linux-kernel - RE: [KVM] 5fc3cfa62b: kernel-selftests.kvm.vmx_pmu_msrs

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Date:   Wed, 18 May 2022 01:41:18 +0000
From:   "Hao, Xudong" <xudong.hao@...el.com>
To:     "Sang, Oliver" <oliver.sang@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "lkp@...ts.01.org" <lkp@...ts.01.org>, lkp <lkp@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "Yang, Weijiang" <weijiang.yang@...el.com>
Subject: RE: [KVM]  5fc3cfa62b: kernel-selftests.kvm.vmx_pmu_msrs_test.fail

+Weijiang who submitted a fix patch.

> -----Original Message-----
> From: Sang, Oliver <oliver.sang@...el.com>
> Sent: Tuesday, May 17, 2022 9:17 PM
> To: Vitaly Kuznetsov <vkuznets@...hat.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>; lkp@...ts.01.org; lkp
> <lkp@...el.com>; Hao, Xudong <xudong.hao@...el.com>; LKML <linux-
> kernel@...r.kernel.org>
> Subject: [KVM] 5fc3cfa62b: kernel-selftests.kvm.vmx_pmu_msrs_test.fail
> 
> 
> 
> Greeting,
> 
> FYI, we noticed the following commit (built with gcc-11):
> 
> commit: 5fc3cfa62b85fb60d2383229791f755f333963ed ("KVM: x86: Drop guest
> CPUID check for host initiated writes to MSR_IA32_PERF_CAPABILITIES")
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable-rc.git linux-5.15.y
> 
> in testcase: kernel-selftests
> version: kernel-selftests-x86_64-a6eb654d-1_20220501
> with following parameters:
> 
> 	group: kvm
> 	ucode: 0xec
> 
> test-description: The kernel contains a set of "self tests" under the
> tools/testing/selftests/ directory. These are intended to be small unit tests to
> exercise individual code paths in the kernel.
> test-url: https://www.kernel.org/doc/Documentation/kselftest.txt
> 
> 
> on test machine: 4 threads Intel(R) Xeon(R) CPU E3-1225 v5 @ 3.30GHz with 16G
> memory
> 
> caused below changes (please refer to attached dmesg/kmsg for entire
> log/backtrace):
> 
> 
> 
> 
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <oliver.sang@...el.com>
> 
> 
> 
> # selftests: kvm: vmx_pmu_msrs_test
> # ==== Test Assertion Failure ====
> #   x86_64/vmx_pmu_msrs_test.c:117: ret == 0
> #   pid=10285 tid=10285 errno=0 - Success
> #      1	0x0000000000402643: main at vmx_pmu_msrs_test.c:117
> #      2	0x00007f8bb619309a: ?? ??:0
> #      3	0x0000000000402759: _start at ??:?
> #   Bad PERF_CAPABILITIES didn't fail.
> not ok 32 selftests: kvm: vmx_pmu_msrs_test # exit=254
> 
> 
> 
> To reproduce:
> 
>         git clone https://github.com/intel/lkp-tests.git
>         cd lkp-tests
>         sudo bin/lkp install job.yaml           # job file is attached in this email
>         bin/lkp split-job --compatible job.yaml # generate the yaml file for lkp run
>         sudo bin/lkp run generated-yaml-file
> 
>         # if come across any failure that blocks the test,
>         # please remove ~/.lkp and /lkp dir to run from a clean state.
> 
> 
> 
> --
> 0-DAY CI Kernel Test Service
> https://01.org/lkp
>