[sashal-linux-stable:queue-5.11 26/181] arch/x86/boot/compressed/head_64.S:827: Error: can't resolve `sev_status' {*UND* section} - `startup_32' {.head.text section}

[sashal-linux-stable:queue-5.11 26/181] arch/x86/boot/compressed/head_64.S:827: Error: can't resolve `sev_status' {*UND* section} - `startup_32' {.head.text section}

[kernel test robot]

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Hi Nathan,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-5.11
head:   d7b2033a36371babdec3a95b8e81f0f951622c16
commit: dd9ef8b0199cfa44a14e285de8d9ba0b36514028 [26/181] x86/boot: Add $(CLANG_FLAGS) to compressed KBUILD_CFLAGS
config: x86_64-randconfig-r011-20210507 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project a3a8a1a15b524d91b5308db68e9d293b34cd88dd)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git/commit/?id=dd9ef8b0199cfa44a14e285de8d9ba0b36514028
        git remote add sashal-linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git
        git fetch --no-tags sashal-linux-stable queue-5.11
        git checkout dd9ef8b0199cfa44a14e285de8d9ba0b36514028
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   arch/x86/boot/compressed/head_64.S: Assembler messages:
>> arch/x86/boot/compressed/head_64.S:827: Error: can't resolve `sev_status' {*UND* section} - `startup_32' {.head.text section}
>> arch/x86/boot/compressed/head_64.S:842: Error: can't resolve `sev_check_data' {*UND* section} - `startup_32' {.head.text section}
   arch/x86/boot/compressed/head_64.S:843: Error: can't resolve `sev_check_data' {*UND* section} - `startup_32' {.head.text section}
   arch/x86/boot/compressed/head_64.S:850: Error: can't resolve `sev_check_data' {*UND* section} - `startup_32' {.head.text section}
   arch/x86/boot/compressed/head_64.S:852: Error: can't resolve `sev_check_data' {*UND* section} - `startup_32' {.head.text section}
   clang-13: error: assembler command failed with exit code 1 (use -v to see invocation)


vim +827 arch/x86/boot/compressed/head_64.S

b8ff87a6158886 Matt Fleming 2014-01-10  801  
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  802  /*
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  803   * Check for the correct C-bit position when the startup_32 boot-path is used.
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  804   *
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  805   * The check makes use of the fact that all memory is encrypted when paging is
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  806   * disabled. The function creates 64 bits of random data using the RDRAND
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  807   * instruction. RDRAND is mandatory for SEV guests, so always available. If the
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  808   * hypervisor violates that the kernel will crash right here.
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  809   *
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  810   * The 64 bits of random data are stored to a memory location and at the same
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  811   * time kept in the %eax and %ebx registers. Since encryption is always active
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  812   * when paging is off the random data will be stored encrypted in main memory.
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  813   *
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  814   * Then paging is enabled. When the C-bit position is correct all memory is
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  815   * still mapped encrypted and comparing the register values with memory will
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  816   * succeed. An incorrect C-bit position will map all memory unencrypted, so that
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  817   * the compare will use the encrypted random data and fail.
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  818   */
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  819  SYM_FUNC_START(startup32_check_sev_cbit)
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  820  #ifdef CONFIG_AMD_MEM_ENCRYPT
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  821  	pushl	%eax
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  822  	pushl	%ebx
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  823  	pushl	%ecx
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  824  	pushl	%edx
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  825  
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  826  	/* Check for non-zero sev_status */
9bcb9b5cdb1165 Joerg Roedel 2021-03-12 @827  	movl	rva(sev_status)(%ebp), %eax
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  828  	testl	%eax, %eax
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  829  	jz	4f
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  830  
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  831  	/*
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  832  	 * Get two 32-bit random values - Don't bail out if RDRAND fails
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  833  	 * because it is better to prevent forward progress if no random value
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  834  	 * can be gathered.
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  835  	 */
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  836  1:	rdrand	%eax
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  837  	jnc	1b
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  838  2:	rdrand	%ebx
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  839  	jnc	2b
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  840  
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  841  	/* Store to memory and keep it in the registers */
9bcb9b5cdb1165 Joerg Roedel 2021-03-12 @842  	movl	%eax, rva(sev_check_data)(%ebp)
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  843  	movl	%ebx, rva(sev_check_data+4)(%ebp)
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  844  
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  845  	/* Enable paging to see if encryption is active */
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  846  	movl	%cr0, %edx			 /* Backup %cr0 in %edx */
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  847  	movl	$(X86_CR0_PG | X86_CR0_PE), %ecx /* Enable Paging and Protected mode */
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  848  	movl	%ecx, %cr0
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  849  
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  850  	cmpl	%eax, rva(sev_check_data)(%ebp)
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  851  	jne	3f
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  852  	cmpl	%ebx, rva(sev_check_data+4)(%ebp)
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  853  	jne	3f
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  854  
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  855  	movl	%edx, %cr0	/* Restore previous %cr0 */
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  856  
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  857  	jmp	4f
9bcb9b5cdb1165 Joerg Roedel 2021-03-12  858  

:::::: The code at line 827 was first introduced by commit
:::::: 9bcb9b5cdb1165b6dc9a2fc754ee3fc7fc8def76 x86/boot/compressed/64: Check SEV encryption in the 32-bit boot-path

:::::: TO: Joerg Roedel <jroedel@suse.de>
:::::: CC: Sasha Levin <sashal@kernel.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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