arch/mips/include/asm/kvm_host.h

   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/mutex.h>
  14 #include <linux/hrtimer.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/types.h>
  17 #include <linux/kvm.h>
  18 #include <linux/kvm_types.h>
  19 #include <linux/threads.h>
  20 #include <linux/spinlock.h>
  21
  22 #include <asm/inst.h>
  23 #include <asm/mipsregs.h>
  24
  25 /* MIPS KVM register ids */
  26 #define MIPS_CP0_32(_R, _S)                                     \
  27         (KVM_REG_MIPS_CP0 | KVM_REG_SIZE_U32 | (8 * (_R) + (_S)))
  28
  29 #define MIPS_CP0_64(_R, _S)                                     \
  30         (KVM_REG_MIPS_CP0 | KVM_REG_SIZE_U64 | (8 * (_R) + (_S)))
  31
  32 #define KVM_REG_MIPS_CP0_INDEX          MIPS_CP0_32(0, 0)
  33 #define KVM_REG_MIPS_CP0_ENTRYLO0       MIPS_CP0_64(2, 0)
  34 #define KVM_REG_MIPS_CP0_ENTRYLO1       MIPS_CP0_64(3, 0)
  35 #define KVM_REG_MIPS_CP0_CONTEXT        MIPS_CP0_64(4, 0)
  36 #define KVM_REG_MIPS_CP0_USERLOCAL      MIPS_CP0_64(4, 2)
  37 #define KVM_REG_MIPS_CP0_PAGEMASK       MIPS_CP0_32(5, 0)
  38 #define KVM_REG_MIPS_CP0_PAGEGRAIN      MIPS_CP0_32(5, 1)
  39 #define KVM_REG_MIPS_CP0_WIRED          MIPS_CP0_32(6, 0)
  40 #define KVM_REG_MIPS_CP0_HWRENA         MIPS_CP0_32(7, 0)
  41 #define KVM_REG_MIPS_CP0_BADVADDR       MIPS_CP0_64(8, 0)
  42 #define KVM_REG_MIPS_CP0_COUNT          MIPS_CP0_32(9, 0)
  43 #define KVM_REG_MIPS_CP0_ENTRYHI        MIPS_CP0_64(10, 0)
  44 #define KVM_REG_MIPS_CP0_COMPARE        MIPS_CP0_32(11, 0)
  45 #define KVM_REG_MIPS_CP0_STATUS         MIPS_CP0_32(12, 0)
  46 #define KVM_REG_MIPS_CP0_CAUSE          MIPS_CP0_32(13, 0)
  47 #define KVM_REG_MIPS_CP0_EPC            MIPS_CP0_64(14, 0)
  48 #define KVM_REG_MIPS_CP0_PRID           MIPS_CP0_32(15, 0)
  49 #define KVM_REG_MIPS_CP0_EBASE          MIPS_CP0_64(15, 1)
  50 #define KVM_REG_MIPS_CP0_CONFIG         MIPS_CP0_32(16, 0)
  51 #define KVM_REG_MIPS_CP0_CONFIG1        MIPS_CP0_32(16, 1)
  52 #define KVM_REG_MIPS_CP0_CONFIG2        MIPS_CP0_32(16, 2)
  53 #define KVM_REG_MIPS_CP0_CONFIG3        MIPS_CP0_32(16, 3)
  54 #define KVM_REG_MIPS_CP0_CONFIG4        MIPS_CP0_32(16, 4)
  55 #define KVM_REG_MIPS_CP0_CONFIG5        MIPS_CP0_32(16, 5)
  56 #define KVM_REG_MIPS_CP0_CONFIG7        MIPS_CP0_32(16, 7)
  57 #define KVM_REG_MIPS_CP0_XCONTEXT       MIPS_CP0_64(20, 0)
  58 #define KVM_REG_MIPS_CP0_ERROREPC       MIPS_CP0_64(30, 0)
  59 #define KVM_REG_MIPS_CP0_KSCRATCH1      MIPS_CP0_64(31, 2)
  60 #define KVM_REG_MIPS_CP0_KSCRATCH2      MIPS_CP0_64(31, 3)
  61 #define KVM_REG_MIPS_CP0_KSCRATCH3      MIPS_CP0_64(31, 4)
  62 #define KVM_REG_MIPS_CP0_KSCRATCH4      MIPS_CP0_64(31, 5)
  63 #define KVM_REG_MIPS_CP0_KSCRATCH5      MIPS_CP0_64(31, 6)
  64 #define KVM_REG_MIPS_CP0_KSCRATCH6      MIPS_CP0_64(31, 7)
  65
  66
  67 #define KVM_MAX_VCPUS           1
  68 #define KVM_USER_MEM_SLOTS      8
  69 /* memory slots that does not exposed to userspace */
  70 #define KVM_PRIVATE_MEM_SLOTS   0
  71
  72 #define KVM_COALESCED_MMIO_PAGE_OFFSET 1
  73 #define KVM_HALT_POLL_NS_DEFAULT 500000
  74
  75
  76
  77 /*
  78  * Special address that contains the comm page, used for reducing # of traps
  79  * This needs to be within 32Kb of 0x0 (so the zero register can be used), but
  80  * preferably not at 0x0 so that most kernel NULL pointer dereferences can be
  81  * caught.
  82  */
  83 #define KVM_GUEST_COMMPAGE_ADDR         ((PAGE_SIZE > 0x8000) ? 0 : \
  84                                          (0x8000 - PAGE_SIZE))
  85
  86 #define KVM_GUEST_KERNEL_MODE(vcpu)     ((kvm_read_c0_guest_status(vcpu->arch.cop0) & (ST0_EXL | ST0_ERL)) || \
  87                                         ((kvm_read_c0_guest_status(vcpu->arch.cop0) & KSU_USER) == 0))
  88
  89 #define KVM_GUEST_KUSEG                 0x00000000UL
  90 #define KVM_GUEST_KSEG0                 0x40000000UL
  91 #define KVM_GUEST_KSEG23                0x60000000UL
  92 #define KVM_GUEST_KSEGX(a)              ((_ACAST32_(a)) & 0xe0000000)
  93 #define KVM_GUEST_CPHYSADDR(a)          ((_ACAST32_(a)) & 0x1fffffff)
  94
  95 #define KVM_GUEST_CKSEG0ADDR(a)         (KVM_GUEST_CPHYSADDR(a) | KVM_GUEST_KSEG0)
  96 #define KVM_GUEST_CKSEG1ADDR(a)         (KVM_GUEST_CPHYSADDR(a) | KVM_GUEST_KSEG1)
  97 #define KVM_GUEST_CKSEG23ADDR(a)        (KVM_GUEST_CPHYSADDR(a) | KVM_GUEST_KSEG23)
  98
  99 /*
 100  * Map an address to a certain kernel segment
 101  */
 102 #define KVM_GUEST_KSEG0ADDR(a)          (KVM_GUEST_CPHYSADDR(a) | KVM_GUEST_KSEG0)
 103 #define KVM_GUEST_KSEG1ADDR(a)          (KVM_GUEST_CPHYSADDR(a) | KVM_GUEST_KSEG1)
 104 #define KVM_GUEST_KSEG23ADDR(a)         (KVM_GUEST_CPHYSADDR(a) | KVM_GUEST_KSEG23)
 105
 106 #define KVM_INVALID_PAGE                0xdeadbeef
 107 #define KVM_INVALID_INST                0xdeadbeef
 108 #define KVM_INVALID_ADDR                0xdeadbeef
 109
 110 extern atomic_t kvm_mips_instance;
 111
 112 struct kvm_vm_stat {
 113         u32 remote_tlb_flush;
 114 };
 115
 116 struct kvm_vcpu_stat {
 117         u32 wait_exits;
 118         u32 cache_exits;
 119         u32 signal_exits;
 120         u32 int_exits;
 121         u32 cop_unusable_exits;
 122         u32 tlbmod_exits;
 123         u32 tlbmiss_ld_exits;
 124         u32 tlbmiss_st_exits;
 125         u32 addrerr_st_exits;
 126         u32 addrerr_ld_exits;
 127         u32 syscall_exits;
 128         u32 resvd_inst_exits;
 129         u32 break_inst_exits;
 130         u32 trap_inst_exits;
 131         u32 msa_fpe_exits;
 132         u32 fpe_exits;
 133         u32 msa_disabled_exits;
 134         u32 flush_dcache_exits;
 135         u32 halt_successful_poll;
 136         u32 halt_attempted_poll;
 137         u32 halt_poll_invalid;
 138         u32 halt_wakeup;
 139 };
 140
 141 struct kvm_arch_memory_slot {
 142 };
 143
 144 struct kvm_arch {
 145         /* Guest GVA->HPA page table */
 146         unsigned long *guest_pmap;
 147         unsigned long guest_pmap_npages;
 148
 149         /* Wired host TLB used for the commpage */
 150         int commpage_tlb;
 151 };
 152
 153 #define N_MIPS_COPROC_REGS      32
 154 #define N_MIPS_COPROC_SEL       8
 155
 156 struct mips_coproc {
 157         unsigned long reg[N_MIPS_COPROC_REGS][N_MIPS_COPROC_SEL];
 158 #ifdef CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS
 159         unsigned long stat[N_MIPS_COPROC_REGS][N_MIPS_COPROC_SEL];
 160 #endif
 161 };
 162
 163 /*
 164  * Coprocessor 0 register names
 165  */
 166 #define MIPS_CP0_TLB_INDEX      0
 167 #define MIPS_CP0_TLB_RANDOM     1
 168 #define MIPS_CP0_TLB_LOW        2
 169 #define MIPS_CP0_TLB_LO0        2
 170 #define MIPS_CP0_TLB_LO1        3
 171 #define MIPS_CP0_TLB_CONTEXT    4
 172 #define MIPS_CP0_TLB_PG_MASK    5
 173 #define MIPS_CP0_TLB_WIRED      6
 174 #define MIPS_CP0_HWRENA         7
 175 #define MIPS_CP0_BAD_VADDR      8
 176 #define MIPS_CP0_COUNT          9
 177 #define MIPS_CP0_TLB_HI         10
 178 #define MIPS_CP0_COMPARE        11
 179 #define MIPS_CP0_STATUS         12
 180 #define MIPS_CP0_CAUSE          13
 181 #define MIPS_CP0_EXC_PC         14
 182 #define MIPS_CP0_PRID           15
 183 #define MIPS_CP0_CONFIG         16
 184 #define MIPS_CP0_LLADDR         17
 185 #define MIPS_CP0_WATCH_LO       18
 186 #define MIPS_CP0_WATCH_HI       19
 187 #define MIPS_CP0_TLB_XCONTEXT   20
 188 #define MIPS_CP0_ECC            26
 189 #define MIPS_CP0_CACHE_ERR      27
 190 #define MIPS_CP0_TAG_LO         28
 191 #define MIPS_CP0_TAG_HI         29
 192 #define MIPS_CP0_ERROR_PC       30
 193 #define MIPS_CP0_DEBUG          23
 194 #define MIPS_CP0_DEPC           24
 195 #define MIPS_CP0_PERFCNT        25
 196 #define MIPS_CP0_ERRCTL         26
 197 #define MIPS_CP0_DATA_LO        28
 198 #define MIPS_CP0_DATA_HI        29
 199 #define MIPS_CP0_DESAVE         31
 200
 201 #define MIPS_CP0_CONFIG_SEL     0
 202 #define MIPS_CP0_CONFIG1_SEL    1
 203 #define MIPS_CP0_CONFIG2_SEL    2
 204 #define MIPS_CP0_CONFIG3_SEL    3
 205 #define MIPS_CP0_CONFIG4_SEL    4
 206 #define MIPS_CP0_CONFIG5_SEL    5
 207
 208 /* Resume Flags */
 209 #define RESUME_FLAG_DR          (1<<0)  /* Reload guest nonvolatile state? */
 210 #define RESUME_FLAG_HOST        (1<<1)  /* Resume host? */
 211
 212 #define RESUME_GUEST            0
 213 #define RESUME_GUEST_DR         RESUME_FLAG_DR
 214 #define RESUME_HOST             RESUME_FLAG_HOST
 215
 216 enum emulation_result {
 217         EMULATE_DONE,           /* no further processing */
 218         EMULATE_DO_MMIO,        /* kvm_run filled with MMIO request */
 219         EMULATE_FAIL,           /* can't emulate this instruction */
 220         EMULATE_WAIT,           /* WAIT instruction */
 221         EMULATE_PRIV_FAIL,
 222 };
 223
 224 #define mips3_paddr_to_tlbpfn(x) \
 225         (((unsigned long)(x) >> MIPS3_PG_SHIFT) & MIPS3_PG_FRAME)
 226 #define mips3_tlbpfn_to_paddr(x) \
 227         ((unsigned long)((x) & MIPS3_PG_FRAME) << MIPS3_PG_SHIFT)
 228
 229 #define MIPS3_PG_SHIFT          6
 230 #define MIPS3_PG_FRAME          0x3fffffc0
 231
 232 #define VPN2_MASK               0xffffe000
 233 #define KVM_ENTRYHI_ASID        MIPS_ENTRYHI_ASID
 234 #define TLB_IS_GLOBAL(x)        ((x).tlb_lo[0] & (x).tlb_lo[1] & ENTRYLO_G)
 235 #define TLB_VPN2(x)             ((x).tlb_hi & VPN2_MASK)
 236 #define TLB_ASID(x)             ((x).tlb_hi & KVM_ENTRYHI_ASID)
 237 #define TLB_LO_IDX(x, va)       (((va) >> PAGE_SHIFT) & 1)
 238 #define TLB_IS_VALID(x, va)     ((x).tlb_lo[TLB_LO_IDX(x, va)] & ENTRYLO_V)
 239 #define TLB_HI_VPN2_HIT(x, y)   ((TLB_VPN2(x) & ~(x).tlb_mask) ==       \
 240                                  ((y) & VPN2_MASK & ~(x).tlb_mask))
 241 #define TLB_HI_ASID_HIT(x, y)   (TLB_IS_GLOBAL(x) ||                    \
 242                                  TLB_ASID(x) == ((y) & KVM_ENTRYHI_ASID))
 243
 244 struct kvm_mips_tlb {
 245         long tlb_mask;
 246         long tlb_hi;
 247         long tlb_lo[2];
 248 };
 249
 250 #define KVM_MIPS_AUX_FPU        0x1
 251 #define KVM_MIPS_AUX_MSA        0x2
 252
 253 #define KVM_MIPS_GUEST_TLB_SIZE 64
 254 struct kvm_vcpu_arch {
 255         void *guest_ebase;
 256         int (*vcpu_run)(struct kvm_run *run, struct kvm_vcpu *vcpu);
 257         unsigned long host_stack;
 258         unsigned long host_gp;
 259
 260         /* Host CP0 registers used when handling exits from guest */
 261         unsigned long host_cp0_badvaddr;
 262         unsigned long host_cp0_epc;
 263         u32 host_cp0_cause;
 264
 265         /* GPRS */
 266         unsigned long gprs[32];
 267         unsigned long hi;
 268         unsigned long lo;
 269         unsigned long pc;
 270
 271         /* FPU State */
 272         struct mips_fpu_struct fpu;
 273         /* Which auxiliary state is loaded (KVM_MIPS_AUX_*) */
 274         unsigned int aux_inuse;
 275
 276         /* COP0 State */
 277         struct mips_coproc *cop0;
 278
 279         /* Host KSEG0 address of the EI/DI offset */
 280         void *kseg0_commpage;
 281
 282         u32 io_gpr;             /* GPR used as IO source/target */
 283
 284         struct hrtimer comparecount_timer;
 285         /* Count timer control KVM register */
 286         u32 count_ctl;
 287         /* Count bias from the raw time */
 288         u32 count_bias;
 289         /* Frequency of timer in Hz */
 290         u32 count_hz;
 291         /* Dynamic nanosecond bias (multiple of count_period) to avoid overflow */
 292         s64 count_dyn_bias;
 293         /* Resume time */
 294         ktime_t count_resume;
 295         /* Period of timer tick in ns */
 296         u64 count_period;
 297
 298         /* Bitmask of exceptions that are pending */
 299         unsigned long pending_exceptions;
 300
 301         /* Bitmask of pending exceptions to be cleared */
 302         unsigned long pending_exceptions_clr;
 303
 304         u32 pending_load_cause;
 305
 306         /* Save/Restore the entryhi register when are are preempted/scheduled back in */
 307         unsigned long preempt_entryhi;
 308
 309         /* S/W Based TLB for guest */
 310         struct kvm_mips_tlb guest_tlb[KVM_MIPS_GUEST_TLB_SIZE];
 311
 312         /* Cached guest kernel/user ASIDs */
 313         u32 guest_user_asid[NR_CPUS];
 314         u32 guest_kernel_asid[NR_CPUS];
 315         struct mm_struct guest_kernel_mm, guest_user_mm;
 316
 317         int last_sched_cpu;
 318
 319         /* WAIT executed */
 320         int wait;
 321
 322         u8 fpu_enabled;
 323         u8 msa_enabled;
 324         u8 kscratch_enabled;
 325 };
 326
 327
 328 #define kvm_read_c0_guest_index(cop0)           (cop0->reg[MIPS_CP0_TLB_INDEX][0])
 329 #define kvm_write_c0_guest_index(cop0, val)     (cop0->reg[MIPS_CP0_TLB_INDEX][0] = val)
 330 #define kvm_read_c0_guest_entrylo0(cop0)        (cop0->reg[MIPS_CP0_TLB_LO0][0])
 331 #define kvm_read_c0_guest_entrylo1(cop0)        (cop0->reg[MIPS_CP0_TLB_LO1][0])
 332 #define kvm_read_c0_guest_context(cop0)         (cop0->reg[MIPS_CP0_TLB_CONTEXT][0])
 333 #define kvm_write_c0_guest_context(cop0, val)   (cop0->reg[MIPS_CP0_TLB_CONTEXT][0] = (val))
 334 #define kvm_read_c0_guest_userlocal(cop0)       (cop0->reg[MIPS_CP0_TLB_CONTEXT][2])
 335 #define kvm_write_c0_guest_userlocal(cop0, val) (cop0->reg[MIPS_CP0_TLB_CONTEXT][2] = (val))
 336 #define kvm_read_c0_guest_pagemask(cop0)        (cop0->reg[MIPS_CP0_TLB_PG_MASK][0])
 337 #define kvm_write_c0_guest_pagemask(cop0, val)  (cop0->reg[MIPS_CP0_TLB_PG_MASK][0] = (val))
 338 #define kvm_read_c0_guest_wired(cop0)           (cop0->reg[MIPS_CP0_TLB_WIRED][0])
 339 #define kvm_write_c0_guest_wired(cop0, val)     (cop0->reg[MIPS_CP0_TLB_WIRED][0] = (val))
 340 #define kvm_read_c0_guest_hwrena(cop0)          (cop0->reg[MIPS_CP0_HWRENA][0])
 341 #define kvm_write_c0_guest_hwrena(cop0, val)    (cop0->reg[MIPS_CP0_HWRENA][0] = (val))
 342 #define kvm_read_c0_guest_badvaddr(cop0)        (cop0->reg[MIPS_CP0_BAD_VADDR][0])
 343 #define kvm_write_c0_guest_badvaddr(cop0, val)  (cop0->reg[MIPS_CP0_BAD_VADDR][0] = (val))
 344 #define kvm_read_c0_guest_count(cop0)           (cop0->reg[MIPS_CP0_COUNT][0])
 345 #define kvm_write_c0_guest_count(cop0, val)     (cop0->reg[MIPS_CP0_COUNT][0] = (val))
 346 #define kvm_read_c0_guest_entryhi(cop0)         (cop0->reg[MIPS_CP0_TLB_HI][0])
 347 #define kvm_write_c0_guest_entryhi(cop0, val)   (cop0->reg[MIPS_CP0_TLB_HI][0] = (val))
 348 #define kvm_read_c0_guest_compare(cop0)         (cop0->reg[MIPS_CP0_COMPARE][0])
 349 #define kvm_write_c0_guest_compare(cop0, val)   (cop0->reg[MIPS_CP0_COMPARE][0] = (val))
 350 #define kvm_read_c0_guest_status(cop0)          (cop0->reg[MIPS_CP0_STATUS][0])
 351 #define kvm_write_c0_guest_status(cop0, val)    (cop0->reg[MIPS_CP0_STATUS][0] = (val))
 352 #define kvm_read_c0_guest_intctl(cop0)          (cop0->reg[MIPS_CP0_STATUS][1])
 353 #define kvm_write_c0_guest_intctl(cop0, val)    (cop0->reg[MIPS_CP0_STATUS][1] = (val))
 354 #define kvm_read_c0_guest_cause(cop0)           (cop0->reg[MIPS_CP0_CAUSE][0])
 355 #define kvm_write_c0_guest_cause(cop0, val)     (cop0->reg[MIPS_CP0_CAUSE][0] = (val))
 356 #define kvm_read_c0_guest_epc(cop0)             (cop0->reg[MIPS_CP0_EXC_PC][0])
 357 #define kvm_write_c0_guest_epc(cop0, val)       (cop0->reg[MIPS_CP0_EXC_PC][0] = (val))
 358 #define kvm_read_c0_guest_prid(cop0)            (cop0->reg[MIPS_CP0_PRID][0])
 359 #define kvm_write_c0_guest_prid(cop0, val)      (cop0->reg[MIPS_CP0_PRID][0] = (val))
 360 #define kvm_read_c0_guest_ebase(cop0)           (cop0->reg[MIPS_CP0_PRID][1])
 361 #define kvm_write_c0_guest_ebase(cop0, val)     (cop0->reg[MIPS_CP0_PRID][1] = (val))
 362 #define kvm_read_c0_guest_config(cop0)          (cop0->reg[MIPS_CP0_CONFIG][0])
 363 #define kvm_read_c0_guest_config1(cop0)         (cop0->reg[MIPS_CP0_CONFIG][1])
 364 #define kvm_read_c0_guest_config2(cop0)         (cop0->reg[MIPS_CP0_CONFIG][2])
 365 #define kvm_read_c0_guest_config3(cop0)         (cop0->reg[MIPS_CP0_CONFIG][3])
 366 #define kvm_read_c0_guest_config4(cop0)         (cop0->reg[MIPS_CP0_CONFIG][4])
 367 #define kvm_read_c0_guest_config5(cop0)         (cop0->reg[MIPS_CP0_CONFIG][5])
 368 #define kvm_read_c0_guest_config7(cop0)         (cop0->reg[MIPS_CP0_CONFIG][7])
 369 #define kvm_write_c0_guest_config(cop0, val)    (cop0->reg[MIPS_CP0_CONFIG][0] = (val))
 370 #define kvm_write_c0_guest_config1(cop0, val)   (cop0->reg[MIPS_CP0_CONFIG][1] = (val))
 371 #define kvm_write_c0_guest_config2(cop0, val)   (cop0->reg[MIPS_CP0_CONFIG][2] = (val))
 372 #define kvm_write_c0_guest_config3(cop0, val)   (cop0->reg[MIPS_CP0_CONFIG][3] = (val))
 373 #define kvm_write_c0_guest_config4(cop0, val)   (cop0->reg[MIPS_CP0_CONFIG][4] = (val))
 374 #define kvm_write_c0_guest_config5(cop0, val)   (cop0->reg[MIPS_CP0_CONFIG][5] = (val))
 375 #define kvm_write_c0_guest_config7(cop0, val)   (cop0->reg[MIPS_CP0_CONFIG][7] = (val))
 376 #define kvm_read_c0_guest_errorepc(cop0)        (cop0->reg[MIPS_CP0_ERROR_PC][0])
 377 #define kvm_write_c0_guest_errorepc(cop0, val)  (cop0->reg[MIPS_CP0_ERROR_PC][0] = (val))
 378 #define kvm_read_c0_guest_kscratch1(cop0)       (cop0->reg[MIPS_CP0_DESAVE][2])
 379 #define kvm_read_c0_guest_kscratch2(cop0)       (cop0->reg[MIPS_CP0_DESAVE][3])
 380 #define kvm_read_c0_guest_kscratch3(cop0)       (cop0->reg[MIPS_CP0_DESAVE][4])
 381 #define kvm_read_c0_guest_kscratch4(cop0)       (cop0->reg[MIPS_CP0_DESAVE][5])
 382 #define kvm_read_c0_guest_kscratch5(cop0)       (cop0->reg[MIPS_CP0_DESAVE][6])
 383 #define kvm_read_c0_guest_kscratch6(cop0)       (cop0->reg[MIPS_CP0_DESAVE][7])
 384 #define kvm_write_c0_guest_kscratch1(cop0, val) (cop0->reg[MIPS_CP0_DESAVE][2] = (val))
 385 #define kvm_write_c0_guest_kscratch2(cop0, val) (cop0->reg[MIPS_CP0_DESAVE][3] = (val))
 386 #define kvm_write_c0_guest_kscratch3(cop0, val) (cop0->reg[MIPS_CP0_DESAVE][4] = (val))
 387 #define kvm_write_c0_guest_kscratch4(cop0, val) (cop0->reg[MIPS_CP0_DESAVE][5] = (val))
 388 #define kvm_write_c0_guest_kscratch5(cop0, val) (cop0->reg[MIPS_CP0_DESAVE][6] = (val))
 389 #define kvm_write_c0_guest_kscratch6(cop0, val) (cop0->reg[MIPS_CP0_DESAVE][7] = (val))
 390
 391 /*
 392  * Some of the guest registers may be modified asynchronously (e.g. from a
 393  * hrtimer callback in hard irq context) and therefore need stronger atomicity
 394  * guarantees than other registers.
 395  */
 396
 397 static inline void _kvm_atomic_set_c0_guest_reg(unsigned long *reg,
 398                                                 unsigned long val)
 399 {
 400         unsigned long temp;
 401         do {
 402                 __asm__ __volatile__(
 403                 "       .set    mips3                           \n"
 404                 "       " __LL "%0, %1                          \n"
 405                 "       or      %0, %2                          \n"
 406                 "       " __SC  "%0, %1                         \n"
 407                 "       .set    mips0                           \n"
 408                 : "=&r" (temp), "+m" (*reg)
 409                 : "r" (val));
 410         } while (unlikely(!temp));
 411 }
 412
 413 static inline void _kvm_atomic_clear_c0_guest_reg(unsigned long *reg,
 414                                                   unsigned long val)
 415 {
 416         unsigned long temp;
 417         do {
 418                 __asm__ __volatile__(
 419                 "       .set    mips3                           \n"
 420                 "       " __LL "%0, %1                          \n"
 421                 "       and     %0, %2                          \n"
 422                 "       " __SC  "%0, %1                         \n"
 423                 "       .set    mips0                           \n"
 424                 : "=&r" (temp), "+m" (*reg)
 425                 : "r" (~val));
 426         } while (unlikely(!temp));
 427 }
 428
 429 static inline void _kvm_atomic_change_c0_guest_reg(unsigned long *reg,
 430                                                    unsigned long change,
 431                                                    unsigned long val)
 432 {
 433         unsigned long temp;
 434         do {
 435                 __asm__ __volatile__(
 436                 "       .set    mips3                           \n"
 437                 "       " __LL "%0, %1                          \n"
 438                 "       and     %0, %2                          \n"
 439                 "       or      %0, %3                          \n"
 440                 "       " __SC  "%0, %1                         \n"
 441                 "       .set    mips0                           \n"
 442                 : "=&r" (temp), "+m" (*reg)
 443                 : "r" (~change), "r" (val & change));
 444         } while (unlikely(!temp));
 445 }
 446
 447 #define kvm_set_c0_guest_status(cop0, val)      (cop0->reg[MIPS_CP0_STATUS][0] |= (val))
 448 #define kvm_clear_c0_guest_status(cop0, val)    (cop0->reg[MIPS_CP0_STATUS][0] &= ~(val))
 449
 450 /* Cause can be modified asynchronously from hardirq hrtimer callback */
 451 #define kvm_set_c0_guest_cause(cop0, val)                               \
 452         _kvm_atomic_set_c0_guest_reg(&cop0->reg[MIPS_CP0_CAUSE][0], val)
 453 #define kvm_clear_c0_guest_cause(cop0, val)                             \
 454         _kvm_atomic_clear_c0_guest_reg(&cop0->reg[MIPS_CP0_CAUSE][0], val)
 455 #define kvm_change_c0_guest_cause(cop0, change, val)                    \
 456         _kvm_atomic_change_c0_guest_reg(&cop0->reg[MIPS_CP0_CAUSE][0],  \
 457                                         change, val)
 458
 459 #define kvm_set_c0_guest_ebase(cop0, val)       (cop0->reg[MIPS_CP0_PRID][1] |= (val))
 460 #define kvm_clear_c0_guest_ebase(cop0, val)     (cop0->reg[MIPS_CP0_PRID][1] &= ~(val))
 461 #define kvm_change_c0_guest_ebase(cop0, change, val)                    \
 462 {                                                                       \
 463         kvm_clear_c0_guest_ebase(cop0, change);                         \
 464         kvm_set_c0_guest_ebase(cop0, ((val) & (change)));               \
 465 }
 466
 467 /* Helpers */
 468
 469 static inline bool kvm_mips_guest_can_have_fpu(struct kvm_vcpu_arch *vcpu)
 470 {
 471         return (!__builtin_constant_p(raw_cpu_has_fpu) || raw_cpu_has_fpu) &&
 472                 vcpu->fpu_enabled;
 473 }
 474
 475 static inline bool kvm_mips_guest_has_fpu(struct kvm_vcpu_arch *vcpu)
 476 {
 477         return kvm_mips_guest_can_have_fpu(vcpu) &&
 478                 kvm_read_c0_guest_config1(vcpu->cop0) & MIPS_CONF1_FP;
 479 }
 480
 481 static inline bool kvm_mips_guest_can_have_msa(struct kvm_vcpu_arch *vcpu)
 482 {
 483         return (!__builtin_constant_p(cpu_has_msa) || cpu_has_msa) &&
 484                 vcpu->msa_enabled;
 485 }
 486
 487 static inline bool kvm_mips_guest_has_msa(struct kvm_vcpu_arch *vcpu)
 488 {
 489         return kvm_mips_guest_can_have_msa(vcpu) &&
 490                 kvm_read_c0_guest_config3(vcpu->cop0) & MIPS_CONF3_MSA;
 491 }
 492
 493 struct kvm_mips_callbacks {
 494         int (*handle_cop_unusable)(struct kvm_vcpu *vcpu);
 495         int (*handle_tlb_mod)(struct kvm_vcpu *vcpu);
 496         int (*handle_tlb_ld_miss)(struct kvm_vcpu *vcpu);
 497         int (*handle_tlb_st_miss)(struct kvm_vcpu *vcpu);
 498         int (*handle_addr_err_st)(struct kvm_vcpu *vcpu);
 499         int (*handle_addr_err_ld)(struct kvm_vcpu *vcpu);
 500         int (*handle_syscall)(struct kvm_vcpu *vcpu);
 501         int (*handle_res_inst)(struct kvm_vcpu *vcpu);
 502         int (*handle_break)(struct kvm_vcpu *vcpu);
 503         int (*handle_trap)(struct kvm_vcpu *vcpu);
 504         int (*handle_msa_fpe)(struct kvm_vcpu *vcpu);
 505         int (*handle_fpe)(struct kvm_vcpu *vcpu);
 506         int (*handle_msa_disabled)(struct kvm_vcpu *vcpu);
 507         int (*vm_init)(struct kvm *kvm);
 508         int (*vcpu_init)(struct kvm_vcpu *vcpu);
 509         int (*vcpu_setup)(struct kvm_vcpu *vcpu);
 510         gpa_t (*gva_to_gpa)(gva_t gva);
 511         void (*queue_timer_int)(struct kvm_vcpu *vcpu);
 512         void (*dequeue_timer_int)(struct kvm_vcpu *vcpu);
 513         void (*queue_io_int)(struct kvm_vcpu *vcpu,
 514                              struct kvm_mips_interrupt *irq);
 515         void (*dequeue_io_int)(struct kvm_vcpu *vcpu,
 516                                struct kvm_mips_interrupt *irq);
 517         int (*irq_deliver)(struct kvm_vcpu *vcpu, unsigned int priority,
 518                            u32 cause);
 519         int (*irq_clear)(struct kvm_vcpu *vcpu, unsigned int priority,
 520                          u32 cause);
 521         unsigned long (*num_regs)(struct kvm_vcpu *vcpu);
 522         int (*copy_reg_indices)(struct kvm_vcpu *vcpu, u64 __user *indices);
 523         int (*get_one_reg)(struct kvm_vcpu *vcpu,
 524                            const struct kvm_one_reg *reg, s64 *v);
 525         int (*set_one_reg)(struct kvm_vcpu *vcpu,
 526                            const struct kvm_one_reg *reg, s64 v);
 527         int (*vcpu_get_regs)(struct kvm_vcpu *vcpu);
 528         int (*vcpu_set_regs)(struct kvm_vcpu *vcpu);
 529 };
 530 extern struct kvm_mips_callbacks *kvm_mips_callbacks;
 531 int kvm_mips_emulation_init(struct kvm_mips_callbacks **install_callbacks);
 532
 533 /* Debug: dump vcpu state */
 534 int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu);
 535
 536 extern int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu);
 537
 538 /* Building of entry/exception code */
 539 int kvm_mips_entry_setup(void);
 540 void *kvm_mips_build_vcpu_run(void *addr);
 541 void *kvm_mips_build_exception(void *addr, void *handler);
 542 void *kvm_mips_build_exit(void *addr);
 543
 544 /* FPU/MSA context management */
 545 void __kvm_save_fpu(struct kvm_vcpu_arch *vcpu);
 546 void __kvm_restore_fpu(struct kvm_vcpu_arch *vcpu);
 547 void __kvm_restore_fcsr(struct kvm_vcpu_arch *vcpu);
 548 void __kvm_save_msa(struct kvm_vcpu_arch *vcpu);
 549 void __kvm_restore_msa(struct kvm_vcpu_arch *vcpu);
 550 void __kvm_restore_msa_upper(struct kvm_vcpu_arch *vcpu);
 551 void __kvm_restore_msacsr(struct kvm_vcpu_arch *vcpu);
 552 void kvm_own_fpu(struct kvm_vcpu *vcpu);
 553 void kvm_own_msa(struct kvm_vcpu *vcpu);
 554 void kvm_drop_fpu(struct kvm_vcpu *vcpu);
 555 void kvm_lose_fpu(struct kvm_vcpu *vcpu);
 556
 557 /* TLB handling */
 558 u32 kvm_get_kernel_asid(struct kvm_vcpu *vcpu);
 559
 560 u32 kvm_get_user_asid(struct kvm_vcpu *vcpu);
 561
 562 u32 kvm_get_commpage_asid (struct kvm_vcpu *vcpu);
 563
 564 extern int kvm_mips_handle_kseg0_tlb_fault(unsigned long badbaddr,
 565                                            struct kvm_vcpu *vcpu);
 566
 567 extern int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr,
 568                                               struct kvm_vcpu *vcpu);
 569
 570 extern int kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu,
 571                                                 struct kvm_mips_tlb *tlb);
 572
 573 extern enum emulation_result kvm_mips_handle_tlbmiss(u32 cause,
 574                                                      u32 *opc,
 575                                                      struct kvm_run *run,
 576                                                      struct kvm_vcpu *vcpu);
 577
 578 extern enum emulation_result kvm_mips_handle_tlbmod(u32 cause,
 579                                                     u32 *opc,
 580                                                     struct kvm_run *run,
 581                                                     struct kvm_vcpu *vcpu);
 582
 583 extern void kvm_mips_dump_host_tlbs(void);
 584 extern void kvm_mips_dump_guest_tlbs(struct kvm_vcpu *vcpu);
 585 extern int kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi,
 586                                    unsigned long entrylo0,
 587                                    unsigned long entrylo1,
 588                                    int flush_dcache_mask);
 589 extern void kvm_mips_flush_host_tlb(int skip_kseg0);
 590 extern int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long entryhi);
 591
 592 extern int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu,
 593                                      unsigned long entryhi);
 594 extern int kvm_mips_host_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long vaddr);
 595 extern unsigned long kvm_mips_translate_guest_kseg0_to_hpa(struct kvm_vcpu *vcpu,
 596                                                    unsigned long gva);
 597 extern void kvm_get_new_mmu_context(struct mm_struct *mm, unsigned long cpu,
 598                                     struct kvm_vcpu *vcpu);
 599 extern void kvm_local_flush_tlb_all(void);
 600 extern void kvm_mips_alloc_new_mmu_context(struct kvm_vcpu *vcpu);
 601 extern void kvm_mips_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
 602 extern void kvm_mips_vcpu_put(struct kvm_vcpu *vcpu);
 603
 604 /* Emulation */
 605 u32 kvm_get_inst(u32 *opc, struct kvm_vcpu *vcpu);
 606 enum emulation_result update_pc(struct kvm_vcpu *vcpu, u32 cause);
 607
 608 extern enum emulation_result kvm_mips_emulate_inst(u32 cause,
 609                                                    u32 *opc,
 610                                                    struct kvm_run *run,
 611                                                    struct kvm_vcpu *vcpu);
 612
 613 extern enum emulation_result kvm_mips_emulate_syscall(u32 cause,
 614                                                       u32 *opc,
 615                                                       struct kvm_run *run,
 616                                                       struct kvm_vcpu *vcpu);
 617
 618 extern enum emulation_result kvm_mips_emulate_tlbmiss_ld(u32 cause,
 619                                                          u32 *opc,
 620                                                          struct kvm_run *run,
 621                                                          struct kvm_vcpu *vcpu);
 622
 623 extern enum emulation_result kvm_mips_emulate_tlbinv_ld(u32 cause,
 624                                                         u32 *opc,
 625                                                         struct kvm_run *run,
 626                                                         struct kvm_vcpu *vcpu);
 627
 628 extern enum emulation_result kvm_mips_emulate_tlbmiss_st(u32 cause,
 629                                                          u32 *opc,
 630                                                          struct kvm_run *run,
 631                                                          struct kvm_vcpu *vcpu);
 632
 633 extern enum emulation_result kvm_mips_emulate_tlbinv_st(u32 cause,
 634                                                         u32 *opc,
 635                                                         struct kvm_run *run,
 636                                                         struct kvm_vcpu *vcpu);
 637
 638 extern enum emulation_result kvm_mips_emulate_tlbmod(u32 cause,
 639                                                      u32 *opc,
 640                                                      struct kvm_run *run,
 641                                                      struct kvm_vcpu *vcpu);
 642
 643 extern enum emulation_result kvm_mips_emulate_fpu_exc(u32 cause,
 644                                                       u32 *opc,
 645                                                       struct kvm_run *run,
 646                                                       struct kvm_vcpu *vcpu);
 647
 648 extern enum emulation_result kvm_mips_handle_ri(u32 cause,
 649                                                 u32 *opc,
 650                                                 struct kvm_run *run,
 651                                                 struct kvm_vcpu *vcpu);
 652
 653 extern enum emulation_result kvm_mips_emulate_ri_exc(u32 cause,
 654                                                      u32 *opc,
 655                                                      struct kvm_run *run,
 656                                                      struct kvm_vcpu *vcpu);
 657
 658 extern enum emulation_result kvm_mips_emulate_bp_exc(u32 cause,
 659                                                      u32 *opc,
 660                                                      struct kvm_run *run,
 661                                                      struct kvm_vcpu *vcpu);
 662
 663 extern enum emulation_result kvm_mips_emulate_trap_exc(u32 cause,
 664                                                        u32 *opc,
 665                                                        struct kvm_run *run,
 666                                                        struct kvm_vcpu *vcpu);
 667
 668 extern enum emulation_result kvm_mips_emulate_msafpe_exc(u32 cause,
 669                                                          u32 *opc,
 670                                                          struct kvm_run *run,
 671                                                          struct kvm_vcpu *vcpu);
 672
 673 extern enum emulation_result kvm_mips_emulate_fpe_exc(u32 cause,
 674                                                       u32 *opc,
 675                                                       struct kvm_run *run,
 676                                                       struct kvm_vcpu *vcpu);
 677
 678 extern enum emulation_result kvm_mips_emulate_msadis_exc(u32 cause,
 679                                                          u32 *opc,
 680                                                          struct kvm_run *run,
 681                                                          struct kvm_vcpu *vcpu);
 682
 683 extern enum emulation_result kvm_mips_complete_mmio_load(struct kvm_vcpu *vcpu,
 684                                                          struct kvm_run *run);
 685
 686 u32 kvm_mips_read_count(struct kvm_vcpu *vcpu);
 687 void kvm_mips_write_count(struct kvm_vcpu *vcpu, u32 count);
 688 void kvm_mips_write_compare(struct kvm_vcpu *vcpu, u32 compare, bool ack);
 689 void kvm_mips_init_count(struct kvm_vcpu *vcpu);
 690 int kvm_mips_set_count_ctl(struct kvm_vcpu *vcpu, s64 count_ctl);
 691 int kvm_mips_set_count_resume(struct kvm_vcpu *vcpu, s64 count_resume);
 692 int kvm_mips_set_count_hz(struct kvm_vcpu *vcpu, s64 count_hz);
 693 void kvm_mips_count_enable_cause(struct kvm_vcpu *vcpu);
 694 void kvm_mips_count_disable_cause(struct kvm_vcpu *vcpu);
 695 enum hrtimer_restart kvm_mips_count_timeout(struct kvm_vcpu *vcpu);
 696
 697 enum emulation_result kvm_mips_check_privilege(u32 cause,
 698                                                u32 *opc,
 699                                                struct kvm_run *run,
 700                                                struct kvm_vcpu *vcpu);
 701
 702 enum emulation_result kvm_mips_emulate_cache(union mips_instruction inst,
 703                                              u32 *opc,
 704                                              u32 cause,
 705                                              struct kvm_run *run,
 706                                              struct kvm_vcpu *vcpu);
 707 enum emulation_result kvm_mips_emulate_CP0(union mips_instruction inst,
 708                                            u32 *opc,
 709                                            u32 cause,
 710                                            struct kvm_run *run,
 711                                            struct kvm_vcpu *vcpu);
 712 enum emulation_result kvm_mips_emulate_store(union mips_instruction inst,
 713                                              u32 cause,
 714                                              struct kvm_run *run,
 715                                              struct kvm_vcpu *vcpu);
 716 enum emulation_result kvm_mips_emulate_load(union mips_instruction inst,
 717                                             u32 cause,
 718                                             struct kvm_run *run,
 719                                             struct kvm_vcpu *vcpu);
 720
 721 unsigned int kvm_mips_config1_wrmask(struct kvm_vcpu *vcpu);
 722 unsigned int kvm_mips_config3_wrmask(struct kvm_vcpu *vcpu);
 723 unsigned int kvm_mips_config4_wrmask(struct kvm_vcpu *vcpu);
 724 unsigned int kvm_mips_config5_wrmask(struct kvm_vcpu *vcpu);
 725
 726 /* Dynamic binary translation */
 727 extern int kvm_mips_trans_cache_index(union mips_instruction inst,
 728                                       u32 *opc, struct kvm_vcpu *vcpu);
 729 extern int kvm_mips_trans_cache_va(union mips_instruction inst, u32 *opc,
 730                                    struct kvm_vcpu *vcpu);
 731 extern int kvm_mips_trans_mfc0(union mips_instruction inst, u32 *opc,
 732                                struct kvm_vcpu *vcpu);
 733 extern int kvm_mips_trans_mtc0(union mips_instruction inst, u32 *opc,
 734                                struct kvm_vcpu *vcpu);
 735
 736 /* Misc */
 737 extern void kvm_mips_dump_stats(struct kvm_vcpu *vcpu);
 738 extern unsigned long kvm_mips_get_ramsize(struct kvm *kvm);
 739
 740 static inline void kvm_arch_hardware_disable(void) {}
 741 static inline void kvm_arch_hardware_unsetup(void) {}
 742 static inline void kvm_arch_sync_events(struct kvm *kvm) {}
 743 static inline void kvm_arch_free_memslot(struct kvm *kvm,
 744                 struct kvm_memory_slot *free, struct kvm_memory_slot *dont) {}
 745 static inline void kvm_arch_memslots_updated(struct kvm *kvm, struct kvm_memslots *slots) {}
 746 static inline void kvm_arch_flush_shadow_all(struct kvm *kvm) {}
 747 static inline void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
 748                 struct kvm_memory_slot *slot) {}
 749 static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
 750 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
 751 static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {}
 752 static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) {}
 753 static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
 754
 755 #endif /* __MIPS_KVM_HOST_H__ */