linux/arch/x86/include/asm/paravirt_types.h
<<
>>
Prefs
   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_X86_PARAVIRT_TYPES_H
   3#define _ASM_X86_PARAVIRT_TYPES_H
   4
   5/* Bitmask of what can be clobbered: usually at least eax. */
   6#define CLBR_NONE 0
   7#define CLBR_EAX  (1 << 0)
   8#define CLBR_ECX  (1 << 1)
   9#define CLBR_EDX  (1 << 2)
  10#define CLBR_EDI  (1 << 3)
  11
  12#ifdef CONFIG_X86_32
  13/* CLBR_ANY should match all regs platform has. For i386, that's just it */
  14#define CLBR_ANY  ((1 << 4) - 1)
  15
  16#define CLBR_ARG_REGS   (CLBR_EAX | CLBR_EDX | CLBR_ECX)
  17#define CLBR_RET_REG    (CLBR_EAX | CLBR_EDX)
  18#define CLBR_SCRATCH    (0)
  19#else
  20#define CLBR_RAX  CLBR_EAX
  21#define CLBR_RCX  CLBR_ECX
  22#define CLBR_RDX  CLBR_EDX
  23#define CLBR_RDI  CLBR_EDI
  24#define CLBR_RSI  (1 << 4)
  25#define CLBR_R8   (1 << 5)
  26#define CLBR_R9   (1 << 6)
  27#define CLBR_R10  (1 << 7)
  28#define CLBR_R11  (1 << 8)
  29
  30#define CLBR_ANY  ((1 << 9) - 1)
  31
  32#define CLBR_ARG_REGS   (CLBR_RDI | CLBR_RSI | CLBR_RDX | \
  33                         CLBR_RCX | CLBR_R8 | CLBR_R9)
  34#define CLBR_RET_REG    (CLBR_RAX)
  35#define CLBR_SCRATCH    (CLBR_R10 | CLBR_R11)
  36
  37#endif /* X86_64 */
  38
  39#define CLBR_CALLEE_SAVE ((CLBR_ARG_REGS | CLBR_SCRATCH) & ~CLBR_RET_REG)
  40
  41#ifndef __ASSEMBLY__
  42
  43#include <asm/desc_defs.h>
  44#include <asm/kmap_types.h>
  45#include <asm/pgtable_types.h>
  46#include <asm/nospec-branch.h>
  47
  48struct page;
  49struct thread_struct;
  50struct desc_ptr;
  51struct tss_struct;
  52struct mm_struct;
  53struct desc_struct;
  54struct task_struct;
  55struct cpumask;
  56struct flush_tlb_info;
  57struct mmu_gather;
  58struct vm_area_struct;
  59
  60/*
  61 * Wrapper type for pointers to code which uses the non-standard
  62 * calling convention.  See PV_CALL_SAVE_REGS_THUNK below.
  63 */
  64struct paravirt_callee_save {
  65        void *func;
  66};
  67
  68/* general info */
  69struct pv_info {
  70#ifdef CONFIG_PARAVIRT_XXL
  71        unsigned int kernel_rpl;
  72        int shared_kernel_pmd;
  73
  74#ifdef CONFIG_X86_64
  75        u16 extra_user_64bit_cs;  /* __USER_CS if none */
  76#endif
  77#endif
  78
  79        const char *name;
  80};
  81
  82struct pv_init_ops {
  83        /*
  84         * Patch may replace one of the defined code sequences with
  85         * arbitrary code, subject to the same register constraints.
  86         * This generally means the code is not free to clobber any
  87         * registers other than EAX.  The patch function should return
  88         * the number of bytes of code generated, as we nop pad the
  89         * rest in generic code.
  90         */
  91        unsigned (*patch)(u8 type, void *insn_buff,
  92                          unsigned long addr, unsigned len);
  93} __no_randomize_layout;
  94
  95#ifdef CONFIG_PARAVIRT_XXL
  96struct pv_lazy_ops {
  97        /* Set deferred update mode, used for batching operations. */
  98        void (*enter)(void);
  99        void (*leave)(void);
 100        void (*flush)(void);
 101} __no_randomize_layout;
 102#endif
 103
 104struct pv_time_ops {
 105        unsigned long long (*sched_clock)(void);
 106        unsigned long long (*steal_clock)(int cpu);
 107} __no_randomize_layout;
 108
 109struct pv_cpu_ops {
 110        /* hooks for various privileged instructions */
 111        void (*io_delay)(void);
 112
 113#ifdef CONFIG_PARAVIRT_XXL
 114        unsigned long (*get_debugreg)(int regno);
 115        void (*set_debugreg)(int regno, unsigned long value);
 116
 117        unsigned long (*read_cr0)(void);
 118        void (*write_cr0)(unsigned long);
 119
 120        void (*write_cr4)(unsigned long);
 121
 122        /* Segment descriptor handling */
 123        void (*load_tr_desc)(void);
 124        void (*load_gdt)(const struct desc_ptr *);
 125        void (*load_idt)(const struct desc_ptr *);
 126        void (*set_ldt)(const void *desc, unsigned entries);
 127        unsigned long (*store_tr)(void);
 128        void (*load_tls)(struct thread_struct *t, unsigned int cpu);
 129#ifdef CONFIG_X86_64
 130        void (*load_gs_index)(unsigned int idx);
 131#endif
 132        void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum,
 133                                const void *desc);
 134        void (*write_gdt_entry)(struct desc_struct *,
 135                                int entrynum, const void *desc, int size);
 136        void (*write_idt_entry)(gate_desc *,
 137                                int entrynum, const gate_desc *gate);
 138        void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries);
 139        void (*free_ldt)(struct desc_struct *ldt, unsigned entries);
 140
 141        void (*load_sp0)(unsigned long sp0);
 142
 143        void (*set_iopl_mask)(unsigned mask);
 144
 145        void (*wbinvd)(void);
 146
 147        /* cpuid emulation, mostly so that caps bits can be disabled */
 148        void (*cpuid)(unsigned int *eax, unsigned int *ebx,
 149                      unsigned int *ecx, unsigned int *edx);
 150
 151        /* Unsafe MSR operations.  These will warn or panic on failure. */
 152        u64 (*read_msr)(unsigned int msr);
 153        void (*write_msr)(unsigned int msr, unsigned low, unsigned high);
 154
 155        /*
 156         * Safe MSR operations.
 157         * read sets err to 0 or -EIO.  write returns 0 or -EIO.
 158         */
 159        u64 (*read_msr_safe)(unsigned int msr, int *err);
 160        int (*write_msr_safe)(unsigned int msr, unsigned low, unsigned high);
 161
 162        u64 (*read_pmc)(int counter);
 163
 164        /*
 165         * Switch to usermode gs and return to 64-bit usermode using
 166         * sysret.  Only used in 64-bit kernels to return to 64-bit
 167         * processes.  Usermode register state, including %rsp, must
 168         * already be restored.
 169         */
 170        void (*usergs_sysret64)(void);
 171
 172        /* Normal iret.  Jump to this with the standard iret stack
 173           frame set up. */
 174        void (*iret)(void);
 175
 176        void (*swapgs)(void);
 177
 178        void (*start_context_switch)(struct task_struct *prev);
 179        void (*end_context_switch)(struct task_struct *next);
 180#endif
 181} __no_randomize_layout;
 182
 183struct pv_irq_ops {
 184#ifdef CONFIG_PARAVIRT_XXL
 185        /*
 186         * Get/set interrupt state.  save_fl and restore_fl are only
 187         * expected to use X86_EFLAGS_IF; all other bits
 188         * returned from save_fl are undefined, and may be ignored by
 189         * restore_fl.
 190         *
 191         * NOTE: These functions callers expect the callee to preserve
 192         * more registers than the standard C calling convention.
 193         */
 194        struct paravirt_callee_save save_fl;
 195        struct paravirt_callee_save restore_fl;
 196        struct paravirt_callee_save irq_disable;
 197        struct paravirt_callee_save irq_enable;
 198
 199        void (*safe_halt)(void);
 200        void (*halt)(void);
 201#endif
 202} __no_randomize_layout;
 203
 204struct pv_mmu_ops {
 205        /* TLB operations */
 206        void (*flush_tlb_user)(void);
 207        void (*flush_tlb_kernel)(void);
 208        void (*flush_tlb_one_user)(unsigned long addr);
 209        void (*flush_tlb_others)(const struct cpumask *cpus,
 210                                 const struct flush_tlb_info *info);
 211
 212        void (*tlb_remove_table)(struct mmu_gather *tlb, void *table);
 213
 214        /* Hook for intercepting the destruction of an mm_struct. */
 215        void (*exit_mmap)(struct mm_struct *mm);
 216
 217#ifdef CONFIG_PARAVIRT_XXL
 218        struct paravirt_callee_save read_cr2;
 219        void (*write_cr2)(unsigned long);
 220
 221        unsigned long (*read_cr3)(void);
 222        void (*write_cr3)(unsigned long);
 223
 224        /* Hooks for intercepting the creation/use of an mm_struct. */
 225        void (*activate_mm)(struct mm_struct *prev,
 226                            struct mm_struct *next);
 227        void (*dup_mmap)(struct mm_struct *oldmm,
 228                         struct mm_struct *mm);
 229
 230        /* Hooks for allocating and freeing a pagetable top-level */
 231        int  (*pgd_alloc)(struct mm_struct *mm);
 232        void (*pgd_free)(struct mm_struct *mm, pgd_t *pgd);
 233
 234        /*
 235         * Hooks for allocating/releasing pagetable pages when they're
 236         * attached to a pagetable
 237         */
 238        void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn);
 239        void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn);
 240        void (*alloc_pud)(struct mm_struct *mm, unsigned long pfn);
 241        void (*alloc_p4d)(struct mm_struct *mm, unsigned long pfn);
 242        void (*release_pte)(unsigned long pfn);
 243        void (*release_pmd)(unsigned long pfn);
 244        void (*release_pud)(unsigned long pfn);
 245        void (*release_p4d)(unsigned long pfn);
 246
 247        /* Pagetable manipulation functions */
 248        void (*set_pte)(pte_t *ptep, pte_t pteval);
 249        void (*set_pte_at)(struct mm_struct *mm, unsigned long addr,
 250                           pte_t *ptep, pte_t pteval);
 251        void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
 252
 253        pte_t (*ptep_modify_prot_start)(struct vm_area_struct *vma, unsigned long addr,
 254                                        pte_t *ptep);
 255        void (*ptep_modify_prot_commit)(struct vm_area_struct *vma, unsigned long addr,
 256                                        pte_t *ptep, pte_t pte);
 257
 258        struct paravirt_callee_save pte_val;
 259        struct paravirt_callee_save make_pte;
 260
 261        struct paravirt_callee_save pgd_val;
 262        struct paravirt_callee_save make_pgd;
 263
 264#if CONFIG_PGTABLE_LEVELS >= 3
 265#ifdef CONFIG_X86_PAE
 266        void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
 267        void (*pte_clear)(struct mm_struct *mm, unsigned long addr,
 268                          pte_t *ptep);
 269        void (*pmd_clear)(pmd_t *pmdp);
 270
 271#endif  /* CONFIG_X86_PAE */
 272
 273        void (*set_pud)(pud_t *pudp, pud_t pudval);
 274
 275        struct paravirt_callee_save pmd_val;
 276        struct paravirt_callee_save make_pmd;
 277
 278#if CONFIG_PGTABLE_LEVELS >= 4
 279        struct paravirt_callee_save pud_val;
 280        struct paravirt_callee_save make_pud;
 281
 282        void (*set_p4d)(p4d_t *p4dp, p4d_t p4dval);
 283
 284#if CONFIG_PGTABLE_LEVELS >= 5
 285        struct paravirt_callee_save p4d_val;
 286        struct paravirt_callee_save make_p4d;
 287
 288        void (*set_pgd)(pgd_t *pgdp, pgd_t pgdval);
 289#endif  /* CONFIG_PGTABLE_LEVELS >= 5 */
 290
 291#endif  /* CONFIG_PGTABLE_LEVELS >= 4 */
 292
 293#endif  /* CONFIG_PGTABLE_LEVELS >= 3 */
 294
 295        struct pv_lazy_ops lazy_mode;
 296
 297        /* dom0 ops */
 298
 299        /* Sometimes the physical address is a pfn, and sometimes its
 300           an mfn.  We can tell which is which from the index. */
 301        void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
 302                           phys_addr_t phys, pgprot_t flags);
 303#endif
 304} __no_randomize_layout;
 305
 306struct arch_spinlock;
 307#ifdef CONFIG_SMP
 308#include <asm/spinlock_types.h>
 309#endif
 310
 311struct qspinlock;
 312
 313struct pv_lock_ops {
 314        void (*queued_spin_lock_slowpath)(struct qspinlock *lock, u32 val);
 315        struct paravirt_callee_save queued_spin_unlock;
 316
 317        void (*wait)(u8 *ptr, u8 val);
 318        void (*kick)(int cpu);
 319
 320        struct paravirt_callee_save vcpu_is_preempted;
 321} __no_randomize_layout;
 322
 323/* This contains all the paravirt structures: we get a convenient
 324 * number for each function using the offset which we use to indicate
 325 * what to patch. */
 326struct paravirt_patch_template {
 327        struct pv_init_ops      init;
 328        struct pv_time_ops      time;
 329        struct pv_cpu_ops       cpu;
 330        struct pv_irq_ops       irq;
 331        struct pv_mmu_ops       mmu;
 332        struct pv_lock_ops      lock;
 333} __no_randomize_layout;
 334
 335extern struct pv_info pv_info;
 336extern struct paravirt_patch_template pv_ops;
 337
 338#define PARAVIRT_PATCH(x)                                       \
 339        (offsetof(struct paravirt_patch_template, x) / sizeof(void *))
 340
 341#define paravirt_type(op)                               \
 342        [paravirt_typenum] "i" (PARAVIRT_PATCH(op)),    \
 343        [paravirt_opptr] "i" (&(pv_ops.op))
 344#define paravirt_clobber(clobber)               \
 345        [paravirt_clobber] "i" (clobber)
 346
 347/*
 348 * Generate some code, and mark it as patchable by the
 349 * apply_paravirt() alternate instruction patcher.
 350 */
 351#define _paravirt_alt(insn_string, type, clobber)       \
 352        "771:\n\t" insn_string "\n" "772:\n"            \
 353        ".pushsection .parainstructions,\"a\"\n"        \
 354        _ASM_ALIGN "\n"                                 \
 355        _ASM_PTR " 771b\n"                              \
 356        "  .byte " type "\n"                            \
 357        "  .byte 772b-771b\n"                           \
 358        "  .short " clobber "\n"                        \
 359        ".popsection\n"
 360
 361/* Generate patchable code, with the default asm parameters. */
 362#define paravirt_alt(insn_string)                                       \
 363        _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
 364
 365/* Simple instruction patching code. */
 366#define NATIVE_LABEL(a,x,b) "\n\t.globl " a #x "_" #b "\n" a #x "_" #b ":\n\t"
 367
 368unsigned paravirt_patch_ident_64(void *insn_buff, unsigned len);
 369unsigned paravirt_patch_default(u8 type, void *insn_buff, unsigned long addr, unsigned len);
 370unsigned paravirt_patch_insns(void *insn_buff, unsigned len, const char *start, const char *end);
 371
 372unsigned native_patch(u8 type, void *insn_buff, unsigned long addr, unsigned len);
 373
 374int paravirt_disable_iospace(void);
 375
 376/*
 377 * This generates an indirect call based on the operation type number.
 378 * The type number, computed in PARAVIRT_PATCH, is derived from the
 379 * offset into the paravirt_patch_template structure, and can therefore be
 380 * freely converted back into a structure offset.
 381 */
 382#define PARAVIRT_CALL                                   \
 383        ANNOTATE_RETPOLINE_SAFE                         \
 384        "call *%c[paravirt_opptr];"
 385
 386/*
 387 * These macros are intended to wrap calls through one of the paravirt
 388 * ops structs, so that they can be later identified and patched at
 389 * runtime.
 390 *
 391 * Normally, a call to a pv_op function is a simple indirect call:
 392 * (pv_op_struct.operations)(args...).
 393 *
 394 * Unfortunately, this is a relatively slow operation for modern CPUs,
 395 * because it cannot necessarily determine what the destination
 396 * address is.  In this case, the address is a runtime constant, so at
 397 * the very least we can patch the call to e a simple direct call, or
 398 * ideally, patch an inline implementation into the callsite.  (Direct
 399 * calls are essentially free, because the call and return addresses
 400 * are completely predictable.)
 401 *
 402 * For i386, these macros rely on the standard gcc "regparm(3)" calling
 403 * convention, in which the first three arguments are placed in %eax,
 404 * %edx, %ecx (in that order), and the remaining arguments are placed
 405 * on the stack.  All caller-save registers (eax,edx,ecx) are expected
 406 * to be modified (either clobbered or used for return values).
 407 * X86_64, on the other hand, already specifies a register-based calling
 408 * conventions, returning at %rax, with parameteres going on %rdi, %rsi,
 409 * %rdx, and %rcx. Note that for this reason, x86_64 does not need any
 410 * special handling for dealing with 4 arguments, unlike i386.
 411 * However, x86_64 also have to clobber all caller saved registers, which
 412 * unfortunately, are quite a bit (r8 - r11)
 413 *
 414 * The call instruction itself is marked by placing its start address
 415 * and size into the .parainstructions section, so that
 416 * apply_paravirt() in arch/i386/kernel/alternative.c can do the
 417 * appropriate patching under the control of the backend pv_init_ops
 418 * implementation.
 419 *
 420 * Unfortunately there's no way to get gcc to generate the args setup
 421 * for the call, and then allow the call itself to be generated by an
 422 * inline asm.  Because of this, we must do the complete arg setup and
 423 * return value handling from within these macros.  This is fairly
 424 * cumbersome.
 425 *
 426 * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
 427 * It could be extended to more arguments, but there would be little
 428 * to be gained from that.  For each number of arguments, there are
 429 * the two VCALL and CALL variants for void and non-void functions.
 430 *
 431 * When there is a return value, the invoker of the macro must specify
 432 * the return type.  The macro then uses sizeof() on that type to
 433 * determine whether its a 32 or 64 bit value, and places the return
 434 * in the right register(s) (just %eax for 32-bit, and %edx:%eax for
 435 * 64-bit). For x86_64 machines, it just returns at %rax regardless of
 436 * the return value size.
 437 *
 438 * 64-bit arguments are passed as a pair of adjacent 32-bit arguments
 439 * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments
 440 * in low,high order
 441 *
 442 * Small structures are passed and returned in registers.  The macro
 443 * calling convention can't directly deal with this, so the wrapper
 444 * functions must do this.
 445 *
 446 * These PVOP_* macros are only defined within this header.  This
 447 * means that all uses must be wrapped in inline functions.  This also
 448 * makes sure the incoming and outgoing types are always correct.
 449 */
 450#ifdef CONFIG_X86_32
 451#define PVOP_VCALL_ARGS                                                 \
 452        unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx;
 453
 454#define PVOP_CALL_ARGS                  PVOP_VCALL_ARGS
 455
 456#define PVOP_CALL_ARG1(x)               "a" ((unsigned long)(x))
 457#define PVOP_CALL_ARG2(x)               "d" ((unsigned long)(x))
 458#define PVOP_CALL_ARG3(x)               "c" ((unsigned long)(x))
 459
 460#define PVOP_VCALL_CLOBBERS             "=a" (__eax), "=d" (__edx),     \
 461                                        "=c" (__ecx)
 462#define PVOP_CALL_CLOBBERS              PVOP_VCALL_CLOBBERS
 463
 464#define PVOP_VCALLEE_CLOBBERS           "=a" (__eax), "=d" (__edx)
 465#define PVOP_CALLEE_CLOBBERS            PVOP_VCALLEE_CLOBBERS
 466
 467#define EXTRA_CLOBBERS
 468#define VEXTRA_CLOBBERS
 469#else  /* CONFIG_X86_64 */
 470/* [re]ax isn't an arg, but the return val */
 471#define PVOP_VCALL_ARGS                                         \
 472        unsigned long __edi = __edi, __esi = __esi,             \
 473                __edx = __edx, __ecx = __ecx, __eax = __eax;
 474
 475#define PVOP_CALL_ARGS          PVOP_VCALL_ARGS
 476
 477#define PVOP_CALL_ARG1(x)               "D" ((unsigned long)(x))
 478#define PVOP_CALL_ARG2(x)               "S" ((unsigned long)(x))
 479#define PVOP_CALL_ARG3(x)               "d" ((unsigned long)(x))
 480#define PVOP_CALL_ARG4(x)               "c" ((unsigned long)(x))
 481
 482#define PVOP_VCALL_CLOBBERS     "=D" (__edi),                           \
 483                                "=S" (__esi), "=d" (__edx),             \
 484                                "=c" (__ecx)
 485#define PVOP_CALL_CLOBBERS      PVOP_VCALL_CLOBBERS, "=a" (__eax)
 486
 487/* void functions are still allowed [re]ax for scratch */
 488#define PVOP_VCALLEE_CLOBBERS   "=a" (__eax)
 489#define PVOP_CALLEE_CLOBBERS    PVOP_VCALLEE_CLOBBERS
 490
 491#define EXTRA_CLOBBERS   , "r8", "r9", "r10", "r11"
 492#define VEXTRA_CLOBBERS  , "rax", "r8", "r9", "r10", "r11"
 493#endif  /* CONFIG_X86_32 */
 494
 495#ifdef CONFIG_PARAVIRT_DEBUG
 496#define PVOP_TEST_NULL(op)      BUG_ON(pv_ops.op == NULL)
 497#else
 498#define PVOP_TEST_NULL(op)      ((void)pv_ops.op)
 499#endif
 500
 501#define PVOP_RETMASK(rettype)                                           \
 502        ({      unsigned long __mask = ~0UL;                            \
 503                switch (sizeof(rettype)) {                              \
 504                case 1: __mask =       0xffUL; break;                   \
 505                case 2: __mask =     0xffffUL; break;                   \
 506                case 4: __mask = 0xffffffffUL; break;                   \
 507                default: break;                                         \
 508                }                                                       \
 509                __mask;                                                 \
 510        })
 511
 512
 513#define ____PVOP_CALL(rettype, op, clbr, call_clbr, extra_clbr,         \
 514                      pre, post, ...)                                   \
 515        ({                                                              \
 516                rettype __ret;                                          \
 517                PVOP_CALL_ARGS;                                         \
 518                PVOP_TEST_NULL(op);                                     \
 519                /* This is 32-bit specific, but is okay in 64-bit */    \
 520                /* since this condition will never hold */              \
 521                if (sizeof(rettype) > sizeof(unsigned long)) {          \
 522                        asm volatile(pre                                \
 523                                     paravirt_alt(PARAVIRT_CALL)        \
 524                                     post                               \
 525                                     : call_clbr, ASM_CALL_CONSTRAINT   \
 526                                     : paravirt_type(op),               \
 527                                       paravirt_clobber(clbr),          \
 528                                       ##__VA_ARGS__                    \
 529                                     : "memory", "cc" extra_clbr);      \
 530                        __ret = (rettype)((((u64)__edx) << 32) | __eax); \
 531                } else {                                                \
 532                        asm volatile(pre                                \
 533                                     paravirt_alt(PARAVIRT_CALL)        \
 534                                     post                               \
 535                                     : call_clbr, ASM_CALL_CONSTRAINT   \
 536                                     : paravirt_type(op),               \
 537                                       paravirt_clobber(clbr),          \
 538                                       ##__VA_ARGS__                    \
 539                                     : "memory", "cc" extra_clbr);      \
 540                        __ret = (rettype)(__eax & PVOP_RETMASK(rettype));       \
 541                }                                                       \
 542                __ret;                                                  \
 543        })
 544
 545#define __PVOP_CALL(rettype, op, pre, post, ...)                        \
 546        ____PVOP_CALL(rettype, op, CLBR_ANY, PVOP_CALL_CLOBBERS,        \
 547                      EXTRA_CLOBBERS, pre, post, ##__VA_ARGS__)
 548
 549#define __PVOP_CALLEESAVE(rettype, op, pre, post, ...)                  \
 550        ____PVOP_CALL(rettype, op.func, CLBR_RET_REG,                   \
 551                      PVOP_CALLEE_CLOBBERS, ,                           \
 552                      pre, post, ##__VA_ARGS__)
 553
 554
 555#define ____PVOP_VCALL(op, clbr, call_clbr, extra_clbr, pre, post, ...) \
 556        ({                                                              \
 557                PVOP_VCALL_ARGS;                                        \
 558                PVOP_TEST_NULL(op);                                     \
 559                asm volatile(pre                                        \
 560                             paravirt_alt(PARAVIRT_CALL)                \
 561                             post                                       \
 562                             : call_clbr, ASM_CALL_CONSTRAINT           \
 563                             : paravirt_type(op),                       \
 564                               paravirt_clobber(clbr),                  \
 565                               ##__VA_ARGS__                            \
 566                             : "memory", "cc" extra_clbr);              \
 567        })
 568
 569#define __PVOP_VCALL(op, pre, post, ...)                                \
 570        ____PVOP_VCALL(op, CLBR_ANY, PVOP_VCALL_CLOBBERS,               \
 571                       VEXTRA_CLOBBERS,                                 \
 572                       pre, post, ##__VA_ARGS__)
 573
 574#define __PVOP_VCALLEESAVE(op, pre, post, ...)                          \
 575        ____PVOP_VCALL(op.func, CLBR_RET_REG,                           \
 576                      PVOP_VCALLEE_CLOBBERS, ,                          \
 577                      pre, post, ##__VA_ARGS__)
 578
 579
 580
 581#define PVOP_CALL0(rettype, op)                                         \
 582        __PVOP_CALL(rettype, op, "", "")
 583#define PVOP_VCALL0(op)                                                 \
 584        __PVOP_VCALL(op, "", "")
 585
 586#define PVOP_CALLEE0(rettype, op)                                       \
 587        __PVOP_CALLEESAVE(rettype, op, "", "")
 588#define PVOP_VCALLEE0(op)                                               \
 589        __PVOP_VCALLEESAVE(op, "", "")
 590
 591
 592#define PVOP_CALL1(rettype, op, arg1)                                   \
 593        __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
 594#define PVOP_VCALL1(op, arg1)                                           \
 595        __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1))
 596
 597#define PVOP_CALLEE1(rettype, op, arg1)                                 \
 598        __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
 599#define PVOP_VCALLEE1(op, arg1)                                         \
 600        __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1))
 601
 602
 603#define PVOP_CALL2(rettype, op, arg1, arg2)                             \
 604        __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1),          \
 605                    PVOP_CALL_ARG2(arg2))
 606#define PVOP_VCALL2(op, arg1, arg2)                                     \
 607        __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1),                  \
 608                     PVOP_CALL_ARG2(arg2))
 609
 610#define PVOP_CALLEE2(rettype, op, arg1, arg2)                           \
 611        __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1),    \
 612                          PVOP_CALL_ARG2(arg2))
 613#define PVOP_VCALLEE2(op, arg1, arg2)                                   \
 614        __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1),            \
 615                           PVOP_CALL_ARG2(arg2))
 616
 617
 618#define PVOP_CALL3(rettype, op, arg1, arg2, arg3)                       \
 619        __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1),          \
 620                    PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
 621#define PVOP_VCALL3(op, arg1, arg2, arg3)                               \
 622        __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1),                  \
 623                     PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
 624
 625/* This is the only difference in x86_64. We can make it much simpler */
 626#ifdef CONFIG_X86_32
 627#define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)                 \
 628        __PVOP_CALL(rettype, op,                                        \
 629                    "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
 630                    PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),         \
 631                    PVOP_CALL_ARG3(arg3), [_arg4] "mr" ((u32)(arg4)))
 632#define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)                         \
 633        __PVOP_VCALL(op,                                                \
 634                    "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
 635                    "0" ((u32)(arg1)), "1" ((u32)(arg2)),               \
 636                    "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
 637#else
 638#define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)                 \
 639        __PVOP_CALL(rettype, op, "", "",                                \
 640                    PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),         \
 641                    PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
 642#define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)                         \
 643        __PVOP_VCALL(op, "", "",                                        \
 644                     PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),        \
 645                     PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
 646#endif
 647
 648/* Lazy mode for batching updates / context switch */
 649enum paravirt_lazy_mode {
 650        PARAVIRT_LAZY_NONE,
 651        PARAVIRT_LAZY_MMU,
 652        PARAVIRT_LAZY_CPU,
 653};
 654
 655enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
 656void paravirt_start_context_switch(struct task_struct *prev);
 657void paravirt_end_context_switch(struct task_struct *next);
 658
 659void paravirt_enter_lazy_mmu(void);
 660void paravirt_leave_lazy_mmu(void);
 661void paravirt_flush_lazy_mmu(void);
 662
 663void _paravirt_nop(void);
 664u64 _paravirt_ident_64(u64);
 665
 666#define paravirt_nop    ((void *)_paravirt_nop)
 667
 668/* These all sit in the .parainstructions section to tell us what to patch. */
 669struct paravirt_patch_site {
 670        u8 *instr;              /* original instructions */
 671        u8 type;                /* type of this instruction */
 672        u8 len;                 /* length of original instruction */
 673};
 674
 675extern struct paravirt_patch_site __parainstructions[],
 676        __parainstructions_end[];
 677
 678#endif  /* __ASSEMBLY__ */
 679
 680#endif  /* _ASM_X86_PARAVIRT_TYPES_H */
 681