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From: Sean Christopherson <sean.j.christopherson@intel.com>
To: Jacob Keller <jacob.e.keller@intel.com>
Cc: TonyWWang-oc@zhaoxin.com, acme@kernel.org,
	alexander.shishkin@linux.intel.com, bp@alien8.de, bp@suse.de,
	hpa@zytor.com, jacob.jun.pan@linux.intel.com,
	jarkko.sakkinen@linux.intel.com, jmattson@google.com,
	jolsa@redhat.com, joro@8bytes.org, kvm@vger.kernel.org,
	lenb@kernel.org, linux-edac@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
	linux-pm@vger.kernel.org, mark.rutland@arm.com, mingo@redhat.com,
	namhyung@kernel.org, pbonzini@redhat.com, peterz@infradead.org,
	rkrcmar@redhat.com, shuah@kernel.org, tglx@linutronix.de,
	tony.luck@intel.com, vkuznets@redhat.com, wanpengli@tencent.com,
	x86@kernel.org
Subject: Re: [PATCH v5 13/19] x86/cpufeatures: Add flag to track whether MSR IA32_FEAT_CTL is configured
Date: Wed, 26 Feb 2020 18:12:21 -0800
Message-ID: <20200227021221.GA14478@linux.intel.com> (raw)
In-Reply-To: <e741196d-52aa-0f5e-8f1e-a37ddf2e5025@intel.com>

On Tue, Feb 25, 2020 at 01:49:13PM -0800, Jacob Keller wrote:
> I recently ran into a general protection fault that I believe is the
> fault of this patch:
> 
> > [   32.189584] general protection fault, maybe for address 0xffffb567801bcf58: 0000 [#1] SMP PTI
> > [   32.198103] CPU: 1 PID: 2600 Comm: rngd Not tainted 5.6.0-rc2-jk+ #2
> > [   32.204454] Hardware name: Intel Corporation S2600STQ/S2600STQ, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019
> > [   32.214887] RIP: 0010:hardware_enable+0x100/0x1a0 [kvm_intel]
> > [   32.220628] Code: <f3> 0f c7 34 24 31 c0 80 3d 59 8d 03 00 00 75 36 48 8b 5c 24 10 65
> > [   32.239373] RSP: 0000:ffffb567801bcf58 EFLAGS: 00010002
> > [   32.244598] RAX: 0000000000300000 RBX: 0000000000000086 RCX: ffff8f2650440000
> > [   32.251730] RDX: 0000000000300000 RSI: 0000000000000000 RDI: ffff8f2650457020
> > [   32.258862] RBP: 0000000000000007 R08: 000000077ea5d531 R09: 0000000000000000
> > [   32.265986] R10: 000001432bf20982 R11: 0000000000000000 R12: ffffd55b80467110
> > [   32.273118] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> > [   32.280243] FS:  00007facfe66f700(0000) GS:ffff8f2650440000(0000) knlGS:0000000000000000
> > [   32.288329] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [   32.294077] CR2: 00007facf0003000 CR3: 0000000b7d402006 CR4: 00000000007626e0
> > [   32.301210] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > [   32.308342] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> > [   32.315474] PKRU: 55555554
> > [   32.318186] Call Trace:
> > [   32.320642]  <IRQ>
> > [   32.322689]  kvm_arch_hardware_enable+0x84/0x240 [kvm]
> > [   32.327836]  hardware_enable_nolock+0x31/0x60 [kvm]
> > [   32.332717]  flush_smp_call_function_queue+0x4d/0xe0
> > [   32.337683]  smp_call_function_interrupt+0x3a/0xd0
> > [   32.342471]  call_function_interrupt+0xf/0x20
> > [   32.346830]  </IRQ>
> > [   32.498314] ---[ end trace bfeeeba337a01208 ]---
> 
> I noticed that a slightly older commit from before this does not fail.
> Additionally, the system reports the following during boot:
> 
> kvm: disabled by bios

One other thing that's been bothering me; you mention in a later email that
this bug resulting in a crash during boot.  The low timestamps also suggest
the system is fairly early in its bringup.

But KVM only does VMXON when it actually creates a VM[*].  During boot I
would expect the bug to result in KVM being incorrectly loaded/enabled, but
that alone wouldn't trigger a crash.

I assume/hope your system is automatically running some form of virt
process at boot?  Not that there's anything wrong with that, it's just
suprising and I want to make sure there's not something really funky going
on.

[*] KVM also does VMXON when hotplugging a CPU, but only if KVM has active
    VMs, and the IPI callback above indicates this isn't the hotplug case.

  parent reply index

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-21  4:44 [PATCH v5 00/19] x86/cpu: Clean up handling of VMX features Sean Christopherson
2019-12-21  4:44 ` [PATCH v5 01/19] x86/msr-index: Clean up bit defines for IA32_FEATURE_CONTROL MSR Sean Christopherson
2019-12-21  4:44 ` [PATCH v5 02/19] selftests: kvm: Replace manual MSR defs with common msr-index.h Sean Christopherson
2019-12-21  4:44 ` [PATCH v5 03/19] tools arch x86: Sync msr-index.h from kernel sources Sean Christopherson
2019-12-21  4:44 ` [PATCH v5 04/19] x86/intel: Initialize IA32_FEAT_CTL MSR at boot Sean Christopherson
2019-12-21  4:44 ` [PATCH v5 05/19] x86/mce: WARN once if IA32_FEAT_CTL MSR is left unlocked Sean Christopherson
2019-12-21  4:45 ` [PATCH v5 06/19] x86/centaur: Use common IA32_FEAT_CTL MSR initialization Sean Christopherson
2019-12-21  4:45 ` [PATCH v5 07/19] x86/zhaoxin: " Sean Christopherson
2019-12-21  4:45 ` [PATCH v5 08/19] x86/cpu: Clear VMX feature flag if VMX is not fully enabled Sean Christopherson
2019-12-21  4:45 ` [PATCH v5 09/19] x86/vmx: Introduce VMX_FEATURES_* Sean Christopherson
2019-12-21  4:45 ` [PATCH v5 10/19] x86/cpu: Detect VMX features on Intel, Centaur and Zhaoxin CPUs Sean Christopherson
2019-12-21  4:45 ` [PATCH v5 11/19] x86/cpu: Print VMX flags in /proc/cpuinfo using VMX_FEATURES_* Sean Christopherson
2019-12-21  4:45 ` [PATCH v5 12/19] x86/cpu: Set synthetic VMX cpufeatures during init_ia32_feat_ctl() Sean Christopherson
2019-12-21  4:45 ` [PATCH v5 13/19] x86/cpufeatures: Add flag to track whether MSR IA32_FEAT_CTL is configured Sean Christopherson
2020-02-25 21:49   ` Jacob Keller
2020-02-25 22:12     ` Sean Christopherson
2020-02-25 22:52       ` Jacob Keller
2020-02-25 23:29         ` Sean Christopherson
2020-02-25 23:35           ` Jacob Keller
2020-02-25 23:54           ` Jacob Keller
2020-02-26  0:41             ` Jacob Keller
2020-02-26  0:42             ` Sean Christopherson
2020-02-26  0:58               ` Jacob Keller
2020-02-26 20:41                 ` Jacob Keller
2020-02-26 20:57                   ` Sean Christopherson
2020-02-26 21:03                     ` Jacob Keller
2020-02-26 21:25                       ` Sean Christopherson
2020-02-26 21:53                         ` Jacob Keller
2020-02-27  2:12     ` Sean Christopherson [this message]
2020-02-27  4:20       ` Huang, Kai
2020-02-27 18:09       ` Jacob Keller
2019-12-21  4:45 ` [PATCH v5 14/19] KVM: VMX: Drop initialization of IA32_FEAT_CTL MSR Sean Christopherson
2019-12-21  4:45 ` [PATCH v5 15/19] KVM: VMX: Use VMX feature flag to query BIOS enabling Sean Christopherson
2019-12-21  4:45 ` [PATCH v5 16/19] KVM: VMX: Check for full VMX support when verifying CPU compatibility Sean Christopherson
2019-12-21  4:45 ` [PATCH v5 17/19] KVM: VMX: Use VMX_FEATURE_* flags to define VMCS control bits Sean Christopherson
2020-01-13 18:32   ` Borislav Petkov
2020-01-13 18:37     ` Sean Christopherson
2020-01-13 18:38       ` Borislav Petkov
2020-01-13 18:42         ` Sean Christopherson
2020-01-13 18:52           ` [PATCH] KVM: VMX: Rename define to CPU_BASED_USE_TSC_OFFSETTING Borislav Petkov
2020-01-13 20:16             ` Sean Christopherson
2020-01-14  9:31               ` Borislav Petkov
2020-01-14 17:27                 ` Sean Christopherson
2019-12-21  4:45 ` [PATCH v5 18/19] perf/x86: Provide stubs of KVM helpers for non-Intel CPUs Sean Christopherson
2019-12-21  4:45 ` [PATCH v5 19/19] KVM: VMX: Allow KVM_INTEL when building for Centaur and/or Zhaoxin CPUs Sean Christopherson

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