FreeBSD/Linux Kernel Cross Reference
sys/amd64/include/vmm.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2011 NetApp, Inc.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD: releng/12.0/sys/amd64/include/vmm.h 338957 2018-09-27 11:16:19Z andrew $
     */
    
    #ifndef _VMM_H_
    #define _VMM_H_
    
    #include <sys/sdt.h>
    #include <x86/segments.h>
    
    #ifdef _KERNEL
    SDT_PROVIDER_DECLARE(vmm);
    #endif
    
    enum vm_suspend_how {
            VM_SUSPEND_NONE,
            VM_SUSPEND_RESET,
            VM_SUSPEND_POWEROFF,
            VM_SUSPEND_HALT,
            VM_SUSPEND_TRIPLEFAULT,
            VM_SUSPEND_LAST
    };
    
    /*
     * Identifiers for architecturally defined registers.
     */
    enum vm_reg_name {
            VM_REG_GUEST_RAX,
            VM_REG_GUEST_RBX,
            VM_REG_GUEST_RCX,
            VM_REG_GUEST_RDX,
            VM_REG_GUEST_RSI,
            VM_REG_GUEST_RDI,
            VM_REG_GUEST_RBP,
            VM_REG_GUEST_R8,
            VM_REG_GUEST_R9,
            VM_REG_GUEST_R10,
            VM_REG_GUEST_R11,
            VM_REG_GUEST_R12,
            VM_REG_GUEST_R13,
            VM_REG_GUEST_R14,
            VM_REG_GUEST_R15,
            VM_REG_GUEST_CR0,
            VM_REG_GUEST_CR3,
            VM_REG_GUEST_CR4,
            VM_REG_GUEST_DR7,
            VM_REG_GUEST_RSP,
            VM_REG_GUEST_RIP,
            VM_REG_GUEST_RFLAGS,
            VM_REG_GUEST_ES,
            VM_REG_GUEST_CS,
            VM_REG_GUEST_SS,
            VM_REG_GUEST_DS,
            VM_REG_GUEST_FS,
            VM_REG_GUEST_GS,
            VM_REG_GUEST_LDTR,
            VM_REG_GUEST_TR,
            VM_REG_GUEST_IDTR,
            VM_REG_GUEST_GDTR,
            VM_REG_GUEST_EFER,
            VM_REG_GUEST_CR2,
            VM_REG_GUEST_PDPTE0,
            VM_REG_GUEST_PDPTE1,
            VM_REG_GUEST_PDPTE2,
            VM_REG_GUEST_PDPTE3,
            VM_REG_GUEST_INTR_SHADOW,
            VM_REG_GUEST_DR0,
            VM_REG_GUEST_DR1,
            VM_REG_GUEST_DR2,
            VM_REG_GUEST_DR3,
            VM_REG_GUEST_DR6,
            VM_REG_LAST
    };
   
   enum x2apic_state {
           X2APIC_DISABLED,
           X2APIC_ENABLED,
           X2APIC_STATE_LAST
   };
   
   #define VM_INTINFO_VECTOR(info) ((info) & 0xff)
   #define VM_INTINFO_DEL_ERRCODE  0x800
   #define VM_INTINFO_RSVD         0x7ffff000
   #define VM_INTINFO_VALID        0x80000000
   #define VM_INTINFO_TYPE         0x700
   #define VM_INTINFO_HWINTR       (0 << 8)
   #define VM_INTINFO_NMI          (2 << 8)
   #define VM_INTINFO_HWEXCEPTION  (3 << 8)
   #define VM_INTINFO_SWINTR       (4 << 8)
   
   #ifdef _KERNEL
   
   #define VM_MAX_NAMELEN  32
   
   struct vm;
   struct vm_exception;
   struct seg_desc;
   struct vm_exit;
   struct vm_run;
   struct vhpet;
   struct vioapic;
   struct vlapic;
   struct vmspace;
   struct vm_object;
   struct vm_guest_paging;
   struct pmap;
   
   struct vm_eventinfo {
           void    *rptr;          /* rendezvous cookie */
           int     *sptr;          /* suspend cookie */
           int     *iptr;          /* reqidle cookie */
   };
   
   typedef int     (*vmm_init_func_t)(int ipinum);
   typedef int     (*vmm_cleanup_func_t)(void);
   typedef void    (*vmm_resume_func_t)(void);
   typedef void *  (*vmi_init_func_t)(struct vm *vm, struct pmap *pmap);
   typedef int     (*vmi_run_func_t)(void *vmi, int vcpu, register_t rip,
                       struct pmap *pmap, struct vm_eventinfo *info);
   typedef void    (*vmi_cleanup_func_t)(void *vmi);
   typedef int     (*vmi_get_register_t)(void *vmi, int vcpu, int num,
                                         uint64_t *retval);
   typedef int     (*vmi_set_register_t)(void *vmi, int vcpu, int num,
                                         uint64_t val);
   typedef int     (*vmi_get_desc_t)(void *vmi, int vcpu, int num,
                                     struct seg_desc *desc);
   typedef int     (*vmi_set_desc_t)(void *vmi, int vcpu, int num,
                                     struct seg_desc *desc);
   typedef int     (*vmi_get_cap_t)(void *vmi, int vcpu, int num, int *retval);
   typedef int     (*vmi_set_cap_t)(void *vmi, int vcpu, int num, int val);
   typedef struct vmspace * (*vmi_vmspace_alloc)(vm_offset_t min, vm_offset_t max);
   typedef void    (*vmi_vmspace_free)(struct vmspace *vmspace);
   typedef struct vlapic * (*vmi_vlapic_init)(void *vmi, int vcpu);
   typedef void    (*vmi_vlapic_cleanup)(void *vmi, struct vlapic *vlapic);
   
   struct vmm_ops {
           vmm_init_func_t         init;           /* module wide initialization */
           vmm_cleanup_func_t      cleanup;
           vmm_resume_func_t       resume;
   
           vmi_init_func_t         vminit;         /* vm-specific initialization */
           vmi_run_func_t          vmrun;
           vmi_cleanup_func_t      vmcleanup;
           vmi_get_register_t      vmgetreg;
           vmi_set_register_t      vmsetreg;
           vmi_get_desc_t          vmgetdesc;
           vmi_set_desc_t          vmsetdesc;
           vmi_get_cap_t           vmgetcap;
           vmi_set_cap_t           vmsetcap;
           vmi_vmspace_alloc       vmspace_alloc;
           vmi_vmspace_free        vmspace_free;
           vmi_vlapic_init         vlapic_init;
           vmi_vlapic_cleanup      vlapic_cleanup;
   };
   
   extern struct vmm_ops vmm_ops_intel;
   extern struct vmm_ops vmm_ops_amd;
   
   int vm_create(const char *name, struct vm **retvm);
   void vm_destroy(struct vm *vm);
   int vm_reinit(struct vm *vm);
   const char *vm_name(struct vm *vm);
   void vm_get_topology(struct vm *vm, uint16_t *sockets, uint16_t *cores,
       uint16_t *threads, uint16_t *maxcpus);
   int vm_set_topology(struct vm *vm, uint16_t sockets, uint16_t cores,
       uint16_t threads, uint16_t maxcpus);
   
   /*
    * APIs that modify the guest memory map require all vcpus to be frozen.
    */
   int vm_mmap_memseg(struct vm *vm, vm_paddr_t gpa, int segid, vm_ooffset_t off,
       size_t len, int prot, int flags);
   int vm_alloc_memseg(struct vm *vm, int ident, size_t len, bool sysmem);
   void vm_free_memseg(struct vm *vm, int ident);
   int vm_map_mmio(struct vm *vm, vm_paddr_t gpa, size_t len, vm_paddr_t hpa);
   int vm_unmap_mmio(struct vm *vm, vm_paddr_t gpa, size_t len);
   int vm_assign_pptdev(struct vm *vm, int bus, int slot, int func);
   int vm_unassign_pptdev(struct vm *vm, int bus, int slot, int func);
   
   /*
    * APIs that inspect the guest memory map require only a *single* vcpu to
    * be frozen. This acts like a read lock on the guest memory map since any
    * modification requires *all* vcpus to be frozen.
    */
   int vm_mmap_getnext(struct vm *vm, vm_paddr_t *gpa, int *segid,
       vm_ooffset_t *segoff, size_t *len, int *prot, int *flags);
   int vm_get_memseg(struct vm *vm, int ident, size_t *len, bool *sysmem,
       struct vm_object **objptr);
   vm_paddr_t vmm_sysmem_maxaddr(struct vm *vm);
   void *vm_gpa_hold(struct vm *, int vcpuid, vm_paddr_t gpa, size_t len,
       int prot, void **cookie);
   void vm_gpa_release(void *cookie);
   bool vm_mem_allocated(struct vm *vm, int vcpuid, vm_paddr_t gpa);
   
   int vm_get_register(struct vm *vm, int vcpu, int reg, uint64_t *retval);
   int vm_set_register(struct vm *vm, int vcpu, int reg, uint64_t val);
   int vm_get_seg_desc(struct vm *vm, int vcpu, int reg,
                       struct seg_desc *ret_desc);
   int vm_set_seg_desc(struct vm *vm, int vcpu, int reg,
                       struct seg_desc *desc);
   int vm_run(struct vm *vm, struct vm_run *vmrun);
   int vm_suspend(struct vm *vm, enum vm_suspend_how how);
   int vm_inject_nmi(struct vm *vm, int vcpu);
   int vm_nmi_pending(struct vm *vm, int vcpuid);
   void vm_nmi_clear(struct vm *vm, int vcpuid);
   int vm_inject_extint(struct vm *vm, int vcpu);
   int vm_extint_pending(struct vm *vm, int vcpuid);
   void vm_extint_clear(struct vm *vm, int vcpuid);
   struct vlapic *vm_lapic(struct vm *vm, int cpu);
   struct vioapic *vm_ioapic(struct vm *vm);
   struct vhpet *vm_hpet(struct vm *vm);
   int vm_get_capability(struct vm *vm, int vcpu, int type, int *val);
   int vm_set_capability(struct vm *vm, int vcpu, int type, int val);
   int vm_get_x2apic_state(struct vm *vm, int vcpu, enum x2apic_state *state);
   int vm_set_x2apic_state(struct vm *vm, int vcpu, enum x2apic_state state);
   int vm_apicid2vcpuid(struct vm *vm, int apicid);
   int vm_activate_cpu(struct vm *vm, int vcpu);
   int vm_suspend_cpu(struct vm *vm, int vcpu);
   int vm_resume_cpu(struct vm *vm, int vcpu);
   struct vm_exit *vm_exitinfo(struct vm *vm, int vcpuid);
   void vm_exit_suspended(struct vm *vm, int vcpuid, uint64_t rip);
   void vm_exit_debug(struct vm *vm, int vcpuid, uint64_t rip);
   void vm_exit_rendezvous(struct vm *vm, int vcpuid, uint64_t rip);
   void vm_exit_astpending(struct vm *vm, int vcpuid, uint64_t rip);
   void vm_exit_reqidle(struct vm *vm, int vcpuid, uint64_t rip);
   
   #ifdef _SYS__CPUSET_H_
   /*
    * Rendezvous all vcpus specified in 'dest' and execute 'func(arg)'.
    * The rendezvous 'func(arg)' is not allowed to do anything that will
    * cause the thread to be put to sleep.
    *
    * If the rendezvous is being initiated from a vcpu context then the
    * 'vcpuid' must refer to that vcpu, otherwise it should be set to -1.
    *
    * The caller cannot hold any locks when initiating the rendezvous.
    *
    * The implementation of this API may cause vcpus other than those specified
    * by 'dest' to be stalled. The caller should not rely on any vcpus making
    * forward progress when the rendezvous is in progress.
    */
   typedef void (*vm_rendezvous_func_t)(struct vm *vm, int vcpuid, void *arg);
   void vm_smp_rendezvous(struct vm *vm, int vcpuid, cpuset_t dest,
       vm_rendezvous_func_t func, void *arg);
   cpuset_t vm_active_cpus(struct vm *vm);
   cpuset_t vm_debug_cpus(struct vm *vm);
   cpuset_t vm_suspended_cpus(struct vm *vm);
   #endif  /* _SYS__CPUSET_H_ */
   
   static __inline int
   vcpu_rendezvous_pending(struct vm_eventinfo *info)
   {
   
           return (*((uintptr_t *)(info->rptr)) != 0);
   }
   
   static __inline int
   vcpu_suspended(struct vm_eventinfo *info)
   {
   
           return (*info->sptr);
   }
   
   static __inline int
   vcpu_reqidle(struct vm_eventinfo *info)
   {
   
           return (*info->iptr);
   }
   
   int vcpu_debugged(struct vm *vm, int vcpuid);
   
   /*
    * Return 1 if device indicated by bus/slot/func is supposed to be a
    * pci passthrough device.
    *
    * Return 0 otherwise.
    */
   int vmm_is_pptdev(int bus, int slot, int func);
   
   void *vm_iommu_domain(struct vm *vm);
   
   enum vcpu_state {
           VCPU_IDLE,
           VCPU_FROZEN,
           VCPU_RUNNING,
           VCPU_SLEEPING,
   };
   
   int vcpu_set_state(struct vm *vm, int vcpu, enum vcpu_state state,
       bool from_idle);
   enum vcpu_state vcpu_get_state(struct vm *vm, int vcpu, int *hostcpu);
   
   static int __inline
   vcpu_is_running(struct vm *vm, int vcpu, int *hostcpu)
   {
           return (vcpu_get_state(vm, vcpu, hostcpu) == VCPU_RUNNING);
   }
   
   #ifdef _SYS_PROC_H_
   static int __inline
   vcpu_should_yield(struct vm *vm, int vcpu)
   {
   
           if (curthread->td_flags & (TDF_ASTPENDING | TDF_NEEDRESCHED))
                   return (1);
           else if (curthread->td_owepreempt)
                   return (1);
           else
                   return (0);
   }
   #endif
   
   void *vcpu_stats(struct vm *vm, int vcpu);
   void vcpu_notify_event(struct vm *vm, int vcpuid, bool lapic_intr);
   struct vmspace *vm_get_vmspace(struct vm *vm);
   struct vatpic *vm_atpic(struct vm *vm);
   struct vatpit *vm_atpit(struct vm *vm);
   struct vpmtmr *vm_pmtmr(struct vm *vm);
   struct vrtc *vm_rtc(struct vm *vm);
   
   /*
    * Inject exception 'vector' into the guest vcpu. This function returns 0 on
    * success and non-zero on failure.
    *
    * Wrapper functions like 'vm_inject_gp()' should be preferred to calling
    * this function directly because they enforce the trap-like or fault-like
    * behavior of an exception.
    *
    * This function should only be called in the context of the thread that is
    * executing this vcpu.
    */
   int vm_inject_exception(struct vm *vm, int vcpuid, int vector, int err_valid,
       uint32_t errcode, int restart_instruction);
   
   /*
    * This function is called after a VM-exit that occurred during exception or
    * interrupt delivery through the IDT. The format of 'intinfo' is described
    * in Figure 15-1, "EXITINTINFO for All Intercepts", APM, Vol 2.
    *
    * If a VM-exit handler completes the event delivery successfully then it
    * should call vm_exit_intinfo() to extinguish the pending event. For e.g.,
    * if the task switch emulation is triggered via a task gate then it should
    * call this function with 'intinfo=0' to indicate that the external event
    * is not pending anymore.
    *
    * Return value is 0 on success and non-zero on failure.
    */
   int vm_exit_intinfo(struct vm *vm, int vcpuid, uint64_t intinfo);
   
   /*
    * This function is called before every VM-entry to retrieve a pending
    * event that should be injected into the guest. This function combines
    * nested events into a double or triple fault.
    *
    * Returns 0 if there are no events that need to be injected into the guest
    * and non-zero otherwise.
    */
   int vm_entry_intinfo(struct vm *vm, int vcpuid, uint64_t *info);
   
   int vm_get_intinfo(struct vm *vm, int vcpuid, uint64_t *info1, uint64_t *info2);
   
   enum vm_reg_name vm_segment_name(int seg_encoding);
   
   struct vm_copyinfo {
           uint64_t        gpa;
           size_t          len;
           void            *hva;
           void            *cookie;
   };
   
   /*
    * Set up 'copyinfo[]' to copy to/from guest linear address space starting
    * at 'gla' and 'len' bytes long. The 'prot' should be set to PROT_READ for
    * a copyin or PROT_WRITE for a copyout. 
    *
    * retval       is_fault        Interpretation
    *   0             0            Success
    *   0             1            An exception was injected into the guest
    * EFAULT         N/A           Unrecoverable error
    *
    * The 'copyinfo[]' can be passed to 'vm_copyin()' or 'vm_copyout()' only if
    * the return value is 0. The 'copyinfo[]' resources should be freed by calling
    * 'vm_copy_teardown()' after the copy is done.
    */
   int vm_copy_setup(struct vm *vm, int vcpuid, struct vm_guest_paging *paging,
       uint64_t gla, size_t len, int prot, struct vm_copyinfo *copyinfo,
       int num_copyinfo, int *is_fault);
   void vm_copy_teardown(struct vm *vm, int vcpuid, struct vm_copyinfo *copyinfo,
       int num_copyinfo);
   void vm_copyin(struct vm *vm, int vcpuid, struct vm_copyinfo *copyinfo,
       void *kaddr, size_t len);
   void vm_copyout(struct vm *vm, int vcpuid, const void *kaddr,
       struct vm_copyinfo *copyinfo, size_t len);
   
   int vcpu_trace_exceptions(struct vm *vm, int vcpuid);
   #endif  /* KERNEL */
   
   #define VM_MAXCPU       16                      /* maximum virtual cpus */
   
   /*
    * Identifiers for optional vmm capabilities
    */
   enum vm_cap_type {
           VM_CAP_HALT_EXIT,
           VM_CAP_MTRAP_EXIT,
           VM_CAP_PAUSE_EXIT,
           VM_CAP_UNRESTRICTED_GUEST,
           VM_CAP_ENABLE_INVPCID,
           VM_CAP_MAX
   };
   
   enum vm_intr_trigger {
           EDGE_TRIGGER,
           LEVEL_TRIGGER
   };
           
   /*
    * The 'access' field has the format specified in Table 21-2 of the Intel
    * Architecture Manual vol 3b.
    *
    * XXX The contents of the 'access' field are architecturally defined except
    * bit 16 - Segment Unusable.
    */
   struct seg_desc {
           uint64_t        base;
           uint32_t        limit;
           uint32_t        access;
   };
   #define SEG_DESC_TYPE(access)           ((access) & 0x001f)
   #define SEG_DESC_DPL(access)            (((access) >> 5) & 0x3)
   #define SEG_DESC_PRESENT(access)        (((access) & 0x0080) ? 1 : 0)
   #define SEG_DESC_DEF32(access)          (((access) & 0x4000) ? 1 : 0)
   #define SEG_DESC_GRANULARITY(access)    (((access) & 0x8000) ? 1 : 0)
   #define SEG_DESC_UNUSABLE(access)       (((access) & 0x10000) ? 1 : 0)
   
   enum vm_cpu_mode {
           CPU_MODE_REAL,
           CPU_MODE_PROTECTED,
           CPU_MODE_COMPATIBILITY,         /* IA-32E mode (CS.L = 0) */
           CPU_MODE_64BIT,                 /* IA-32E mode (CS.L = 1) */
   };
   
   enum vm_paging_mode {
           PAGING_MODE_FLAT,
           PAGING_MODE_32,
           PAGING_MODE_PAE,
           PAGING_MODE_64,
   };
   
   struct vm_guest_paging {
           uint64_t        cr3;
           int             cpl;
           enum vm_cpu_mode cpu_mode;
           enum vm_paging_mode paging_mode;
   };
   
   /*
    * The data structures 'vie' and 'vie_op' are meant to be opaque to the
    * consumers of instruction decoding. The only reason why their contents
    * need to be exposed is because they are part of the 'vm_exit' structure.
    */
   struct vie_op {
           uint8_t         op_byte;        /* actual opcode byte */
           uint8_t         op_type;        /* type of operation (e.g. MOV) */
           uint16_t        op_flags;
   };
   
   #define VIE_INST_SIZE   15
   struct vie {
           uint8_t         inst[VIE_INST_SIZE];    /* instruction bytes */
           uint8_t         num_valid;              /* size of the instruction */
           uint8_t         num_processed;
   
           uint8_t         addrsize:4, opsize:4;   /* address and operand sizes */
           uint8_t         rex_w:1,                /* REX prefix */
                           rex_r:1,
                           rex_x:1,
                           rex_b:1,
                           rex_present:1,
                           repz_present:1,         /* REP/REPE/REPZ prefix */
                           repnz_present:1,        /* REPNE/REPNZ prefix */
                           opsize_override:1,      /* Operand size override */
                           addrsize_override:1,    /* Address size override */
                           segment_override:1;     /* Segment override */
   
           uint8_t         mod:2,                  /* ModRM byte */
                           reg:4,
                           rm:4;
   
           uint8_t         ss:2,                   /* SIB byte */
                           index:4,
                           base:4;
   
           uint8_t         disp_bytes;
           uint8_t         imm_bytes;
   
           uint8_t         scale;
           int             base_register;          /* VM_REG_GUEST_xyz */
           int             index_register;         /* VM_REG_GUEST_xyz */
           int             segment_register;       /* VM_REG_GUEST_xyz */
   
           int64_t         displacement;           /* optional addr displacement */
           int64_t         immediate;              /* optional immediate operand */
   
           uint8_t         decoded;        /* set to 1 if successfully decoded */
   
           struct vie_op   op;                     /* opcode description */
   };
   
   enum vm_exitcode {
           VM_EXITCODE_INOUT,
           VM_EXITCODE_VMX,
           VM_EXITCODE_BOGUS,
           VM_EXITCODE_RDMSR,
           VM_EXITCODE_WRMSR,
           VM_EXITCODE_HLT,
           VM_EXITCODE_MTRAP,
           VM_EXITCODE_PAUSE,
           VM_EXITCODE_PAGING,
           VM_EXITCODE_INST_EMUL,
           VM_EXITCODE_SPINUP_AP,
           VM_EXITCODE_DEPRECATED1,        /* used to be SPINDOWN_CPU */
           VM_EXITCODE_RENDEZVOUS,
           VM_EXITCODE_IOAPIC_EOI,
           VM_EXITCODE_SUSPENDED,
           VM_EXITCODE_INOUT_STR,
           VM_EXITCODE_TASK_SWITCH,
           VM_EXITCODE_MONITOR,
           VM_EXITCODE_MWAIT,
           VM_EXITCODE_SVM,
           VM_EXITCODE_REQIDLE,
           VM_EXITCODE_DEBUG,
           VM_EXITCODE_VMINSN,
           VM_EXITCODE_MAX
   };
   
   struct vm_inout {
           uint16_t        bytes:3;        /* 1 or 2 or 4 */
           uint16_t        in:1;
           uint16_t        string:1;
           uint16_t        rep:1;
           uint16_t        port;
           uint32_t        eax;            /* valid for out */
   };
   
   struct vm_inout_str {
           struct vm_inout inout;          /* must be the first element */
           struct vm_guest_paging paging;
           uint64_t        rflags;
           uint64_t        cr0;
           uint64_t        index;
           uint64_t        count;          /* rep=1 (%rcx), rep=0 (1) */
           int             addrsize;
           enum vm_reg_name seg_name;
           struct seg_desc seg_desc;
   };
   
   enum task_switch_reason {
           TSR_CALL,
           TSR_IRET,
           TSR_JMP,
           TSR_IDT_GATE,   /* task gate in IDT */
   };
   
   struct vm_task_switch {
           uint16_t        tsssel;         /* new TSS selector */
           int             ext;            /* task switch due to external event */
           uint32_t        errcode;
           int             errcode_valid;  /* push 'errcode' on the new stack */
           enum task_switch_reason reason;
           struct vm_guest_paging paging;
   };
   
   struct vm_exit {
           enum vm_exitcode        exitcode;
           int                     inst_length;    /* 0 means unknown */
           uint64_t                rip;
           union {
                   struct vm_inout inout;
                   struct vm_inout_str inout_str;
                   struct {
                           uint64_t        gpa;
                           int             fault_type;
                   } paging;
                   struct {
                           uint64_t        gpa;
                           uint64_t        gla;
                           uint64_t        cs_base;
                           int             cs_d;           /* CS.D */
                           struct vm_guest_paging paging;
                           struct vie      vie;
                   } inst_emul;
                   /*
                    * VMX specific payload. Used when there is no "better"
                    * exitcode to represent the VM-exit.
                    */
                   struct {
                           int             status;         /* vmx inst status */
                           /*
                            * 'exit_reason' and 'exit_qualification' are valid
                            * only if 'status' is zero.
                            */
                           uint32_t        exit_reason;
                           uint64_t        exit_qualification;
                           /*
                            * 'inst_error' and 'inst_type' are valid
                            * only if 'status' is non-zero.
                            */
                           int             inst_type;
                           int             inst_error;
                   } vmx;
                   /*
                    * SVM specific payload.
                    */
                   struct {
                           uint64_t        exitcode;
                           uint64_t        exitinfo1;
                           uint64_t        exitinfo2;
                   } svm;
                   struct {
                           uint32_t        code;           /* ecx value */
                           uint64_t        wval;
                   } msr;
                   struct {
                           int             vcpu;
                           uint64_t        rip;
                   } spinup_ap;
                   struct {
                           uint64_t        rflags;
                           uint64_t        intr_status;
                   } hlt;
                   struct {
                           int             vector;
                   } ioapic_eoi;
                   struct {
                           enum vm_suspend_how how;
                   } suspended;
                   struct vm_task_switch task_switch;
           } u;
   };
   
   /* APIs to inject faults into the guest */
   void vm_inject_fault(void *vm, int vcpuid, int vector, int errcode_valid,
       int errcode);
   
   static __inline void
   vm_inject_ud(void *vm, int vcpuid)
   {
           vm_inject_fault(vm, vcpuid, IDT_UD, 0, 0);
   }
   
   static __inline void
   vm_inject_gp(void *vm, int vcpuid)
   {
           vm_inject_fault(vm, vcpuid, IDT_GP, 1, 0);
   }
   
   static __inline void
   vm_inject_ac(void *vm, int vcpuid, int errcode)
   {
           vm_inject_fault(vm, vcpuid, IDT_AC, 1, errcode);
   }
   
   static __inline void
   vm_inject_ss(void *vm, int vcpuid, int errcode)
   {
           vm_inject_fault(vm, vcpuid, IDT_SS, 1, errcode);
   }
   
   void vm_inject_pf(void *vm, int vcpuid, int error_code, uint64_t cr2);
   
   int vm_restart_instruction(void *vm, int vcpuid);
   
   #endif  /* _VMM_H_ */

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