Hi Joerg,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on v5.8-rc5]
[cannot apply to tip/x86/core kvm/linux-next tip/x86/mm next-20200714]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use  as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Joerg-Roedel/x86-SEV-ES-Guest-Support/20200714-202150
base:    11ba468877bb23f28956a35e896356252d63c983
config: x86_64-randconfig-s021-20200714 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-14) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-41-g14e84ffc-dirty
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 

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

All error/warnings (new ones prefixed by >>):

   In file included from arch/x86/boot/compressed/sev-es.c:122:
   arch/x86/boot/compressed/../../kernel/sev-es-shared.c: In function 'sev_es_check_cpu_features':
>> arch/x86/boot/compressed/../../kernel/sev-es-shared.c:19:7: warning: implicit declaration of function 'has_cpuflag' [-Wimplicit-function-declaration]
      19 |  if (!has_cpuflag(X86_FEATURE_RDRAND)) {
         |       ^~~~~~~~~~~
--
   ld: arch/x86/boot/compressed/sev-es.o: in function `sev_es_shutdown_ghcb':
>> sev-es.c:(.text+0xf66): undefined reference to `has_cpuflag'

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