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__ 76typedef 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 121typedef 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 * Note: For compatibility with kernels not setting up exception handlers 148 * early enough, Xen will avoid trying to inject #GP (and hence crash 149 * the domain) when an RDMSR would require this, but no handler was 150 * set yet. The precise conditions are implementation specific, and 151 * new code may not rely on such behavior anyway. 152 */ 153#define TI_GET_DPL(_ti) ((_ti)->flags & 3) 154#define TI_GET_IF(_ti) ((_ti)->flags & 4) 155#define TI_SET_DPL(_ti,_dpl) ((_ti)->flags |= (_dpl)) 156#define TI_SET_IF(_ti,_if) ((_ti)->flags |= ((!!(_if))<<2)) 157struct trap_info { 158 uint8_t vector; /* exception vector */ 159 uint8_t flags; /* 0-3: privilege level; 4: clear event enable? */ 160 uint16_t cs; /* code selector */ 161 unsigned long address; /* code offset */ 162}; 163typedef struct trap_info trap_info_t; 164DEFINE_XEN_GUEST_HANDLE(trap_info_t); 165 166typedef uint64_t tsc_timestamp_t; /* RDTSC timestamp */ 167 168/* 169 * The following is all CPU context. Note that the fpu_ctxt block is filled 170 * in by FXSAVE if the CPU has feature FXSR; otherwise FSAVE is used. 171 * 172 * Also note that when calling DOMCTL_setvcpucontext for HVM guests, not all 173 * information in this structure is updated, the fields read include: fpu_ctxt 174 * (if VGCT_I387_VALID is set), flags, user_regs and debugreg[*]. 175 * 176 * Note: VCPUOP_initialise for HVM guests is non-symetric with 177 * DOMCTL_setvcpucontext, and uses struct vcpu_hvm_context from hvm/hvm_vcpu.h 178 */ 179struct vcpu_guest_context { 180 /* FPU registers come first so they can be aligned for FXSAVE/FXRSTOR. */ 181 struct { char x[512]; } fpu_ctxt; /* User-level FPU registers */ 182#define VGCF_I387_VALID (1<<0) 183#define VGCF_IN_KERNEL (1<<2) 184#define _VGCF_i387_valid 0 185#define VGCF_i387_valid (1<<_VGCF_i387_valid) 186#define _VGCF_in_kernel 2 187#define VGCF_in_kernel (1<<_VGCF_in_kernel) 188#define _VGCF_failsafe_disables_events 3 189#define VGCF_failsafe_disables_events (1<<_VGCF_failsafe_disables_events) 190#define _VGCF_syscall_disables_events 4 191#define VGCF_syscall_disables_events (1<<_VGCF_syscall_disables_events) 192#define _VGCF_online 5 193#define VGCF_online (1<<_VGCF_online) 194 unsigned long flags; /* VGCF_* flags */ 195 struct cpu_user_regs user_regs; /* User-level CPU registers */ 196 struct trap_info trap_ctxt[256]; /* Virtual IDT */ 197 unsigned long ldt_base, ldt_ents; /* LDT (linear address, # ents) */ 198 unsigned long gdt_frames[16], gdt_ents; /* GDT (machine frames, # ents) */ 199 unsigned long kernel_ss, kernel_sp; /* Virtual TSS (only SS1/SP1) */ 200 /* NB. User pagetable on x86/64 is placed in ctrlreg[1]. */ 201 unsigned long ctrlreg[8]; /* CR0-CR7 (control registers) */ 202 unsigned long debugreg[8]; /* DB0-DB7 (debug registers) */ 203#ifdef __i386__ 204 unsigned long event_callback_cs; /* CS:EIP of event callback */ 205 unsigned long event_callback_eip; 206 unsigned long failsafe_callback_cs; /* CS:EIP of failsafe callback */ 207 unsigned long failsafe_callback_eip; 208#else 209 unsigned long event_callback_eip; 210 unsigned long failsafe_callback_eip; 211#ifdef __XEN__ 212 union { 213 unsigned long syscall_callback_eip; 214 struct { 215 unsigned int event_callback_cs; /* compat CS of event cb */ 216 unsigned int failsafe_callback_cs; /* compat CS of failsafe cb */ 217 }; 218 }; 219#else 220 unsigned long syscall_callback_eip; 221#endif 222#endif 223 unsigned long vm_assist; /* VMASST_TYPE_* bitmap */ 224#ifdef __x86_64__ 225 /* Segment base addresses. */ 226 uint64_t fs_base; 227 uint64_t gs_base_kernel; 228 uint64_t gs_base_user; 229#endif 230}; 231typedef struct vcpu_guest_context vcpu_guest_context_t; 232DEFINE_XEN_GUEST_HANDLE(vcpu_guest_context_t); 233 234struct arch_shared_info { 235 /* 236 * Number of valid entries in the p2m table(s) anchored at 237 * pfn_to_mfn_frame_list_list and/or p2m_vaddr. 238 */ 239 unsigned long max_pfn; 240 /* 241 * Frame containing list of mfns containing list of mfns containing p2m. 242 * A value of 0 indicates it has not yet been set up, ~0 indicates it has 243 * been set to invalid e.g. due to the p2m being too large for the 3-level 244 * p2m tree. In this case the linear mapper p2m list anchored at p2m_vaddr 245 * is to be used. 246 */ 247 xen_pfn_t pfn_to_mfn_frame_list_list; 248 unsigned long nmi_reason; 249 /* 250 * Following three fields are valid if p2m_cr3 contains a value different 251 * from 0. 252 * p2m_cr3 is the root of the address space where p2m_vaddr is valid. 253 * p2m_cr3 is in the same format as a cr3 value in the vcpu register state 254 * and holds the folded machine frame number (via xen_pfn_to_cr3) of a 255 * L3 or L4 page table. 256 * p2m_vaddr holds the virtual address of the linear p2m list. All entries 257 * in the range [0...max_pfn[ are accessible via this pointer. 258 * p2m_generation will be incremented by the guest before and after each 259 * change of the mappings of the p2m list. p2m_generation starts at 0 and 260 * a value with the least significant bit set indicates that a mapping 261 * update is in progress. This allows guest external software (e.g. in Dom0) 262 * to verify that read mappings are consistent and whether they have changed 263 * since the last check. 264 * Modifying a p2m element in the linear p2m list is allowed via an atomic 265 * write only. 266 */ 267 unsigned long p2m_cr3; /* cr3 value of the p2m address space */ 268 unsigned long p2m_vaddr; /* virtual address of the p2m list */ 269 unsigned long p2m_generation; /* generation count of p2m mapping */ 270#ifdef __i386__ 271 /* There's no room for this field in the generic structure. */ 272 uint32_t wc_sec_hi; 273#endif 274}; 275typedef struct arch_shared_info arch_shared_info_t; 276 277#if defined(__XEN__) || defined(__XEN_TOOLS__) 278/* 279 * struct xen_arch_domainconfig's ABI is covered by 280 * XEN_DOMCTL_INTERFACE_VERSION. 281 */ 282struct xen_arch_domainconfig { 283#define _XEN_X86_EMU_LAPIC 0 284#define XEN_X86_EMU_LAPIC (1U<<_XEN_X86_EMU_LAPIC) 285#define _XEN_X86_EMU_HPET 1 286#define XEN_X86_EMU_HPET (1U<<_XEN_X86_EMU_HPET) 287#define _XEN_X86_EMU_PM 2 288#define XEN_X86_EMU_PM (1U<<_XEN_X86_EMU_PM) 289#define _XEN_X86_EMU_RTC 3 290#define XEN_X86_EMU_RTC (1U<<_XEN_X86_EMU_RTC) 291#define _XEN_X86_EMU_IOAPIC 4 292#define XEN_X86_EMU_IOAPIC (1U<<_XEN_X86_EMU_IOAPIC) 293#define _XEN_X86_EMU_PIC 5 294#define XEN_X86_EMU_PIC (1U<<_XEN_X86_EMU_PIC) 295#define _XEN_X86_EMU_VGA 6 296#define XEN_X86_EMU_VGA (1U<<_XEN_X86_EMU_VGA) 297#define _XEN_X86_EMU_IOMMU 7 298#define XEN_X86_EMU_IOMMU (1U<<_XEN_X86_EMU_IOMMU) 299#define _XEN_X86_EMU_PIT 8 300#define XEN_X86_EMU_PIT (1U<<_XEN_X86_EMU_PIT) 301#define _XEN_X86_EMU_USE_PIRQ 9 302#define XEN_X86_EMU_USE_PIRQ (1U<<_XEN_X86_EMU_USE_PIRQ) 303#define _XEN_X86_EMU_VPCI 10 304#define XEN_X86_EMU_VPCI (1U<<_XEN_X86_EMU_VPCI) 305 306#define XEN_X86_EMU_ALL (XEN_X86_EMU_LAPIC | XEN_X86_EMU_HPET | \ 307 XEN_X86_EMU_PM | XEN_X86_EMU_RTC | \ 308 XEN_X86_EMU_IOAPIC | XEN_X86_EMU_PIC | \ 309 XEN_X86_EMU_VGA | XEN_X86_EMU_IOMMU | \ 310 XEN_X86_EMU_PIT | XEN_X86_EMU_USE_PIRQ |\ 311 XEN_X86_EMU_VPCI) 312 uint32_t emulation_flags; 313 314/* 315 * Select whether to use a relaxed behavior for accesses to MSRs not explicitly 316 * handled by Xen instead of injecting a #GP to the guest. Note this option 317 * doesn't allow the guest to read or write to the underlying MSR. 318 */ 319#define XEN_X86_MSR_RELAXED (1u << 0) 320 uint32_t misc_flags; 321}; 322 323/* Location of online VCPU bitmap. */ 324#define XEN_ACPI_CPU_MAP 0xaf00 325#define XEN_ACPI_CPU_MAP_LEN ((HVM_MAX_VCPUS + 7) / 8) 326 327/* GPE0 bit set during CPU hotplug */ 328#define XEN_ACPI_GPE0_CPUHP_BIT 2 329#endif 330 331/* 332 * Representations of architectural CPUID and MSR information. Used as the 333 * serialised version of Xen's internal representation. 334 */ 335typedef struct xen_cpuid_leaf { 336#define XEN_CPUID_NO_SUBLEAF 0xffffffffu 337 uint32_t leaf, subleaf; 338 uint32_t a, b, c, d; 339} xen_cpuid_leaf_t; 340DEFINE_XEN_GUEST_HANDLE(xen_cpuid_leaf_t); 341 342typedef struct xen_msr_entry { 343 uint32_t idx; 344 uint32_t flags; /* Reserved MBZ. */ 345 uint64_t val; 346} xen_msr_entry_t; 347DEFINE_XEN_GUEST_HANDLE(xen_msr_entry_t); 348 349#endif /* !__ASSEMBLY__ */ 350 351/* 352 * ` enum neg_errnoval 353 * ` HYPERVISOR_fpu_taskswitch(int set); 354 * ` 355 * Sets (if set!=0) or clears (if set==0) CR0.TS. 356 */ 357 358/* 359 * ` enum neg_errnoval 360 * ` HYPERVISOR_set_debugreg(int regno, unsigned long value); 361 * 362 * ` unsigned long 363 * ` HYPERVISOR_get_debugreg(int regno); 364 * For 0<=reg<=7, returns the debug register value. 365 * For other values of reg, returns ((unsigned long)-EINVAL). 366 * (Unfortunately, this interface is defective.) 367 */ 368 369/* 370 * Prefix forces emulation of some non-trapping instructions. 371 * Currently only CPUID. 372 */ 373#ifdef __ASSEMBLY__ 374#define XEN_EMULATE_PREFIX .byte 0x0f,0x0b,0x78,0x65,0x6e ; 375#define XEN_CPUID XEN_EMULATE_PREFIX cpuid 376#else 377#define XEN_EMULATE_PREFIX ".byte 0x0f,0x0b,0x78,0x65,0x6e ; " 378#define XEN_CPUID XEN_EMULATE_PREFIX "cpuid" 379#endif 380 381/* 382 * Debug console IO port, also called "port E9 hack". Each character written 383 * to this IO port will be printed on the hypervisor console, subject to log 384 * level restrictions. 385 */ 386#define XEN_HVM_DEBUGCONS_IOPORT 0xe9 387 388#endif /* __XEN_PUBLIC_ARCH_X86_XEN_H__ */ 389 390/* 391 * Local variables: 392 * mode: C 393 * c-file-style: "BSD" 394 * c-basic-offset: 4 395 * tab-width: 4 396 * indent-tabs-mode: nil 397 * End: 398 */ 399