tree: https://github.com/agraf/linux-2.6.git snp-host-v10 head: 689d7ab69df8f6bff29bd1dbefe7c07bba52a9ac commit: 7187f30c29e7c30b39e34bb3ab06ecbf034800ab [65/108] x86/fault: Add helper for dumping RMP entries config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20231109/202311092152.UjfN6FW5-lkp@xxxxxxxxx/config) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231109/202311092152.UjfN6FW5-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202311092152.UjfN6FW5-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): arch/x86/virt/svm/sev.c:280:5: warning: no previous prototype for 'snp_lookup_rmpentry' [-Wmissing-prototypes] 280 | int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level) | ^~~~~~~~~~~~~~~~~~~ >> arch/x86/virt/svm/sev.c:352:6: warning: no previous prototype for 'sev_dump_hva_rmpentry' [-Wmissing-prototypes] 352 | void sev_dump_hva_rmpentry(unsigned long hva) | ^~~~~~~~~~~~~~~~~~~~~ vim +/sev_dump_hva_rmpentry +352 arch/x86/virt/svm/sev.c 279 > 280 int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level) 281 { 282 struct rmpentry e; 283 int ret; 284 285 ret = __snp_lookup_rmpentry(pfn, &e, level); 286 if (ret) 287 return ret; 288 289 *assigned = !!e.assigned; 290 return 0; 291 } 292 EXPORT_SYMBOL_GPL(snp_lookup_rmpentry); 293 294 /* 295 * Dump the raw RMP entry for a particular PFN. These bits are documented in the 296 * PPR for a particular CPU model and provide useful information about how a 297 * particular PFN is being utilized by the kernel/firmware at the time certain 298 * unexpected events occur, such as RMP faults. 299 */ 300 static void sev_dump_rmpentry(u64 dumped_pfn) 301 { 302 struct rmpentry e; 303 u64 pfn, pfn_end; 304 int level, ret; 305 u64 *e_data; 306 307 ret = __snp_lookup_rmpentry(dumped_pfn, &e, &level); 308 if (ret) { 309 pr_info("Failed to read RMP entry for PFN 0x%llx, error %d\n", 310 dumped_pfn, ret); 311 return; 312 } 313 314 e_data = (u64 *)&e; 315 if (e.assigned) { 316 pr_info("RMP entry for PFN 0x%llx: [high=0x%016llx low=0x%016llx]\n", 317 dumped_pfn, e_data[1], e_data[0]); 318 return; 319 } 320 321 /* 322 * If the RMP entry for a particular PFN is not in an assigned state, 323 * then it is sometimes useful to get an idea of whether or not any RMP 324 * entries for other PFNs within the same 2MB region are assigned, since 325 * those too can affect the ability to access a particular PFN in 326 * certain situations, such as when the PFN is being accessed via a 2MB 327 * mapping in the host page table. 328 */ 329 pfn = ALIGN(dumped_pfn, PTRS_PER_PMD); 330 pfn_end = pfn + PTRS_PER_PMD; 331 332 while (pfn < pfn_end) { 333 ret = __snp_lookup_rmpentry(pfn, &e, &level); 334 if (ret) { 335 pr_info_ratelimited("Failed to read RMP entry for PFN 0x%llx\n", pfn); 336 pfn++; 337 continue; 338 } 339 340 if (e_data[0] || e_data[1]) { 341 pr_info("No assigned RMP entry for PFN 0x%llx, but the 2MB region contains populated RMP entries, e.g.: PFN 0x%llx: [high=0x%016llx low=0x%016llx]\n", 342 dumped_pfn, pfn, e_data[1], e_data[0]); 343 return; 344 } 345 pfn++; 346 } 347 348 pr_info("No populated RMP entries in the 2MB region containing PFN 0x%llx\n", 349 dumped_pfn); 350 } 351 > 352 void sev_dump_hva_rmpentry(unsigned long hva) -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
