1 /****************************************************************************** 2 * arch-x86/xen.h 3 * 4 * Guest OS interface to x86 Xen. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to 8 * deal in the Software without restriction, including without limitation the 9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 10 * sell copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 22 * DEALINGS IN THE SOFTWARE. 23 * 24 * Copyright (c) 2004-2006, K A Fraser 25 */ 26 27 #include "../xen.h" 28 29 #ifndef __XEN_PUBLIC_ARCH_X86_XEN_H__ 30 #define __XEN_PUBLIC_ARCH_X86_XEN_H__ 31 32 /* Structural guest handles introduced in 0x00030201. */ 33 #if __XEN_INTERFACE_VERSION__ >= 0x00030201 34 #define ___DEFINE_XEN_GUEST_HANDLE(name, type) \ 35 typedef struct { type *p; } __guest_handle_ ## name 36 #else 37 #define ___DEFINE_XEN_GUEST_HANDLE(name, type) \ 38 typedef type * __guest_handle_ ## name 39 #endif 40 41 /* 42 * XEN_GUEST_HANDLE represents a guest pointer, when passed as a field 43 * in a struct in memory. 44 * XEN_GUEST_HANDLE_PARAM represent a guest pointer, when passed as an 45 * hypercall argument. 46 * XEN_GUEST_HANDLE_PARAM and XEN_GUEST_HANDLE are the same on X86 but 47 * they might not be on other architectures. 48 */ 49 #define __DEFINE_XEN_GUEST_HANDLE(name, type) \ 50 ___DEFINE_XEN_GUEST_HANDLE(name, type); \ 51 ___DEFINE_XEN_GUEST_HANDLE(const_##name, const type) 52 #define DEFINE_XEN_GUEST_HANDLE(name) __DEFINE_XEN_GUEST_HANDLE(name, name) 53 #define __XEN_GUEST_HANDLE(name) __guest_handle_ ## name 54 #define XEN_GUEST_HANDLE(name) __XEN_GUEST_HANDLE(name) 55 #define XEN_GUEST_HANDLE_PARAM(name) XEN_GUEST_HANDLE(name) 56 #define set_xen_guest_handle_raw(hnd, val) do { (hnd).p = val; } while (0) 57 #define set_xen_guest_handle(hnd, val) set_xen_guest_handle_raw(hnd, val) 58 59 #if defined(__i386__) 60 # ifdef __XEN__ 61 __DeFiNe__ __DECL_REG_LO8(which) uint32_t e ## which ## x 62 __DeFiNe__ __DECL_REG_LO16(name) union { uint32_t e ## name; } 63 # endif 64 #include "xen-x86_32.h" 65 # ifdef __XEN__ 66 __UnDeF__ __DECL_REG_LO8 67 __UnDeF__ __DECL_REG_LO16 68 __DeFiNe__ __DECL_REG_LO8(which) e ## which ## x 69 __DeFiNe__ __DECL_REG_LO16(name) e ## name 70 # endif 71 #elif defined(__x86_64__) 72 #include "xen-x86_64.h" 73 #endif 74 75 #ifndef __ASSEMBLY__ 76 typedef unsigned long xen_pfn_t; 77 #define PRI_xen_pfn "lx" 78 #define PRIu_xen_pfn "lu" 79 #endif 80 81 #define XEN_HAVE_PV_GUEST_ENTRY 1 82 83 #define XEN_HAVE_PV_UPCALL_MASK 1 84 85 /* 86 * `incontents 200 segdesc Segment Descriptor Tables 87 */ 88 /* 89 * ` enum neg_errnoval 90 * ` HYPERVISOR_set_gdt(const xen_pfn_t frames[], unsigned int entries); 91 * ` 92 */ 93 /* 94 * A number of GDT entries are reserved by Xen. These are not situated at the 95 * start of the GDT because some stupid OSes export hard-coded selector values 96 * in their ABI. These hard-coded values are always near the start of the GDT, 97 * so Xen places itself out of the way, at the far end of the GDT. 98 * 99 * NB The LDT is set using the MMUEXT_SET_LDT op of HYPERVISOR_mmuext_op 100 */ 101 #define FIRST_RESERVED_GDT_PAGE 14 102 #define FIRST_RESERVED_GDT_BYTE (FIRST_RESERVED_GDT_PAGE * 4096) 103 #define FIRST_RESERVED_GDT_ENTRY (FIRST_RESERVED_GDT_BYTE / 8) 104 105 106 /* 107 * ` enum neg_errnoval 108 * ` HYPERVISOR_update_descriptor(u64 pa, u64 desc); 109 * ` 110 * ` @pa The machine physical address of the descriptor to 111 * ` update. Must be either a descriptor page or writable. 112 * ` @desc The descriptor value to update, in the same format as a 113 * ` native descriptor table entry. 114 */ 115 116 /* Maximum number of virtual CPUs in legacy multi-processor guests. */ 117 #define XEN_LEGACY_MAX_VCPUS 32 118 119 #ifndef __ASSEMBLY__ 120 121 typedef unsigned long xen_ulong_t; 122 #define PRI_xen_ulong "lx" 123 124 /* 125 * ` enum neg_errnoval 126 * ` HYPERVISOR_stack_switch(unsigned long ss, unsigned long esp); 127 * ` 128 * Sets the stack segment and pointer for the current vcpu. 129 */ 130 131 /* 132 * ` enum neg_errnoval 133 * ` HYPERVISOR_set_trap_table(const struct trap_info traps[]); 134 * ` 135 */ 136 /* 137 * Send an array of these to HYPERVISOR_set_trap_table(). 138 * Terminate the array with a sentinel entry, with traps[].address==0. 139 * The privilege level specifies which modes may enter a trap via a software 140 * interrupt. On x86/64, since rings 1 and 2 are unavailable, we allocate 141 * privilege levels as follows: 142 * Level == 0: Noone may enter 143 * Level == 1: Kernel may enter 144 * Level == 2: Kernel may enter 145 * Level == 3: Everyone may enter 146 */ 147 #define TI_GET_DPL(_ti) ((_ti)->flags & 3) 148 #define TI_GET_IF(_ti) ((_ti)->flags & 4) 149 #define TI_SET_DPL(_ti,_dpl) ((_ti)->flags |= (_dpl)) 150 #define TI_SET_IF(_ti,_if) ((_ti)->flags |= ((!!(_if))<<2)) 151 struct trap_info { 152 uint8_t vector; /* exception vector */ 153 uint8_t flags; /* 0-3: privilege level; 4: clear event enable? */ 154 uint16_t cs; /* code selector */ 155 unsigned long address; /* code offset */ 156 }; 157 typedef struct trap_info trap_info_t; 158 DEFINE_XEN_GUEST_HANDLE(trap_info_t); 159 160 typedef uint64_t tsc_timestamp_t; /* RDTSC timestamp */ 161 162 /* 163 * The following is all CPU context. Note that the fpu_ctxt block is filled 164 * in by FXSAVE if the CPU has feature FXSR; otherwise FSAVE is used. 165 * 166 * Also note that when calling DOMCTL_setvcpucontext for HVM guests, not all 167 * information in this structure is updated, the fields read include: fpu_ctxt 168 * (if VGCT_I387_VALID is set), flags, user_regs and debugreg[*]. 169 * 170 * Note: VCPUOP_initialise for HVM guests is non-symetric with 171 * DOMCTL_setvcpucontext, and uses struct vcpu_hvm_context from hvm/hvm_vcpu.h 172 */ 173 struct vcpu_guest_context { 174 /* FPU registers come first so they can be aligned for FXSAVE/FXRSTOR. */ 175 struct { char x[512]; } fpu_ctxt; /* User-level FPU registers */ 176 #define VGCF_I387_VALID (1<<0) 177 #define VGCF_IN_KERNEL (1<<2) 178 #define _VGCF_i387_valid 0 179 #define VGCF_i387_valid (1<<_VGCF_i387_valid) 180 #define _VGCF_in_kernel 2 181 #define VGCF_in_kernel (1<<_VGCF_in_kernel) 182 #define _VGCF_failsafe_disables_events 3 183 #define VGCF_failsafe_disables_events (1<<_VGCF_failsafe_disables_events) 184 #define _VGCF_syscall_disables_events 4 185 #define VGCF_syscall_disables_events (1<<_VGCF_syscall_disables_events) 186 #define _VGCF_online 5 187 #define VGCF_online (1<<_VGCF_online) 188 unsigned long flags; /* VGCF_* flags */ 189 struct cpu_user_regs user_regs; /* User-level CPU registers */ 190 struct trap_info trap_ctxt[256]; /* Virtual IDT */ 191 unsigned long ldt_base, ldt_ents; /* LDT (linear address, # ents) */ 192 unsigned long gdt_frames[16], gdt_ents; /* GDT (machine frames, # ents) */ 193 unsigned long kernel_ss, kernel_sp; /* Virtual TSS (only SS1/SP1) */ 194 /* NB. User pagetable on x86/64 is placed in ctrlreg[1]. */ 195 unsigned long ctrlreg[8]; /* CR0-CR7 (control registers) */ 196 unsigned long debugreg[8]; /* DB0-DB7 (debug registers) */ 197 #ifdef __i386__ 198 unsigned long event_callback_cs; /* CS:EIP of event callback */ 199 unsigned long event_callback_eip; 200 unsigned long failsafe_callback_cs; /* CS:EIP of failsafe callback */ 201 unsigned long failsafe_callback_eip; 202 #else 203 unsigned long event_callback_eip; 204 unsigned long failsafe_callback_eip; 205 #ifdef __XEN__ 206 union { 207 unsigned long syscall_callback_eip; 208 struct { 209 unsigned int event_callback_cs; /* compat CS of event cb */ 210 unsigned int failsafe_callback_cs; /* compat CS of failsafe cb */ 211 }; 212 }; 213 #else 214 unsigned long syscall_callback_eip; 215 #endif 216 #endif 217 unsigned long vm_assist; /* VMASST_TYPE_* bitmap */ 218 #ifdef __x86_64__ 219 /* Segment base addresses. */ 220 uint64_t fs_base; 221 uint64_t gs_base_kernel; 222 uint64_t gs_base_user; 223 #endif 224 }; 225 typedef struct vcpu_guest_context vcpu_guest_context_t; 226 DEFINE_XEN_GUEST_HANDLE(vcpu_guest_context_t); 227 228 struct arch_shared_info { 229 /* 230 * Number of valid entries in the p2m table(s) anchored at 231 * pfn_to_mfn_frame_list_list and/or p2m_vaddr. 232 */ 233 unsigned long max_pfn; 234 /* 235 * Frame containing list of mfns containing list of mfns containing p2m. 236 * A value of 0 indicates it has not yet been set up, ~0 indicates it has 237 * been set to invalid e.g. due to the p2m being too large for the 3-level 238 * p2m tree. In this case the linear mapper p2m list anchored at p2m_vaddr 239 * is to be used. 240 */ 241 xen_pfn_t pfn_to_mfn_frame_list_list; 242 unsigned long nmi_reason; 243 /* 244 * Following three fields are valid if p2m_cr3 contains a value different 245 * from 0. 246 * p2m_cr3 is the root of the address space where p2m_vaddr is valid. 247 * p2m_cr3 is in the same format as a cr3 value in the vcpu register state 248 * and holds the folded machine frame number (via xen_pfn_to_cr3) of a 249 * L3 or L4 page table. 250 * p2m_vaddr holds the virtual address of the linear p2m list. All entries 251 * in the range [0...max_pfn[ are accessible via this pointer. 252 * p2m_generation will be incremented by the guest before and after each 253 * change of the mappings of the p2m list. p2m_generation starts at 0 and 254 * a value with the least significant bit set indicates that a mapping 255 * update is in progress. This allows guest external software (e.g. in Dom0) 256 * to verify that read mappings are consistent and whether they have changed 257 * since the last check. 258 * Modifying a p2m element in the linear p2m list is allowed via an atomic 259 * write only. 260 */ 261 unsigned long p2m_cr3; /* cr3 value of the p2m address space */ 262 unsigned long p2m_vaddr; /* virtual address of the p2m list */ 263 unsigned long p2m_generation; /* generation count of p2m mapping */ 264 #ifdef __i386__ 265 /* There's no room for this field in the generic structure. */ 266 uint32_t wc_sec_hi; 267 #endif 268 }; 269 typedef struct arch_shared_info arch_shared_info_t; 270 271 #if defined(__XEN__) || defined(__XEN_TOOLS__) 272 /* 273 * struct xen_arch_domainconfig's ABI is covered by 274 * XEN_DOMCTL_INTERFACE_VERSION. 275 */ 276 struct xen_arch_domainconfig { 277 #define _XEN_X86_EMU_LAPIC 0 278 #define XEN_X86_EMU_LAPIC (1U<<_XEN_X86_EMU_LAPIC) 279 #define _XEN_X86_EMU_HPET 1 280 #define XEN_X86_EMU_HPET (1U<<_XEN_X86_EMU_HPET) 281 #define _XEN_X86_EMU_PM 2 282 #define XEN_X86_EMU_PM (1U<<_XEN_X86_EMU_PM) 283 #define _XEN_X86_EMU_RTC 3 284 #define XEN_X86_EMU_RTC (1U<<_XEN_X86_EMU_RTC) 285 #define _XEN_X86_EMU_IOAPIC 4 286 #define XEN_X86_EMU_IOAPIC (1U<<_XEN_X86_EMU_IOAPIC) 287 #define _XEN_X86_EMU_PIC 5 288 #define XEN_X86_EMU_PIC (1U<<_XEN_X86_EMU_PIC) 289 #define _XEN_X86_EMU_VGA 6 290 #define XEN_X86_EMU_VGA (1U<<_XEN_X86_EMU_VGA) 291 #define _XEN_X86_EMU_IOMMU 7 292 #define XEN_X86_EMU_IOMMU (1U<<_XEN_X86_EMU_IOMMU) 293 #define _XEN_X86_EMU_PIT 8 294 #define XEN_X86_EMU_PIT (1U<<_XEN_X86_EMU_PIT) 295 #define _XEN_X86_EMU_USE_PIRQ 9 296 #define XEN_X86_EMU_USE_PIRQ (1U<<_XEN_X86_EMU_USE_PIRQ) 297 #define _XEN_X86_EMU_VPCI 10 298 #define XEN_X86_EMU_VPCI (1U<<_XEN_X86_EMU_VPCI) 299 300 #define XEN_X86_EMU_ALL (XEN_X86_EMU_LAPIC | XEN_X86_EMU_HPET | \ 301 XEN_X86_EMU_PM | XEN_X86_EMU_RTC | \ 302 XEN_X86_EMU_IOAPIC | XEN_X86_EMU_PIC | \ 303 XEN_X86_EMU_VGA | XEN_X86_EMU_IOMMU | \ 304 XEN_X86_EMU_PIT | XEN_X86_EMU_USE_PIRQ |\ 305 XEN_X86_EMU_VPCI) 306 uint32_t emulation_flags; 307 }; 308 309 /* Location of online VCPU bitmap. */ 310 #define XEN_ACPI_CPU_MAP 0xaf00 311 #define XEN_ACPI_CPU_MAP_LEN ((HVM_MAX_VCPUS + 7) / 8) 312 313 /* GPE0 bit set during CPU hotplug */ 314 #define XEN_ACPI_GPE0_CPUHP_BIT 2 315 #endif 316 317 #endif /* !__ASSEMBLY__ */ 318 319 /* 320 * ` enum neg_errnoval 321 * ` HYPERVISOR_fpu_taskswitch(int set); 322 * ` 323 * Sets (if set!=0) or clears (if set==0) CR0.TS. 324 */ 325 326 /* 327 * ` enum neg_errnoval 328 * ` HYPERVISOR_set_debugreg(int regno, unsigned long value); 329 * 330 * ` unsigned long 331 * ` HYPERVISOR_get_debugreg(int regno); 332 * For 0<=reg<=7, returns the debug register value. 333 * For other values of reg, returns ((unsigned long)-EINVAL). 334 * (Unfortunately, this interface is defective.) 335 */ 336 337 /* 338 * Prefix forces emulation of some non-trapping instructions. 339 * Currently only CPUID. 340 */ 341 #ifdef __ASSEMBLY__ 342 #define XEN_EMULATE_PREFIX .byte 0x0f,0x0b,0x78,0x65,0x6e ; 343 #define XEN_CPUID XEN_EMULATE_PREFIX cpuid 344 #else 345 #define XEN_EMULATE_PREFIX ".byte 0x0f,0x0b,0x78,0x65,0x6e ; " 346 #define XEN_CPUID XEN_EMULATE_PREFIX "cpuid" 347 #endif 348 349 #endif /* __XEN_PUBLIC_ARCH_X86_XEN_H__ */ 350 351 /* 352 * Local variables: 353 * mode: C 354 * c-file-style: "BSD" 355 * c-basic-offset: 4 356 * tab-width: 4 357 * indent-tabs-mode: nil 358 * End: 359 */ 360
Indexes created Sun Sep 21 14:09:52 GMT 2025