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 #define KVM_ARCH_WANT_MMU_NOTIFIER 814 815 /* Emulation */ 816 enum emulation_result update_pc(struct kvm_vcpu *vcpu, u32 cause); 817 int kvm_get_badinstr(u32 *opc, struct kvm_vcpu *vcpu, u32 *out); 818 int kvm_get_badinstrp(u32 *opc, struct kvm_vcpu *vcpu, u32 *out); 819 820 /** 821 * kvm_is_ifetch_fault() - Find whether a TLBL exception is due to ifetch fault. 822 * @vcpu: Virtual CPU. 823 * 824 * Returns: Whether the TLBL exception was likely due to an instruction 825 * fetch fault rather than a data load fault. 826 */ kvm_is_ifetch_fault(struct kvm_vcpu_arch * vcpu)827 static inline bool kvm_is_ifetch_fault(struct kvm_vcpu_arch *vcpu) 828 { 829 unsigned long badvaddr = vcpu->host_cp0_badvaddr; 830 unsigned long epc = msk_isa16_mode(vcpu->pc); 831 u32 cause = vcpu->host_cp0_cause; 832 833 if (epc == badvaddr) 834 return true; 835 836 /* 837 * Branches may be 32-bit or 16-bit instructions. 838 * This isn't exact, but we don't really support MIPS16 or microMIPS yet 839 * in KVM anyway. 840 */ 841 if ((cause & CAUSEF_BD) && badvaddr - epc <= 4) 842 return true; 843 844 return false; 845 } 846 847 extern enum emulation_result kvm_mips_complete_mmio_load(struct kvm_vcpu *vcpu); 848 849 u32 kvm_mips_read_count(struct kvm_vcpu *vcpu); 850 void kvm_mips_write_count(struct kvm_vcpu *vcpu, u32 count); 851 void kvm_mips_write_compare(struct kvm_vcpu *vcpu, u32 compare, bool ack); 852 void kvm_mips_init_count(struct kvm_vcpu *vcpu, unsigned long count_hz); 853 int kvm_mips_set_count_ctl(struct kvm_vcpu *vcpu, s64 count_ctl); 854 int kvm_mips_set_count_resume(struct kvm_vcpu *vcpu, s64 count_resume); 855 int kvm_mips_set_count_hz(struct kvm_vcpu *vcpu, s64 count_hz); 856 void kvm_mips_count_enable_cause(struct kvm_vcpu *vcpu); 857 void kvm_mips_count_disable_cause(struct kvm_vcpu *vcpu); 858 enum hrtimer_restart kvm_mips_count_timeout(struct kvm_vcpu *vcpu); 859 860 /* fairly internal functions requiring some care to use */ 861 int kvm_mips_count_disabled(struct kvm_vcpu *vcpu); 862 ktime_t kvm_mips_freeze_hrtimer(struct kvm_vcpu *vcpu, u32 *count); 863 int kvm_mips_restore_hrtimer(struct kvm_vcpu *vcpu, ktime_t before, 864 u32 count, int min_drift); 865 866 void kvm_vz_acquire_htimer(struct kvm_vcpu *vcpu); 867 void kvm_vz_lose_htimer(struct kvm_vcpu *vcpu); 868 869 enum emulation_result kvm_mips_emulate_store(union mips_instruction inst, 870 u32 cause, 871 struct kvm_vcpu *vcpu); 872 enum emulation_result kvm_mips_emulate_load(union mips_instruction inst, 873 u32 cause, 874 struct kvm_vcpu *vcpu); 875 876 /* COP0 */ 877 enum emulation_result kvm_mips_emul_wait(struct kvm_vcpu *vcpu); 878 879 /* Hypercalls (hypcall.c) */ 880 881 enum emulation_result kvm_mips_emul_hypcall(struct kvm_vcpu *vcpu, 882 union mips_instruction inst); 883 int kvm_mips_handle_hypcall(struct kvm_vcpu *vcpu); 884 885 /* Misc */ 886 extern void kvm_mips_dump_stats(struct kvm_vcpu *vcpu); 887 extern unsigned long kvm_mips_get_ramsize(struct kvm *kvm); 888 extern int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, 889 struct kvm_mips_interrupt *irq); 890 kvm_arch_sync_events(struct kvm * kvm)891 static inline void kvm_arch_sync_events(struct kvm *kvm) {} kvm_arch_free_memslot(struct kvm * kvm,struct kvm_memory_slot * slot)892 static inline void kvm_arch_free_memslot(struct kvm *kvm, 893 struct kvm_memory_slot *slot) {} kvm_arch_memslots_updated(struct kvm * kvm,u64 gen)894 static inline void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen) {} kvm_arch_sched_in(struct kvm_vcpu * vcpu,int cpu)895 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {} kvm_arch_vcpu_blocking(struct kvm_vcpu * vcpu)896 static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {} kvm_arch_vcpu_unblocking(struct kvm_vcpu * vcpu)897 static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) {} 898 899 #define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS 900 901 #endif /* __MIPS_KVM_HOST_H__ */ 902