Hi Yang, Thank you for the patch! Yet something to improve: [auto build test ERROR on kvm/linux-next] [also build test ERROR on next-20200331] [cannot apply to vhost/linux-next tip/auto-latest linus/master linux/master v5.6] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Yang-Weijiang/Introduce-support-... base: https://git.kernel.org/pub/scm/virt/kvm/kvm.git linux-next config: i386-allyesconfig (attached as .config) compiler: gcc-7 (Debian 7.4.0-6) 7.4.0 reproduce: # save the attached .config to linux build tree make ARCH=i386 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): arch/x86/kvm/x86.c: In function 'kvm_set_cr0': arch/x86/kvm/x86.c:807:53: error: 'X86_CR4_CET' undeclared (first use in this function); did you mean 'X86_CR4_DE'? if (!(cr0 & X86_CR0_WP) && kvm_read_cr4_bits(vcpu, X86_CR4_CET)) ^~~~~~~~~~~ X86_CR4_DE arch/x86/kvm/x86.c:807:53: note: each undeclared identifier is reported only once for each function it appears in arch/x86/kvm/x86.c: In function 'kvm_arch_hardware_setup': #define KVM_SUPPORTED_XSS (XFEATURE_MASK_CET_USER | \ ^ arch/x86/kvm/x86.c:9650:30: note: in expansion of macro 'KVM_SUPPORTED_XSS' supported_xss = host_xss & KVM_SUPPORTED_XSS; ^~~~~~~~~~~~~~~~~ XFEATURE_MASK_CET_KERNEL) ^ arch/x86/kvm/x86.c:9650:30: note: in expansion of macro 'KVM_SUPPORTED_XSS' supported_xss = host_xss & KVM_SUPPORTED_XSS; ^~~~~~~~~~~~~~~~~ vim +189 arch/x86/kvm/x86.c 18863bdd60f895 Avi Kivity 2009-09-07 183 cfc481810c903a Sean Christopherson 2020-03-02 184 #define KVM_SUPPORTED_XCR0 (XFEATURE_MASK_FP | XFEATURE_MASK_SSE \ cfc481810c903a Sean Christopherson 2020-03-02 185 | XFEATURE_MASK_YMM | XFEATURE_MASK_BNDREGS \ cfc481810c903a Sean Christopherson 2020-03-02 186 | XFEATURE_MASK_BNDCSR | XFEATURE_MASK_AVX512 \ cfc481810c903a Sean Christopherson 2020-03-02 187 | XFEATURE_MASK_PKRU) cfc481810c903a Sean Christopherson 2020-03-02 188 aae536c20cb181 Yang Weijiang 2020-03-26 @189 #define KVM_SUPPORTED_XSS (XFEATURE_MASK_CET_USER | \ aae536c20cb181 Yang Weijiang 2020-03-26 @190 XFEATURE_MASK_CET_KERNEL) aae536c20cb181 Yang Weijiang 2020-03-26 191 :::::: The code at line 189 was first introduced by commit :::::: aae536c20cb18180995aae27b30973f60e148ee7 KVM: VMX: Introduce CET VMX fields and flags :::::: TO: Yang Weijiang <weijiang.yang(a)intel.com&gt; :::::: CC: 0day robot <lkp(a)intel.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org