Hi Stephen, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 4238b1710eadd18dd16de0288a2bc5bb84614b4e commit: 954e285eafdd4ac36b114a7f6abce3f792591ea8 [12154/12271] Merge remote-tracking branch 'kvm-arm/next' config: x86_64-rhel-8.3-kselftests (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=954e285eafdd4ac36b114a7f6abce3f792591ea8 git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 954e285eafdd4ac36b114a7f6abce3f792591ea8 # save the attached .config to linux build tree make W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All error/warnings (new ones prefixed by >>): x86_64/hyperv_features.c: In function 'main': >> x86_64/hyperv_features.c:618:2: warning: implicit declaration of function 'vm_handle_exception' [-Wimplicit-function-declaration] 618 | vm_handle_exception(vm, GP_VECTOR, guest_gp_handler); | ^~~~~~~~~~~~~~~~~~~ /usr/bin/ld: /tmp/ccIBsVo3.o: in function `main': >> tools/testing/selftests/kvm/x86_64/hyperv_features.c:618: undefined reference to `vm_handle_exception' collect2: error: ld returned 1 exit status -- x86_64/hyperv_features.c: In function 'main': >> x86_64/hyperv_features.c:618:2: warning: implicit declaration of function 'vm_handle_exception' [-Wimplicit-function-declaration] 618 | vm_handle_exception(vm, GP_VECTOR, guest_gp_handler); | ^~~~~~~~~~~~~~~~~~~ /usr/bin/ld: /tmp/cc7zqGvp.o: in function `main': >> tools/testing/selftests/kvm/x86_64/hyperv_features.c:618: undefined reference to `vm_handle_exception' collect2: error: ld returned 1 exit status vim +618 tools/testing/selftests/kvm/x86_64/hyperv_features.c e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 593 e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 594 int main(void) e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 595 { e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 596 struct kvm_cpuid2 *best; e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 597 struct kvm_vm *vm; e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 598 vm_vaddr_t msr_gva, hcall_page, hcall_params; e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 599 struct kvm_enable_cap cap = { e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 600 .cap = KVM_CAP_HYPERV_ENFORCE_CPUID, e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 601 .args = {1} e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 602 }; e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 603 e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 604 /* Test MSRs */ e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 605 vm = vm_create_default(VCPU_ID, 0, guest_msr); e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 606 e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 607 msr_gva = vm_vaddr_alloc(vm, getpagesize(), 0x10000, 0, 0); e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 608 memset(addr_gva2hva(vm, msr_gva), 0x0, getpagesize()); e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 609 vcpu_args_set(vm, VCPU_ID, 1, msr_gva); e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 610 vcpu_enable_cap(vm, VCPU_ID, &cap); e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 611 e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 612 vcpu_set_hv_cpuid(vm, VCPU_ID); e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 613 e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 614 best = kvm_get_supported_hv_cpuid(); e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 615 e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 616 vm_init_descriptor_tables(vm); e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 617 vcpu_init_descriptor_tables(vm, VCPU_ID); e2e1cc1fbe54a9 Vitaly Kuznetsov 2021-05-21 @618 vm_handle_exception(vm, GP_VECTOR, guest_gp_handler); :::::: The code at line 618 was first introduced by commit :::::: e2e1cc1fbe54a9520956a4539a3676d2ebf122dd KVM: selftests: Introduce hyperv_features test :::::: TO: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> :::::: CC: Paolo Bonzini <pbonzini@xxxxxxxxxx> --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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