linux-kernel - Re: [PATCH v7 05/15] KVM: vmx/pmu: Emulate MSR_ARCH_LBR

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Message-ID: <202108070018.no0jw299-lkp@intel.com>
Date:   Sat, 7 Aug 2021 00:26:42 +0800
From:   kernel test robot <lkp@...el.com>
To:     Yang Weijiang <weijiang.yang@...el.com>, pbonzini@...hat.com,
        jmattson@...gle.com, seanjc@...gle.com, vkuznets@...hat.com,
        wei.w.wang@...el.com, like.xu.linux@...il.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     kbuild-all@...ts.01.org, Like Xu <like.xu@...ux.intel.com>,
        Yang Weijiang <weijiang.yang@...el.com>
Subject: Re: [PATCH v7 05/15] KVM: vmx/pmu: Emulate MSR_ARCH_LBR_CTL for
 guest Arch LBR

Hi Yang,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on v5.14-rc4]
[also build test WARNING on next-20210805]
[cannot apply to kvm/queue tip/perf/core tip/x86/core]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Yang-Weijiang/Introduce-Architectural-LBR-for-vPMU/20210806-153154
base:    c500bee1c5b2f1d59b1081ac879d73268ab0ff17
config: x86_64-rhel-8.3-kselftests (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-348-gf0e6938b-dirty
        # https://github.com/0day-ci/linux/commit/1d5b4967a3c4553c3648638f1189dcbff631328e
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Yang-Weijiang/Introduce-Architectural-LBR-for-vPMU/20210806-153154
        git checkout 1d5b4967a3c4553c3648638f1189dcbff631328e
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/kvm/

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


sparse warnings: (new ones prefixed by >>)
   arch/x86/kvm/vmx/pmu_intel.c: note: in included file (through arch/x86/kvm/vmx/vmx_ops.h, arch/x86/kvm/vmx/vmx.h, arch/x86/kvm/vmx/nested.h):
>> arch/x86/kvm/vmx/evmcs.h:81:30: sparse: sparse: cast truncates bits from constant value (a058a becomes 58a)
>> arch/x86/kvm/vmx/evmcs.h:81:30: sparse: sparse: cast truncates bits from constant value (a058a becomes 58a)
   arch/x86/kvm/vmx/evmcs.h:81:30: sparse: sparse: cast truncates bits from constant value (a008a becomes 8a)
   arch/x86/kvm/vmx/evmcs.h:81:30: sparse: sparse: cast truncates bits from constant value (a008a becomes 8a)
   arch/x86/kvm/vmx/evmcs.h:81:30: sparse: sparse: cast truncates bits from constant value (a008a becomes 8a)

vim +81 arch/x86/kvm/vmx/evmcs.h

75edce8a45486f arch/x86/kvm/vmx/evmcs.h Sean Christopherson 2018-12-03  77  
773e8a0425c923 arch/x86/kvm/vmx_evmcs.h Vitaly Kuznetsov    2018-03-20  78  static __always_inline int get_evmcs_offset(unsigned long field,
773e8a0425c923 arch/x86/kvm/vmx_evmcs.h Vitaly Kuznetsov    2018-03-20  79  					    u16 *clean_field)
773e8a0425c923 arch/x86/kvm/vmx_evmcs.h Vitaly Kuznetsov    2018-03-20  80  {
773e8a0425c923 arch/x86/kvm/vmx_evmcs.h Vitaly Kuznetsov    2018-03-20 @81  	unsigned int index = ROL16(field, 6);
773e8a0425c923 arch/x86/kvm/vmx_evmcs.h Vitaly Kuznetsov    2018-03-20  82  	const struct evmcs_field *evmcs_field;
773e8a0425c923 arch/x86/kvm/vmx_evmcs.h Vitaly Kuznetsov    2018-03-20  83  
75edce8a45486f arch/x86/kvm/vmx/evmcs.h Sean Christopherson 2018-12-03  84  	if (unlikely(index >= nr_evmcs_1_fields)) {
773e8a0425c923 arch/x86/kvm/vmx_evmcs.h Vitaly Kuznetsov    2018-03-20  85  		WARN_ONCE(1, "KVM: accessing unsupported EVMCS field %lx\n",
773e8a0425c923 arch/x86/kvm/vmx_evmcs.h Vitaly Kuznetsov    2018-03-20  86  			  field);
773e8a0425c923 arch/x86/kvm/vmx_evmcs.h Vitaly Kuznetsov    2018-03-20  87  		return -ENOENT;
773e8a0425c923 arch/x86/kvm/vmx_evmcs.h Vitaly Kuznetsov    2018-03-20  88  	}
773e8a0425c923 arch/x86/kvm/vmx_evmcs.h Vitaly Kuznetsov    2018-03-20  89  
773e8a0425c923 arch/x86/kvm/vmx_evmcs.h Vitaly Kuznetsov    2018-03-20  90  	evmcs_field = &vmcs_field_to_evmcs_1[index];
773e8a0425c923 arch/x86/kvm/vmx_evmcs.h Vitaly Kuznetsov    2018-03-20  91  
773e8a0425c923 arch/x86/kvm/vmx_evmcs.h Vitaly Kuznetsov    2018-03-20  92  	if (clean_field)
773e8a0425c923 arch/x86/kvm/vmx_evmcs.h Vitaly Kuznetsov    2018-03-20  93  		*clean_field = evmcs_field->clean_field;
773e8a0425c923 arch/x86/kvm/vmx_evmcs.h Vitaly Kuznetsov    2018-03-20  94  
773e8a0425c923 arch/x86/kvm/vmx_evmcs.h Vitaly Kuznetsov    2018-03-20  95  	return evmcs_field->offset;
773e8a0425c923 arch/x86/kvm/vmx_evmcs.h Vitaly Kuznetsov    2018-03-20  96  }
773e8a0425c923 arch/x86/kvm/vmx_evmcs.h Vitaly Kuznetsov    2018-03-20  97  

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