tree: https://github.com/intel/tdx.git guest head: 41fe88a1b3c28543f49fa6ed9e0e9b6650ed7614 commit: 102129224696b1fd61f13fc1493fd922cd281448 [112/144] efi/x86: Implement support for unaccepted memory config: i386-randconfig-a003-20211207 (https://download.01.org/0day-ci/archive/20211208/202112081509.OILzXDqW-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/intel/tdx/commit/102129224696b1fd61f13fc1493fd922cd281448 git remote add intel-tdx https://github.com/intel/tdx.git git fetch --no-tags intel-tdx guest git checkout 102129224696b1fd61f13fc1493fd922cd281448 # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/firmware/efi/libstub/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): drivers/firmware/efi/libstub/x86-stub.c: In function 'allocate_e820': 646 | params->unaccepted_memory = (u64)unaccepted_memory; | ^ vim +646 drivers/firmware/efi/libstub/x86-stub.c 579 580 static efi_status_t allocate_e820(struct boot_params *params, 581 struct efi_boot_memmap *map, 582 struct setup_data **e820ext, 583 u32 *e820ext_size) 584 { 585 efi_status_t status; 586 __u32 nr_desc; 587 bool unaccepted_memory_present = false; 588 u64 max_addr = 0; 589 int i; 590 591 status = efi_get_memory_map(map); 592 if (status != EFI_SUCCESS) 593 return status; 594 595 nr_desc = *map->map_size / *map->desc_size; 596 if (nr_desc > ARRAY_SIZE(params->e820_table) - EFI_MMAP_NR_SLACK_SLOTS) { 597 u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table) + 598 EFI_MMAP_NR_SLACK_SLOTS; 599 600 status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size); 601 if (status != EFI_SUCCESS) 602 goto out; 603 } 604 605 if (!IS_ENABLED(CONFIG_UNACCEPTED_MEMORY)) 606 goto out; 607 608 /* Check if there's any unaccepted memory and find the max address */ 609 for (i = 0; i < nr_desc; i++) { 610 efi_memory_desc_t *d; 611 612 d = efi_early_memdesc_ptr(*map->map, *map->desc_size, i); 613 if (d->type == EFI_UNACCEPTED_MEMORY) 614 unaccepted_memory_present = true; 615 if (d->phys_addr + d->num_pages * PAGE_SIZE > max_addr) 616 max_addr = d->phys_addr + d->num_pages * PAGE_SIZE; 617 } 618 619 /* 620 * If unaccepted memory present allocate a bitmap to track what memory 621 * has to be accepted before access. 622 * 623 * One bit in the bitmap represents 2MiB in the address space: one 4k 624 * page is enough to track 64GiB or physical address space. 625 * 626 * In the worst case scenario -- a huge hole in the middle of the 627 * address space -- It needs 256MiB to handle 4PiB of the address 628 * space. 629 * 630 * TODO: handle situation if params->unaccepted_memory has already set. 631 * It's required to deal with kexec. 632 * 633 * The bitmap will be populated in setup_e820() according to the memory 634 * map after efi_exit_boot_services(). 635 */ 636 if (unaccepted_memory_present) { 637 unsigned long *unaccepted_memory = NULL; 638 u64 size = DIV_ROUND_UP(max_addr, PMD_SIZE * BITS_PER_BYTE); 639 640 status = efi_allocate_pages(size, 641 (unsigned long *)&unaccepted_memory, 642 ULONG_MAX); 643 if (status != EFI_SUCCESS) 644 goto out; 645 memset(unaccepted_memory, 0, size); 647 } 648 649 out: 650 efi_bs_call(free_pool, *map->map); 651 return status; 652 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org