Hi Roman, kernel test robot noticed the following build errors: [auto build test ERROR on d9016a249be5316ec2476f9947356711e70a16ec] url: https://github.com/intel-lab-lkp/linux/commits/Roman-Kisel/Documentation-hyperv-Confidential-VMBus/20250715-062125 base: d9016a249be5316ec2476f9947356711e70a16ec patch link: https://lore.kernel.org/r/20250714221545.5615-5-romank%40linux.microsoft.com patch subject: [PATCH hyperv-next v4 04/16] arch/x86: mshyperv: Trap on access for some synthetic MSRs config: x86_64-buildonly-randconfig-002-20250715 (https://download.01.org/0day-ci/archive/20250716/202507160105.yQ34bnKl-lkp@xxxxxxxxx/config) compiler: gcc-12 (Debian 12.2.0-14+deb12u1) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250716/202507160105.yQ34bnKl-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/202507160105.yQ34bnKl-lkp@xxxxxxxxx/ All errors (new ones prefixed by >>): ld: vmlinux.o: in function `hv_set_non_nested_msr': >> arch/x86/kernel/cpu/mshyperv.c:91: undefined reference to `vmbus_is_confidential' vim +91 arch/x86/kernel/cpu/mshyperv.c 79 80 void hv_set_non_nested_msr(unsigned int reg, u64 value) 81 { 82 if (hv_is_synic_msr(reg) && ms_hyperv.paravisor_present) { 83 /* The hypervisor will get the intercept. */ 84 hv_ivm_msr_write(reg, value); 85 86 if (hv_is_sint_msr(reg)) { 87 /* 88 * Write proxy bit in the case of non-confidential VMBus. 89 * Using wrmsrq instruction so the following goes to the paravisor. 90 */ > 91 u32 proxy = vmbus_is_confidential() ? 0 : 1; 92 93 value |= (proxy << 20); 94 native_wrmsrq(reg, value); 95 } 96 } else { 97 native_wrmsrq(reg, value); 98 } 99 } 100 EXPORT_SYMBOL_GPL(hv_set_non_nested_msr); 101 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
