tree:   https://github.com/intel/tdx.git guest
head:   e7490da06ee4b49b02a0b8c0580a068539264044
commit: 52196bf062003d2f8073cbc0998f4a248d9e29a7 [90/110] x86/tdx: Make RDRAND/RDSEED loop forever
config: x86_64-randconfig-a006-20210809 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel/tdx/commit/52196bf062003d2f8073cbc0998f4a248d9e29a7
        git remote add intel-tdx https://github.com/intel/tdx.git
        git fetch --no-tags intel-tdx guest
        git checkout 52196bf062003d2f8073cbc0998f4a248d9e29a7
        # save the attached .config to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

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 >>):

   ld: arch/x86/boot/compressed/kaslr.o: in function `kaslr_get_random_long':
>> kaslr.c:(.text+0x2ec): undefined reference to `amd_prot_guest_has'
   ld: arch/x86/boot/compressed/vmlinux: hidden symbol `amd_prot_guest_has' isn't defined
   ld: final link failed: bad value

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