Re: [PATCH 3/3] KVM: x86: Don't deflect MSRs to userspace that can't be filtered

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

Hi Aaron,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on kvm/queue]
[also build test WARNING on next-20220701]
[cannot apply to mst-vhost/linux-next linus/master v5.19-rc4]
[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]

url:    https://github.com/intel-lab-lkp/linux/commits/Aaron-Lewis/MSR-Filtering-updates/20220704-031727
base:   https://git.kernel.org/pub/scm/virt/kvm/kvm.git queue
config: i386-randconfig-a011 (https://download.01.org/0day-ci/archive/20220704/202207040448.69LBG38o-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 5d787689b14574fe58ba9798563f4a6df6059fbf)
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
        # https://github.com/intel-lab-lkp/linux/commit/0c12a0d47fb511592df45bf2030cc200b5bab5ef
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Aaron-Lewis/MSR-Filtering-updates/20220704-031727
        git checkout 0c12a0d47fb511592df45bf2030cc200b5bab5ef
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/kvm/

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

All warnings (new ones prefixed by >>):

>> arch/x86/kvm/x86.c:1715:6: warning: no previous prototype for function 'kvm_msr_filtering_disallowed' [-Wmissing-prototypes]
   bool kvm_msr_filtering_disallowed(u32 index)
        ^
   arch/x86/kvm/x86.c:1715:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   bool kvm_msr_filtering_disallowed(u32 index)
   ^
   static 
   1 warning generated.


vim +/kvm_msr_filtering_disallowed +1715 arch/x86/kvm/x86.c

  1714	
> 1715	bool kvm_msr_filtering_disallowed(u32 index)
  1716	{
  1717		/* x2APIC MSRs do not support filtering. */
  1718		if (index >= 0x800 && index <= 0x8ff)
  1719			return true;
  1720	
  1721		return false;
  1722	}
  1723	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp