tree: https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git cet/kvm head: e2f9808bd7530f44cd5d95332036bb660b66b8db commit: 6189c6f50e022a416cbd8620b5c17b0a88b6a0c7 [38/49] KVM: x86: Report XSS as an MSR to be saved if there are supported features config: x86_64-randconfig-a014 (https://download.01.org/0day-ci/archive/20220217/202202171337.rVd4JM09-lk...) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0bad7cb56526f2572c74449fcf97c1fcda42b41d) 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 # https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git/commit/?id... git remote add rppt https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git git fetch --no-tags rppt cet/kvm git checkout 6189c6f50e022a416cbd8620b5c17b0a88b6a0c7 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/kvm/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): case MSR_IA32_XSS: ^ arch/x86/kvm/x86.c:6587:3: note: insert '__attribute__((fallthrough));' to silence this warning case MSR_IA32_XSS: ^ __attribute__((fallthrough)); arch/x86/kvm/x86.c:6587:3: note: insert 'break;' to avoid fall-through case MSR_IA32_XSS: ^ break; 1 warning generated. vim +6587 arch/x86/kvm/x86.c 6513 6514 static void kvm_init_msr_list(void) 6515 { 6516 struct x86_pmu_capability x86_pmu; 6517 u32 dummy[2]; 6518 unsigned i; 6519 6520 BUILD_BUG_ON_MSG(INTEL_PMC_MAX_FIXED != 4, 6521 "Please update the fixed PMCs in msrs_to_saved_all[]"); 6522 6523 perf_get_x86_pmu_capability(&x86_pmu); 6524 6525 num_msrs_to_save = 0; 6526 num_emulated_msrs = 0; 6527 num_msr_based_features = 0; 6528 6529 for (i = 0; i < ARRAY_SIZE(msrs_to_save_all); i++) { 6530 if (rdmsr_safe(msrs_to_save_all[i], &dummy[0], &dummy[1]) < 0) 6531 continue; 6532 6533 /* 6534 * Even MSRs that are valid in the host may not be exposed 6535 * to the guests in some cases. 6536 */ 6537 switch (msrs_to_save_all[i]) { 6538 case MSR_IA32_BNDCFGS: 6539 if (!kvm_mpx_supported()) 6540 continue; 6541 break; 6542 case MSR_TSC_AUX: 6543 if (!kvm_cpu_cap_has(X86_FEATURE_RDTSCP) && 6544 !kvm_cpu_cap_has(X86_FEATURE_RDPID)) 6545 continue; 6546 break; 6547 case MSR_IA32_UMWAIT_CONTROL: 6548 if (!kvm_cpu_cap_has(X86_FEATURE_WAITPKG)) 6549 continue; 6550 break; 6551 case MSR_IA32_RTIT_CTL: 6552 case MSR_IA32_RTIT_STATUS: 6553 if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT)) 6554 continue; 6555 break; 6556 case MSR_IA32_RTIT_CR3_MATCH: 6557 if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT) || 6558 !intel_pt_validate_hw_cap(PT_CAP_cr3_filtering)) 6559 continue; 6560 break; 6561 case MSR_IA32_RTIT_OUTPUT_BASE: 6562 case MSR_IA32_RTIT_OUTPUT_MASK: 6563 if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT) || 6564 (!intel_pt_validate_hw_cap(PT_CAP_topa_output) && 6565 !intel_pt_validate_hw_cap(PT_CAP_single_range_output))) 6566 continue; 6567 break; 6568 case MSR_IA32_RTIT_ADDR0_A ... MSR_IA32_RTIT_ADDR3_B: 6569 if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT) || 6570 msrs_to_save_all[i] - MSR_IA32_RTIT_ADDR0_A >= 6571 intel_pt_validate_hw_cap(PT_CAP_num_address_ranges) * 2) 6572 continue; 6573 break; 6574 case MSR_ARCH_PERFMON_PERFCTR0 ... MSR_ARCH_PERFMON_PERFCTR0 + 17: 6575 if (msrs_to_save_all[i] - MSR_ARCH_PERFMON_PERFCTR0 >= 6576 min(INTEL_PMC_MAX_GENERIC, x86_pmu.num_counters_gp)) 6577 continue; 6578 break; 6579 case MSR_ARCH_PERFMON_EVENTSEL0 ... MSR_ARCH_PERFMON_EVENTSEL0 + 17: 6580 if (msrs_to_save_all[i] - MSR_ARCH_PERFMON_EVENTSEL0 >= 6581 min(INTEL_PMC_MAX_GENERIC, x86_pmu.num_counters_gp)) 6582 continue; 6583 break; 6584 case MSR_IA32_XFD: 6585 case MSR_IA32_XFD_ERR: 6586 if (!kvm_cpu_cap_has(X86_FEATURE_XFD)) 6588 if (!supported_xss) 6589 continue; 6590 break; 6591 default: 6592 break; 6593 } 6594 6595 msrs_to_save[num_msrs_to_save++] = msrs_to_save_all[i]; 6596 } 6597 6598 for (i = 0; i < ARRAY_SIZE(emulated_msrs_all); i++) { 6599 if (!static_call(kvm_x86_has_emulated_msr)(NULL, emulated_msrs_all[i])) 6600 continue; 6601 6602 emulated_msrs[num_emulated_msrs++] = emulated_msrs_all[i]; 6603 } 6604 6605 for (i = 0; i < ARRAY_SIZE(msr_based_features_all); i++) { 6606 struct kvm_msr_entry msr; 6607 6608 msr.index = msr_based_features_all[i]; 6609 if (kvm_get_msr_feature(&msr)) 6610 continue; 6611 6612 msr_based_features[num_msr_based_features++] = msr_based_features_all[i]; 6613 } 6614 } 6615 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org