diff options
Diffstat (limited to 'drivers/kvm/x86_emulate.h')
| -rw-r--r-- | drivers/kvm/x86_emulate.h | 155 |
1 files changed, 0 insertions, 155 deletions
diff --git a/drivers/kvm/x86_emulate.h b/drivers/kvm/x86_emulate.h deleted file mode 100644 index 92c73aa7f9ac..000000000000 --- a/drivers/kvm/x86_emulate.h +++ /dev/null @@ -1,155 +0,0 @@ -/****************************************************************************** - * 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 __X86_EMULATE_H__ -#define __X86_EMULATE_H__ - -struct x86_emulate_ctxt; - -/* - * 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 2 /* retry the instruction for some reason */ -#define X86EMUL_CMPXCHG_FAILED 2 /* cmpxchg did not see expected value */ -struct x86_emulate_ops { - /* - * read_std: Read bytes of standard (non-emulated/special) memory. - * Used for instruction fetch, stack operations, and others. - * @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_std)(unsigned long addr, void *val, - unsigned int bytes, struct kvm_vcpu *vcpu); - - /* - * write_std: Write bytes of standard (non-emulated/special) memory. - * Used for stack operations, and others. - * @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_std)(unsigned long addr, const void *val, - unsigned int bytes, struct kvm_vcpu *vcpu); - - /* - * 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) (unsigned long addr, - void *val, - unsigned int bytes, - struct kvm_vcpu *vcpu); - - /* - * write_emulated: Read bytes from 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) (unsigned long addr, - const void *val, - unsigned int bytes, - struct kvm_vcpu *vcpu); - - /* - * 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) (unsigned long addr, - const void *old, - const void *new, - unsigned int bytes, - struct kvm_vcpu *vcpu); - -}; - -struct x86_emulate_ctxt { - /* Register state before/after emulation. */ - struct kvm_vcpu *vcpu; - - /* Linear faulting address (if emulating a page-faulting instruction). */ - unsigned long eflags; - unsigned long cr2; - - /* Emulated execution mode, represented by an X86EMUL_MODE value. */ - int mode; - - unsigned long cs_base; - unsigned long ds_base; - unsigned long es_base; - unsigned long ss_base; - unsigned long gs_base; - unsigned long fs_base; -}; - -/* Execution mode, passed to the emulator. */ -#define X86EMUL_MODE_REAL 0 /* Real mode. */ -#define X86EMUL_MODE_PROT16 2 /* 16-bit protected mode. */ -#define X86EMUL_MODE_PROT32 4 /* 32-bit protected mode. */ -#define X86EMUL_MODE_PROT64 8 /* 64-bit (long) mode. */ - -/* Host execution mode. */ -#if defined(__i386__) -#define X86EMUL_MODE_HOST X86EMUL_MODE_PROT32 -#elif defined(CONFIG_X86_64) -#define X86EMUL_MODE_HOST X86EMUL_MODE_PROT64 -#endif - -/* - * x86_emulate_memop: Emulate an instruction that faulted attempting to - * read/write a 'special' memory area. - * Returns -1 on failure, 0 on success. - */ -int x86_emulate_memop(struct x86_emulate_ctxt *ctxt, - struct x86_emulate_ops *ops); - -#endif /* __X86_EMULATE_H__ */ |