tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/cpu head: 707e6befd43ba8d754485d8d02ed4f49ec8ec667 commit: 54f792cc63c56d994651c8e83d059d6fac00fbf9 [11/17] x86/entry/64: Handle FSGSBASE enabled paranoid entry/exit config: x86_64-kexec (attached as .config) compiler: gcc-7 (Debian 7.3.0-1) 7.3.0 reproduce: git checkout 54f792cc63c56d994651c8e83d059d6fac00fbf9 # save the attached .config to linux build tree make ARCH=x86_64
If you fix the issue, kindly add following tag Reported-by: kbuild test robot <l...@intel.com> All errors (new ones prefixed by >>): arch/x86/entry/entry_64.S: Assembler messages: >> arch/x86/entry/entry_64.S:1214: Error: no such instruction: >> `save_and_set_gsbase scratch_reg=%rax save_reg=%rbx' vim +1214 arch/x86/entry/entry_64.S 1165 1166 /* 1167 * Save all registers in pt_regs. Return GSBASE related information 1168 * in EBX depending on the availability of the FSGSBASE instructions: 1169 * 1170 * FSGSBASE R/EBX 1171 * N 0 -> SWAPGS on exit 1172 * 1 -> no SWAPGS on exit 1173 * 1174 * Y GSBASE value at entry, must be restored in paranoid_exit 1175 */ 1176 ENTRY(paranoid_entry) 1177 UNWIND_HINT_FUNC 1178 cld 1179 PUSH_AND_CLEAR_REGS save_ret=1 1180 ENCODE_FRAME_POINTER 8 1181 1182 /* 1183 * Always stash CR3 in %r14. This value will be restored, 1184 * verbatim, at exit. Needed if paranoid_entry interrupted 1185 * another entry that already switched to the user CR3 value 1186 * but has not yet returned to userspace. 1187 * 1188 * This is also why CS (stashed in the "iret frame" by the 1189 * hardware at entry) can not be used: this may be a return 1190 * to kernel code, but with a user CR3 value. 1191 * 1192 * Switching CR3 does not depend on kernel GSBASE so it can 1193 * be done before switching to the kernel GSBASE. This is 1194 * required for FSGSBASE because the kernel GSBASE has to 1195 * be retrieved from a kernel internal table. 1196 */ 1197 SAVE_AND_SWITCH_TO_KERNEL_CR3 scratch_reg=%rax save_reg=%r14 1198 1199 /* 1200 * Handling GSBASE depends on the availability of FSGSBASE. 1201 * 1202 * Without FSGSBASE the kernel enforces that negative GSBASE 1203 * values indicate kernel GSBASE. With FSGSBASE no assumptions 1204 * can be made about the GSBASE value when entering from user 1205 * space. 1206 */ 1207 ALTERNATIVE "jmp .Lparanoid_entry_checkgs", "", X86_FEATURE_FSGSBASE 1208 1209 /* 1210 * Read the current GSBASE and store it in in %rbx unconditionally, 1211 * retrieve and set the current CPUs kernel GSBASE. The stored value 1212 * has to be restored in paranoid_exit unconditionally. 1213 */ > 1214 SAVE_AND_SET_GSBASE scratch_reg=%rax save_reg=%rbx 1215 ret 1216 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
.config.gz
Description: application/gzip
