linux-kernel - Re: [KVM] 6b6a864bd7: kernel-selftests.kvm.vmx_tsc_adjust

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Message-ID: <20200511213537.GG24052@linux.intel.com>
Date:   Mon, 11 May 2020 14:35:37 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     kernel test robot <rong.a.chen@...el.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, lkp@...ts.01.org,
        xudong.hao@...el.com
Subject: Re: [KVM] 6b6a864bd7: kernel-selftests.kvm.vmx_tsc_adjust_test.fail

On Mon, May 11, 2020 at 09:09:26AM +0800, kernel test robot wrote:
> Greeting,
> 
> FYI, we noticed the following commit (built with gcc-7):
> 
> commit: 6b6a864bd7d7eb12a82ec6da1c2dd97a43f79449 ("[PATCH v2] KVM: nVMX: Tweak handling of failure code for nested VM-Enter failure")
> url: https://github.com/0day-ci/linux/commits/Sean-Christopherson/KVM-nVMX-Tweak-handling-of-failure-code-for-nested-VM-Enter-failure/20200429-052911
> base: https://git.kernel.org/cgit/virt/kvm/kvm.git linux-next
> 
> in testcase: kernel-selftests
> with following parameters:
> 
> 	group: kselftests-kvm
> 	ucode: 0x500002c
> 
> 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: 192 threads Intel(R) Xeon(R) Platinum 9242 CPU @ 2.30GHz with 192G 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 <rong.a.chen@...el.com>
> 
> 
> 
> # selftests: kvm: vmx_tsc_adjust_test
> # ==== Test Assertion Failure ====
> #   x86_64/vmx_tsc_adjust_test.c:153: false
> #   pid=12157 tid=12157 - Interrupted system call
> #      1	0x000000000040116a: main at vmx_tsc_adjust_test.c:153
> #      2	0x00007fafd54bce0a: ?? ??:0
> #      3	0x00000000004011e9: _start at ??:?
> #   Failed guest assert: (vmreadz(VM_EXIT_REASON) == (0x80000000 | 33))
> # IA32_TSC_ADJUST is -4294972240 (-1 * TSC_ADJUST_VALUE + -4944).
> not ok 14 selftests: kvm: vmx_tsc_adjust_test # exit=254

Ugh, missed the prepare_vmcs02() path.  v3 incoming.