Re: [PATCH v4 6/7] x86/jailhouse: Allow to use PCI_MMCONFIG without ACPI

[kbuild test robot]

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>

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