linux-kernel - Re: [PATCH v3] x86/speculation/l1tf: Add KConfig for setting the L1D cache flush mode

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Date:   Fri, 3 Jul 2020 22:14:26 +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, 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 v3] 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-20200703]
[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/20200703-061509
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 7e44a91e0445a854af5d34ca0f5baceccd518e73
config: i386-randconfig-a004-20200701 (attached as .config)
compiler: gcc-6 (Debian 6.3.0-18+deb9u1) 6.3.0 20170516
reproduce (this is a W=1 build):
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

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 [-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 [-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 [-Wundef]
    #elif (CONFIG_KVM_VMENTRY_L1D_FLUSH == 3)
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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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