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-features-for-protected-VMs/20211009-000118 base: 1da38549dd64c7f5dd22427f12dfa8db3d8a722b config: arm64-defconfig (attached as .config) compiler: aarch64-linux-gcc (GCC) 11.2.0 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://github.com/0day-ci/linux/commit/59df1c9264ed417b7662e7520143c3d7b9ecad25 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/20211009-000118 git checkout 59df1c9264ed417b7662e7520143c3d7b9ecad25 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> arch/arm64/kvm/hyp/nvhe/sys_regs.c:28:6: warning: no previous prototype for 'inject_undef64' [-Wmissing-prototypes] 28 | void inject_undef64(struct kvm_vcpu *vcpu) | ^~~~~~~~~~~~~~ >> arch/arm64/kvm/hyp/nvhe/sys_regs.c:81:5: warning: no previous prototype for 'get_pvm_id_aa64pfr0' [-Wmissing-prototypes] 81 | u64 get_pvm_id_aa64pfr0(const struct kvm_vcpu *vcpu) | ^~~~~~~~~~~~~~~~~~~ >> arch/arm64/kvm/hyp/nvhe/sys_regs.c:102:5: warning: no previous prototype for 'get_pvm_id_aa64pfr1' [-Wmissing-prototypes] 102 | u64 get_pvm_id_aa64pfr1(const struct kvm_vcpu *vcpu) | ^~~~~~~~~~~~~~~~~~~ >> arch/arm64/kvm/hyp/nvhe/sys_regs.c:113:5: warning: no previous prototype for 'get_pvm_id_aa64zfr0' [-Wmissing-prototypes] 113 | u64 get_pvm_id_aa64zfr0(const struct kvm_vcpu *vcpu) | ^~~~~~~~~~~~~~~~~~~ >> arch/arm64/kvm/hyp/nvhe/sys_regs.c:123:5: warning: no previous prototype for 'get_pvm_id_aa64dfr0' [-Wmissing-prototypes] 123 | u64 get_pvm_id_aa64dfr0(const struct kvm_vcpu *vcpu) | ^~~~~~~~~~~~~~~~~~~ >> arch/arm64/kvm/hyp/nvhe/sys_regs.c:133:5: warning: no previous prototype for 'get_pvm_id_aa64dfr1' [-Wmissing-prototypes] 133 | u64 get_pvm_id_aa64dfr1(const struct kvm_vcpu *vcpu) | ^~~~~~~~~~~~~~~~~~~ >> arch/arm64/kvm/hyp/nvhe/sys_regs.c:143:5: warning: no previous prototype for 'get_pvm_id_aa64afr0' [-Wmissing-prototypes] 143 | u64 get_pvm_id_aa64afr0(const struct kvm_vcpu *vcpu) | ^~~~~~~~~~~~~~~~~~~ >> arch/arm64/kvm/hyp/nvhe/sys_regs.c:153:5: warning: no previous prototype for 'get_pvm_id_aa64afr1' [-Wmissing-prototypes] 153 | u64 get_pvm_id_aa64afr1(const struct kvm_vcpu *vcpu) | ^~~~~~~~~~~~~~~~~~~ >> arch/arm64/kvm/hyp/nvhe/sys_regs.c:163:5: warning: no previous prototype for 'get_pvm_id_aa64isar0' [-Wmissing-prototypes] 163 | u64 get_pvm_id_aa64isar0(const struct kvm_vcpu *vcpu) | ^~~~~~~~~~~~~~~~~~~~ >> arch/arm64/kvm/hyp/nvhe/sys_regs.c:168:5: warning: no previous prototype for 'get_pvm_id_aa64isar1' [-Wmissing-prototypes] 168 | u64 get_pvm_id_aa64isar1(const struct kvm_vcpu *vcpu) | ^~~~~~~~~~~~~~~~~~~~ >> arch/arm64/kvm/hyp/nvhe/sys_regs.c:181:5: warning: no previous prototype for 'get_pvm_id_aa64mmfr0' [-Wmissing-prototypes] 181 | u64 get_pvm_id_aa64mmfr0(const struct kvm_vcpu *vcpu) | ^~~~~~~~~~~~~~~~~~~~ >> arch/arm64/kvm/hyp/nvhe/sys_regs.c:191:5: warning: no previous prototype for 'get_pvm_id_aa64mmfr1' [-Wmissing-prototypes] 191 | u64 get_pvm_id_aa64mmfr1(const struct kvm_vcpu *vcpu) | ^~~~~~~~~~~~~~~~~~~~ >> arch/arm64/kvm/hyp/nvhe/sys_regs.c:196:5: warning: no previous prototype for 'get_pvm_id_aa64mmfr2' [-Wmissing-prototypes] 196 | u64 get_pvm_id_aa64mmfr2(const struct kvm_vcpu *vcpu) | ^~~~~~~~~~~~~~~~~~~~ >> arch/arm64/kvm/hyp/nvhe/sys_regs.c:448:5: warning: no previous prototype for 'kvm_check_pvm_sysreg_table' [-Wmissing-prototypes] 448 | int kvm_check_pvm_sysreg_table(void) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ >> arch/arm64/kvm/hyp/nvhe/sys_regs.c:466:6: warning: no previous prototype for 'kvm_handle_pvm_sysreg' [-Wmissing-prototypes] 466 | bool kvm_handle_pvm_sysreg(struct kvm_vcpu *vcpu, u64 *exit_code) | ^~~~~~~~~~~~~~~~~~~~~ vim +/inject_undef64 +28 arch/arm64/kvm/hyp/nvhe/sys_regs.c 23 24 /* 25 * Inject an unknown/undefined exception to an AArch64 guest while most of its 26 * sysregs are live. 27 */ > 28 void inject_undef64(struct kvm_vcpu *vcpu) 29 { 30 u32 esr = (ESR_ELx_EC_UNKNOWN << ESR_ELx_EC_SHIFT); 31 32 *vcpu_pc(vcpu) = read_sysreg_el2(SYS_ELR); 33 *vcpu_cpsr(vcpu) = read_sysreg_el2(SYS_SPSR); 34 35 vcpu->arch.flags |= (KVM_ARM64_EXCEPT_AA64_EL1 | 36 KVM_ARM64_EXCEPT_AA64_ELx_SYNC | 37 KVM_ARM64_PENDING_EXCEPTION); 38 39 __kvm_adjust_pc(vcpu); 40 41 write_sysreg_el1(esr, SYS_ESR); 42 write_sysreg_el1(read_sysreg_el2(SYS_ELR), SYS_ELR); 43 write_sysreg_el2(*vcpu_pc(vcpu), SYS_ELR); 44 write_sysreg_el2(*vcpu_cpsr(vcpu), SYS_SPSR); 45 } 46 47 /* 48 * Returns the restricted features values of the feature register based on the 49 * limitations in restrict_fields. 50 * A feature id field value of 0b0000 does not impose any restrictions. 51 * Note: Use only for unsigned feature field values. 52 */ 53 static u64 get_restricted_features_unsigned(u64 sys_reg_val, 54 u64 restrict_fields) 55 { 56 u64 value = 0UL; 57 u64 mask = GENMASK_ULL(ARM64_FEATURE_FIELD_BITS - 1, 0); 58 59 /* 60 * According to the Arm Architecture Reference Manual, feature fields 61 * use increasing values to indicate increases in functionality. 62 * Iterate over the restricted feature fields and calculate the minimum 63 * unsigned value between the one supported by the system, and what the 64 * value is being restricted to. 65 */ 66 while (sys_reg_val && restrict_fields) { 67 value |= min(sys_reg_val & mask, restrict_fields & mask); 68 sys_reg_val &= ~mask; 69 restrict_fields &= ~mask; 70 mask <<= ARM64_FEATURE_FIELD_BITS; 71 } 72 73 return value; 74 } 75 76 /* 77 * Functions that return the value of feature id registers for protected VMs 78 * based on allowed features, system features, and KVM support. 79 */ 80 > 81 u64 get_pvm_id_aa64pfr0(const struct kvm_vcpu *vcpu) 82 { 83 const struct kvm *kvm = (const struct kvm *)kern_hyp_va(vcpu->kvm); 84 u64 set_mask = 0; 85 u64 allow_mask = PVM_ID_AA64PFR0_ALLOW; 86 87 if (!vcpu_has_sve(vcpu)) 88 allow_mask &= ~ARM64_FEATURE_MASK(ID_AA64PFR0_SVE); 89 90 set_mask |= get_restricted_features_unsigned(id_aa64pfr0_el1_sys_val, 91 PVM_ID_AA64PFR0_RESTRICT_UNSIGNED); 92 93 /* Spectre and Meltdown mitigation in KVM */ 94 set_mask |= FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_CSV2), 95 (u64)kvm->arch.pfr0_csv2); 96 set_mask |= FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_CSV3), 97 (u64)kvm->arch.pfr0_csv3); 98 99 return (id_aa64pfr0_el1_sys_val & allow_mask) | set_mask; 100 } 101 > 102 u64 get_pvm_id_aa64pfr1(const struct kvm_vcpu *vcpu) 103 { 104 const struct kvm *kvm = (const struct kvm *)kern_hyp_va(vcpu->kvm); 105 u64 allow_mask = PVM_ID_AA64PFR1_ALLOW; 106 107 if (!kvm_has_mte(kvm)) 108 allow_mask &= ~ARM64_FEATURE_MASK(ID_AA64PFR1_MTE); 109 110 return id_aa64pfr1_el1_sys_val & allow_mask; 111 } 112 > 113 u64 get_pvm_id_aa64zfr0(const struct kvm_vcpu *vcpu) 114 { 115 /* 116 * No support for Scalable Vectors, therefore, hyp has no sanitized 117 * copy of the feature id register. 118 */ 119 BUILD_BUG_ON(PVM_ID_AA64ZFR0_ALLOW != 0ULL); 120 return 0; 121 } 122 > 123 u64 get_pvm_id_aa64dfr0(const struct kvm_vcpu *vcpu) 124 { 125 /* 126 * No support for debug, including breakpoints, and watchpoints, 127 * therefore, pKVM has no sanitized copy of the feature id register. 128 */ 129 BUILD_BUG_ON(PVM_ID_AA64DFR0_ALLOW != 0ULL); 130 return 0; 131 } 132 > 133 u64 get_pvm_id_aa64dfr1(const struct kvm_vcpu *vcpu) 134 { 135 /* 136 * No support for debug, therefore, hyp has no sanitized copy of the 137 * feature id register. 138 */ 139 BUILD_BUG_ON(PVM_ID_AA64DFR1_ALLOW != 0ULL); 140 return 0; 141 } 142 > 143 u64 get_pvm_id_aa64afr0(const struct kvm_vcpu *vcpu) 144 { 145 /* 146 * No support for implementation defined features, therefore, hyp has no 147 * sanitized copy of the feature id register. 148 */ 149 BUILD_BUG_ON(PVM_ID_AA64AFR0_ALLOW != 0ULL); 150 return 0; 151 } 152 > 153 u64 get_pvm_id_aa64afr1(const struct kvm_vcpu *vcpu) 154 { 155 /* 156 * No support for implementation defined features, therefore, hyp has no 157 * sanitized copy of the feature id register. 158 */ 159 BUILD_BUG_ON(PVM_ID_AA64AFR1_ALLOW != 0ULL); 160 return 0; 161 } 162 > 163 u64 get_pvm_id_aa64isar0(const struct kvm_vcpu *vcpu) 164 { 165 return id_aa64isar0_el1_sys_val & PVM_ID_AA64ISAR0_ALLOW; 166 } 167 > 168 u64 get_pvm_id_aa64isar1(const struct kvm_vcpu *vcpu) 169 { 170 u64 allow_mask = PVM_ID_AA64ISAR1_ALLOW; 171 172 if (!vcpu_has_ptrauth(vcpu)) 173 allow_mask &= ~(ARM64_FEATURE_MASK(ID_AA64ISAR1_APA) | 174 ARM64_FEATURE_MASK(ID_AA64ISAR1_API) | 175 ARM64_FEATURE_MASK(ID_AA64ISAR1_GPA) | 176 ARM64_FEATURE_MASK(ID_AA64ISAR1_GPI)); 177 178 return id_aa64isar1_el1_sys_val & allow_mask; 179 } 180 > 181 u64 get_pvm_id_aa64mmfr0(const struct kvm_vcpu *vcpu) 182 { 183 u64 set_mask; 184 185 set_mask = get_restricted_features_unsigned(id_aa64mmfr0_el1_sys_val, 186 PVM_ID_AA64MMFR0_RESTRICT_UNSIGNED); 187 188 return (id_aa64mmfr0_el1_sys_val & PVM_ID_AA64MMFR0_ALLOW) | set_mask; 189 } 190 > 191 u64 get_pvm_id_aa64mmfr1(const struct kvm_vcpu *vcpu) 192 { 193 return id_aa64mmfr1_el1_sys_val & PVM_ID_AA64MMFR1_ALLOW; 194 } 195 > 196 u64 get_pvm_id_aa64mmfr2(const struct kvm_vcpu *vcpu) 197 { 198 return id_aa64mmfr2_el1_sys_val & PVM_ID_AA64MMFR2_ALLOW; 199 } 200 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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