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

kernel test robot
2020-07-03T06:53:25Z

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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: i386-randconfig-s002-20200702 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-14) 9.3.0
reproduce:
# apt-get install sparse
# sparse version: v0.6.2-3-gfa153962-dirty
# save the attached .config to linux build tree
make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386

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

sparse warnings: (new ones prefixed by >>)

>> arch/x86/kernel/cpu/bugs.c:1402:6: sparse: sparse: undefined preprocessor identifier 'CONFIG_KVM_VMENTRY_L1D_FLUSH'
arch/x86/kernel/cpu/bugs.c:1404:8: sparse: sparse: undefined preprocessor identifier 'CONFIG_KVM_VMENTRY_L1D_FLUSH'
arch/x86/kernel/cpu/bugs.c:1406:8: sparse: sparse: undefined preprocessor identifier 'CONFIG_KVM_VMENTRY_L1D_FLUSH'

# https://github.com/0day-ci/linux/commit/893761b6e087104d84679082e5dfb90d41fd2878
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout 893761b6e087104d84679082e5dfb90d41fd2878
vim +/CONFIG_KVM_VMENTRY_L1D_FLUSH +1402 arch/x86/kernel/cpu/bugs.c

72c6d2db64fa18c Thomas Gleixner 2018-07-13 1396
d90a7a0ec83fb86 Jiri Kosina 2018-07-13 1397 /* Default mitigation for L1TF-affected CPUs */
d90a7a0ec83fb86 Jiri Kosina 2018-07-13 1398 enum l1tf_mitigations l1tf_mitigation __ro_after_init = L1TF_MITIGATION_FLUSH;
72c6d2db64fa18c Thomas Gleixner 2018-07-13 1399 #if IS_ENABLED(CONFIG_KVM_INTEL)
d90a7a0ec83fb86 Jiri Kosina 2018-07-13 1400 EXPORT_SYMBOL_GPL(l1tf_mitigation);
1eb46908b35dfba Guenter Roeck 2018-08-15 1401 #endif
893761b6e087104 Abhishek Bhardwaj 2020-07-02 @1402 #if (CONFIG_KVM_VMENTRY_L1D_FLUSH == 1)
893761b6e087104 Abhishek Bhardwaj 2020-07-02 1403 enum vmx_l1d_flush_state l1tf_vmx_mitigation = VMENTER_L1D_FLUSH_NEVER;
893761b6e087104 Abhishek Bhardwaj 2020-07-02 1404 #elif (CONFIG_KVM_VMENTRY_L1D_FLUSH == 2)
893761b6e087104 Abhishek Bhardwaj 2020-07-02 1405 enum vmx_l1d_flush_state l1tf_vmx_mitigation = VMENTER_L1D_FLUSH_COND;
893761b6e087104 Abhishek Bhardwaj 2020-07-02 1406 #elif (CONFIG_KVM_VMENTRY_L1D_FLUSH == 3)
893761b6e087104 Abhishek Bhardwaj 2020-07-02 1407 enum vmx_l1d_flush_state l1tf_vmx_mitigation = VMENTER_L1D_FLUSH_ALWAYS;
893761b6e087104 Abhishek Bhardwaj 2020-07-02 1408 #else
895ae47f9918833 Thomas Gleixner 2018-07-13 1409 enum vmx_l1d_flush_state l1tf_vmx_mitigation = VMENTER_L1D_FLUSH_AUTO;
893761b6e087104 Abhishek Bhardwaj 2020-07-02 1410 #endif
72c6d2db64fa18c Thomas Gleixner 2018-07-13 1411 EXPORT_SYMBOL_GPL(l1tf_vmx_mitigation);
72c6d2db64fa18c Thomas Gleixner 2018-07-13 1412

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

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