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

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Date:   Fri, 3 Jul 2020 05:33:01 +0800
From:   kernel test robot <lkp@...el.com>
To:     Abhishek Bhardwaj <abhishekbh@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        Abhishek Bhardwaj <abhishekbh@...gle.com>,
        Anthony Steinhauser <asteinhauser@...gle.com>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Mark Gross <mgross@...ux.intel.com>
Subject: Re: [PATCH] x86/speculation/l1tf: Add KConfig for setting the L1D
 cache flush mode

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@...el.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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