Hi Fuad, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on 1da38549dd64c7f5dd22427f12dfa8db3d8a722b] url: https://github.com/0day-ci/linux/commits/Fuad-Tabba/KVM-arm64-Fixed-featu... base: 1da38549dd64c7f5dd22427f12dfa8db3d8a722b config: arm64-randconfig-r016-20211014 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project acb3b187c4c88650a6a717a1bcb234d27d0d7f54) 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 arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://github.com/0day-ci/linux/commit/6d9b1ae6b6b20f6f4300e46a17bb9d42e... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Fuad-Tabba/KVM-arm64-Fixed-features-for-protected-VMs/20211010-225842 git checkout 6d9b1ae6b6b20f6f4300e46a17bb9d42eadd3a79 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/ 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 >>): arch/arm64/kvm/hyp/nvhe/switch.c:126: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst * Disable host events, enable guest events arch/arm64/kvm/hyp/nvhe/switch.c:146: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst * Disable guest events, enable host events arch/arm64/kvm/hyp/nvhe/switch.c:164: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst * Handler for protected VM restricted exceptions. arch/arm64/kvm/hyp/nvhe/switch.c:176: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst * Handler for protected VM MSR, MRS or System instruction execution in AArch64. arch/arm64/kvm/hyp/nvhe/switch.c:196: warning: Function parameter or member 'vcpu' not described in 'kvm_handle_pvm_fpsimd' arch/arm64/kvm/hyp/nvhe/switch.c:196: warning: Function parameter or member 'exit_code' not described in 'kvm_handle_pvm_fpsimd' vim +196 arch/arm64/kvm/hyp/nvhe/switch.c 188 189 /** 190 * Handler for protected floating-point and Advanced SIMD accesses. 191 * 192 * Returns true if the hypervisor has handled the exit, and control should go 193 * back to the guest, or false if it hasn't. 194 */ 195 static bool kvm_handle_pvm_fpsimd(struct kvm_vcpu *vcpu, u64 *exit_code) 197 /* Linux guests assume support for floating-point and Advanced SIMD. */ 198 BUILD_BUG_ON(!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64PFR0_FP), 199 PVM_ID_AA64PFR0_ALLOW)); 200 BUILD_BUG_ON(!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64PFR0_ASIMD), 201 PVM_ID_AA64PFR0_ALLOW)); 202 203 return kvm_hyp_handle_fpsimd(vcpu, exit_code); 204 } 205 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org