/* SPDX-License-Identifier: MIT */
/******************************************************************************
* arch-x86/xen.h
*
* Guest OS interface to x86 Xen.
*
* Copyright (c) 2004-2006, K A Fraser
*/
#ifndef __XEN_PUBLIC_ARCH_X86_XEN_H__
#define __XEN_PUBLIC_ARCH_X86_XEN_H__
/* Structural guest handles introduced in 0x00030201. */
#if __XEN_INTERFACE_VERSION__ >= 0x00030201
#define ___DEFINE_XEN_GUEST_HANDLE(name, type) \
typedef struct { type *p; } __guest_handle_ ## name
#else
#define ___DEFINE_XEN_GUEST_HANDLE(name, type) \
typedef type * __guest_handle_ ## name
#endif
/*
* XEN_GUEST_HANDLE represents a guest pointer, when passed as a field
* in a struct in memory.
* XEN_GUEST_HANDLE_PARAM represent a guest pointer, when passed as an
* hypercall argument.
* XEN_GUEST_HANDLE_PARAM and XEN_GUEST_HANDLE are the same on X86 but
* they might not be on other architectures.
*/
#define __DEFINE_XEN_GUEST_HANDLE(name, type) \
___DEFINE_XEN_GUEST_HANDLE(name, type); \
___DEFINE_XEN_GUEST_HANDLE(const_##name, const type)
#define DEFINE_XEN_GUEST_HANDLE(name) __DEFINE_XEN_GUEST_HANDLE(name, name)
#define __XEN_GUEST_HANDLE(name) __guest_handle_ ## name
#define XEN_GUEST_HANDLE(name) __XEN_GUEST_HANDLE(name)
#define XEN_GUEST_HANDLE_PARAM(name) XEN_GUEST_HANDLE(name)
#define set_xen_guest_handle_raw(hnd, val) do { (hnd).p = (val); } while (0)
#define set_xen_guest_handle(hnd, val) set_xen_guest_handle_raw(hnd, val)
#if defined(__i386__)
# ifdef __XEN__
__DeFiNe__ __DECL_REG_LO8(which) uint32_t e ## which ## x
__DeFiNe__ __DECL_REG_LO16(name) union { uint32_t e ## name; }
# endif
#include "xen-x86_32.h"
# ifdef __XEN__
__UnDeF__ __DECL_REG_LO8
__UnDeF__ __DECL_REG_LO16
__DeFiNe__ __DECL_REG_LO8(which) e ## which ## x
__DeFiNe__ __DECL_REG_LO16(name) e ## name
# endif
#elif defined(__x86_64__)
#include "xen-x86_64.h"
#endif
#ifndef __ASSEMBLY__
typedef unsigned long xen_pfn_t;
#define PRI_xen_pfn "lx"
#define PRIu_xen_pfn "lu"
#endif
#define XEN_HAVE_PV_GUEST_ENTRY 1
#define XEN_HAVE_PV_UPCALL_MASK 1
/*
* `incontents 200 segdesc Segment Descriptor Tables
*/
/*
* ` enum neg_errnoval
* ` HYPERVISOR_set_gdt(const xen_pfn_t frames[], unsigned int entries);
* ` [see __HYPERVISOR_set_gdt]
* `
*/
/*
* A number of GDT entries are reserved by Xen. These are not situated at the
* start of the GDT because some stupid OSes export hard-coded selector values
* in their ABI. These hard-coded values are always near the start of the GDT,
* so Xen places itself out of the way, at the far end of the GDT.
*
* NB The LDT is set using the MMUEXT_SET_LDT op of HYPERVISOR_mmuext_op
*/
#define FIRST_RESERVED_GDT_PAGE 14
#define FIRST_RESERVED_GDT_BYTE (FIRST_RESERVED_GDT_PAGE * 4096)
#define FIRST_RESERVED_GDT_ENTRY (FIRST_RESERVED_GDT_BYTE / 8)
/*
* ` enum neg_errnoval
* ` HYPERVISOR_update_descriptor(u64 pa, u64 desc);
* ` [see __HYPERVISOR_update_descriptor]
* `
* ` @pa The machine physical address of the descriptor to
* ` update. Must be either a descriptor page or writable.
* ` @desc The descriptor value to update, in the same format as a
* ` native descriptor table entry.
*/
/* Maximum number of virtual CPUs in legacy multi-processor guests. */
#define XEN_LEGACY_MAX_VCPUS 32
#ifndef __ASSEMBLY__
typedef unsigned long xen_ulong_t;
#define PRI_xen_ulong "lx"
/*
* ` enum neg_errnoval
* ` HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp);
* ` [see __HYPERVISOR_stack_switch]
* `
* Sets the stack segment and pointer for the current vcpu.
*/
/*
* ` enum neg_errnoval
* ` HYPERVISOR_set_trap_table(const struct trap_info traps[]);
* ` [see __HYPERVISOR_set_trap_table]
* `
*/
/*
* Send an array of these to HYPERVISOR_set_trap_table().
* Terminate the array with a sentinel entry, with traps[].address==0.
* The privilege level specifies which modes may enter a trap via a software
* interrupt. On x86/64, since rings 1 and 2 are unavailable, we allocate
* privilege levels as follows:
* Level == 0: Noone may enter
* Level == 1: Kernel may enter
* Level == 2: Kernel may enter
* Level == 3: Everyone may enter
*
* Note: For compatibility with kernels not setting up exception handlers
* early enough, Xen will avoid trying to inject #GP (and hence crash
* the domain) when an RDMSR would require this, but no handler was
* set yet. The precise conditions are implementation specific, and
* new code may not rely on such behavior anyway.
*/
#define TI_GET_DPL(_ti) ((_ti)->flags & 3)
#define TI_GET_IF(_ti) ((_ti)->flags & 4)
#define TI_SET_DPL(_ti,_dpl) ((_ti)->flags |= (_dpl))
#define TI_SET_IF(_ti,_if) ((_ti)->flags |= ((!!(_if))<<2))
struct trap_info {
uint8_t vector; /* exception vector */
uint8_t flags; /* 0-3: privilege level; 4: clear event enable? */
uint16_t cs; /* code selector */
unsigned long address; /* code offset */
};
typedef struct trap_info trap_info_t;
DEFINE_XEN_GUEST_HANDLE(trap_info_t);
typedef uint64_t tsc_timestamp_t; /* RDTSC timestamp */
/*
* The following is all CPU context. Note that the fpu_ctxt block is filled
* in by FXSAVE if the CPU has feature FXSR; otherwise FSAVE is used.
*
* Also note that when calling DOMCTL_setvcpucontext for HVM guests, not all
* information in this structure is updated, the fields read include: fpu_ctxt
* (if VGCT_I387_VALID is set), flags, user_regs and debugreg[*].
*
* Note: VCPUOP_initialise for HVM guests is non-symetric with
* DOMCTL_setvcpucontext, and uses struct vcpu_hvm_context from hvm/hvm_vcpu.h
*/
struct vcpu_guest_context {
/* FPU registers come first so they can be aligned for FXSAVE/FXRSTOR. */
struct { char x[512]; } fpu_ctxt; /* User-level FPU registers */
#define VGCF_I387_VALID (1<<0)
#define VGCF_IN_KERNEL (1<<2)
#define _VGCF_i387_valid 0
#define VGCF_i387_valid (1<<_VGCF_i387_valid)
#define _VGCF_in_kernel 2
#define VGCF_in_kernel (1<<_VGCF_in_kernel)
#define _VGCF_failsafe_disables_events 3
#define VGCF_failsafe_disables_events (1<<_VGCF_failsafe_disables_events)
#define _VGCF_syscall_disables_events 4
#define VGCF_syscall_disables_events (1<<_VGCF_syscall_disables_events)
#define _VGCF_online 5
#define VGCF_online (1<<_VGCF_online)
unsigned long flags; /* VGCF_* flags */
struct cpu_user_regs user_regs; /* User-level CPU registers */
struct trap_info trap_ctxt[256]; /* Virtual IDT */
unsigned long ldt_base, ldt_ents; /* LDT (linear address, # ents) */
unsigned long gdt_frames[16], gdt_ents; /* GDT (machine frames, # ents) */
unsigned long kernel_ss, kernel_sp; /* Virtual TSS (only SS1/SP1) */
/* NB. User pagetable on x86/64 is placed in ctrlreg[1]. */
unsigned long ctrlreg[8]; /* CR0-CR7 (control registers) */
unsigned long debugreg[8]; /* DB0-DB7 (debug registers) */
#ifdef __i386__
unsigned long event_callback_cs; /* CS:EIP of event callback */
unsigned long event_callback_eip;
unsigned long failsafe_callback_cs; /* CS:EIP of failsafe callback */
unsigned long failsafe_callback_eip;
#else
unsigned long event_callback_eip;
unsigned long failsafe_callback_eip;
#ifdef __XEN__
union {
unsigned long syscall_callback_eip;
struct {
unsigned int event_callback_cs; /* compat CS of event cb */
unsigned int failsafe_callback_cs; /* compat CS of failsafe cb */
};
};
#else
unsigned long syscall_callback_eip;
#endif
#endif
unsigned long vm_assist; /* VMASST_TYPE_* bitmap */
#ifdef __x86_64__
/* Segment base addresses. */
uint64_t fs_base;
uint64_t gs_base_kernel;
uint64_t gs_base_user;
#endif
};
typedef struct vcpu_guest_context vcpu_guest_context_t;
DEFINE_XEN_GUEST_HANDLE(vcpu_guest_context_t);
struct arch_shared_info {
/*
* Number of valid entries in the p2m table(s) anchored at
* pfn_to_mfn_frame_list_list and/or p2m_vaddr.
*/
unsigned long max_pfn;
/*
* Frame containing list of mfns containing list of mfns containing p2m.
* A value of 0 indicates it has not yet been set up, ~0 indicates it has
* been set to invalid e.g. due to the p2m being too large for the 3-level
* p2m tree. In this case the linear mapper p2m list anchored at p2m_vaddr
* is to be used.
*/
xen_pfn_t pfn_to_mfn_frame_list_list;
unsigned long nmi_reason;
/*
* Following three fields are valid if p2m_cr3 contains a value different
* from 0.
* p2m_cr3 is the root of the address space where p2m_vaddr is valid.
* p2m_cr3 is in the same format as a cr3 value in the vcpu register state
* and holds the folded machine frame number (via xen_pfn_to_cr3) of a
* L3 or L4 page table.
* p2m_vaddr holds the virtual address of the linear p2m list. All entries
* in the range [0...max_pfn[ are accessible via this pointer.
* p2m_generation will be incremented by the guest before and after each
* change of the mappings of the p2m list. p2m_generation starts at 0 and
* a value with the least significant bit set indicates that a mapping
* update is in progress. This allows guest external software (e.g. in Dom0)
* to verify that read mappings are consistent and whether they have changed
* since the last check.
* Modifying a p2m element in the linear p2m list is allowed via an atomic
* write only.
*/
unsigned long p2m_cr3; /* cr3 value of the p2m address space */
unsigned long p2m_vaddr; /* virtual address of the p2m list */
unsigned long p2m_generation; /* generation count of p2m mapping */
#ifdef __i386__
/* There's no room for this field in the generic structure. */
uint32_t wc_sec_hi;
#endif
};
typedef struct arch_shared_info arch_shared_info_t;
#if defined(__XEN__) || defined(__XEN_TOOLS__)
/*
* struct xen_arch_domainconfig's ABI is covered by
* XEN_DOMCTL_INTERFACE_VERSION.
*/
struct xen_arch_domainconfig {
#define _XEN_X86_EMU_LAPIC 0
#define XEN_X86_EMU_LAPIC (1U<<_XEN_X86_EMU_LAPIC)
#define _XEN_X86_EMU_HPET 1
#define XEN_X86_EMU_HPET (1U<<_XEN_X86_EMU_HPET)
#define _XEN_X86_EMU_PM 2
#define XEN_X86_EMU_PM (1U<<_XEN_X86_EMU_PM)
#define _XEN_X86_EMU_RTC 3
#define XEN_X86_EMU_RTC (1U<<_XEN_X86_EMU_RTC)
#define _XEN_X86_EMU_IOAPIC 4
#define XEN_X86_EMU_IOAPIC (1U<<_XEN_X86_EMU_IOAPIC)
#define _XEN_X86_EMU_PIC 5
#define XEN_X86_EMU_PIC (1U<<_XEN_X86_EMU_PIC)
#define _XEN_X86_EMU_VGA 6
#define XEN_X86_EMU_VGA (1U<<_XEN_X86_EMU_VGA)
#define _XEN_X86_EMU_IOMMU 7
#define XEN_X86_EMU_IOMMU (1U<<_XEN_X86_EMU_IOMMU)
#define _XEN_X86_EMU_PIT 8
#define XEN_X86_EMU_PIT (1U<<_XEN_X86_EMU_PIT)
#define _XEN_X86_EMU_USE_PIRQ 9
#define XEN_X86_EMU_USE_PIRQ (1U<<_XEN_X86_EMU_USE_PIRQ)
#define _XEN_X86_EMU_VPCI 10
#define XEN_X86_EMU_VPCI (1U<<_XEN_X86_EMU_VPCI)
#define XEN_X86_EMU_ALL (XEN_X86_EMU_LAPIC | XEN_X86_EMU_HPET | \
XEN_X86_EMU_PM | XEN_X86_EMU_RTC | \
XEN_X86_EMU_IOAPIC | XEN_X86_EMU_PIC | \
XEN_X86_EMU_VGA | XEN_X86_EMU_IOMMU | \
XEN_X86_EMU_PIT | XEN_X86_EMU_USE_PIRQ |\
XEN_X86_EMU_VPCI)
uint32_t emulation_flags;
/*
* Select whether to use a relaxed behavior for accesses to MSRs not explicitly
* handled by Xen instead of injecting a #GP to the guest. Note this option
* doesn't allow the guest to read or write to the underlying MSR.
*/
#define XEN_X86_MSR_RELAXED (1u << 0)
uint32_t misc_flags;
};
/* Max XEN_X86_* constant. Used for ABI checking. */
#define XEN_X86_MISC_FLAGS_MAX XEN_X86_MSR_RELAXED
#endif
/*
* Representations of architectural CPUID and MSR information. Used as the
* serialised version of Xen's internal representation.
*/
typedef struct xen_cpuid_leaf {
#define XEN_CPUID_NO_SUBLEAF 0xffffffffu
uint32_t leaf, subleaf;
uint32_t a, b, c, d;
} xen_cpuid_leaf_t;
DEFINE_XEN_GUEST_HANDLE(xen_cpuid_leaf_t);
typedef struct xen_msr_entry {
uint32_t idx;
uint32_t flags; /* Reserved MBZ. */
uint64_t val;
} xen_msr_entry_t;
DEFINE_XEN_GUEST_HANDLE(xen_msr_entry_t);
#endif /* !__ASSEMBLY__ */
/*
* ` enum neg_errnoval
* ` HYPERVISOR_fpu_taskswitch(int set);
* ` [see __HYPERVISOR_fpu_taskswitch]
* `
* Sets (if set!=0) or clears (if set==0) CR0.TS.
*/
/*
* ` enum neg_errnoval
* ` HYPERVISOR_set_debugreg(int regno, unsigned long value);
*
* ` unsigned long
* ` HYPERVISOR_get_debugreg(int regno);
* For 0<=reg<=7, returns the debug register value.
* For other values of reg, returns ((unsigned long)-EINVAL).
* (Unfortunately, this interface is defective.)
*/
/* [see __HYPERVISOR_set_debugreg] */
/* [see __HYPERVISOR_get_debugreg] */
/*
* Prefix forces emulation of some non-trapping instructions.
* Currently only CPUID.
*/
#ifdef __ASSEMBLY__
#define XEN_EMULATE_PREFIX .byte 0x0f,0x0b,0x78,0x65,0x6e ;
#define XEN_CPUID XEN_EMULATE_PREFIX cpuid
#else
#define XEN_EMULATE_PREFIX ".byte 0x0f,0x0b,0x78,0x65,0x6e ; "
#define XEN_CPUID XEN_EMULATE_PREFIX "cpuid"
#endif
/*
* Debug console IO port, also called "port E9 hack". Each character written
* to this IO port will be printed on the hypervisor console, subject to log
* level restrictions.
*/
#define XEN_HVM_DEBUGCONS_IOPORT 0xe9
#endif /* __XEN_PUBLIC_ARCH_X86_XEN_H__ */
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/