Hi Janis, Thank you for the patch! Yet something to improve: [auto build test ERROR on kvm/queue] [also build test ERROR on lwn/docs-next linus/master] [cannot apply to kvms390/next kvm/linux-next] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Janis-Schoetterl-Glausch/KVM-s390-selftest-memop-Pass-mop_desc-via-pointer/20230128-132603 base: https://git.kernel.org/pub/scm/virt/kvm/kvm.git queue patch link: https://lore.kernel.org/r/20230125212608.1860251-13-scgl%40linux.ibm.com patch subject: [PATCH v6 12/14] KVM: s390: Extend MEM_OP ioctl by storage key checked cmpxchg config: s390-allyesconfig (https://download.01.org/0day-ci/archive/20230128/202301281752.6gSopuWh-lkp@xxxxxxxxx/config) compiler: s390-linux-gcc (GCC) 12.1.0 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/intel-lab-lkp/linux/commit/6e6b3d99b9978a70b148b989d46b039feda3a3c3 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Janis-Schoetterl-Glausch/KVM-s390-selftest-memop-Pass-mop_desc-via-pointer/20230128-132603 git checkout 6e6b3d99b9978a70b148b989d46b039feda3a3c3 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=s390 olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): arch/s390/kvm/gaccess.c: In function 'cmpxchg_guest_abs_with_key': >> arch/s390/kvm/gaccess.c:1217:23: error: implicit declaration of function 'cmpxchg_user_key'; did you mean 'copy_to_user_key'? [-Werror=implicit-function-declaration] 1217 | ret = cmpxchg_user_key((u8 *)hva, &old, *old_addr, new, access_key); | ^~~~~~~~~~~~~~~~ | copy_to_user_key cc1: some warnings being treated as errors vim +1217 arch/s390/kvm/gaccess.c 1163 1164 /** 1165 * cmpxchg_guest_abs_with_key() - Perform cmpxchg on guest absolute address. 1166 * @kvm: Virtual machine instance. 1167 * @gpa: Absolute guest address of the location to be changed. 1168 * @len: Operand length of the cmpxchg, required: 1 <= len <= 16. Providing a 1169 * non power of two will result in failure. 1170 * @old_addr: Pointer to old value. If the location at @gpa contains this value, 1171 * the exchange will succeed. After calling cmpxchg_guest_abs_with_key() 1172 * *@old_addr contains the value at @gpa before the attempt to 1173 * exchange the value. 1174 * @new: The value to place at @gpa. 1175 * @access_key: The access key to use for the guest access. 1176 * @success: output value indicating if an exchange occurred. 1177 * 1178 * Atomically exchange the value at @gpa by @new, if it contains *@old. 1179 * Honors storage keys. 1180 * 1181 * Return: * 0: successful exchange 1182 * * a program interruption code indicating the reason cmpxchg could 1183 * not be attempted 1184 * * -EINVAL: address misaligned or len not power of two 1185 * * -EAGAIN: transient failure (len 1 or 2) 1186 * * -EOPNOTSUPP: read-only memslot (should never occur) 1187 */ 1188 int cmpxchg_guest_abs_with_key(struct kvm *kvm, gpa_t gpa, int len, 1189 __uint128_t *old_addr, __uint128_t new, 1190 u8 access_key, bool *success) 1191 { 1192 gfn_t gfn = gpa >> PAGE_SHIFT; 1193 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); 1194 bool writable; 1195 hva_t hva; 1196 int ret; 1197 1198 if (!IS_ALIGNED(gpa, len)) 1199 return -EINVAL; 1200 1201 hva = gfn_to_hva_memslot_prot(slot, gfn, &writable); 1202 if (kvm_is_error_hva(hva)) 1203 return PGM_ADDRESSING; 1204 /* 1205 * Check if it's a read-only memslot, even though that cannot occur 1206 * since those are unsupported. 1207 * Don't try to actually handle that case. 1208 */ 1209 if (!writable) 1210 return -EOPNOTSUPP; 1211 1212 hva += offset_in_page(gpa); 1213 switch (len) { 1214 case 1: { 1215 u8 old; 1216 > 1217 ret = cmpxchg_user_key((u8 *)hva, &old, *old_addr, new, access_key); 1218 *success = !ret && old == *old_addr; 1219 *old_addr = old; 1220 break; 1221 } 1222 case 2: { 1223 u16 old; 1224 1225 ret = cmpxchg_user_key((u16 *)hva, &old, *old_addr, new, access_key); 1226 *success = !ret && old == *old_addr; 1227 *old_addr = old; 1228 break; 1229 } 1230 case 4: { 1231 u32 old; 1232 1233 ret = cmpxchg_user_key((u32 *)hva, &old, *old_addr, new, access_key); 1234 *success = !ret && old == *old_addr; 1235 *old_addr = old; 1236 break; 1237 } 1238 case 8: { 1239 u64 old; 1240 1241 ret = cmpxchg_user_key((u64 *)hva, &old, *old_addr, new, access_key); 1242 *success = !ret && old == *old_addr; 1243 *old_addr = old; 1244 break; 1245 } 1246 case 16: { 1247 __uint128_t old; 1248 1249 ret = cmpxchg_user_key((__uint128_t *)hva, &old, *old_addr, new, access_key); 1250 *success = !ret && old == *old_addr; 1251 *old_addr = old; 1252 break; 1253 } 1254 default: 1255 return -EINVAL; 1256 } 1257 mark_page_dirty_in_slot(kvm, slot, gfn); 1258 /* 1259 * Assume that the fault is caused by protection, either key protection 1260 * or user page write protection. 1261 */ 1262 if (ret == -EFAULT) 1263 ret = PGM_PROTECTION; 1264 return ret; 1265 } 1266 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests
