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/* SPDX-License-Identifier: GPL-2.0 / /***************************************************************************** * x86_emulate.h * * Generic x86 (32-bit and 64-bit) instruction decoder and emulator. * * Copyright (c) 2005 Keir Fraser * * From: xen-unstable 10676:af9809f51f81a3c43f276f00c81a52ef558afda4 / #ifndef _ASM_X86_KVM_X86_EMULATE_H #define _ASM_X86_KVM_X86_EMULATE_H #include <asm/desc_defs.h> struct x86_emulate_ctxt; enum x86_intercept; enum x86_intercept_stage; struct x86_exception { u8 vector; bool error_code_valid; u16 error_code; bool nested_page_fault; u64 address; / cr2 or nested page fault gpa / u8 async_page_fault; }; / * This struct is used to carry enough information from the instruction * decoder to main KVM so that a decision can be made whether the * instruction needs to be intercepted or not. / struct x86_instruction_info { u8 intercept; / which intercept / u8 rep_prefix; / rep prefix? / u8 modrm_mod; / mod part of modrm / u8 modrm_reg; / index of register used / u8 modrm_rm; / rm part of modrm / u64 src_val; / value of source operand / u64 dst_val; / value of destination operand / u8 src_bytes; / size of source operand / u8 dst_bytes; / size of destination operand / u8 ad_bytes; / size of src/dst address / u64 next_rip; / rip following the instruction / }; / * x86_emulate_ops: * * These operations represent the instruction emulator's interface to memory. * There are two categories of operation: those that act on ordinary memory * regions (_std), and those that act on memory regions known to require special treatment or emulation (_emulated). * The emulator assumes that an instruction accesses only one 'emulated memory' * location, that this location is the given linear faulting address (cr2), and * that this is one of the instruction's data operands. Instruction fetches and * stack operations are assumed never to access emulated memory. The emulator * automatically deduces which operand of a string-move operation is accessing * emulated memory, and assumes that the other operand accesses normal memory. * * NOTES: * 1. The emulator isn't very smart about emulated vs. standard memory. * 'Emulated memory' access addresses should be checked for sanity. * 'Normal memory' accesses may fault, and the caller must arrange to * detect and handle reentrancy into the emulator via recursive faults. * Accesses may be unaligned and may cross page boundaries. * 2. If the access fails (cannot emulate, or a standard access faults) then * it is up to the memop to propagate the fault to the guest VM via * some out-of-band mechanism, unknown to the emulator. The memop signals * failure by returning X86EMUL_PROPAGATE_FAULT to the emulator, which will * then immediately bail. * 3. Valid access sizes are 1, 2, 4 and 8 bytes. On x86/32 systems only * cmpxchg8b_emulated need support 8-byte accesses. * 4. The emulator cannot handle 64-bit mode emulation on an x86/32 system. / / Access completed successfully: continue emulation as normal. / #define X86EMUL_CONTINUE 0 / Access is unhandleable: bail from emulation and return error to caller. / #define X86EMUL_UNHANDLEABLE 1 / Terminate emulation but return success to the caller. / #define X86EMUL_PROPAGATE_FAULT 2 / propagate a generated fault to guest / #define X86EMUL_RETRY_INSTR 3 / retry the instruction for some reason / #define X86EMUL_CMPXCHG_FAILED 4 / cmpxchg did not see expected value / #define X86EMUL_IO_NEEDED 5 / IO is needed to complete emulation / #define X86EMUL_INTERCEPTED 6 / Intercepted by nested VMCB/VMCS / struct x86_emulate_ops { / * read_gpr: read a general purpose register (rax - r15) * * @reg: gpr number. / ulong (read_gpr)(struct x86_emulate_ctxt ctxt, unsigned reg); / * write_gpr: write a general purpose register (rax - r15) * * @reg: gpr number. * @val: value to write. / void (write_gpr)(struct x86_emulate_ctxt ctxt, unsigned reg, ulong val); / * read_std: Read bytes of standard (non-emulated/special) memory. * Used for descriptor reading. * @addr: [IN ] Linear address from which to read. * @val: [OUT] Value read from memory, zero-extended to 'u_long'. * @bytes: [IN ] Number of bytes to read from memory. * @system:[IN ] Whether the access is forced to be at CPL0. / int (read_std)(struct x86_emulate_ctxt ctxt, unsigned long addr, void val, unsigned int bytes, struct x86_exception fault, bool system); / * read_phys: Read bytes of standard (non-emulated/special) memory. * Used for descriptor reading. * @addr: [IN ] Physical address from which to read. * @val: [OUT] Value read from memory. * @bytes: [IN ] Number of bytes to read from memory. / int (read_phys)(struct x86_emulate_ctxt ctxt, unsigned long addr, void val, unsigned int bytes); /* * write_std: Write bytes of standard (non-emulated/special) memory. * Used for descriptor writing. * @addr: [IN ] Linear address to which to write. * @val: [OUT] Value write to memory, zero-extended to 'u_long'. * @bytes: [IN ] Number of bytes to write to memory. * @system:[IN ] Whether the access is forced to be at CPL0. / int (write_std)(struct x86_emulate_ctxt ctxt, unsigned long addr, void val, unsigned int bytes, struct x86_exception fault, bool system); / * fetch: Read bytes of standard (non-emulated/special) memory. * Used for instruction fetch. * @addr: [IN ] Linear address from which to read. * @val: [OUT] Value read from memory, zero-extended to 'u_long'. * @bytes: [IN ] Number of bytes to read from memory. / int (fetch)(struct x86_emulate_ctxt ctxt, unsigned long addr, void val, unsigned int bytes, struct x86_exception fault); / * read_emulated: Read bytes from emulated/special memory area. * @addr: [IN ] Linear address from which to read. * @val: [OUT] Value read from memory, zero-extended to 'u_long'. * @bytes: [IN ] Number of bytes to read from memory. / int (read_emulated)(struct x86_emulate_ctxt ctxt, unsigned long addr, void val, unsigned int bytes, struct x86_exception fault); / * write_emulated: Write bytes to emulated/special memory area. * @addr: [IN ] Linear address to which to write. * @val: [IN ] Value to write to memory (low-order bytes used as * required). * @bytes: [IN ] Number of bytes to write to memory. / int (write_emulated)(struct x86_emulate_ctxt ctxt, unsigned long addr, const void val, unsigned int bytes, struct x86_exception fault); / * cmpxchg_emulated: Emulate an atomic (LOCKed) CMPXCHG operation on an * emulated/special memory area. * @addr: [IN ] Linear address to access. * @old: [IN ] Value expected to be current at @addr. * @new: [IN ] Value to write to @addr. * @bytes: [IN ] Number of bytes to access using CMPXCHG. / int (cmpxchg_emulated)(struct x86_emulate_ctxt ctxt, unsigned long addr, const void old, const void new, unsigned int bytes, struct x86_exception fault); void (invlpg)(struct x86_emulate_ctxt ctxt, ulong addr); int (pio_in_emulated)(struct x86_emulate_ctxt ctxt, int size, unsigned short port, void val, unsigned int count); int (pio_out_emulated)(struct x86_emulate_ctxt ctxt, int size, unsigned short port, const void val, unsigned int count); bool (get_segment)(struct x86_emulate_ctxt ctxt, u16 selector, struct desc_struct desc, u32 base3, int seg); void (set_segment)(struct x86_emulate_ctxt ctxt, u16 selector, struct desc_struct desc, u32 base3, int seg); unsigned long (get_cached_segment_base)(struct x86_emulate_ctxt ctxt, int seg); void (get_gdt)(struct x86_emulate_ctxt ctxt, struct desc_ptr dt); void (get_idt)(struct x86_emulate_ctxt ctxt, struct desc_ptr dt); void (set_gdt)(struct x86_emulate_ctxt ctxt, struct desc_ptr dt); void (set_idt)(struct x86_emulate_ctxt ctxt, struct desc_ptr dt); ulong (get_cr)(struct x86_emulate_ctxt ctxt, int cr); int (set_cr)(struct x86_emulate_ctxt ctxt, int cr, ulong val); int (cpl)(struct x86_emulate_ctxt ctxt); int (get_dr)(struct x86_emulate_ctxt ctxt, int dr, ulong dest); int (set_dr)(struct x86_emulate_ctxt ctxt, int dr, ulong value); u64 (get_smbase)(struct x86_emulate_ctxt ctxt); void (set_smbase)(struct x86_emulate_ctxt ctxt, u64 smbase); int (set_msr)(struct x86_emulate_ctxt ctxt, u32 msr_index, u64 data); int (get_msr)(struct x86_emulate_ctxt ctxt, u32 msr_index, u64 pdata); int (check_pmc)(struct x86_emulate_ctxt ctxt, u32 pmc); int (read_pmc)(struct x86_emulate_ctxt ctxt, u32 pmc, u64 pdata); void (halt)(struct x86_emulate_ctxt ctxt); void (wbinvd)(struct x86_emulate_ctxt ctxt); int (fix_hypercall)(struct x86_emulate_ctxt ctxt); int (intercept)(struct x86_emulate_ctxt ctxt, struct x86_instruction_info info, enum x86_intercept_stage stage); bool (get_cpuid)(struct x86_emulate_ctxt ctxt, u32 eax, u32 ebx, u32 ecx, u32 edx, bool check_limit); void (set_nmi_mask)(struct x86_emulate_ctxt ctxt, bool masked); unsigned (get_hflags)(struct x86_emulate_ctxt ctxt); void (set_hflags)(struct x86_emulate_ctxt ctxt, unsigned hflags); int (pre_leave_smm)(struct x86_emulate_ctxt ctxt, const char smstate); void (post_leave_smm)(struct x86_emulate_ctxt ctxt); int (set_xcr)(struct x86_emulate_ctxt ctxt, u32 index, u64 xcr); }; typedef u32 __attribute__((vector_size(16))) sse128_t; / Type, address-of, and value of an instruction's operand. / struct operand { enum { OP_REG, OP_MEM, OP_MEM_STR, OP_IMM, OP_XMM, OP_MM, OP_NONE } type; unsigned int bytes; unsigned int count; union { unsigned long orig_val; u64 orig_val64; }; union { unsigned long reg; struct segmented_address { ulong ea; unsigned seg; } mem; unsigned xmm; unsigned mm; } addr; union { unsigned long val; u64 val64; char valptr[sizeof(sse128_t)]; sse128_t vec_val; u64 mm_val; void data; }; }; struct fetch_cache { u8 data[15]; u8 ptr; u8 end; }; struct read_cache { u8 data[1024]; unsigned long pos; unsigned long end; }; / Execution mode, passed to the emulator. / enum x86emul_mode { X86EMUL_MODE_REAL, / Real mode. / X86EMUL_MODE_VM86, / Virtual 8086 mode. / X86EMUL_MODE_PROT16, / 16-bit protected mode. / X86EMUL_MODE_PROT32, / 32-bit protected mode. / X86EMUL_MODE_PROT64, / 64-bit (long) mode. / }; / These match some of the HF_* flags defined in kvm_host.h / #define X86EMUL_GUEST_MASK (1 << 5) / VCPU is in guest-mode / #define X86EMUL_SMM_MASK (1 << 6) #define X86EMUL_SMM_INSIDE_NMI_MASK (1 << 7) struct x86_emulate_ctxt { const struct x86_emulate_ops ops; /* Register state before/after emulation. / unsigned long eflags; unsigned long eip; / eip before instruction emulation / / Emulated execution mode, represented by an X86EMUL_MODE value. / enum x86emul_mode mode; / interruptibility state, as a result of execution of STI or MOV SS / int interruptibility; bool perm_ok; / do not check permissions if true / bool ud; / inject an #UD if host doesn't support insn / bool tf; / TF value before instruction (after for syscall/sysret) / bool have_exception; struct x86_exception exception; / * decode cache / / current opcode length in bytes / u8 opcode_len; u8 b; u8 intercept; u8 op_bytes; u8 ad_bytes; struct operand src; struct operand src2; struct operand dst; int (execute)(struct x86_emulate_ctxt ctxt); int (check_perm)(struct x86_emulate_ctxt ctxt); / * The following six fields are cleared together, * the rest are initialized unconditionally in x86_decode_insn * or elsewhere / bool rip_relative; u8 rex_prefix; u8 lock_prefix; u8 rep_prefix; / bitmaps of registers in _regs[] that can be read / u32 regs_valid; / bitmaps of registers in _regs[] that have been written / u32 regs_dirty; / modrm / u8 modrm; u8 modrm_mod; u8 modrm_reg; u8 modrm_rm; u8 modrm_seg; u8 seg_override; u64 d; unsigned long _eip; struct operand memop; / Fields above regs are cleared together. / unsigned long _regs[NR_VCPU_REGS]; struct operand memopp; struct fetch_cache fetch; struct read_cache io_read; struct read_cache mem_read; }; /* Repeat String Operation Prefix / #define REPE_PREFIX 0xf3 #define REPNE_PREFIX 0xf2 / CPUID vendors / #define X86EMUL_CPUID_VENDOR_AuthenticAMD_ebx 0x68747541 #define X86EMUL_CPUID_VENDOR_AuthenticAMD_ecx 0x444d4163 #define X86EMUL_CPUID_VENDOR_AuthenticAMD_edx 0x69746e65 #define X86EMUL_CPUID_VENDOR_AMDisbetterI_ebx 0x69444d41 #define X86EMUL_CPUID_VENDOR_AMDisbetterI_ecx 0x21726574 #define X86EMUL_CPUID_VENDOR_AMDisbetterI_edx 0x74656273 #define X86EMUL_CPUID_VENDOR_HygonGenuine_ebx 0x6f677948 #define X86EMUL_CPUID_VENDOR_HygonGenuine_ecx 0x656e6975 #define X86EMUL_CPUID_VENDOR_HygonGenuine_edx 0x6e65476e #define X86EMUL_CPUID_VENDOR_GenuineIntel_ebx 0x756e6547 #define X86EMUL_CPUID_VENDOR_GenuineIntel_ecx 0x6c65746e #define X86EMUL_CPUID_VENDOR_GenuineIntel_edx 0x49656e69 enum x86_intercept_stage { X86_ICTP_NONE = 0, / Allow zero-init to not match anything / X86_ICPT_PRE_EXCEPT, X86_ICPT_POST_EXCEPT, X86_ICPT_POST_MEMACCESS, }; enum x86_intercept { x86_intercept_none, x86_intercept_cr_read, x86_intercept_cr_write, x86_intercept_clts, x86_intercept_lmsw, x86_intercept_smsw, x86_intercept_dr_read, x86_intercept_dr_write, x86_intercept_lidt, x86_intercept_sidt, x86_intercept_lgdt, x86_intercept_sgdt, x86_intercept_lldt, x86_intercept_sldt, x86_intercept_ltr, x86_intercept_str, x86_intercept_rdtsc, x86_intercept_rdpmc, x86_intercept_pushf, x86_intercept_popf, x86_intercept_cpuid, x86_intercept_rsm, x86_intercept_iret, x86_intercept_intn, x86_intercept_invd, x86_intercept_pause, x86_intercept_hlt, x86_intercept_invlpg, x86_intercept_invlpga, x86_intercept_vmrun, x86_intercept_vmload, x86_intercept_vmsave, x86_intercept_vmmcall, x86_intercept_stgi, x86_intercept_clgi, x86_intercept_skinit, x86_intercept_rdtscp, x86_intercept_icebp, x86_intercept_wbinvd, x86_intercept_monitor, x86_intercept_mwait, x86_intercept_rdmsr, x86_intercept_wrmsr, x86_intercept_in, x86_intercept_ins, x86_intercept_out, x86_intercept_outs, x86_intercept_xsetbv, nr_x86_intercepts }; / Host execution mode. / #if defined(CONFIG_X86_32) #define X86EMUL_MODE_HOST X86EMUL_MODE_PROT32 #elif defined(CONFIG_X86_64) #define X86EMUL_MODE_HOST X86EMUL_MODE_PROT64 #endif int x86_decode_insn(struct x86_emulate_ctxt ctxt, void insn, int insn_len); bool x86_page_table_writing_insn(struct x86_emulate_ctxt ctxt); #define EMULATION_FAILED -1 #define EMULATION_OK 0 #define EMULATION_RESTART 1 #define EMULATION_INTERCEPTED 2 void init_decode_cache(struct x86_emulate_ctxt ctxt); int x86_emulate_insn(struct x86_emulate_ctxt ctxt); int emulator_task_switch(struct x86_emulate_ctxt ctxt, u16 tss_selector, int idt_index, int reason, bool has_error_code, u32 error_code); int emulate_int_real(struct x86_emulate_ctxt ctxt, int irq); void emulator_invalidate_register_cache(struct x86_emulate_ctxt ctxt); void emulator_writeback_register_cache(struct x86_emulate_ctxt ctxt); bool emulator_can_use_gpa(struct x86_emulate_ctxt ctxt); #endif / _ASM_X86_KVM_X86_EMULATE_H */

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