1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
7 * Authors: Sanjay Lal <sanjayl@kymasys.com>
8 */
9
10 #ifndef __MIPS_KVM_HOST_H__
11 #define __MIPS_KVM_HOST_H__
12
13 #include <linux/cpumask.h>
14 #include <linux/mutex.h>
15 #include <linux/hrtimer.h>
16 #include <linux/interrupt.h>
17 #include <linux/types.h>
18 #include <linux/kvm.h>
19 #include <linux/kvm_types.h>
20 #include <linux/threads.h>
21 #include <linux/spinlock.h>
22
23 #include <asm/asm.h>
24 #include <asm/inst.h>
25 #include <asm/mipsregs.h>
26
27 #include <kvm/iodev.h>
28
29 /* MIPS KVM register ids */
30 #define MIPS_CP0_32(_R, _S) \
31 (KVM_REG_MIPS_CP0 | KVM_REG_SIZE_U32 | (8 * (_R) + (_S)))
32
33 #define MIPS_CP0_64(_R, _S) \
34 (KVM_REG_MIPS_CP0 | KVM_REG_SIZE_U64 | (8 * (_R) + (_S)))
35
36 #define KVM_REG_MIPS_CP0_INDEX MIPS_CP0_32(0, 0)
37 #define KVM_REG_MIPS_CP0_ENTRYLO0 MIPS_CP0_64(2, 0)
38 #define KVM_REG_MIPS_CP0_ENTRYLO1 MIPS_CP0_64(3, 0)
39 #define KVM_REG_MIPS_CP0_CONTEXT MIPS_CP0_64(4, 0)
40 #define KVM_REG_MIPS_CP0_CONTEXTCONFIG MIPS_CP0_32(4, 1)
41 #define KVM_REG_MIPS_CP0_USERLOCAL MIPS_CP0_64(4, 2)
42 #define KVM_REG_MIPS_CP0_XCONTEXTCONFIG MIPS_CP0_64(4, 3)
43 #define KVM_REG_MIPS_CP0_PAGEMASK MIPS_CP0_32(5, 0)
44 #define KVM_REG_MIPS_CP0_PAGEGRAIN MIPS_CP0_32(5, 1)
45 #define KVM_REG_MIPS_CP0_SEGCTL0 MIPS_CP0_64(5, 2)
46 #define KVM_REG_MIPS_CP0_SEGCTL1 MIPS_CP0_64(5, 3)
47 #define KVM_REG_MIPS_CP0_SEGCTL2 MIPS_CP0_64(5, 4)
48 #define KVM_REG_MIPS_CP0_PWBASE MIPS_CP0_64(5, 5)
49 #define KVM_REG_MIPS_CP0_PWFIELD MIPS_CP0_64(5, 6)
50 #define KVM_REG_MIPS_CP0_PWSIZE MIPS_CP0_64(5, 7)
51 #define KVM_REG_MIPS_CP0_WIRED MIPS_CP0_32(6, 0)
52 #define KVM_REG_MIPS_CP0_PWCTL MIPS_CP0_32(6, 6)
53 #define KVM_REG_MIPS_CP0_HWRENA MIPS_CP0_32(7, 0)
54 #define KVM_REG_MIPS_CP0_BADVADDR MIPS_CP0_64(8, 0)
55 #define KVM_REG_MIPS_CP0_BADINSTR MIPS_CP0_32(8, 1)
56 #define KVM_REG_MIPS_CP0_BADINSTRP MIPS_CP0_32(8, 2)
57 #define KVM_REG_MIPS_CP0_COUNT MIPS_CP0_32(9, 0)
58 #define KVM_REG_MIPS_CP0_ENTRYHI MIPS_CP0_64(10, 0)
59 #define KVM_REG_MIPS_CP0_COMPARE MIPS_CP0_32(11, 0)
60 #define KVM_REG_MIPS_CP0_STATUS MIPS_CP0_32(12, 0)
61 #define KVM_REG_MIPS_CP0_INTCTL MIPS_CP0_32(12, 1)
62 #define KVM_REG_MIPS_CP0_CAUSE MIPS_CP0_32(13, 0)
63 #define KVM_REG_MIPS_CP0_EPC MIPS_CP0_64(14, 0)
64 #define KVM_REG_MIPS_CP0_PRID MIPS_CP0_32(15, 0)
65 #define KVM_REG_MIPS_CP0_EBASE MIPS_CP0_64(15, 1)
66 #define KVM_REG_MIPS_CP0_CONFIG MIPS_CP0_32(16, 0)
67 #define KVM_REG_MIPS_CP0_CONFIG1 MIPS_CP0_32(16, 1)
68 #define KVM_REG_MIPS_CP0_CONFIG2 MIPS_CP0_32(16, 2)
69 #define KVM_REG_MIPS_CP0_CONFIG3 MIPS_CP0_32(16, 3)
70 #define KVM_REG_MIPS_CP0_CONFIG4 MIPS_CP0_32(16, 4)
71 #define KVM_REG_MIPS_CP0_CONFIG5 MIPS_CP0_32(16, 5)
72 #define KVM_REG_MIPS_CP0_CONFIG6 MIPS_CP0_32(16, 6)
73 #define KVM_REG_MIPS_CP0_CONFIG7 MIPS_CP0_32(16, 7)
74 #define KVM_REG_MIPS_CP0_MAARI MIPS_CP0_64(17, 2)
75 #define KVM_REG_MIPS_CP0_XCONTEXT MIPS_CP0_64(20, 0)
76 #define KVM_REG_MIPS_CP0_DIAG MIPS_CP0_32(22, 0)
77 #define KVM_REG_MIPS_CP0_ERROREPC MIPS_CP0_64(30, 0)
78 #define KVM_REG_MIPS_CP0_KSCRATCH1 MIPS_CP0_64(31, 2)
79 #define KVM_REG_MIPS_CP0_KSCRATCH2 MIPS_CP0_64(31, 3)
80 #define KVM_REG_MIPS_CP0_KSCRATCH3 MIPS_CP0_64(31, 4)
81 #define KVM_REG_MIPS_CP0_KSCRATCH4 MIPS_CP0_64(31, 5)
82 #define KVM_REG_MIPS_CP0_KSCRATCH5 MIPS_CP0_64(31, 6)
83 #define KVM_REG_MIPS_CP0_KSCRATCH6 MIPS_CP0_64(31, 7)
84
85
86 #define KVM_MAX_VCPUS 16
87
88 #define KVM_HALT_POLL_NS_DEFAULT 500000
89
90 extern unsigned long GUESTID_MASK;
91 extern unsigned long GUESTID_FIRST_VERSION;
92 extern unsigned long GUESTID_VERSION_MASK;
93
94 #define KVM_INVALID_ADDR 0xdeadbeef
95
96 /*
97 * EVA has overlapping user & kernel address spaces, so user VAs may be >
98 * PAGE_OFFSET. For this reason we can't use the default KVM_HVA_ERR_BAD of
99 * PAGE_OFFSET.
100 */
101
102 #define KVM_HVA_ERR_BAD (-1UL)
103 #define KVM_HVA_ERR_RO_BAD (-2UL)
104
kvm_is_error_hva(unsigned long addr)105 static inline bool kvm_is_error_hva(unsigned long addr)
106 {
107 return IS_ERR_VALUE(addr);
108 }
109
110 struct kvm_vm_stat {
111 struct kvm_vm_stat_generic generic;
112 };
113
114 struct kvm_vcpu_stat {
115 struct kvm_vcpu_stat_generic generic;
116 u64 wait_exits;
117 u64 cache_exits;
118 u64 signal_exits;
119 u64 int_exits;
120 u64 cop_unusable_exits;
121 u64 tlbmod_exits;
122 u64 tlbmiss_ld_exits;
123 u64 tlbmiss_st_exits;
124 u64 addrerr_st_exits;
125 u64 addrerr_ld_exits;
126 u64 syscall_exits;
127 u64 resvd_inst_exits;
128 u64 break_inst_exits;
129 u64 trap_inst_exits;
130 u64 msa_fpe_exits;
131 u64 fpe_exits;
132 u64 msa_disabled_exits;
133 u64 flush_dcache_exits;
134 u64 vz_gpsi_exits;
135 u64 vz_gsfc_exits;
136 u64 vz_hc_exits;
137 u64 vz_grr_exits;
138 u64 vz_gva_exits;
139 u64 vz_ghfc_exits;
140 u64 vz_gpa_exits;
141 u64 vz_resvd_exits;
142 #ifdef CONFIG_CPU_LOONGSON64
143 u64 vz_cpucfg_exits;
144 #endif
145 };
146
147 struct kvm_arch_memory_slot {
148 };
149
150 #ifdef CONFIG_CPU_LOONGSON64
151 struct ipi_state {
152 uint32_t status;
153 uint32_t en;
154 uint32_t set;
155 uint32_t clear;
156 uint64_t buf[4];
157 };
158
159 struct loongson_kvm_ipi;
160
161 struct ipi_io_device {
162 int node_id;
163 struct loongson_kvm_ipi *ipi;
164 struct kvm_io_device device;
165 };
166
167 struct loongson_kvm_ipi {
168 spinlock_t lock;
169 struct kvm *kvm;
170 struct ipi_state ipistate[16];
171 struct ipi_io_device dev_ipi[4];
172 };
173 #endif
174
175 struct kvm_arch {
176 /* Guest physical mm */
177 struct mm_struct gpa_mm;
178 /* Mask of CPUs needing GPA ASID flush */
179 cpumask_t asid_flush_mask;
180 #ifdef CONFIG_CPU_LOONGSON64
181 struct loongson_kvm_ipi ipi;
182 #endif
183 };
184
185 #define N_MIPS_COPROC_REGS 32
186 #define N_MIPS_COPROC_SEL 8
187
188 struct mips_coproc {
189 unsigned long reg[N_MIPS_COPROC_REGS][N_MIPS_COPROC_SEL];
190 #ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS
191 unsigned long stat[N_MIPS_COPROC_REGS][N_MIPS_COPROC_SEL];
192 #endif
193 };
194
195 /*
196 * Coprocessor 0 register names
197 */
198 #define MIPS_CP0_TLB_INDEX 0
199 #define MIPS_CP0_TLB_RANDOM 1
200 #define MIPS_CP0_TLB_LOW 2
201 #define MIPS_CP0_TLB_LO0 2
202 #define MIPS_CP0_TLB_LO1 3
203 #define MIPS_CP0_TLB_CONTEXT 4
204 #define MIPS_CP0_TLB_PG_MASK 5
205 #define MIPS_CP0_TLB_WIRED 6
206 #define MIPS_CP0_HWRENA 7
207 #define MIPS_CP0_BAD_VADDR 8
208 #define MIPS_CP0_COUNT 9
209 #define MIPS_CP0_TLB_HI 10
210 #define MIPS_CP0_COMPARE 11
211 #define MIPS_CP0_STATUS 12
212 #define MIPS_CP0_CAUSE 13
213 #define MIPS_CP0_EXC_PC 14
214 #define MIPS_CP0_PRID 15
215 #define MIPS_CP0_CONFIG 16
216 #define MIPS_CP0_LLADDR 17
217 #define MIPS_CP0_WATCH_LO 18
218 #define MIPS_CP0_WATCH_HI 19
219 #define MIPS_CP0_TLB_XCONTEXT 20
220 #define MIPS_CP0_DIAG 22
221 #define MIPS_CP0_ECC 26
222 #define MIPS_CP0_CACHE_ERR 27
223 #define MIPS_CP0_TAG_LO 28
224 #define MIPS_CP0_TAG_HI 29
225 #define MIPS_CP0_ERROR_PC 30
226 #define MIPS_CP0_DEBUG 23
227 #define MIPS_CP0_DEPC 24
228 #define MIPS_CP0_PERFCNT 25
229 #define MIPS_CP0_ERRCTL 26
230 #define MIPS_CP0_DATA_LO 28
231 #define MIPS_CP0_DATA_HI 29
232 #define MIPS_CP0_DESAVE 31
233
234 #define MIPS_CP0_CONFIG_SEL 0
235 #define MIPS_CP0_CONFIG1_SEL 1
236 #define MIPS_CP0_CONFIG2_SEL 2
237 #define MIPS_CP0_CONFIG3_SEL 3
238 #define MIPS_CP0_CONFIG4_SEL 4
239 #define MIPS_CP0_CONFIG5_SEL 5
240
241 #define MIPS_CP0_GUESTCTL2 10
242 #define MIPS_CP0_GUESTCTL2_SEL 5
243 #define MIPS_CP0_GTOFFSET 12
244 #define MIPS_CP0_GTOFFSET_SEL 7
245
246 /* Resume Flags */
247 #define RESUME_FLAG_DR (1<<0) /* Reload guest nonvolatile state? */
248 #define RESUME_FLAG_HOST (1<<1) /* Resume host? */
249
250 #define RESUME_GUEST 0
251 #define RESUME_GUEST_DR RESUME_FLAG_DR
252 #define RESUME_HOST RESUME_FLAG_HOST
253
254 enum emulation_result {
255 EMULATE_DONE, /* no further processing */
256 EMULATE_DO_MMIO, /* kvm_run filled with MMIO request */
257 EMULATE_FAIL, /* can't emulate this instruction */
258 EMULATE_WAIT, /* WAIT instruction */
259 EMULATE_PRIV_FAIL,
260 EMULATE_EXCEPT, /* A guest exception has been generated */
261 EMULATE_HYPERCALL, /* HYPCALL instruction */
262 };
263
264 #if defined(CONFIG_64BIT)
265 #define VPN2_MASK GENMASK(cpu_vmbits - 1, 13)
266 #else
267 #define VPN2_MASK 0xffffe000
268 #endif
269 #define KVM_ENTRYHI_ASID cpu_asid_mask(&boot_cpu_data)
270 #define TLB_IS_GLOBAL(x) ((x).tlb_lo[0] & (x).tlb_lo[1] & ENTRYLO_G)
271 #define TLB_VPN2(x) ((x).tlb_hi & VPN2_MASK)
272 #define TLB_ASID(x) ((x).tlb_hi & KVM_ENTRYHI_ASID)
273 #define TLB_LO_IDX(x, va) (((va) >> PAGE_SHIFT) & 1)
274 #define TLB_IS_VALID(x, va) ((x).tlb_lo[TLB_LO_IDX(x, va)] & ENTRYLO_V)
275 #define TLB_IS_DIRTY(x, va) ((x).tlb_lo[TLB_LO_IDX(x, va)] & ENTRYLO_D)
276 #define TLB_HI_VPN2_HIT(x, y) ((TLB_VPN2(x) & ~(x).tlb_mask) == \
277 ((y) & VPN2_MASK & ~(x).tlb_mask))
278 #define TLB_HI_ASID_HIT(x, y) (TLB_IS_GLOBAL(x) || \
279 TLB_ASID(x) == ((y) & KVM_ENTRYHI_ASID))
280
281 struct kvm_mips_tlb {
282 long tlb_mask;
283 long tlb_hi;
284 long tlb_lo[2];
285 };
286
287 #define KVM_MIPS_AUX_FPU 0x1
288 #define KVM_MIPS_AUX_MSA 0x2
289
290 struct kvm_vcpu_arch {
291 void *guest_ebase;
292 int (*vcpu_run)(struct kvm_vcpu *vcpu);
293
294 /* Host registers preserved across guest mode execution */
295 unsigned long host_stack;
296 unsigned long host_gp;
297 unsigned long host_pgd;
298 unsigned long host_entryhi;
299
300 /* Host CP0 registers used when handling exits from guest */
301 unsigned long host_cp0_badvaddr;
302 unsigned long host_cp0_epc;
303 u32 host_cp0_cause;
304 u32 host_cp0_guestctl0;
305 u32 host_cp0_badinstr;
306 u32 host_cp0_badinstrp;
307
308 /* GPRS */
309 unsigned long gprs[32];
310 unsigned long hi;
311 unsigned long lo;
312 unsigned long pc;
313
314 /* FPU State */
315 struct mips_fpu_struct fpu;
316 /* Which auxiliary state is loaded (KVM_MIPS_AUX_*) */
317 unsigned int aux_inuse;
318
319 /* COP0 State */
320 struct mips_coproc cop0;
321
322 /* Resume PC after MMIO completion */
323 unsigned long io_pc;
324 /* GPR used as IO source/target */
325 u32 io_gpr;
326
327 struct hrtimer comparecount_timer;
328 /* Count timer control KVM register */
329 u32 count_ctl;
330 /* Count bias from the raw time */
331 u32 count_bias;
332 /* Frequency of timer in Hz */
333 u32 count_hz;
334 /* Dynamic nanosecond bias (multiple of count_period) to avoid overflow */
335 s64 count_dyn_bias;
336 /* Resume time */
337 ktime_t count_resume;
338 /* Period of timer tick in ns */
339 u64 count_period;
340
341 /* Bitmask of exceptions that are pending */
342 unsigned long pending_exceptions;
343
344 /* Bitmask of pending exceptions to be cleared */
345 unsigned long pending_exceptions_clr;
346
347 /* Cache some mmu pages needed inside spinlock regions */
348 struct kvm_mmu_memory_cache mmu_page_cache;
349
350 /* vcpu's vzguestid is different on each host cpu in an smp system */
351 u32 vzguestid[NR_CPUS];
352
353 /* wired guest TLB entries */
354 struct kvm_mips_tlb *wired_tlb;
355 unsigned int wired_tlb_limit;
356 unsigned int wired_tlb_used;
357
358 /* emulated guest MAAR registers */
359 unsigned long maar[6];
360
361 /* Last CPU the VCPU state was loaded on */
362 int last_sched_cpu;
363 /* Last CPU the VCPU actually executed guest code on */
364 int last_exec_cpu;
365
366 /* WAIT executed */
367 int wait;
368
369 u8 fpu_enabled;
370 u8 msa_enabled;
371 };
372
_kvm_atomic_set_c0_guest_reg(unsigned long * reg,unsigned long val)373 static inline void _kvm_atomic_set_c0_guest_reg(unsigned long *reg,
374 unsigned long val)
375 {
376 unsigned long temp;
377 do {
378 __asm__ __volatile__(
379 " .set push \n"
380 " .set "MIPS_ISA_ARCH_LEVEL" \n"
381 " "__stringify(LONG_LL) " %0, %1 \n"
382 " or %0, %2 \n"
383 " "__stringify(LONG_SC) " %0, %1 \n"
384 " .set pop \n"
385 : "=&r" (temp), "+m" (*reg)
386 : "r" (val));
387 } while (unlikely(!temp));
388 }
389
_kvm_atomic_clear_c0_guest_reg(unsigned long * reg,unsigned long val)390 static inline void _kvm_atomic_clear_c0_guest_reg(unsigned long *reg,
391 unsigned long val)
392 {
393 unsigned long temp;
394 do {
395 __asm__ __volatile__(
396 " .set push \n"
397 " .set "MIPS_ISA_ARCH_LEVEL" \n"
398 " "__stringify(LONG_LL) " %0, %1 \n"
399 " and %0, %2 \n"
400 " "__stringify(LONG_SC) " %0, %1 \n"
401 " .set pop \n"
402 : "=&r" (temp), "+m" (*reg)
403 : "r" (~val));
404 } while (unlikely(!temp));
405 }
406
_kvm_atomic_change_c0_guest_reg(unsigned long * reg,unsigned long change,unsigned long val)407 static inline void _kvm_atomic_change_c0_guest_reg(unsigned long *reg,
408 unsigned long change,
409 unsigned long val)
410 {
411 unsigned long temp;
412 do {
413 __asm__ __volatile__(
414 " .set push \n"
415 " .set "MIPS_ISA_ARCH_LEVEL" \n"
416 " "__stringify(LONG_LL) " %0, %1 \n"
417 " and %0, %2 \n"
418 " or %0, %3 \n"
419 " "__stringify(LONG_SC) " %0, %1 \n"
420 " .set pop \n"
421 : "=&r" (temp), "+m" (*reg)
422 : "r" (~change), "r" (val & change));
423 } while (unlikely(!temp));
424 }
425
426 /* Guest register types, used in accessor build below */
427 #define __KVMT32 u32
428 #define __KVMTl unsigned long
429
430 /*
431 * __BUILD_KVM_$ops_SAVED(): kvm_$op_sw_gc0_$reg()
432 * These operate on the saved guest C0 state in RAM.
433 */
434
435 /* Generate saved context simple accessors */
436 #define __BUILD_KVM_RW_SAVED(name, type, _reg, sel) \
437 static inline __KVMT##type kvm_read_sw_gc0_##name(struct mips_coproc *cop0) \
438 { \
439 return cop0->reg[(_reg)][(sel)]; \
440 } \
441 static inline void kvm_write_sw_gc0_##name(struct mips_coproc *cop0, \
442 __KVMT##type val) \
443 { \
444 cop0->reg[(_reg)][(sel)] = val; \
445 }
446
447 /* Generate saved context bitwise modifiers */
448 #define __BUILD_KVM_SET_SAVED(name, type, _reg, sel) \
449 static inline void kvm_set_sw_gc0_##name(struct mips_coproc *cop0, \
450 __KVMT##type val) \
451 { \
452 cop0->reg[(_reg)][(sel)] |= val; \
453 } \
454 static inline void kvm_clear_sw_gc0_##name(struct mips_coproc *cop0, \
455 __KVMT##type val) \
456 { \
457 cop0->reg[(_reg)][(sel)] &= ~val; \
458 } \
459 static inline void kvm_change_sw_gc0_##name(struct mips_coproc *cop0, \
460 __KVMT##type mask, \
461 __KVMT##type val) \
462 { \
463 unsigned long _mask = mask; \
464 cop0->reg[(_reg)][(sel)] &= ~_mask; \
465 cop0->reg[(_reg)][(sel)] |= val & _mask; \
466 }
467
468 /* Generate saved context atomic bitwise modifiers */
469 #define __BUILD_KVM_ATOMIC_SAVED(name, type, _reg, sel) \
470 static inline void kvm_set_sw_gc0_##name(struct mips_coproc *cop0, \
471 __KVMT##type val) \
472 { \
473 _kvm_atomic_set_c0_guest_reg(&cop0->reg[(_reg)][(sel)], val); \
474 } \
475 static inline void kvm_clear_sw_gc0_##name(struct mips_coproc *cop0, \
476 __KVMT##type val) \
477 { \
478 _kvm_atomic_clear_c0_guest_reg(&cop0->reg[(_reg)][(sel)], val); \
479 } \
480 static inline void kvm_change_sw_gc0_##name(struct mips_coproc *cop0, \
481 __KVMT##type mask, \
482 __KVMT##type val) \
483 { \
484 _kvm_atomic_change_c0_guest_reg(&cop0->reg[(_reg)][(sel)], mask, \
485 val); \
486 }
487
488 /*
489 * __BUILD_KVM_$ops_VZ(): kvm_$op_vz_gc0_$reg()
490 * These operate on the VZ guest C0 context in hardware.
491 */
492
493 /* Generate VZ guest context simple accessors */
494 #define __BUILD_KVM_RW_VZ(name, type, _reg, sel) \
495 static inline __KVMT##type kvm_read_vz_gc0_##name(struct mips_coproc *cop0) \
496 { \
497 return read_gc0_##name(); \
498 } \
499 static inline void kvm_write_vz_gc0_##name(struct mips_coproc *cop0, \
500 __KVMT##type val) \
501 { \
502 write_gc0_##name(val); \
503 }
504
505 /* Generate VZ guest context bitwise modifiers */
506 #define __BUILD_KVM_SET_VZ(name, type, _reg, sel) \
507 static inline void kvm_set_vz_gc0_##name(struct mips_coproc *cop0, \
508 __KVMT##type val) \
509 { \
510 set_gc0_##name(val); \
511 } \
512 static inline void kvm_clear_vz_gc0_##name(struct mips_coproc *cop0, \
513 __KVMT##type val) \
514 { \
515 clear_gc0_##name(val); \
516 } \
517 static inline void kvm_change_vz_gc0_##name(struct mips_coproc *cop0, \
518 __KVMT##type mask, \
519 __KVMT##type val) \
520 { \
521 change_gc0_##name(mask, val); \
522 }
523
524 /* Generate VZ guest context save/restore to/from saved context */
525 #define __BUILD_KVM_SAVE_VZ(name, _reg, sel) \
526 static inline void kvm_restore_gc0_##name(struct mips_coproc *cop0) \
527 { \
528 write_gc0_##name(cop0->reg[(_reg)][(sel)]); \
529 } \
530 static inline void kvm_save_gc0_##name(struct mips_coproc *cop0) \
531 { \
532 cop0->reg[(_reg)][(sel)] = read_gc0_##name(); \
533 }
534
535 /*
536 * __BUILD_KVM_$ops_WRAP(): kvm_$op_$name1() -> kvm_$op_$name2()
537 * These wrap a set of operations to provide them with a different name.
538 */
539
540 /* Generate simple accessor wrapper */
541 #define __BUILD_KVM_RW_WRAP(name1, name2, type) \
542 static inline __KVMT##type kvm_read_##name1(struct mips_coproc *cop0) \
543 { \
544 return kvm_read_##name2(cop0); \
545 } \
546 static inline void kvm_write_##name1(struct mips_coproc *cop0, \
547 __KVMT##type val) \
548 { \
549 kvm_write_##name2(cop0, val); \
550 }
551
552 /* Generate bitwise modifier wrapper */
553 #define __BUILD_KVM_SET_WRAP(name1, name2, type) \
554 static inline void kvm_set_##name1(struct mips_coproc *cop0, \
555 __KVMT##type val) \
556 { \
557 kvm_set_##name2(cop0, val); \
558 } \
559 static inline void kvm_clear_##name1(struct mips_coproc *cop0, \
560 __KVMT##type val) \
561 { \
562 kvm_clear_##name2(cop0, val); \
563 } \
564 static inline void kvm_change_##name1(struct mips_coproc *cop0, \
565 __KVMT##type mask, \
566 __KVMT##type val) \
567 { \
568 kvm_change_##name2(cop0, mask, val); \
569 }
570
571 /*
572 * __BUILD_KVM_$ops_SW(): kvm_$op_c0_guest_$reg() -> kvm_$op_sw_gc0_$reg()
573 * These generate accessors operating on the saved context in RAM, and wrap them
574 * with the common guest C0 accessors (for use by common emulation code).
575 */
576
577 #define __BUILD_KVM_RW_SW(name, type, _reg, sel) \
578 __BUILD_KVM_RW_SAVED(name, type, _reg, sel) \
579 __BUILD_KVM_RW_WRAP(c0_guest_##name, sw_gc0_##name, type)
580
581 #define __BUILD_KVM_SET_SW(name, type, _reg, sel) \
582 __BUILD_KVM_SET_SAVED(name, type, _reg, sel) \
583 __BUILD_KVM_SET_WRAP(c0_guest_##name, sw_gc0_##name, type)
584
585 #define __BUILD_KVM_ATOMIC_SW(name, type, _reg, sel) \
586 __BUILD_KVM_ATOMIC_SAVED(name, type, _reg, sel) \
587 __BUILD_KVM_SET_WRAP(c0_guest_##name, sw_gc0_##name, type)
588
589 /*
590 * VZ (hardware assisted virtualisation)
591 * These macros use the active guest state in VZ mode (hardware registers),
592 */
593
594 /*
595 * __BUILD_KVM_$ops_HW(): kvm_$op_c0_guest_$reg() -> kvm_$op_vz_gc0_$reg()
596 * These generate accessors operating on the VZ guest context in hardware, and
597 * wrap them with the common guest C0 accessors (for use by common emulation
598 * code).
599 *
600 * Accessors operating on the saved context in RAM are also generated to allow
601 * convenient explicit saving and restoring of the state.
602 */
603
604 #define __BUILD_KVM_RW_HW(name, type, _reg, sel) \
605 __BUILD_KVM_RW_SAVED(name, type, _reg, sel) \
606 __BUILD_KVM_RW_VZ(name, type, _reg, sel) \
607 __BUILD_KVM_RW_WRAP(c0_guest_##name, vz_gc0_##name, type) \
608 __BUILD_KVM_SAVE_VZ(name, _reg, sel)
609
610 #define __BUILD_KVM_SET_HW(name, type, _reg, sel) \
611 __BUILD_KVM_SET_SAVED(name, type, _reg, sel) \
612 __BUILD_KVM_SET_VZ(name, type, _reg, sel) \
613 __BUILD_KVM_SET_WRAP(c0_guest_##name, vz_gc0_##name, type)
614
615 /*
616 * We can't do atomic modifications of COP0 state if hardware can modify it.
617 * Races must be handled explicitly.
618 */
619 #define __BUILD_KVM_ATOMIC_HW __BUILD_KVM_SET_HW
620
621 /*
622 * Define accessors for CP0 registers that are accessible to the guest. These
623 * are primarily used by common emulation code, which may need to access the
624 * registers differently depending on the implementation.
625 *
626 * fns_hw/sw name type reg num select
627 */
628 __BUILD_KVM_RW_HW(index, 32, MIPS_CP0_TLB_INDEX, 0)
629 __BUILD_KVM_RW_HW(entrylo0, l, MIPS_CP0_TLB_LO0, 0)
630 __BUILD_KVM_RW_HW(entrylo1, l, MIPS_CP0_TLB_LO1, 0)
631 __BUILD_KVM_RW_HW(context, l, MIPS_CP0_TLB_CONTEXT, 0)
632 __BUILD_KVM_RW_HW(contextconfig, 32, MIPS_CP0_TLB_CONTEXT, 1)
633 __BUILD_KVM_RW_HW(userlocal, l, MIPS_CP0_TLB_CONTEXT, 2)
634 __BUILD_KVM_RW_HW(xcontextconfig, l, MIPS_CP0_TLB_CONTEXT, 3)
635 __BUILD_KVM_RW_HW(pagemask, l, MIPS_CP0_TLB_PG_MASK, 0)
636 __BUILD_KVM_RW_HW(pagegrain, 32, MIPS_CP0_TLB_PG_MASK, 1)
637 __BUILD_KVM_RW_HW(segctl0, l, MIPS_CP0_TLB_PG_MASK, 2)
638 __BUILD_KVM_RW_HW(segctl1, l, MIPS_CP0_TLB_PG_MASK, 3)
639 __BUILD_KVM_RW_HW(segctl2, l, MIPS_CP0_TLB_PG_MASK, 4)
640 __BUILD_KVM_RW_HW(pwbase, l, MIPS_CP0_TLB_PG_MASK, 5)
641 __BUILD_KVM_RW_HW(pwfield, l, MIPS_CP0_TLB_PG_MASK, 6)
642 __BUILD_KVM_RW_HW(pwsize, l, MIPS_CP0_TLB_PG_MASK, 7)
643 __BUILD_KVM_RW_HW(wired, 32, MIPS_CP0_TLB_WIRED, 0)
644 __BUILD_KVM_RW_HW(pwctl, 32, MIPS_CP0_TLB_WIRED, 6)
645 __BUILD_KVM_RW_HW(hwrena, 32, MIPS_CP0_HWRENA, 0)
646 __BUILD_KVM_RW_HW(badvaddr, l, MIPS_CP0_BAD_VADDR, 0)
647 __BUILD_KVM_RW_HW(badinstr, 32, MIPS_CP0_BAD_VADDR, 1)
648 __BUILD_KVM_RW_HW(badinstrp, 32, MIPS_CP0_BAD_VADDR, 2)
649 __BUILD_KVM_RW_SW(count, 32, MIPS_CP0_COUNT, 0)
650 __BUILD_KVM_RW_HW(entryhi, l, MIPS_CP0_TLB_HI, 0)
651 __BUILD_KVM_RW_HW(compare, 32, MIPS_CP0_COMPARE, 0)
652 __BUILD_KVM_RW_HW(status, 32, MIPS_CP0_STATUS, 0)
653 __BUILD_KVM_RW_HW(intctl, 32, MIPS_CP0_STATUS, 1)
654 __BUILD_KVM_RW_HW(cause, 32, MIPS_CP0_CAUSE, 0)
655 __BUILD_KVM_RW_HW(epc, l, MIPS_CP0_EXC_PC, 0)
656 __BUILD_KVM_RW_SW(prid, 32, MIPS_CP0_PRID, 0)
657 __BUILD_KVM_RW_HW(ebase, l, MIPS_CP0_PRID, 1)
658 __BUILD_KVM_RW_HW(config, 32, MIPS_CP0_CONFIG, 0)
659 __BUILD_KVM_RW_HW(config1, 32, MIPS_CP0_CONFIG, 1)
660 __BUILD_KVM_RW_HW(config2, 32, MIPS_CP0_CONFIG, 2)
661 __BUILD_KVM_RW_HW(config3, 32, MIPS_CP0_CONFIG, 3)
662 __BUILD_KVM_RW_HW(config4, 32, MIPS_CP0_CONFIG, 4)
663 __BUILD_KVM_RW_HW(config5, 32, MIPS_CP0_CONFIG, 5)
664 __BUILD_KVM_RW_HW(config6, 32, MIPS_CP0_CONFIG, 6)
665 __BUILD_KVM_RW_HW(config7, 32, MIPS_CP0_CONFIG, 7)
666 __BUILD_KVM_RW_SW(maari, l, MIPS_CP0_LLADDR, 2)
667 __BUILD_KVM_RW_HW(xcontext, l, MIPS_CP0_TLB_XCONTEXT, 0)
668 __BUILD_KVM_RW_HW(errorepc, l, MIPS_CP0_ERROR_PC, 0)
669 __BUILD_KVM_RW_HW(kscratch1, l, MIPS_CP0_DESAVE, 2)
670 __BUILD_KVM_RW_HW(kscratch2, l, MIPS_CP0_DESAVE, 3)
671 __BUILD_KVM_RW_HW(kscratch3, l, MIPS_CP0_DESAVE, 4)
672 __BUILD_KVM_RW_HW(kscratch4, l, MIPS_CP0_DESAVE, 5)
673 __BUILD_KVM_RW_HW(kscratch5, l, MIPS_CP0_DESAVE, 6)
674 __BUILD_KVM_RW_HW(kscratch6, l, MIPS_CP0_DESAVE, 7)
675
676 /* Bitwise operations (on HW state) */
677 __BUILD_KVM_SET_HW(status, 32, MIPS_CP0_STATUS, 0)
678 /* Cause can be modified asynchronously from hardirq hrtimer callback */
679 __BUILD_KVM_ATOMIC_HW(cause, 32, MIPS_CP0_CAUSE, 0)
680 __BUILD_KVM_SET_HW(ebase, l, MIPS_CP0_PRID, 1)
681
682 /* Bitwise operations (on saved state) */
683 __BUILD_KVM_SET_SAVED(config, 32, MIPS_CP0_CONFIG, 0)
684 __BUILD_KVM_SET_SAVED(config1, 32, MIPS_CP0_CONFIG, 1)
685 __BUILD_KVM_SET_SAVED(config2, 32, MIPS_CP0_CONFIG, 2)
686 __BUILD_KVM_SET_SAVED(config3, 32, MIPS_CP0_CONFIG, 3)
687 __BUILD_KVM_SET_SAVED(config4, 32, MIPS_CP0_CONFIG, 4)
688 __BUILD_KVM_SET_SAVED(config5, 32, MIPS_CP0_CONFIG, 5)
689
690 /* Helpers */
691
kvm_mips_guest_can_have_fpu(struct kvm_vcpu_arch * vcpu)692 static inline bool kvm_mips_guest_can_have_fpu(struct kvm_vcpu_arch *vcpu)
693 {
694 return (!__builtin_constant_p(raw_cpu_has_fpu) || raw_cpu_has_fpu) &&
695 vcpu->fpu_enabled;
696 }
697
kvm_mips_guest_has_fpu(struct kvm_vcpu_arch * vcpu)698 static inline bool kvm_mips_guest_has_fpu(struct kvm_vcpu_arch *vcpu)
699 {
700 return kvm_mips_guest_can_have_fpu(vcpu) &&
701 kvm_read_c0_guest_config1(&vcpu->cop0) & MIPS_CONF1_FP;
702 }
703
kvm_mips_guest_can_have_msa(struct kvm_vcpu_arch * vcpu)704 static inline bool kvm_mips_guest_can_have_msa(struct kvm_vcpu_arch *vcpu)
705 {
706 return (!__builtin_constant_p(cpu_has_msa) || cpu_has_msa) &&
707 vcpu->msa_enabled;
708 }
709
kvm_mips_guest_has_msa(struct kvm_vcpu_arch * vcpu)710 static inline bool kvm_mips_guest_has_msa(struct kvm_vcpu_arch *vcpu)
711 {
712 return kvm_mips_guest_can_have_msa(vcpu) &&
713 kvm_read_c0_guest_config3(&vcpu->cop0) & MIPS_CONF3_MSA;
714 }
715
716 struct kvm_mips_callbacks {
717 int (*handle_cop_unusable)(struct kvm_vcpu *vcpu);
718 int (*handle_tlb_mod)(struct kvm_vcpu *vcpu);
719 int (*handle_tlb_ld_miss)(struct kvm_vcpu *vcpu);
720 int (*handle_tlb_st_miss)(struct kvm_vcpu *vcpu);
721 int (*handle_addr_err_st)(struct kvm_vcpu *vcpu);
722 int (*handle_addr_err_ld)(struct kvm_vcpu *vcpu);
723 int (*handle_syscall)(struct kvm_vcpu *vcpu);
724 int (*handle_res_inst)(struct kvm_vcpu *vcpu);
725 int (*handle_break)(struct kvm_vcpu *vcpu);
726 int (*handle_trap)(struct kvm_vcpu *vcpu);
727 int (*handle_msa_fpe)(struct kvm_vcpu *vcpu);
728 int (*handle_fpe)(struct kvm_vcpu *vcpu);
729 int (*handle_msa_disabled)(struct kvm_vcpu *vcpu);
730 int (*handle_guest_exit)(struct kvm_vcpu *vcpu);
731 int (*hardware_enable)(void);
732 void (*hardware_disable)(void);
733 int (*check_extension)(struct kvm *kvm, long ext);
734 int (*vcpu_init)(struct kvm_vcpu *vcpu);
735 void (*vcpu_uninit)(struct kvm_vcpu *vcpu);
736 int (*vcpu_setup)(struct kvm_vcpu *vcpu);
737 void (*prepare_flush_shadow)(struct kvm *kvm);
738 gpa_t (*gva_to_gpa)(gva_t gva);
739 void (*queue_timer_int)(struct kvm_vcpu *vcpu);
740 void (*dequeue_timer_int)(struct kvm_vcpu *vcpu);
741 void (*queue_io_int)(struct kvm_vcpu *vcpu,
742 struct kvm_mips_interrupt *irq);
743 void (*dequeue_io_int)(struct kvm_vcpu *vcpu,
744 struct kvm_mips_interrupt *irq);
745 int (*irq_deliver)(struct kvm_vcpu *vcpu, unsigned int priority,
746 u32 cause);
747 int (*irq_clear)(struct kvm_vcpu *vcpu, unsigned int priority,
748 u32 cause);
749 unsigned long (*num_regs)(struct kvm_vcpu *vcpu);
750 int (*copy_reg_indices)(struct kvm_vcpu *vcpu, u64 __user *indices);
751 int (*get_one_reg)(struct kvm_vcpu *vcpu,
752 const struct kvm_one_reg *reg, s64 *v);
753 int (*set_one_reg)(struct kvm_vcpu *vcpu,
754 const struct kvm_one_reg *reg, s64 v);
755 int (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
756 int (*vcpu_put)(struct kvm_vcpu *vcpu, int cpu);
757 int (*vcpu_run)(struct kvm_vcpu *vcpu);
758 void (*vcpu_reenter)(struct kvm_vcpu *vcpu);
759 };
760 extern const struct kvm_mips_callbacks * const kvm_mips_callbacks;
761 int kvm_mips_emulation_init(void);
762
763 /* Debug: dump vcpu state */
764 int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu);
765
766 extern int kvm_mips_handle_exit(struct kvm_vcpu *vcpu);
767
768 /* Building of entry/exception code */
769 int kvm_mips_entry_setup(void);
770 void *kvm_mips_build_vcpu_run(void *addr);
771 void *kvm_mips_build_tlb_refill_exception(void *addr, void *handler);
772 void *kvm_mips_build_exception(void *addr, void *handler);
773 void *kvm_mips_build_exit(void *addr);
774
775 /* FPU/MSA context management */
776 void __kvm_save_fpu(struct kvm_vcpu_arch *vcpu);
777 void __kvm_restore_fpu(struct kvm_vcpu_arch *vcpu);
778 void __kvm_restore_fcsr(struct kvm_vcpu_arch *vcpu);
779 void __kvm_save_msa(struct kvm_vcpu_arch *vcpu);
780 void __kvm_restore_msa(struct kvm_vcpu_arch *vcpu);
781 void __kvm_restore_msa_upper(struct kvm_vcpu_arch *vcpu);
782 void __kvm_restore_msacsr(struct kvm_vcpu_arch *vcpu);
783 void kvm_own_fpu(struct kvm_vcpu *vcpu);
784 void kvm_own_msa(struct kvm_vcpu *vcpu);
785 void kvm_drop_fpu(struct kvm_vcpu *vcpu);
786 void kvm_lose_fpu(struct kvm_vcpu *vcpu);
787
788 /* TLB handling */
789 int kvm_mips_handle_vz_root_tlb_fault(unsigned long badvaddr,
790 struct kvm_vcpu *vcpu, bool write_fault);
791
792 int kvm_vz_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long entryhi);
793 int kvm_vz_guest_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long gva,
794 unsigned long *gpa);
795 void kvm_vz_local_flush_roottlb_all_guests(void);
796 void kvm_vz_local_flush_guesttlb_all(void);
797 void kvm_vz_save_guesttlb(struct kvm_mips_tlb *buf, unsigned int index,
798 unsigned int count);
799 void kvm_vz_load_guesttlb(const struct kvm_mips_tlb *buf, unsigned int index,
800 unsigned int count);
801 #ifdef CONFIG_CPU_LOONGSON64
802 void kvm_loongson_clear_guest_vtlb(void);
803 void kvm_loongson_clear_guest_ftlb(void);
804 #endif
805
806 /* MMU handling */
807
808 bool kvm_mips_flush_gpa_pt(struct kvm *kvm, gfn_t start_gfn, gfn_t end_gfn);
809 int kvm_mips_mkclean_gpa_pt(struct kvm *kvm, gfn_t start_gfn, gfn_t end_gfn);
810 pgd_t *kvm_pgd_alloc(void);
811 void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu);
812
813 /* Emulation */
814 enum emulation_result update_pc(struct kvm_vcpu *vcpu, u32 cause);
815 int kvm_get_badinstr(u32 *opc, struct kvm_vcpu *vcpu, u32 *out);
816 int kvm_get_badinstrp(u32 *opc, struct kvm_vcpu *vcpu, u32 *out);
817
818 /**
819 * kvm_is_ifetch_fault() - Find whether a TLBL exception is due to ifetch fault.
820 * @vcpu: Virtual CPU.
821 *
822 * Returns: Whether the TLBL exception was likely due to an instruction
823 * fetch fault rather than a data load fault.
824 */
kvm_is_ifetch_fault(struct kvm_vcpu_arch * vcpu)825 static inline bool kvm_is_ifetch_fault(struct kvm_vcpu_arch *vcpu)
826 {
827 unsigned long badvaddr = vcpu->host_cp0_badvaddr;
828 unsigned long epc = msk_isa16_mode(vcpu->pc);
829 u32 cause = vcpu->host_cp0_cause;
830
831 if (epc == badvaddr)
832 return true;
833
834 /*
835 * Branches may be 32-bit or 16-bit instructions.
836 * This isn't exact, but we don't really support MIPS16 or microMIPS yet
837 * in KVM anyway.
838 */
839 if ((cause & CAUSEF_BD) && badvaddr - epc <= 4)
840 return true;
841
842 return false;
843 }
844
845 extern enum emulation_result kvm_mips_complete_mmio_load(struct kvm_vcpu *vcpu);
846
847 u32 kvm_mips_read_count(struct kvm_vcpu *vcpu);
848 void kvm_mips_write_count(struct kvm_vcpu *vcpu, u32 count);
849 void kvm_mips_write_compare(struct kvm_vcpu *vcpu, u32 compare, bool ack);
850 void kvm_mips_init_count(struct kvm_vcpu *vcpu, unsigned long count_hz);
851 int kvm_mips_set_count_ctl(struct kvm_vcpu *vcpu, s64 count_ctl);
852 int kvm_mips_set_count_resume(struct kvm_vcpu *vcpu, s64 count_resume);
853 int kvm_mips_set_count_hz(struct kvm_vcpu *vcpu, s64 count_hz);
854 void kvm_mips_count_enable_cause(struct kvm_vcpu *vcpu);
855 void kvm_mips_count_disable_cause(struct kvm_vcpu *vcpu);
856 enum hrtimer_restart kvm_mips_count_timeout(struct kvm_vcpu *vcpu);
857
858 /* fairly internal functions requiring some care to use */
859 int kvm_mips_count_disabled(struct kvm_vcpu *vcpu);
860 ktime_t kvm_mips_freeze_hrtimer(struct kvm_vcpu *vcpu, u32 *count);
861 int kvm_mips_restore_hrtimer(struct kvm_vcpu *vcpu, ktime_t before,
862 u32 count, int min_drift);
863
864 void kvm_vz_acquire_htimer(struct kvm_vcpu *vcpu);
865 void kvm_vz_lose_htimer(struct kvm_vcpu *vcpu);
866
867 enum emulation_result kvm_mips_emulate_store(union mips_instruction inst,
868 u32 cause,
869 struct kvm_vcpu *vcpu);
870 enum emulation_result kvm_mips_emulate_load(union mips_instruction inst,
871 u32 cause,
872 struct kvm_vcpu *vcpu);
873
874 /* COP0 */
875 enum emulation_result kvm_mips_emul_wait(struct kvm_vcpu *vcpu);
876
877 /* Hypercalls (hypcall.c) */
878
879 enum emulation_result kvm_mips_emul_hypcall(struct kvm_vcpu *vcpu,
880 union mips_instruction inst);
881 int kvm_mips_handle_hypcall(struct kvm_vcpu *vcpu);
882
883 /* Misc */
884 extern void kvm_mips_dump_stats(struct kvm_vcpu *vcpu);
885 extern unsigned long kvm_mips_get_ramsize(struct kvm *kvm);
886 extern int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
887 struct kvm_mips_interrupt *irq);
888
kvm_arch_sync_events(struct kvm * kvm)889 static inline void kvm_arch_sync_events(struct kvm *kvm) {}
kvm_arch_free_memslot(struct kvm * kvm,struct kvm_memory_slot * slot)890 static inline void kvm_arch_free_memslot(struct kvm *kvm,
891 struct kvm_memory_slot *slot) {}
kvm_arch_memslots_updated(struct kvm * kvm,u64 gen)892 static inline void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen) {}
kvm_arch_sched_in(struct kvm_vcpu * vcpu,int cpu)893 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
kvm_arch_vcpu_blocking(struct kvm_vcpu * vcpu)894 static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {}
kvm_arch_vcpu_unblocking(struct kvm_vcpu * vcpu)895 static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) {}
896
897 #define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS
898
899 #endif /* __MIPS_KVM_HOST_H__ */
900