1 /****************************************************************************** 2 * arch-x86/mca.h 3 * 4 * Contributed by Advanced Micro Devices, Inc. 5 * Author: Christoph Egger <Christoph.Egger (at) amd.com> 6 * 7 * Guest OS machine check interface to x86 Xen. 8 * 9 * Permission is hereby granted, free of charge, to any person obtaining a copy 10 * of this software and associated documentation files (the "Software"), to 11 * deal in the Software without restriction, including without limitation the 12 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 13 * sell copies of the Software, and to permit persons to whom the Software is 14 * furnished to do so, subject to the following conditions: 15 * 16 * The above copyright notice and this permission notice shall be included in 17 * all copies or substantial portions of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 22 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 24 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 25 * DEALINGS IN THE SOFTWARE. 26 */ 27 28 /* Full MCA functionality has the following Usecases from the guest side: 29 * 30 * Must have's: 31 * 1. Dom0 and DomU register machine check trap callback handlers 32 * (already done via "set_trap_table" hypercall) 33 * 2. Dom0 registers machine check event callback handler 34 * (doable via EVTCHNOP_bind_virq) 35 * 3. Dom0 and DomU fetches machine check data 36 * 4. Dom0 wants Xen to notify a DomU 37 * 5. Dom0 gets DomU ID from physical address 38 * 6. Dom0 wants Xen to kill DomU (already done for "xm destroy") 39 * 40 * Nice to have's: 41 * 7. Dom0 wants Xen to deactivate a physical CPU 42 * This is better done as separate task, physical CPU hotplugging, 43 * and hypercall(s) should be sysctl's 44 * 8. Page migration proposed from Xen NUMA work, where Dom0 can tell Xen to 45 * move a DomU (or Dom0 itself) away from a malicious page 46 * producing correctable errors. 47 * 9. offlining physical page: 48 * Xen free's and never re-uses a certain physical page. 49 * 10. Testfacility: Allow Dom0 to write values into machine check MSR's 50 * and tell Xen to trigger a machine check 51 */ 52 53 #ifndef __XEN_PUBLIC_ARCH_X86_MCA_H__ 54 #define __XEN_PUBLIC_ARCH_X86_MCA_H__ 55 56 /* Hypercall */ 57 #define __HYPERVISOR_mca __HYPERVISOR_arch_0 58 59 /* 60 * The xen-unstable repo has interface version 0x03000001; out interface 61 * is incompatible with that and any future minor revisions, so we 62 * choose a different version number range that is numerically less 63 * than that used in xen-unstable. 64 */ 65 #define XEN_MCA_INTERFACE_VERSION 0x01ecc003 66 67 /* IN: Dom0 calls hypercall to retrieve nonurgent telemetry */ 68 #define XEN_MC_NONURGENT 0x0001 69 /* IN: Dom0/DomU calls hypercall to retrieve urgent telemetry */ 70 #define XEN_MC_URGENT 0x0002 71 /* IN: Dom0 acknowledges previosly-fetched telemetry */ 72 #define XEN_MC_ACK 0x0004 73 74 /* OUT: All is ok */ 75 #define XEN_MC_OK 0x0 76 /* OUT: Domain could not fetch data. */ 77 #define XEN_MC_FETCHFAILED 0x1 78 /* OUT: There was no machine check data to fetch. */ 79 #define XEN_MC_NODATA 0x2 80 /* OUT: Between notification time and this hypercall an other 81 * (most likely) correctable error happened. The fetched data, 82 * does not match the original machine check data. */ 83 #define XEN_MC_NOMATCH 0x4 84 85 /* OUT: DomU did not register MC NMI handler. Try something else. */ 86 #define XEN_MC_CANNOTHANDLE 0x8 87 /* OUT: Notifying DomU failed. Retry later or try something else. */ 88 #define XEN_MC_NOTDELIVERED 0x10 89 /* Note, XEN_MC_CANNOTHANDLE and XEN_MC_NOTDELIVERED are mutually exclusive. */ 90 91 /* Applicable to all mc_vcpuid fields below. */ 92 #define XEN_MC_VCPUID_INVALID 0xffff 93 94 #ifndef __ASSEMBLY__ 95 96 #define VIRQ_MCA VIRQ_ARCH_0 /* G. (DOM0) Machine Check Architecture */ 97 98 /* 99 * Machine Check Architecure: 100 * structs are read-only and used to report all kinds of 101 * correctable and uncorrectable errors detected by the HW. 102 * Dom0 and DomU: register a handler to get notified. 103 * Dom0 only: Correctable errors are reported via VIRQ_MCA 104 * Dom0 and DomU: Uncorrectable errors are reported via nmi handlers 105 */ 106 #define MC_TYPE_GLOBAL 0 107 #define MC_TYPE_BANK 1 108 #define MC_TYPE_EXTENDED 2 109 #define MC_TYPE_RECOVERY 3 110 111 struct mcinfo_common { 112 uint16_t type; /* structure type */ 113 uint16_t size; /* size of this struct in bytes */ 114 }; 115 116 117 #define MC_FLAG_CORRECTABLE (1 << 0) 118 #define MC_FLAG_UNCORRECTABLE (1 << 1) 119 #define MC_FLAG_RECOVERABLE (1 << 2) 120 #define MC_FLAG_POLLED (1 << 3) 121 #define MC_FLAG_RESET (1 << 4) 122 #define MC_FLAG_CMCI (1 << 5) 123 #define MC_FLAG_MCE (1 << 6) 124 /* contains global x86 mc information */ 125 struct mcinfo_global { 126 struct mcinfo_common common; 127 128 /* running domain at the time in error (most likely the impacted one) */ 129 uint16_t mc_domid; 130 uint16_t mc_vcpuid; /* virtual cpu scheduled for mc_domid */ 131 uint32_t mc_socketid; /* physical socket of the physical core */ 132 uint16_t mc_coreid; /* physical impacted core */ 133 uint16_t mc_core_threadid; /* core thread of physical core */ 134 uint32_t mc_apicid; 135 uint32_t mc_flags; 136 uint64_t mc_gstatus; /* global status */ 137 }; 138 139 /* contains bank local x86 mc information */ 140 struct mcinfo_bank { 141 struct mcinfo_common common; 142 143 uint16_t mc_bank; /* bank nr */ 144 uint16_t mc_domid; /* Usecase 5: domain referenced by mc_addr on dom0 145 * and if mc_addr is valid. Never valid on DomU. */ 146 uint64_t mc_status; /* bank status */ 147 uint64_t mc_addr; /* bank address, only valid 148 * if addr bit is set in mc_status */ 149 uint64_t mc_misc; 150 uint64_t mc_ctrl2; 151 uint64_t mc_tsc; 152 }; 153 154 155 struct mcinfo_msr { 156 uint64_t reg; /* MSR */ 157 uint64_t value; /* MSR value */ 158 }; 159 160 /* contains mc information from other 161 * or additional mc MSRs */ 162 struct mcinfo_extended { 163 struct mcinfo_common common; 164 165 /* You can fill up to five registers. 166 * If you need more, then use this structure 167 * multiple times. */ 168 169 uint32_t mc_msrs; /* Number of msr with valid values. */ 170 /* 171 * Currently Intel extended MSR (32/64) include all gp registers 172 * and E(R)FLAGS, E(R)IP, E(R)MISC, up to 11/19 of them might be 173 * useful at present. So expand this array to 16/32 to leave room. 174 */ 175 struct mcinfo_msr mc_msr[sizeof(void *) * 4]; 176 }; 177 178 /* Recovery Action flags. Giving recovery result information to DOM0 */ 179 180 /* Xen takes successful recovery action, the error is recovered */ 181 #define REC_ACTION_RECOVERED (0x1 << 0) 182 /* No action is performed by XEN */ 183 #define REC_ACTION_NONE (0x1 << 1) 184 /* It's possible DOM0 might take action ownership in some case */ 185 #define REC_ACTION_NEED_RESET (0x1 << 2) 186 187 /* Different Recovery Action types, if the action is performed successfully, 188 * REC_ACTION_RECOVERED flag will be returned. 189 */ 190 191 /* Page Offline Action */ 192 #define MC_ACTION_PAGE_OFFLINE (0x1 << 0) 193 /* CPU offline Action */ 194 #define MC_ACTION_CPU_OFFLINE (0x1 << 1) 195 /* L3 cache disable Action */ 196 #define MC_ACTION_CACHE_SHRINK (0x1 << 2) 197 198 /* Below interface used between XEN/DOM0 for passing XEN's recovery action 199 * information to DOM0. 200 * usage Senario: After offlining broken page, XEN might pass its page offline 201 * recovery action result to DOM0. DOM0 will save the information in 202 * non-volatile memory for further proactive actions, such as offlining the 203 * easy broken page earlier when doing next reboot. 204 */ 205 struct page_offline_action 206 { 207 /* Params for passing the offlined page number to DOM0 */ 208 uint64_t mfn; 209 uint64_t status; 210 }; 211 212 struct cpu_offline_action 213 { 214 /* Params for passing the identity of the offlined CPU to DOM0 */ 215 uint32_t mc_socketid; 216 uint16_t mc_coreid; 217 uint16_t mc_core_threadid; 218 }; 219 220 #define MAX_UNION_SIZE 16 221 struct mcinfo_recovery 222 { 223 struct mcinfo_common common; 224 uint16_t mc_bank; /* bank nr */ 225 uint8_t action_flags; 226 uint8_t action_types; 227 union { 228 struct page_offline_action page_retire; 229 struct cpu_offline_action cpu_offline; 230 uint8_t pad[MAX_UNION_SIZE]; 231 } action_info; 232 }; 233 234 235 #define MCINFO_HYPERCALLSIZE 1024 236 #define MCINFO_MAXSIZE 768 237 238 #define MCINFO_FLAGS_UNCOMPLETE 0x1 239 struct mc_info { 240 /* Number of mcinfo_* entries in mi_data */ 241 uint32_t mi_nentries; 242 uint32_t flags; 243 uint64_t mi_data[(MCINFO_MAXSIZE - 1) / 8]; 244 }; 245 typedef struct mc_info mc_info_t; 246 DEFINE_XEN_GUEST_HANDLE(mc_info_t); 247 248 #define __MC_MSR_ARRAYSIZE 8 249 #define __MC_NMSRS 1 250 #define MC_NCAPS 7 /* 7 CPU feature flag words */ 251 #define MC_CAPS_STD_EDX 0 /* cpuid level 0x00000001 (%edx) */ 252 #define MC_CAPS_AMD_EDX 1 /* cpuid level 0x80000001 (%edx) */ 253 #define MC_CAPS_TM 2 /* cpuid level 0x80860001 (TransMeta) */ 254 #define MC_CAPS_LINUX 3 /* Linux-defined */ 255 #define MC_CAPS_STD_ECX 4 /* cpuid level 0x00000001 (%ecx) */ 256 #define MC_CAPS_VIA 5 /* cpuid level 0xc0000001 */ 257 #define MC_CAPS_AMD_ECX 6 /* cpuid level 0x80000001 (%ecx) */ 258 259 struct mcinfo_logical_cpu { 260 uint32_t mc_cpunr; 261 uint32_t mc_chipid; 262 uint16_t mc_coreid; 263 uint16_t mc_threadid; 264 uint32_t mc_apicid; 265 uint32_t mc_clusterid; 266 uint32_t mc_ncores; 267 uint32_t mc_ncores_active; 268 uint32_t mc_nthreads; 269 int32_t mc_cpuid_level; 270 uint32_t mc_family; 271 uint32_t mc_vendor; 272 uint32_t mc_model; 273 uint32_t mc_step; 274 char mc_vendorid[16]; 275 char mc_brandid[64]; 276 uint32_t mc_cpu_caps[MC_NCAPS]; 277 uint32_t mc_cache_size; 278 uint32_t mc_cache_alignment; 279 int32_t mc_nmsrvals; 280 struct mcinfo_msr mc_msrvalues[__MC_MSR_ARRAYSIZE]; 281 }; 282 typedef struct mcinfo_logical_cpu xen_mc_logical_cpu_t; 283 DEFINE_XEN_GUEST_HANDLE(xen_mc_logical_cpu_t); 284 285 286 /* 287 * OS's should use these instead of writing their own lookup function 288 * each with its own bugs and drawbacks. 289 * We use macros instead of static inline functions to allow guests 290 * to include this header in assembly files (*.S). 291 */ 292 /* Prototype: 293 * uint32_t x86_mcinfo_nentries(struct mc_info *mi); 294 */ 295 #define x86_mcinfo_nentries(_mi) \ 296 (_mi)->mi_nentries 297 /* Prototype: 298 * struct mcinfo_common *x86_mcinfo_first(struct mc_info *mi); 299 */ 300 #define x86_mcinfo_first(_mi) \ 301 ((struct mcinfo_common *)(_mi)->mi_data) 302 /* Prototype: 303 * struct mcinfo_common *x86_mcinfo_next(struct mcinfo_common *mic); 304 */ 305 #define x86_mcinfo_next(_mic) \ 306 ((struct mcinfo_common *)((uint8_t *)(_mic) + (_mic)->size)) 307 308 /* Prototype: 309 * void x86_mcinfo_lookup(void *ret, struct mc_info *mi, uint16_t type); 310 */ 311 #define x86_mcinfo_lookup(_ret, _mi, _type) \ 312 do { \ 313 uint32_t found, i; \ 314 struct mcinfo_common *_mic; \ 315 \ 316 found = 0; \ 317 (_ret) = NULL; \ 318 if (_mi == NULL) break; \ 319 _mic = x86_mcinfo_first(_mi); \ 320 for (i = 0; i < x86_mcinfo_nentries(_mi); i++) { \ 321 if (_mic->type == (_type)) { \ 322 found = 1; \ 323 break; \ 324 } \ 325 _mic = x86_mcinfo_next(_mic); \ 326 } \ 327 (_ret) = found ? _mic : NULL; \ 328 } while (0) 329 330 331 /* Usecase 1 332 * Register machine check trap callback handler 333 * (already done via "set_trap_table" hypercall) 334 */ 335 336 /* Usecase 2 337 * Dom0 registers machine check event callback handler 338 * done by EVTCHNOP_bind_virq 339 */ 340 341 /* Usecase 3 342 * Fetch machine check data from hypervisor. 343 * Note, this hypercall is special, because both Dom0 and DomU must use this. 344 */ 345 #define XEN_MC_fetch 1 346 struct xen_mc_fetch { 347 /* IN/OUT variables. */ 348 uint32_t flags; /* IN: XEN_MC_NONURGENT, XEN_MC_URGENT, 349 XEN_MC_ACK if ack'ing an earlier fetch */ 350 /* OUT: XEN_MC_OK, XEN_MC_FETCHFAILED, 351 XEN_MC_NODATA, XEN_MC_NOMATCH */ 352 uint32_t _pad0; 353 uint64_t fetch_id; /* OUT: id for ack, IN: id we are ack'ing */ 354 355 /* OUT variables. */ 356 XEN_GUEST_HANDLE(mc_info_t) data; 357 }; 358 typedef struct xen_mc_fetch xen_mc_fetch_t; 359 DEFINE_XEN_GUEST_HANDLE(xen_mc_fetch_t); 360 361 362 /* Usecase 4 363 * This tells the hypervisor to notify a DomU about the machine check error 364 */ 365 #define XEN_MC_notifydomain 2 366 struct xen_mc_notifydomain { 367 /* IN variables. */ 368 uint16_t mc_domid; /* The unprivileged domain to notify. */ 369 uint16_t mc_vcpuid; /* The vcpu in mc_domid to notify. 370 * Usually echo'd value from the fetch hypercall. */ 371 372 /* IN/OUT variables. */ 373 uint32_t flags; 374 375 /* IN: XEN_MC_CORRECTABLE, XEN_MC_TRAP */ 376 /* OUT: XEN_MC_OK, XEN_MC_CANNOTHANDLE, XEN_MC_NOTDELIVERED, XEN_MC_NOMATCH */ 377 }; 378 typedef struct xen_mc_notifydomain xen_mc_notifydomain_t; 379 DEFINE_XEN_GUEST_HANDLE(xen_mc_notifydomain_t); 380 381 #define XEN_MC_physcpuinfo 3 382 struct xen_mc_physcpuinfo { 383 /* IN/OUT */ 384 uint32_t ncpus; 385 uint32_t _pad0; 386 /* OUT */ 387 XEN_GUEST_HANDLE(xen_mc_logical_cpu_t) info; 388 }; 389 390 #define XEN_MC_msrinject 4 391 #define MC_MSRINJ_MAXMSRS 8 392 struct xen_mc_msrinject { 393 /* IN */ 394 uint32_t mcinj_cpunr; /* target processor id */ 395 uint32_t mcinj_flags; /* see MC_MSRINJ_F_* below */ 396 uint32_t mcinj_count; /* 0 .. count-1 in array are valid */ 397 domid_t mcinj_domid; /* valid only if MC_MSRINJ_F_GPADDR is 398 present in mcinj_flags */ 399 uint16_t _pad0; 400 struct mcinfo_msr mcinj_msr[MC_MSRINJ_MAXMSRS]; 401 }; 402 403 /* Flags for mcinj_flags above; bits 16-31 are reserved */ 404 #define MC_MSRINJ_F_INTERPOSE 0x1 405 #define MC_MSRINJ_F_GPADDR 0x2 406 407 #define XEN_MC_mceinject 5 408 struct xen_mc_mceinject { 409 unsigned int mceinj_cpunr; /* target processor id */ 410 }; 411 412 #if defined(__XEN__) || defined(__XEN_TOOLS__) 413 #define XEN_MC_inject_v2 6 414 #define XEN_MC_INJECT_TYPE_MASK 0x7 415 #define XEN_MC_INJECT_TYPE_MCE 0x0 416 #define XEN_MC_INJECT_TYPE_CMCI 0x1 417 #define XEN_MC_INJECT_TYPE_LMCE 0x2 418 419 #define XEN_MC_INJECT_CPU_BROADCAST 0x8 420 421 struct xen_mc_inject_v2 { 422 uint32_t flags; 423 struct xenctl_bitmap cpumap; 424 }; 425 #endif 426 427 struct xen_mc { 428 uint32_t cmd; 429 uint32_t interface_version; /* XEN_MCA_INTERFACE_VERSION */ 430 union { 431 struct xen_mc_fetch mc_fetch; 432 struct xen_mc_notifydomain mc_notifydomain; 433 struct xen_mc_physcpuinfo mc_physcpuinfo; 434 struct xen_mc_msrinject mc_msrinject; 435 struct xen_mc_mceinject mc_mceinject; 436 #if defined(__XEN__) || defined(__XEN_TOOLS__) 437 struct xen_mc_inject_v2 mc_inject_v2; 438 #endif 439 } u; 440 }; 441 typedef struct xen_mc xen_mc_t; 442 DEFINE_XEN_GUEST_HANDLE(xen_mc_t); 443 444 #endif /* __ASSEMBLY__ */ 445 446 #endif /* __XEN_PUBLIC_ARCH_X86_MCA_H__ */ 447
Indexes created Sat Sep 20 22:09:52 GMT 2025