xref: /linux/arch/x86/include/asm/kvm_host.h (revision c145211d1f9e2ef19e7b4c2b943f68366daa97af)
1 /*
2  * Kernel-based Virtual Machine driver for Linux
3  *
4  * This header defines architecture specific interfaces, x86 version
5  *
6  * This work is licensed under the terms of the GNU GPL, version 2.  See
7  * the COPYING file in the top-level directory.
8  *
9  */
10 
11 #ifndef _ASM_X86_KVM_HOST_H
12 #define _ASM_X86_KVM_HOST_H
13 
14 #include <linux/types.h>
15 #include <linux/mm.h>
16 #include <linux/mmu_notifier.h>
17 #include <linux/tracepoint.h>
18 
19 #include <linux/kvm.h>
20 #include <linux/kvm_para.h>
21 #include <linux/kvm_types.h>
22 
23 #include <asm/pvclock-abi.h>
24 #include <asm/desc.h>
25 #include <asm/mtrr.h>
26 #include <asm/msr-index.h>
27 
28 #define KVM_MAX_VCPUS 64
29 #define KVM_MEMORY_SLOTS 32
30 /* memory slots that does not exposed to userspace */
31 #define KVM_PRIVATE_MEM_SLOTS 4
32 
33 #define KVM_PIO_PAGE_OFFSET 1
34 #define KVM_COALESCED_MMIO_PAGE_OFFSET 2
35 
36 #define CR3_PAE_RESERVED_BITS ((X86_CR3_PWT | X86_CR3_PCD) - 1)
37 #define CR3_NONPAE_RESERVED_BITS ((PAGE_SIZE-1) & ~(X86_CR3_PWT | X86_CR3_PCD))
38 #define CR3_L_MODE_RESERVED_BITS (CR3_NONPAE_RESERVED_BITS |	\
39 				  0xFFFFFF0000000000ULL)
40 
41 #define INVALID_PAGE (~(hpa_t)0)
42 #define UNMAPPED_GVA (~(gpa_t)0)
43 
44 /* KVM Hugepage definitions for x86 */
45 #define KVM_NR_PAGE_SIZES	3
46 #define KVM_HPAGE_SHIFT(x)	(PAGE_SHIFT + (((x) - 1) * 9))
47 #define KVM_HPAGE_SIZE(x)	(1UL << KVM_HPAGE_SHIFT(x))
48 #define KVM_HPAGE_MASK(x)	(~(KVM_HPAGE_SIZE(x) - 1))
49 #define KVM_PAGES_PER_HPAGE(x)	(KVM_HPAGE_SIZE(x) / PAGE_SIZE)
50 
51 #define DE_VECTOR 0
52 #define DB_VECTOR 1
53 #define BP_VECTOR 3
54 #define OF_VECTOR 4
55 #define BR_VECTOR 5
56 #define UD_VECTOR 6
57 #define NM_VECTOR 7
58 #define DF_VECTOR 8
59 #define TS_VECTOR 10
60 #define NP_VECTOR 11
61 #define SS_VECTOR 12
62 #define GP_VECTOR 13
63 #define PF_VECTOR 14
64 #define MF_VECTOR 16
65 #define MC_VECTOR 18
66 
67 #define SELECTOR_TI_MASK (1 << 2)
68 #define SELECTOR_RPL_MASK 0x03
69 
70 #define IOPL_SHIFT 12
71 
72 #define KVM_ALIAS_SLOTS 4
73 
74 #define KVM_PERMILLE_MMU_PAGES 20
75 #define KVM_MIN_ALLOC_MMU_PAGES 64
76 #define KVM_MMU_HASH_SHIFT 10
77 #define KVM_NUM_MMU_PAGES (1 << KVM_MMU_HASH_SHIFT)
78 #define KVM_MIN_FREE_MMU_PAGES 5
79 #define KVM_REFILL_PAGES 25
80 #define KVM_MAX_CPUID_ENTRIES 40
81 #define KVM_NR_FIXED_MTRR_REGION 88
82 #define KVM_NR_VAR_MTRR 8
83 
84 extern spinlock_t kvm_lock;
85 extern struct list_head vm_list;
86 
87 struct kvm_vcpu;
88 struct kvm;
89 
90 enum kvm_reg {
91 	VCPU_REGS_RAX = 0,
92 	VCPU_REGS_RCX = 1,
93 	VCPU_REGS_RDX = 2,
94 	VCPU_REGS_RBX = 3,
95 	VCPU_REGS_RSP = 4,
96 	VCPU_REGS_RBP = 5,
97 	VCPU_REGS_RSI = 6,
98 	VCPU_REGS_RDI = 7,
99 #ifdef CONFIG_X86_64
100 	VCPU_REGS_R8 = 8,
101 	VCPU_REGS_R9 = 9,
102 	VCPU_REGS_R10 = 10,
103 	VCPU_REGS_R11 = 11,
104 	VCPU_REGS_R12 = 12,
105 	VCPU_REGS_R13 = 13,
106 	VCPU_REGS_R14 = 14,
107 	VCPU_REGS_R15 = 15,
108 #endif
109 	VCPU_REGS_RIP,
110 	NR_VCPU_REGS
111 };
112 
113 enum kvm_reg_ex {
114 	VCPU_EXREG_PDPTR = NR_VCPU_REGS,
115 };
116 
117 enum {
118 	VCPU_SREG_ES,
119 	VCPU_SREG_CS,
120 	VCPU_SREG_SS,
121 	VCPU_SREG_DS,
122 	VCPU_SREG_FS,
123 	VCPU_SREG_GS,
124 	VCPU_SREG_TR,
125 	VCPU_SREG_LDTR,
126 };
127 
128 #include <asm/kvm_emulate.h>
129 
130 #define KVM_NR_MEM_OBJS 40
131 
132 #define KVM_NR_DB_REGS	4
133 
134 #define DR6_BD		(1 << 13)
135 #define DR6_BS		(1 << 14)
136 #define DR6_FIXED_1	0xffff0ff0
137 #define DR6_VOLATILE	0x0000e00f
138 
139 #define DR7_BP_EN_MASK	0x000000ff
140 #define DR7_GE		(1 << 9)
141 #define DR7_GD		(1 << 13)
142 #define DR7_FIXED_1	0x00000400
143 #define DR7_VOLATILE	0xffff23ff
144 
145 /*
146  * We don't want allocation failures within the mmu code, so we preallocate
147  * enough memory for a single page fault in a cache.
148  */
149 struct kvm_mmu_memory_cache {
150 	int nobjs;
151 	void *objects[KVM_NR_MEM_OBJS];
152 };
153 
154 #define NR_PTE_CHAIN_ENTRIES 5
155 
156 struct kvm_pte_chain {
157 	u64 *parent_ptes[NR_PTE_CHAIN_ENTRIES];
158 	struct hlist_node link;
159 };
160 
161 /*
162  * kvm_mmu_page_role, below, is defined as:
163  *
164  *   bits 0:3 - total guest paging levels (2-4, or zero for real mode)
165  *   bits 4:7 - page table level for this shadow (1-4)
166  *   bits 8:9 - page table quadrant for 2-level guests
167  *   bit   16 - direct mapping of virtual to physical mapping at gfn
168  *              used for real mode and two-dimensional paging
169  *   bits 17:19 - common access permissions for all ptes in this shadow page
170  */
171 union kvm_mmu_page_role {
172 	unsigned word;
173 	struct {
174 		unsigned glevels:4;
175 		unsigned level:4;
176 		unsigned quadrant:2;
177 		unsigned pad_for_nice_hex_output:6;
178 		unsigned direct:1;
179 		unsigned access:3;
180 		unsigned invalid:1;
181 		unsigned cr4_pge:1;
182 		unsigned nxe:1;
183 	};
184 };
185 
186 struct kvm_mmu_page {
187 	struct list_head link;
188 	struct hlist_node hash_link;
189 
190 	struct list_head oos_link;
191 
192 	/*
193 	 * The following two entries are used to key the shadow page in the
194 	 * hash table.
195 	 */
196 	gfn_t gfn;
197 	union kvm_mmu_page_role role;
198 
199 	u64 *spt;
200 	/* hold the gfn of each spte inside spt */
201 	gfn_t *gfns;
202 	/*
203 	 * One bit set per slot which has memory
204 	 * in this shadow page.
205 	 */
206 	DECLARE_BITMAP(slot_bitmap, KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS);
207 	int multimapped;         /* More than one parent_pte? */
208 	int root_count;          /* Currently serving as active root */
209 	bool unsync;
210 	unsigned int unsync_children;
211 	union {
212 		u64 *parent_pte;               /* !multimapped */
213 		struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
214 	};
215 	DECLARE_BITMAP(unsync_child_bitmap, 512);
216 };
217 
218 struct kvm_pv_mmu_op_buffer {
219 	void *ptr;
220 	unsigned len;
221 	unsigned processed;
222 	char buf[512] __aligned(sizeof(long));
223 };
224 
225 struct kvm_pio_request {
226 	unsigned long count;
227 	int cur_count;
228 	gva_t guest_gva;
229 	int in;
230 	int port;
231 	int size;
232 	int string;
233 	int down;
234 	int rep;
235 };
236 
237 /*
238  * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
239  * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
240  * mode.
241  */
242 struct kvm_mmu {
243 	void (*new_cr3)(struct kvm_vcpu *vcpu);
244 	int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err);
245 	void (*free)(struct kvm_vcpu *vcpu);
246 	gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva, u32 access,
247 			    u32 *error);
248 	void (*prefetch_page)(struct kvm_vcpu *vcpu,
249 			      struct kvm_mmu_page *page);
250 	int (*sync_page)(struct kvm_vcpu *vcpu,
251 			 struct kvm_mmu_page *sp);
252 	void (*invlpg)(struct kvm_vcpu *vcpu, gva_t gva);
253 	hpa_t root_hpa;
254 	int root_level;
255 	int shadow_root_level;
256 	union kvm_mmu_page_role base_role;
257 
258 	u64 *pae_root;
259 	u64 rsvd_bits_mask[2][4];
260 };
261 
262 struct kvm_vcpu_arch {
263 	u64 host_tsc;
264 	/*
265 	 * rip and regs accesses must go through
266 	 * kvm_{register,rip}_{read,write} functions.
267 	 */
268 	unsigned long regs[NR_VCPU_REGS];
269 	u32 regs_avail;
270 	u32 regs_dirty;
271 
272 	unsigned long cr0;
273 	unsigned long cr0_guest_owned_bits;
274 	unsigned long cr2;
275 	unsigned long cr3;
276 	unsigned long cr4;
277 	unsigned long cr4_guest_owned_bits;
278 	unsigned long cr8;
279 	u32 hflags;
280 	u64 pdptrs[4]; /* pae */
281 	u64 efer;
282 	u64 apic_base;
283 	struct kvm_lapic *apic;    /* kernel irqchip context */
284 	int32_t apic_arb_prio;
285 	int mp_state;
286 	int sipi_vector;
287 	u64 ia32_misc_enable_msr;
288 	bool tpr_access_reporting;
289 
290 	struct kvm_mmu mmu;
291 	/* only needed in kvm_pv_mmu_op() path, but it's hot so
292 	 * put it here to avoid allocation */
293 	struct kvm_pv_mmu_op_buffer mmu_op_buffer;
294 
295 	struct kvm_mmu_memory_cache mmu_pte_chain_cache;
296 	struct kvm_mmu_memory_cache mmu_rmap_desc_cache;
297 	struct kvm_mmu_memory_cache mmu_page_cache;
298 	struct kvm_mmu_memory_cache mmu_page_header_cache;
299 
300 	gfn_t last_pt_write_gfn;
301 	int   last_pt_write_count;
302 	u64  *last_pte_updated;
303 	gfn_t last_pte_gfn;
304 
305 	struct {
306 		gfn_t gfn;	/* presumed gfn during guest pte update */
307 		pfn_t pfn;	/* pfn corresponding to that gfn */
308 		unsigned long mmu_seq;
309 	} update_pte;
310 
311 	struct i387_fxsave_struct host_fx_image;
312 	struct i387_fxsave_struct guest_fx_image;
313 
314 	gva_t mmio_fault_cr2;
315 	struct kvm_pio_request pio;
316 	void *pio_data;
317 
318 	u8 event_exit_inst_len;
319 
320 	struct kvm_queued_exception {
321 		bool pending;
322 		bool has_error_code;
323 		u8 nr;
324 		u32 error_code;
325 	} exception;
326 
327 	struct kvm_queued_interrupt {
328 		bool pending;
329 		bool soft;
330 		u8 nr;
331 	} interrupt;
332 
333 	int halt_request; /* real mode on Intel only */
334 
335 	int cpuid_nent;
336 	struct kvm_cpuid_entry2 cpuid_entries[KVM_MAX_CPUID_ENTRIES];
337 	/* emulate context */
338 
339 	struct x86_emulate_ctxt emulate_ctxt;
340 
341 	gpa_t time;
342 	struct pvclock_vcpu_time_info hv_clock;
343 	unsigned int hv_clock_tsc_khz;
344 	unsigned int time_offset;
345 	struct page *time_page;
346 
347 	bool nmi_pending;
348 	bool nmi_injected;
349 
350 	struct mtrr_state_type mtrr_state;
351 	u32 pat;
352 
353 	int switch_db_regs;
354 	unsigned long db[KVM_NR_DB_REGS];
355 	unsigned long dr6;
356 	unsigned long dr7;
357 	unsigned long eff_db[KVM_NR_DB_REGS];
358 
359 	u64 mcg_cap;
360 	u64 mcg_status;
361 	u64 mcg_ctl;
362 	u64 *mce_banks;
363 
364 	/* used for guest single stepping over the given code position */
365 	u16 singlestep_cs;
366 	unsigned long singlestep_rip;
367 	/* fields used by HYPER-V emulation */
368 	u64 hv_vapic;
369 };
370 
371 struct kvm_mem_alias {
372 	gfn_t base_gfn;
373 	unsigned long npages;
374 	gfn_t target_gfn;
375 #define KVM_ALIAS_INVALID     1UL
376 	unsigned long flags;
377 };
378 
379 #define KVM_ARCH_HAS_UNALIAS_INSTANTIATION
380 
381 struct kvm_mem_aliases {
382 	struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
383 	int naliases;
384 };
385 
386 struct kvm_arch {
387 	struct kvm_mem_aliases *aliases;
388 
389 	unsigned int n_free_mmu_pages;
390 	unsigned int n_requested_mmu_pages;
391 	unsigned int n_alloc_mmu_pages;
392 	struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
393 	/*
394 	 * Hash table of struct kvm_mmu_page.
395 	 */
396 	struct list_head active_mmu_pages;
397 	struct list_head assigned_dev_head;
398 	struct iommu_domain *iommu_domain;
399 	int iommu_flags;
400 	struct kvm_pic *vpic;
401 	struct kvm_ioapic *vioapic;
402 	struct kvm_pit *vpit;
403 	int vapics_in_nmi_mode;
404 
405 	unsigned int tss_addr;
406 	struct page *apic_access_page;
407 
408 	gpa_t wall_clock;
409 
410 	struct page *ept_identity_pagetable;
411 	bool ept_identity_pagetable_done;
412 	gpa_t ept_identity_map_addr;
413 
414 	unsigned long irq_sources_bitmap;
415 	u64 vm_init_tsc;
416 	s64 kvmclock_offset;
417 
418 	struct kvm_xen_hvm_config xen_hvm_config;
419 
420 	/* fields used by HYPER-V emulation */
421 	u64 hv_guest_os_id;
422 	u64 hv_hypercall;
423 };
424 
425 struct kvm_vm_stat {
426 	u32 mmu_shadow_zapped;
427 	u32 mmu_pte_write;
428 	u32 mmu_pte_updated;
429 	u32 mmu_pde_zapped;
430 	u32 mmu_flooded;
431 	u32 mmu_recycled;
432 	u32 mmu_cache_miss;
433 	u32 mmu_unsync;
434 	u32 remote_tlb_flush;
435 	u32 lpages;
436 };
437 
438 struct kvm_vcpu_stat {
439 	u32 pf_fixed;
440 	u32 pf_guest;
441 	u32 tlb_flush;
442 	u32 invlpg;
443 
444 	u32 exits;
445 	u32 io_exits;
446 	u32 mmio_exits;
447 	u32 signal_exits;
448 	u32 irq_window_exits;
449 	u32 nmi_window_exits;
450 	u32 halt_exits;
451 	u32 halt_wakeup;
452 	u32 request_irq_exits;
453 	u32 irq_exits;
454 	u32 host_state_reload;
455 	u32 efer_reload;
456 	u32 fpu_reload;
457 	u32 insn_emulation;
458 	u32 insn_emulation_fail;
459 	u32 hypercalls;
460 	u32 irq_injections;
461 	u32 nmi_injections;
462 };
463 
464 struct descriptor_table {
465 	u16 limit;
466 	unsigned long base;
467 } __attribute__((packed));
468 
469 struct kvm_x86_ops {
470 	int (*cpu_has_kvm_support)(void);          /* __init */
471 	int (*disabled_by_bios)(void);             /* __init */
472 	int (*hardware_enable)(void *dummy);
473 	void (*hardware_disable)(void *dummy);
474 	void (*check_processor_compatibility)(void *rtn);
475 	int (*hardware_setup)(void);               /* __init */
476 	void (*hardware_unsetup)(void);            /* __exit */
477 	bool (*cpu_has_accelerated_tpr)(void);
478 	void (*cpuid_update)(struct kvm_vcpu *vcpu);
479 
480 	/* Create, but do not attach this VCPU */
481 	struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
482 	void (*vcpu_free)(struct kvm_vcpu *vcpu);
483 	int (*vcpu_reset)(struct kvm_vcpu *vcpu);
484 
485 	void (*prepare_guest_switch)(struct kvm_vcpu *vcpu);
486 	void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
487 	void (*vcpu_put)(struct kvm_vcpu *vcpu);
488 
489 	void (*set_guest_debug)(struct kvm_vcpu *vcpu,
490 				struct kvm_guest_debug *dbg);
491 	int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
492 	int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
493 	u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
494 	void (*get_segment)(struct kvm_vcpu *vcpu,
495 			    struct kvm_segment *var, int seg);
496 	int (*get_cpl)(struct kvm_vcpu *vcpu);
497 	void (*set_segment)(struct kvm_vcpu *vcpu,
498 			    struct kvm_segment *var, int seg);
499 	void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
500 	void (*decache_cr0_guest_bits)(struct kvm_vcpu *vcpu);
501 	void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
502 	void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
503 	void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
504 	void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
505 	void (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
506 	void (*get_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
507 	void (*set_idt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
508 	void (*get_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
509 	void (*set_gdt)(struct kvm_vcpu *vcpu, struct descriptor_table *dt);
510 	int (*get_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long *dest);
511 	int (*set_dr)(struct kvm_vcpu *vcpu, int dr, unsigned long value);
512 	void (*cache_reg)(struct kvm_vcpu *vcpu, enum kvm_reg reg);
513 	unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
514 	void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
515 	void (*fpu_activate)(struct kvm_vcpu *vcpu);
516 	void (*fpu_deactivate)(struct kvm_vcpu *vcpu);
517 
518 	void (*tlb_flush)(struct kvm_vcpu *vcpu);
519 
520 	void (*run)(struct kvm_vcpu *vcpu);
521 	int (*handle_exit)(struct kvm_vcpu *vcpu);
522 	void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
523 	void (*set_interrupt_shadow)(struct kvm_vcpu *vcpu, int mask);
524 	u32 (*get_interrupt_shadow)(struct kvm_vcpu *vcpu, int mask);
525 	void (*patch_hypercall)(struct kvm_vcpu *vcpu,
526 				unsigned char *hypercall_addr);
527 	void (*set_irq)(struct kvm_vcpu *vcpu);
528 	void (*set_nmi)(struct kvm_vcpu *vcpu);
529 	void (*queue_exception)(struct kvm_vcpu *vcpu, unsigned nr,
530 				bool has_error_code, u32 error_code);
531 	int (*interrupt_allowed)(struct kvm_vcpu *vcpu);
532 	int (*nmi_allowed)(struct kvm_vcpu *vcpu);
533 	bool (*get_nmi_mask)(struct kvm_vcpu *vcpu);
534 	void (*set_nmi_mask)(struct kvm_vcpu *vcpu, bool masked);
535 	void (*enable_nmi_window)(struct kvm_vcpu *vcpu);
536 	void (*enable_irq_window)(struct kvm_vcpu *vcpu);
537 	void (*update_cr8_intercept)(struct kvm_vcpu *vcpu, int tpr, int irr);
538 	int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
539 	int (*get_tdp_level)(void);
540 	u64 (*get_mt_mask)(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio);
541 	int (*get_lpage_level)(void);
542 	bool (*rdtscp_supported)(void);
543 
544 	const struct trace_print_flags *exit_reasons_str;
545 };
546 
547 extern struct kvm_x86_ops *kvm_x86_ops;
548 
549 int kvm_mmu_module_init(void);
550 void kvm_mmu_module_exit(void);
551 
552 void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
553 int kvm_mmu_create(struct kvm_vcpu *vcpu);
554 int kvm_mmu_setup(struct kvm_vcpu *vcpu);
555 void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte);
556 void kvm_mmu_set_base_ptes(u64 base_pte);
557 void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,
558 		u64 dirty_mask, u64 nx_mask, u64 x_mask);
559 
560 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
561 void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
562 void kvm_mmu_zap_all(struct kvm *kvm);
563 unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm);
564 void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages);
565 
566 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
567 
568 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
569 			  const void *val, int bytes);
570 int kvm_pv_mmu_op(struct kvm_vcpu *vcpu, unsigned long bytes,
571 		  gpa_t addr, unsigned long *ret);
572 u8 kvm_get_guest_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn);
573 
574 extern bool tdp_enabled;
575 
576 enum emulation_result {
577 	EMULATE_DONE,       /* no further processing */
578 	EMULATE_DO_MMIO,      /* kvm_run filled with mmio request */
579 	EMULATE_FAIL,         /* can't emulate this instruction */
580 };
581 
582 #define EMULTYPE_NO_DECODE	    (1 << 0)
583 #define EMULTYPE_TRAP_UD	    (1 << 1)
584 #define EMULTYPE_SKIP		    (1 << 2)
585 int emulate_instruction(struct kvm_vcpu *vcpu,
586 			unsigned long cr2, u16 error_code, int emulation_type);
587 void kvm_report_emulation_failure(struct kvm_vcpu *cvpu, const char *context);
588 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
589 void realmode_lidt(struct kvm_vcpu *vcpu, u16 size, unsigned long address);
590 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
591 		   unsigned long *rflags);
592 
593 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr);
594 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
595 		     unsigned long *rflags);
596 void kvm_enable_efer_bits(u64);
597 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data);
598 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
599 
600 struct x86_emulate_ctxt;
601 
602 int kvm_emulate_pio(struct kvm_vcpu *vcpu, int in,
603 		     int size, unsigned port);
604 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, int in,
605 			   int size, unsigned long count, int down,
606 			    gva_t address, int rep, unsigned port);
607 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
608 int kvm_emulate_halt(struct kvm_vcpu *vcpu);
609 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
610 int emulate_clts(struct kvm_vcpu *vcpu);
611 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr,
612 		    unsigned long *dest);
613 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
614 		    unsigned long value);
615 
616 void kvm_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
617 int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector, int seg);
618 
619 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason);
620 
621 void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
622 void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3);
623 void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
624 void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8);
625 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu);
626 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
627 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l);
628 
629 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
630 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
631 
632 unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu);
633 void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags);
634 
635 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr);
636 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
637 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long cr2,
638 			   u32 error_code);
639 bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl);
640 
641 int kvm_pic_set_irq(void *opaque, int irq, int level);
642 
643 void kvm_inject_nmi(struct kvm_vcpu *vcpu);
644 
645 void fx_init(struct kvm_vcpu *vcpu);
646 
647 int emulator_write_emulated(unsigned long addr,
648 			    const void *val,
649 			    unsigned int bytes,
650 			    struct kvm_vcpu *vcpu);
651 
652 unsigned long segment_base(u16 selector);
653 
654 void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu);
655 void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
656 		       const u8 *new, int bytes,
657 		       bool guest_initiated);
658 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
659 void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
660 int kvm_mmu_load(struct kvm_vcpu *vcpu);
661 void kvm_mmu_unload(struct kvm_vcpu *vcpu);
662 void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu);
663 gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva, u32 *error);
664 gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva, u32 *error);
665 gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva, u32 *error);
666 gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva, u32 *error);
667 
668 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
669 
670 int kvm_fix_hypercall(struct kvm_vcpu *vcpu);
671 
672 int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva, u32 error_code);
673 void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva);
674 
675 void kvm_enable_tdp(void);
676 void kvm_disable_tdp(void);
677 
678 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
679 int complete_pio(struct kvm_vcpu *vcpu);
680 bool kvm_check_iopl(struct kvm_vcpu *vcpu);
681 
682 struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn);
683 
684 static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
685 {
686 	struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
687 
688 	return (struct kvm_mmu_page *)page_private(page);
689 }
690 
691 static inline u16 kvm_read_fs(void)
692 {
693 	u16 seg;
694 	asm("mov %%fs, %0" : "=g"(seg));
695 	return seg;
696 }
697 
698 static inline u16 kvm_read_gs(void)
699 {
700 	u16 seg;
701 	asm("mov %%gs, %0" : "=g"(seg));
702 	return seg;
703 }
704 
705 static inline u16 kvm_read_ldt(void)
706 {
707 	u16 ldt;
708 	asm("sldt %0" : "=g"(ldt));
709 	return ldt;
710 }
711 
712 static inline void kvm_load_fs(u16 sel)
713 {
714 	asm("mov %0, %%fs" : : "rm"(sel));
715 }
716 
717 static inline void kvm_load_gs(u16 sel)
718 {
719 	asm("mov %0, %%gs" : : "rm"(sel));
720 }
721 
722 static inline void kvm_load_ldt(u16 sel)
723 {
724 	asm("lldt %0" : : "rm"(sel));
725 }
726 
727 static inline void kvm_get_idt(struct descriptor_table *table)
728 {
729 	asm("sidt %0" : "=m"(*table));
730 }
731 
732 static inline void kvm_get_gdt(struct descriptor_table *table)
733 {
734 	asm("sgdt %0" : "=m"(*table));
735 }
736 
737 static inline unsigned long kvm_read_tr_base(void)
738 {
739 	u16 tr;
740 	asm("str %0" : "=g"(tr));
741 	return segment_base(tr);
742 }
743 
744 #ifdef CONFIG_X86_64
745 static inline unsigned long read_msr(unsigned long msr)
746 {
747 	u64 value;
748 
749 	rdmsrl(msr, value);
750 	return value;
751 }
752 #endif
753 
754 static inline void kvm_fx_save(struct i387_fxsave_struct *image)
755 {
756 	asm("fxsave (%0)":: "r" (image));
757 }
758 
759 static inline void kvm_fx_restore(struct i387_fxsave_struct *image)
760 {
761 	asm("fxrstor (%0)":: "r" (image));
762 }
763 
764 static inline void kvm_fx_finit(void)
765 {
766 	asm("finit");
767 }
768 
769 static inline u32 get_rdx_init_val(void)
770 {
771 	return 0x600; /* P6 family */
772 }
773 
774 static inline void kvm_inject_gp(struct kvm_vcpu *vcpu, u32 error_code)
775 {
776 	kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
777 }
778 
779 #define TSS_IOPB_BASE_OFFSET 0x66
780 #define TSS_BASE_SIZE 0x68
781 #define TSS_IOPB_SIZE (65536 / 8)
782 #define TSS_REDIRECTION_SIZE (256 / 8)
783 #define RMODE_TSS_SIZE							\
784 	(TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)
785 
786 enum {
787 	TASK_SWITCH_CALL = 0,
788 	TASK_SWITCH_IRET = 1,
789 	TASK_SWITCH_JMP = 2,
790 	TASK_SWITCH_GATE = 3,
791 };
792 
793 #define HF_GIF_MASK		(1 << 0)
794 #define HF_HIF_MASK		(1 << 1)
795 #define HF_VINTR_MASK		(1 << 2)
796 #define HF_NMI_MASK		(1 << 3)
797 #define HF_IRET_MASK		(1 << 4)
798 
799 /*
800  * Hardware virtualization extension instructions may fault if a
801  * reboot turns off virtualization while processes are running.
802  * Trap the fault and ignore the instruction if that happens.
803  */
804 asmlinkage void kvm_handle_fault_on_reboot(void);
805 
806 #define __kvm_handle_fault_on_reboot(insn) \
807 	"666: " insn "\n\t" \
808 	".pushsection .fixup, \"ax\" \n" \
809 	"667: \n\t" \
810 	__ASM_SIZE(push) " $666b \n\t"	      \
811 	"jmp kvm_handle_fault_on_reboot \n\t" \
812 	".popsection \n\t" \
813 	".pushsection __ex_table, \"a\" \n\t" \
814 	_ASM_PTR " 666b, 667b \n\t" \
815 	".popsection"
816 
817 #define KVM_ARCH_WANT_MMU_NOTIFIER
818 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
819 int kvm_age_hva(struct kvm *kvm, unsigned long hva);
820 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
821 int cpuid_maxphyaddr(struct kvm_vcpu *vcpu);
822 int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu);
823 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu);
824 int kvm_cpu_get_interrupt(struct kvm_vcpu *v);
825 
826 void kvm_define_shared_msr(unsigned index, u32 msr);
827 void kvm_set_shared_msr(unsigned index, u64 val, u64 mask);
828 
829 #endif /* _ASM_X86_KVM_HOST_H */
830