Hi Wei, I love your patch! Yet something to improve: [auto build test ERROR on tip/x86/core] [also build test ERROR on asm-generic/master iommu/next tip/timers/core pci/next linus/master v5.10-rc2 next-20201105] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Wei-Liu/Introducing-Linux-root-partition-support-for-Microsoft-Hypervisor/20201106-010058 base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 238c91115cd05c71447ea071624a4c9fe661f970 config: x86_64-randconfig-a004-20201104 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 09ec07827b1128504457a93dee80b2ceee1af600) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://github.com/0day-ci/linux/commit/3984ce0be67e74b8945288f1751a91615459f75e git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Wei-Liu/Introducing-Linux-root-partition-support-for-Microsoft-Hypervisor/20201106-010058 git checkout 3984ce0be67e74b8945288f1751a91615459f75e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): >> arch/x86/kernel/cpu/mshyperv.c:247:3: error: use of undeclared identifier 'hv_root_partition' hv_root_partition = true; ^ 1 error generated. vim +/hv_root_partition +247 arch/x86/kernel/cpu/mshyperv.c 218 219 /* 220 * Extract the features and hints 221 */ 222 ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES); 223 ms_hyperv.misc_features = cpuid_edx(HYPERV_CPUID_FEATURES); 224 ms_hyperv.hints = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO); 225 226 pr_info("Hyper-V: features 0x%x, hints 0x%x, misc 0x%x\n", 227 ms_hyperv.features, ms_hyperv.hints, ms_hyperv.misc_features); 228 229 ms_hyperv.max_vp_index = cpuid_eax(HYPERV_CPUID_IMPLEMENT_LIMITS); 230 ms_hyperv.max_lp_index = cpuid_ebx(HYPERV_CPUID_IMPLEMENT_LIMITS); 231 232 pr_debug("Hyper-V: max %u virtual processors, %u logical processors\n", 233 ms_hyperv.max_vp_index, ms_hyperv.max_lp_index); 234 235 /* 236 * Check CPU management privilege. 237 * 238 * To mirror what Windows does we should extract CPU management 239 * features and use the ReservedIdentityBit to detect if Linux is the 240 * root partition. But that requires negotiating CPU management 241 * interface (a process to be finalized). 242 * 243 * For now, use the privilege flag as the indicator for running as 244 * root. 245 */ 246 if (cpuid_ebx(HYPERV_CPUID_FEATURES) & HV_CPU_MANAGEMENT) { > 247 hv_root_partition = true; 248 pr_info("Hyper-V: running as root partition\n"); 249 } 250 251 /* 252 * Extract host information. 253 */ 254 if (cpuid_eax(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS) >= 255 HYPERV_CPUID_VERSION) { 256 hv_host_info_eax = cpuid_eax(HYPERV_CPUID_VERSION); 257 hv_host_info_ebx = cpuid_ebx(HYPERV_CPUID_VERSION); 258 hv_host_info_ecx = cpuid_ecx(HYPERV_CPUID_VERSION); 259 hv_host_info_edx = cpuid_edx(HYPERV_CPUID_VERSION); 260 261 pr_info("Hyper-V Host Build:%d-%d.%d-%d-%d.%d\n", 262 hv_host_info_eax, hv_host_info_ebx >> 16, 263 hv_host_info_ebx & 0xFFFF, hv_host_info_ecx, 264 hv_host_info_edx >> 24, hv_host_info_edx & 0xFFFFFF); 265 } 266 267 if (ms_hyperv.features & HV_X64_ACCESS_FREQUENCY_MSRS && 268 ms_hyperv.misc_features & HV_FEATURE_FREQUENCY_MSRS_AVAILABLE) { 269 x86_platform.calibrate_tsc = hv_get_tsc_khz; 270 x86_platform.calibrate_cpu = hv_get_tsc_khz; 271 } 272 273 if (ms_hyperv.hints & HV_X64_ENLIGHTENED_VMCS_RECOMMENDED) { 274 ms_hyperv.nested_features = 275 cpuid_eax(HYPERV_CPUID_NESTED_FEATURES); 276 } 277 278 /* 279 * Hyper-V expects to get crash register data or kmsg when 280 * crash enlightment is available and system crashes. Set 281 * crash_kexec_post_notifiers to be true to make sure that 282 * calling crash enlightment interface before running kdump 283 * kernel. 284 */ 285 if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) 286 crash_kexec_post_notifiers = true; 287 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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