Hi Jan, I love your patch! Yet something to improve: [auto build test ERROR on pci/next] [also build test ERROR on v4.16-rc4 next-20180305] [cannot apply to tip/x86/core] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Jan-Kiszka/jailhouse-Enhance-secondary-Jailhouse-guest-support-wrt-PCI/20180306-070138 base: https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git next config: i386-randconfig-x079-201809 (attached as .config) compiler: gcc-7 (Debian 7.3.0-1) 7.3.0 reproduce: # save the attached .config to linux build tree make ARCH=i386 All errors (new ones prefixed by >>): arch/x86/kernel/cpu/amd.c: In function 'init_amd_gh': >> arch/x86/kernel/cpu/amd.c:722:3: error: implicit declaration of function 'check_enable_amd_mmconf_dmi' [-Werror=implicit-function-declaration] check_enable_amd_mmconf_dmi(); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ >> arch/x86/kernel/cpu/amd.c:724:2: error: implicit declaration of function 'fam10h_check_enable_mmcfg' [-Werror=implicit-function-declaration] fam10h_check_enable_mmcfg(); ^~~~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/check_enable_amd_mmconf_dmi +722 arch/x86/kernel/cpu/amd.c 0d96b9ff7 Yinghai Lu 2009-08-29 716 26bfa5f89 Borislav Petkov 2014-06-24 717 static void init_amd_gh(struct cpuinfo_x86 *c) 26bfa5f89 Borislav Petkov 2014-06-24 718 { 377b0048c Jan Kiszka 2018-03-04 719 #ifdef CONFIG_MMCONF_FAM10H 26bfa5f89 Borislav Petkov 2014-06-24 720 /* do this for boot cpu */ 26bfa5f89 Borislav Petkov 2014-06-24 721 if (c == &boot_cpu_data) 26bfa5f89 Borislav Petkov 2014-06-24 @722 check_enable_amd_mmconf_dmi(); 26bfa5f89 Borislav Petkov 2014-06-24 723 26bfa5f89 Borislav Petkov 2014-06-24 @724 fam10h_check_enable_mmcfg(); 26bfa5f89 Borislav Petkov 2014-06-24 725 #endif 6c62aa4a3 Yinghai Lu 2008-09-07 726 6c62aa4a3 Yinghai Lu 2008-09-07 727 /* 26bfa5f89 Borislav Petkov 2014-06-24 728 * Disable GART TLB Walk Errors on Fam10h. We do this here because this 26bfa5f89 Borislav Petkov 2014-06-24 729 * is always needed when GART is enabled, even in a kernel which has no 26bfa5f89 Borislav Petkov 2014-06-24 730 * MCE support built in. BIOS should disable GartTlbWlk Errors already. 26bfa5f89 Borislav Petkov 2014-06-24 731 * If it doesn't, we do it here as suggested by the BKDG. 26bfa5f89 Borislav Petkov 2014-06-24 732 * 26bfa5f89 Borislav Petkov 2014-06-24 733 * Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=33012 6c62aa4a3 Yinghai Lu 2008-09-07 734 */ 26bfa5f89 Borislav Petkov 2014-06-24 735 msr_set_bit(MSR_AMD64_MCx_MASK(4), 10); 6c62aa4a3 Yinghai Lu 2008-09-07 736 26bfa5f89 Borislav Petkov 2014-06-24 737 /* 26bfa5f89 Borislav Petkov 2014-06-24 738 * On family 10h BIOS may not have properly enabled WC+ support, causing 26bfa5f89 Borislav Petkov 2014-06-24 739 * it to be converted to CD memtype. This may result in performance 26bfa5f89 Borislav Petkov 2014-06-24 740 * degradation for certain nested-paging guests. Prevent this conversion 26bfa5f89 Borislav Petkov 2014-06-24 741 * by clearing bit 24 in MSR_AMD64_BU_CFG2. 26bfa5f89 Borislav Petkov 2014-06-24 742 * 26bfa5f89 Borislav Petkov 2014-06-24 743 * NOTE: we want to use the _safe accessors so as not to #GP kvm 26bfa5f89 Borislav Petkov 2014-06-24 744 * guests on older kvm hosts. 26bfa5f89 Borislav Petkov 2014-06-24 745 */ 26bfa5f89 Borislav Petkov 2014-06-24 746 msr_clear_bit(MSR_AMD64_BU_CFG2, 24); 11fdd252b Yinghai Lu 2008-09-07 747 26bfa5f89 Borislav Petkov 2014-06-24 748 if (cpu_has_amd_erratum(c, amd_erratum_383)) 26bfa5f89 Borislav Petkov 2014-06-24 749 set_cpu_bug(c, X86_BUG_AMD_TLB_MMATCH); 11fdd252b Yinghai Lu 2008-09-07 750 } 11fdd252b Yinghai Lu 2008-09-07 751 :::::: The code at line 722 was first introduced by commit :::::: 26bfa5f89486a8926cd4d4ca81a04d3f0f174934 x86, amd: Cleanup init_amd :::::: TO: Borislav Petkov <bp@xxxxxxx> :::::: CC: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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