Re: [PATCH] x86/speculation/l1tf: Add KConfig for setting the L1D cache flush mode

kernel test robot
2020-07-02T21:33:49Z

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Hi Abhishek,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on tip/auto-latest]
[also build test WARNING on linux/master tip/x86/core kvm/linux-next linus/master v5.8-rc3 next-20200702]
[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/Abhishek-Bhardwaj/x86-speculation-l1tf-Add-KConfig-for-setting-the-L1D-cache-flush-mode/20200703-002135
base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 7e44a91e0445a854af5d34ca0f5baceccd518e73
config: x86_64-defconfig (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 003a086ffc0d1affbb8300b36225fb8150a2d40a)
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
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64

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

All warnings (new ones prefixed by >>):

>> arch/x86/kernel/cpu/bugs.c:1402:6: warning: 'CONFIG_KVM_VMENTRY_L1D_FLUSH' is not defined, evaluates to 0 [-Wundef]
#if (CONFIG_KVM_VMENTRY_L1D_FLUSH == 1)
^
arch/x86/kernel/cpu/bugs.c:1404:8: warning: 'CONFIG_KVM_VMENTRY_L1D_FLUSH' is not defined, evaluates to 0 [-Wundef]
#elif (CONFIG_KVM_VMENTRY_L1D_FLUSH == 2)
^
arch/x86/kernel/cpu/bugs.c:1406:8: warning: 'CONFIG_KVM_VMENTRY_L1D_FLUSH' is not defined, evaluates to 0 [-Wundef]
#elif (CONFIG_KVM_VMENTRY_L1D_FLUSH == 3)
^
3 warnings generated.

vim +/CONFIG_KVM_VMENTRY_L1D_FLUSH +1402 arch/x86/kernel/cpu/bugs.c

1396
1397 /* Default mitigation for L1TF-affected CPUs */
1398 enum l1tf_mitigations l1tf_mitigation __ro_after_init = L1TF_MITIGATION_FLUSH;
1399 #if IS_ENABLED(CONFIG_KVM_INTEL)
1400 EXPORT_SYMBOL_GPL(l1tf_mitigation);
1401 #endif
> 1402 #if (CONFIG_KVM_VMENTRY_L1D_FLUSH == 1)
1403 enum vmx_l1d_flush_state l1tf_vmx_mitigation = VMENTER_L1D_FLUSH_NEVER;
1404 #elif (CONFIG_KVM_VMENTRY_L1D_FLUSH == 2)
1405 enum vmx_l1d_flush_state l1tf_vmx_mitigation = VMENTER_L1D_FLUSH_COND;
1406 #elif (CONFIG_KVM_VMENTRY_L1D_FLUSH == 3)
1407 enum vmx_l1d_flush_state l1tf_vmx_mitigation = VMENTER_L1D_FLUSH_ALWAYS;
1408 #else
1409 enum vmx_l1d_flush_state l1tf_vmx_mitigation = VMENTER_L1D_FLUSH_AUTO;
1410 #endif
1411 EXPORT_SYMBOL_GPL(l1tf_vmx_mitigation);
1412

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

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