name; ++p)
2947 p->dentry = debugfs_create_file(p->name, 0444, debugfs_dir,
2948 (void *)(long)p->offset,
2949 &stat_fops);
2950 }
2951
2952 static void kvm_exit_debug(void)
2953 {
2954 struct kvm_stats_debugfs_item *p;
2955
2956 for (p = debugfs_entries; p->name; ++p)
2957 debugfs_remove(p->dentry);
2958 debugfs_remove(debugfs_dir);
2959 }
2960
2961 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2962 {
2963 decache_vcpus_on_cpu(raw_smp_processor_id());
2964 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
2965 return 0;
2966 }
2967
2968 static int kvm_resume(struct sys_device *dev)
2969 {
2970 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
2971 return 0;
2972 }
2973
2974 static struct sysdev_class kvm_sysdev_class = {
2975 set_kset_name("kvm"),
2976 .suspend = kvm_suspend,
2977 .resume = kvm_resume,
2978 };
2979
2980 static struct sys_device kvm_sysdev = {
2981 .id = 0,
2982 .cls = &kvm_sysdev_class,
2983 };
2984
2985 hpa_t bad_page_address;
2986
2987 static int kvmfs_get_sb(struct file_system_type *fs_type, int flags,
2988 const char *dev_name, void *data, struct vfsmount *mnt)
2989 {
2990 return get_sb_pseudo(fs_type, "kvm:", NULL, KVMFS_SUPER_MAGIC, mnt);
2991 }
2992
2993 static struct file_system_type kvm_fs_type = {
2994 .name = "kvmfs",
2995 .get_sb = kvmfs_get_sb,
2996 .kill_sb = kill_anon_super,
2997 };
2998
2999 int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
3000 {
3001 int r;
3002
3003 if (kvm_arch_ops) {
3004 printk(KERN_ERR "kvm: already loaded the other module\n");
3005 return -EEXIST;
3006 }
3007
3008 if (!ops->cpu_has_kvm_support()) {
3009 printk(KERN_ERR "kvm: no hardware support\n");
3010 return -EOPNOTSUPP;
3011 }
3012 if (ops->disabled_by_bios()) {
3013 printk(KERN_ERR "kvm: disabled by bios\n");
3014 return -EOPNOTSUPP;
3015 }
3016
3017 kvm_arch_ops = ops;
3018
3019 r = kvm_arch_ops->hardware_setup();
3020 if (r < 0)
3021 goto out;
3022
3023 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
3024 r = register_cpu_notifier(&kvm_cpu_notifier);
3025 if (r)
3026 goto out_free_1;
3027 register_reboot_notifier(&kvm_reboot_notifier);
3028
3029 r = sysdev_class_register(&kvm_sysdev_class);
3030 if (r)
3031 goto out_free_2;
3032
3033 r = sysdev_register(&kvm_sysdev);
3034 if (r)
3035 goto out_free_3;
3036
3037 kvm_chardev_ops.owner = module;
3038
3039 r = misc_register(&kvm_dev);
3040 if (r) {
3041 printk (KERN_ERR "kvm: misc device register failed\n");
3042 goto out_free;
3043 }
3044
3045 return r;
3046
3047 out_free:
3048 sysdev_unregister(&kvm_sysdev);
3049 out_free_3:
3050 sysdev_class_unregister(&kvm_sysdev_class);
3051 out_free_2:
3052 unregister_reboot_notifier(&kvm_reboot_notifier);
3053 unregister_cpu_notifier(&kvm_cpu_notifier);
3054 out_free_1:
3055 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
3056 kvm_arch_ops->hardware_unsetup();
3057 out:
3058 kvm_arch_ops = NULL;
3059 return r;
3060 }
3061
3062 void kvm_exit_arch(void)
3063 {
3064 misc_deregister(&kvm_dev);
3065 sysdev_unregister(&kvm_sysdev);
3066 sysdev_class_unregister(&kvm_sysdev_class);
3067 unregister_reboot_notifier(&kvm_reboot_notifier);
3068 unregister_cpu_notifier(&kvm_cpu_notifier);
3069 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
3070 kvm_arch_ops->hardware_unsetup();
3071 kvm_arch_ops = NULL;
3072 }
3073
3074 static __init int kvm_init(void)
3075 {
3076 static struct page *bad_page;
3077 int r;
3078
3079 r = kvm_mmu_module_init();
3080 if (r)
3081 goto out4;
3082
3083 r = register_filesystem(&kvm_fs_type);
3084 if (r)
3085 goto out3;
3086
3087 kvmfs_mnt = kern_mount(&kvm_fs_type);
3088 r = PTR_ERR(kvmfs_mnt);
3089 if (IS_ERR(kvmfs_mnt))
3090 goto out2;
3091 kvm_init_debug();
3092
3093 kvm_init_msr_list();
3094
3095 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
3096 r = -ENOMEM;
3097 goto out;
3098 }
3099
3100 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
3101 memset(__va(bad_page_address), 0, PAGE_SIZE);
3102
3103 return 0;
3104
3105 out:
3106 kvm_exit_debug();
3107 mntput(kvmfs_mnt);
3108 out2:
3109 unregister_filesystem(&kvm_fs_type);
3110 out3:
3111 kvm_mmu_module_exit();
3112 out4:
3113 return r;
3114 }
3115
3116 static __exit void kvm_exit(void)
3117 {
3118 kvm_exit_debug();
3119 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
3120 mntput(kvmfs_mnt);
3121 unregister_filesystem(&kvm_fs_type);
3122 kvm_mmu_module_exit();
3123 }
3124
3125 module_init(kvm_init)
3126 module_exit(kvm_exit)
3127
3128 EXPORT_SYMBOL_GPL(kvm_init_arch);
3129 EXPORT_SYMBOL_GPL(kvm_exit_arch);
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