tree: https://github.com/intel/tdx.git guest head: 224dd4925275ef73ef78f1412d6f9d03564294eb commit: 90e5df51a2da1f8175059239595bfa7c8086b5c3 [29/76] x86/tdx: Make pages shared in ioremap() config: x86_64-randconfig-b001-20210615 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 64720f57bea6a6bf033feef4a5751ab9c0c3b401) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://github.com/intel/tdx/commit/90e5df51a2da1f8175059239595bfa7c8086b5c3 git remote add intel-tdx https://github.com/intel/tdx.git git fetch --no-tags intel-tdx guest git checkout 90e5df51a2da1f8175059239595bfa7c8086b5c3 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): prot = pgprot_protected_guest(prot); ^ arch/x86/include/asm/pgtable.h:26:12: note: expanded from macro 'pgprot_protected_guest' tdg_shared_mask()) ^ arch/x86/mm/ioremap.c:721:17: warning: no previous prototype for function 'early_memremap_pgprot_adjust' [-Wmissing-prototypes] pgprot_t __init early_memremap_pgprot_adjust(resource_size_t phys_addr, ^ arch/x86/mm/ioremap.c:721:1: note: declare 'static' if the function is not intended to be used outside of this translation unit pgprot_t __init early_memremap_pgprot_adjust(resource_size_t phys_addr, ^ static 1 warning and 1 error generated. vim +/tdg_shared_mask +249 arch/x86/mm/ioremap.c 161 162 /* 163 * Remap an arbitrary physical address space into the kernel virtual 164 * address space. It transparently creates kernel huge I/O mapping when 165 * the physical address is aligned by a huge page size (1GB or 2MB) and 166 * the requested size is at least the huge page size. 167 * 168 * NOTE: MTRRs can override PAT memory types with a 4KB granularity. 169 * Therefore, the mapping code falls back to use a smaller page toward 4KB 170 * when a mapping range is covered by non-WB type of MTRRs. 171 * 172 * NOTE! We need to allow non-page-aligned mappings too: we will obviously 173 * have to convert them into an offset in a page-aligned mapping, but the 174 * caller shouldn't need to know that small detail. 175 */ 176 static void __iomem * 177 __ioremap_caller(resource_size_t phys_addr, unsigned long size, 178 enum page_cache_mode pcm, void *caller, bool encrypted) 179 { 180 unsigned long offset, vaddr; 181 resource_size_t last_addr; 182 const resource_size_t unaligned_phys_addr = phys_addr; 183 const unsigned long unaligned_size = size; 184 struct ioremap_desc io_desc; 185 struct vm_struct *area; 186 enum page_cache_mode new_pcm; 187 pgprot_t prot; 188 int retval; 189 void __iomem *ret_addr; 190 191 /* Don't allow wraparound or zero size */ 192 last_addr = phys_addr + size - 1; 193 if (!size || last_addr < phys_addr) 194 return NULL; 195 196 if (!phys_addr_valid(phys_addr)) { 197 printk(KERN_WARNING "ioremap: invalid physical address %llx\n", 198 (unsigned long long)phys_addr); 199 WARN_ON_ONCE(1); 200 return NULL; 201 } 202 203 __ioremap_check_mem(phys_addr, size, &io_desc); 204 205 /* 206 * Don't allow anybody to remap normal RAM that we're using.. 207 */ 208 if (io_desc.flags & IORES_MAP_SYSTEM_RAM) { 209 WARN_ONCE(1, "ioremap on RAM at %pa - %pa\n", 210 &phys_addr, &last_addr); 211 return NULL; 212 } 213 214 /* 215 * Mappings have to be page-aligned 216 */ 217 offset = phys_addr & ~PAGE_MASK; 218 phys_addr &= PHYSICAL_PAGE_MASK; 219 size = PAGE_ALIGN(last_addr+1) - phys_addr; 220 221 retval = memtype_reserve(phys_addr, (u64)phys_addr + size, 222 pcm, &new_pcm); 223 if (retval) { 224 printk(KERN_ERR "ioremap memtype_reserve failed %d\n", retval); 225 return NULL; 226 } 227 228 if (pcm != new_pcm) { 229 if (!is_new_memtype_allowed(phys_addr, size, pcm, new_pcm)) { 230 printk(KERN_ERR 231 "ioremap error for 0x%llx-0x%llx, requested 0x%x, got 0x%x\n", 232 (unsigned long long)phys_addr, 233 (unsigned long long)(phys_addr + size), 234 pcm, new_pcm); 235 goto err_free_memtype; 236 } 237 pcm = new_pcm; 238 } 239 240 /* 241 * If the page being mapped is in memory and SEV is active then 242 * make sure the memory encryption attribute is enabled in the 243 * resulting mapping. 244 */ 245 prot = PAGE_KERNEL_IO; 246 if ((io_desc.flags & IORES_MAP_ENCRYPTED) || encrypted) 247 prot = pgprot_encrypted(prot); 248 else if (prot_guest_has(PR_GUEST_SHARED_MAPPING_INIT)) 250 251 switch (pcm) { 252 case _PAGE_CACHE_MODE_UC: 253 default: 254 prot = __pgprot(pgprot_val(prot) | 255 cachemode2protval(_PAGE_CACHE_MODE_UC)); 256 break; 257 case _PAGE_CACHE_MODE_UC_MINUS: 258 prot = __pgprot(pgprot_val(prot) | 259 cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS)); 260 break; 261 case _PAGE_CACHE_MODE_WC: 262 prot = __pgprot(pgprot_val(prot) | 263 cachemode2protval(_PAGE_CACHE_MODE_WC)); 264 break; 265 case _PAGE_CACHE_MODE_WT: 266 prot = __pgprot(pgprot_val(prot) | 267 cachemode2protval(_PAGE_CACHE_MODE_WT)); 268 break; 269 case _PAGE_CACHE_MODE_WB: 270 break; 271 } 272 273 /* 274 * Ok, go for it.. 275 */ 276 area = get_vm_area_caller(size, VM_IOREMAP, caller); 277 if (!area) 278 goto err_free_memtype; 279 area->phys_addr = phys_addr; 280 vaddr = (unsigned long) area->addr; 281 282 if (memtype_kernel_map_sync(phys_addr, size, pcm)) 283 goto err_free_area; 284 285 if (ioremap_page_range(vaddr, vaddr + size, phys_addr, prot)) 286 goto err_free_area; 287 288 ret_addr = (void __iomem *) (vaddr + offset); 289 mmiotrace_ioremap(unaligned_phys_addr, unaligned_size, ret_addr); 290 291 /* 292 * Check if the request spans more than any BAR in the iomem resource 293 * tree. 294 */ 295 if (iomem_map_sanity_check(unaligned_phys_addr, unaligned_size)) 296 pr_warn("caller %pS mapping multiple BARs\n", caller); 297 298 return ret_addr; 299 err_free_area: 300 free_vm_area(area); 301 err_free_memtype: 302 memtype_free(phys_addr, phys_addr + size); 303 return NULL; 304 } 305 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org