tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   20f1b5f9c07ca3a49e869327d4705b4254258756
commit: 52029198c1cec1e21513d74f87363a0408f28650 [4677/6863] KVM: arm64: Rework SVE host-save/guest-restore
config: arm64-randconfig-r033-20210325 (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
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/next/linux-next.git/commit/?id=52029198c1cec1e21513d74f87363a0408f28650
        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 52029198c1cec1e21513d74f87363a0408f28650
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   In file included from arch/arm64/kvm/hyp/nvhe/switch.c:8:
   arch/arm64/kvm/hyp/include/hyp/switch.h: In function '__hyp_sve_restore_guest':
>> arch/arm64/kvm/hyp/include/hyp/switch.h:211:2: error: implicit declaration of function 'sve_cond_update_zcr_vq' [-Werror=implicit-function-declaration]
     211 |  sve_cond_update_zcr_vq(vcpu_sve_max_vq(vcpu) - 1, SYS_ZCR_EL2);
         |  ^~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/hyp/nvhe/switch.c: At top level:
   arch/arm64/kvm/hyp/nvhe/switch.c:278:17: warning: no previous prototype for 'kvm_unexpected_el2_exception' [-Wmissing-prototypes]
     278 | asmlinkage void kvm_unexpected_el2_exception(void)
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors
--
   In file included from arch/arm64/kvm/hyp/nvhe/hyp-main.c:7:
   arch/arm64/kvm/hyp/include/hyp/switch.h: In function '__hyp_sve_restore_guest':
>> arch/arm64/kvm/hyp/include/hyp/switch.h:211:2: error: implicit declaration of function 'sve_cond_update_zcr_vq' [-Werror=implicit-function-declaration]
     211 |  sve_cond_update_zcr_vq(vcpu_sve_max_vq(vcpu) - 1, SYS_ZCR_EL2);
         |  ^~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/hyp/nvhe/hyp-main.c: At top level:
   arch/arm64/kvm/hyp/nvhe/hyp-main.c:169:6: warning: no previous prototype for 'handle_trap' [-Wmissing-prototypes]
     169 | void handle_trap(struct kvm_cpu_context *host_ctxt)
         |      ^~~~~~~~~~~
   cc1: some warnings being treated as errors
--
   In file included from arch/arm64/kvm/hyp/vhe/switch.c:8:
   arch/arm64/kvm/hyp/include/hyp/switch.h: In function '__hyp_sve_restore_guest':
>> arch/arm64/kvm/hyp/include/hyp/switch.h:211:2: error: implicit declaration of function 'sve_cond_update_zcr_vq' [-Werror=implicit-function-declaration]
     211 |  sve_cond_update_zcr_vq(vcpu_sve_max_vq(vcpu) - 1, SYS_ZCR_EL2);
         |  ^~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/hyp/vhe/switch.c: At top level:
   arch/arm64/kvm/hyp/vhe/switch.c:227:17: warning: no previous prototype for 'kvm_unexpected_el2_exception' [-Wmissing-prototypes]
     227 | asmlinkage void kvm_unexpected_el2_exception(void)
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/sve_cond_update_zcr_vq +211 arch/arm64/kvm/hyp/include/hyp/switch.h

   208	
   209	static inline void __hyp_sve_restore_guest(struct kvm_vcpu *vcpu)
   210	{
 > 211		sve_cond_update_zcr_vq(vcpu_sve_max_vq(vcpu) - 1, SYS_ZCR_EL2);
   212		__sve_restore_state(vcpu_sve_pffr(vcpu),
   213				    &vcpu->arch.ctxt.fp_regs.fpsr);
   214		write_sysreg_el1(__vcpu_sys_reg(vcpu, ZCR_EL1), SYS_ZCR);
   215	}
   216	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org