Re: [PATCH v8 15/15] x86: EFI stub DRTM launch support for Secure Launch

[kernel test robot <lkp@intel.com>]

Hi Ross,

kernel test robot noticed the following build errors:

[auto build test ERROR on char-misc/char-misc-testing]
[also build test ERROR on char-misc/char-misc-next char-misc/char-misc-linus herbert-cryptodev-2.6/master herbert-crypto-2.6/master linus/master v6.8-rc4 next-20240216]
[cannot apply to tip/x86/core]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Ross-Philipson/x86-boot-Place-kernel_info-at-a-fixed-offset/20240215-064712
base:   char-misc/char-misc-testing
patch link:    https://lore.kernel.org/r/20240214221847.2066632-16-ross.philipson%40oracle.com
patch subject: [PATCH v8 15/15] x86: EFI stub DRTM launch support for Secure Launch
config: i386-allmodconfig (https://download.01.org/0day-ci/archive/20240218/202402180324.a3PqEegg-lkp@intel.com/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/20240218/202402180324.a3PqEegg-lkp@intel.com/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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202402180324.a3PqEegg-lkp@intel.com/

All errors (new ones prefixed by >>):

   In function 'efi_secure_launch',
       inlined from 'efi_stub_entry' at drivers/firmware/efi/libstub/x86-stub.c:990:2:
>> drivers/firmware/efi/libstub/x86-stub.c:861:9: error: inconsistent operand constraints in an 'asm'
     861 |         asm volatile ("jmp *%%rax"
         |         ^~~


vim +/asm +861 drivers/firmware/efi/libstub/x86-stub.c

   813	
   814	static void efi_secure_launch(struct boot_params *boot_params)
   815	{
   816		struct slr_entry_uefi_config *uefi_config;
   817		struct slr_uefi_cfg_entry *uefi_entry;
   818		struct slr_entry_dl_info *dlinfo;
   819		efi_guid_t guid = SLR_TABLE_GUID;
   820		struct slr_table *slrt;
   821		u64 memmap_hi;
   822		void *table;
   823		u8 buf[64] = {0};
   824	
   825		table = get_efi_config_table(guid);
   826	
   827		/*
   828		 * The presence of this table indicated a Secure Launch
   829		 * is being requested.
   830		 */
   831		if (!table)
   832			return;
   833	
   834		slrt = (struct slr_table *)table;
   835	
   836		if (slrt->magic != SLR_TABLE_MAGIC)
   837			return;
   838	
   839		/* Add config information to measure the UEFI memory map */
   840		uefi_config = (struct slr_entry_uefi_config *)buf;
   841		uefi_config->hdr.tag = SLR_ENTRY_UEFI_CONFIG;
   842		uefi_config->hdr.size = sizeof(*uefi_config) + sizeof(*uefi_entry);
   843		uefi_config->revision = SLR_UEFI_CONFIG_REVISION;
   844		uefi_config->nr_entries = 1;
   845		uefi_entry = (struct slr_uefi_cfg_entry *)(buf + sizeof(*uefi_config));
   846		uefi_entry->pcr = 18;
   847		uefi_entry->cfg = boot_params->efi_info.efi_memmap;
   848		memmap_hi = boot_params->efi_info.efi_memmap_hi;
   849		uefi_entry->cfg |= memmap_hi << 32;
   850		uefi_entry->size = boot_params->efi_info.efi_memmap_size;
   851		memcpy(&uefi_entry->evt_info[0], "Measured UEFI memory map",
   852			strlen("Measured UEFI memory map"));
   853	
   854		if (slr_add_entry(slrt, (struct slr_entry_hdr *)uefi_config))
   855			return;
   856	
   857		/* Jump through DL stub to initiate Secure Launch */
   858		dlinfo = (struct slr_entry_dl_info *)
   859			slr_next_entry_by_tag(slrt, NULL, SLR_ENTRY_DL_INFO);
   860	
 > 861		asm volatile ("jmp *%%rax"
   862			      : : "a" (dlinfo->dl_handler), "D" (&dlinfo->bl_context));
   863	}
   864	

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