linux-kernel - [intel-tdx:guest 104/126] drivers/firmware/efi/libstub/x86-stub.c:646:50: sparse: sparse: non size-preserving pointer to integer cast

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Date:   Fri, 1 Oct 2021 18:12:56 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Subject: [intel-tdx:guest 104/126]
 drivers/firmware/efi/libstub/x86-stub.c:646:50: sparse: sparse: non
 size-preserving pointer to integer cast

tree:   https://github.com/intel/tdx.git guest
head:   00e7708dd946e76b7a5e973162ae71111ca32aea
commit: c2b1173a3ae221b105ef9302dbd370389120d346 [104/126] efi/x86: Implement support for unaccepted memory
config: i386-randconfig-s001-20211001 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://github.com/intel/tdx/commit/c2b1173a3ae221b105ef9302dbd370389120d346
        git remote add intel-tdx https://github.com/intel/tdx.git
        git fetch --no-tags intel-tdx guest
        git checkout c2b1173a3ae221b105ef9302dbd370389120d346
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' 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@...el.com>


sparse warnings: (new ones prefixed by >>)
>> drivers/firmware/efi/libstub/x86-stub.c:646:50: sparse: sparse: non size-preserving pointer to integer cast

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);
 > 646			params->unaccepted_memory = (u64)unaccepted_memory;
   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

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