linux-kernel - vmlinux.o: warning: objtool: __svm_sev_es_vcpu_run()+0x54: BP used as a scratch register

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Date:   Wed, 17 Nov 2021 20:41:31 +0800
From:   kernel test robot <lkp@...el.com>
To:     Tom Lendacky <thomas.lendacky@....com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: vmlinux.o: warning: objtool: __svm_sev_es_vcpu_run()+0x54: BP used
 as a scratch register

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   8ab774587903771821b59471cc723bba6d893942
commit: 16809ecdc1e8ab7278f1d60021ac809edd17d060 KVM: SVM: Provide an updated VMRUN invocation for SEV-ES guests
date:   11 months ago
config: x86_64-buildonly-randconfig-r005-20211117 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=16809ecdc1e8ab7278f1d60021ac809edd17d060
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 16809ecdc1e8ab7278f1d60021ac809edd17d060
        # 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@...el.com>

All warnings (new ones prefixed by >>):

   vmlinux.o: warning: objtool: __do_fast_syscall_32()+0x3d: call to syscall_enter_from_user_mode_work() leaves .noinstr.text section
   vmlinux.o: warning: objtool: __svm_vcpu_run()+0x10e: BP used as a scratch register
>> vmlinux.o: warning: objtool: __svm_sev_es_vcpu_run()+0x54: BP used as a scratch register
   vmlinux.o: warning: objtool: do_machine_check()+0x93c: call to mce_panic.isra.0() leaves .noinstr.text section
   vmlinux.o: warning: objtool: match_held_lock()+0xcd: call to rcu_read_lock_any_held() leaves .noinstr.text section
   vmlinux.o: warning: objtool: lock_is_held_type()+0x67: call to check_flags.part.0() leaves .noinstr.text section

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

Download attachment ".config.gz" of type "application/gzip" (28068 bytes)