tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: e3f80d3eae76c3557b3c9b5938ad01c0e6cf25ec commit: d6e2d652443751e290b2edb70173ec3c22f78fbe [11576/12208] x86/hyperv: Add sev-snp enlightened guest static key config: x86_64-randconfig-103-20230823 (https://download.01.org/0day-ci/archive/20230823/202308231805.RyYOycAU-lkp@xxxxxxxxx/config) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce: (https://download.01.org/0day-ci/archive/20230823/202308231805.RyYOycAU-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202308231805.RyYOycAU-lkp@xxxxxxxxx/ All errors (new ones prefixed by >>): ld: vmlinux.o: in function `ms_hyperv_init_platform': >> arch/x86/kernel/cpu/mshyperv.c:407: undefined reference to `isolation_type_en_snp' vim +407 arch/x86/kernel/cpu/mshyperv.c 327 328 /* 329 * Extract the features and hints 330 */ 331 ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES); 332 ms_hyperv.priv_high = cpuid_ebx(HYPERV_CPUID_FEATURES); 333 ms_hyperv.misc_features = cpuid_edx(HYPERV_CPUID_FEATURES); 334 ms_hyperv.hints = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO); 335 336 hv_max_functions_eax = cpuid_eax(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS); 337 338 pr_info("Hyper-V: privilege flags low 0x%x, high 0x%x, hints 0x%x, misc 0x%x\n", 339 ms_hyperv.features, ms_hyperv.priv_high, ms_hyperv.hints, 340 ms_hyperv.misc_features); 341 342 ms_hyperv.max_vp_index = cpuid_eax(HYPERV_CPUID_IMPLEMENT_LIMITS); 343 ms_hyperv.max_lp_index = cpuid_ebx(HYPERV_CPUID_IMPLEMENT_LIMITS); 344 345 pr_debug("Hyper-V: max %u virtual processors, %u logical processors\n", 346 ms_hyperv.max_vp_index, ms_hyperv.max_lp_index); 347 348 /* 349 * Check CPU management privilege. 350 * 351 * To mirror what Windows does we should extract CPU management 352 * features and use the ReservedIdentityBit to detect if Linux is the 353 * root partition. But that requires negotiating CPU management 354 * interface (a process to be finalized). For now, use the privilege 355 * flag as the indicator for running as root. 356 * 357 * Hyper-V should never specify running as root and as a Confidential 358 * VM. But to protect against a compromised/malicious Hyper-V trying 359 * to exploit root behavior to expose Confidential VM memory, ignore 360 * the root partition setting if also a Confidential VM. 361 */ 362 if ((ms_hyperv.priv_high & HV_CPU_MANAGEMENT) && 363 !(ms_hyperv.priv_high & HV_ISOLATION)) { 364 hv_root_partition = true; 365 pr_info("Hyper-V: running as root partition\n"); 366 } 367 368 if (ms_hyperv.hints & HV_X64_HYPERV_NESTED) { 369 hv_nested = true; 370 pr_info("Hyper-V: running on a nested hypervisor\n"); 371 } 372 373 /* 374 * Extract host information. 375 */ 376 if (hv_max_functions_eax >= HYPERV_CPUID_VERSION) { 377 hv_host_info_eax = cpuid_eax(HYPERV_CPUID_VERSION); 378 hv_host_info_ebx = cpuid_ebx(HYPERV_CPUID_VERSION); 379 hv_host_info_ecx = cpuid_ecx(HYPERV_CPUID_VERSION); 380 hv_host_info_edx = cpuid_edx(HYPERV_CPUID_VERSION); 381 382 pr_info("Hyper-V: Host Build %d.%d.%d.%d-%d-%d\n", 383 hv_host_info_ebx >> 16, hv_host_info_ebx & 0xFFFF, 384 hv_host_info_eax, hv_host_info_edx & 0xFFFFFF, 385 hv_host_info_ecx, hv_host_info_edx >> 24); 386 } 387 388 if (ms_hyperv.features & HV_ACCESS_FREQUENCY_MSRS && 389 ms_hyperv.misc_features & HV_FEATURE_FREQUENCY_MSRS_AVAILABLE) { 390 x86_platform.calibrate_tsc = hv_get_tsc_khz; 391 x86_platform.calibrate_cpu = hv_get_tsc_khz; 392 } 393 394 if (ms_hyperv.priv_high & HV_ISOLATION) { 395 ms_hyperv.isolation_config_a = cpuid_eax(HYPERV_CPUID_ISOLATION_CONFIG); 396 ms_hyperv.isolation_config_b = cpuid_ebx(HYPERV_CPUID_ISOLATION_CONFIG); 397 398 if (ms_hyperv.shared_gpa_boundary_active) 399 ms_hyperv.shared_gpa_boundary = 400 BIT_ULL(ms_hyperv.shared_gpa_boundary_bits); 401 402 pr_info("Hyper-V: Isolation Config: Group A 0x%x, Group B 0x%x\n", 403 ms_hyperv.isolation_config_a, ms_hyperv.isolation_config_b); 404 405 406 if (cc_platform_has(CC_ATTR_GUEST_SEV_SNP)) { > 407 static_branch_enable(&isolation_type_en_snp); 408 } else if (hv_get_isolation_type() == HV_ISOLATION_TYPE_SNP) { 409 static_branch_enable(&isolation_type_snp); 410 } 411 } 412 413 if (hv_max_functions_eax >= HYPERV_CPUID_NESTED_FEATURES) { 414 ms_hyperv.nested_features = 415 cpuid_eax(HYPERV_CPUID_NESTED_FEATURES); 416 pr_info("Hyper-V: Nested features: 0x%x\n", 417 ms_hyperv.nested_features); 418 } 419 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
