From: Borislav Petkov <bp@alien8.de>
To: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Tony Luck <tony.luck@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>,
kvm@vger.kernel.org
Subject: Re: [PATCH v2 02/16] x86/mce: WARN once if IA32_FEATURE_CONTROL MSR is left unlocked
Date: Fri, 25 Oct 2019 16:22:48 +0200 [thread overview]
Message-ID: <20191025142248.GD6483@zn.tnic> (raw)
In-Reply-To: <20191021235642.418-1-sean.j.christopherson@intel.com>
On Mon, Oct 21, 2019 at 04:56:42PM -0700, Sean Christopherson wrote:
> WARN if the IA32_FEATURE_CONTROL MSR is somehow left unlocked now that
> CPU initialization unconditionally locks the MSR.
>
> Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
> Cc: Wanpeng Li <wanpengli@tencent.com>
> Cc: Jim Mattson <jmattson@google.com>
> Cc: kvm@vger.kernel.org
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> ---
> arch/x86/kernel/cpu/mce/intel.c | 7 +++----
> 1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/mce/intel.c b/arch/x86/kernel/cpu/mce/intel.c
> index 88cd9598fa57..1008f14b803b 100644
> --- a/arch/x86/kernel/cpu/mce/intel.c
> +++ b/arch/x86/kernel/cpu/mce/intel.c
> @@ -117,11 +117,10 @@ static bool lmce_supported(void)
> * generate a #GP fault.
> */
> rdmsrl(MSR_IA32_FEATURE_CONTROL, tmp);
> - if ((tmp & (FEATURE_CONTROL_LOCKED | FEATURE_CONTROL_LMCE)) ==
> - (FEATURE_CONTROL_LOCKED | FEATURE_CONTROL_LMCE))
> - return true;
> + if (WARN_ON_ONCE(!(tmp & FEATURE_CONTROL_LOCKED)))
> + return false;
>
> - return false;
> + return tmp & FEATURE_CONTROL_LMCE;
> }
>
> bool mce_intel_cmci_poll(void)
> --
Reviewed-by: Borislav Petkov <bp@suse.de>
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2019-10-25 14:22 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-21 23:46 [PATCH v2 00/16] x86/cpu: Clean up handling of VMX features Sean Christopherson
2019-10-21 23:54 ` [PATCH v2 01/16] x86/intel: Initialize IA32_FEATURE_CONTROL MSR at boot Sean Christopherson
2019-10-22 0:15 ` Sean Christopherson
2019-10-25 14:09 ` Borislav Petkov
2019-10-25 15:11 ` Sean Christopherson
2019-10-21 23:56 ` [PATCH v2 02/16] x86/mce: WARN once if IA32_FEATURE_CONTROL MSR is left unlocked Sean Christopherson
2019-10-25 14:22 ` Borislav Petkov [this message]
2019-10-22 0:08 ` [PATCH v2 03/16] x86/centaur: Use common IA32_FEATURE_CONTROL MSR initialization Sean Christopherson
2019-10-22 0:08 ` [PATCH v2 04/16] x86/zhaoxin: " Sean Christopherson
2019-10-22 0:08 ` [PATCH v2 05/16] KVM: VMX: Drop initialization of IA32_FEATURE_CONTROL MSR Sean Christopherson
2019-10-22 10:51 ` Paolo Bonzini
2019-10-22 15:16 ` Sean Christopherson
2019-11-14 18:34 ` Sean Christopherson
2019-11-15 10:10 ` Paolo Bonzini
2019-10-25 16:26 ` Borislav Petkov
2019-10-25 16:39 ` Borislav Petkov
2019-10-22 0:08 ` [PATCH v2 06/16] x86/cpu: Clear VMX feature flag if VMX is not fully enabled Sean Christopherson
2019-10-25 16:38 ` Borislav Petkov
2019-11-14 18:32 ` Sean Christopherson
2019-11-15 10:05 ` Paolo Bonzini
2019-11-15 10:34 ` Borislav Petkov
2019-11-15 15:34 ` Sean Christopherson
2019-11-15 15:39 ` Borislav Petkov
2019-10-22 0:08 ` [PATCH v2 07/16] KVM: VMX: Use VMX feature flag to query BIOS enabling Sean Christopherson
2019-10-22 0:08 ` [PATCH v2 08/16] KVM: VMX: Check for full VMX support when verifying CPU compatibility Sean Christopherson
2019-10-22 0:08 ` [PATCH v2 09/16] x86/vmx: Introduce VMX_FEATURES_* Sean Christopherson
2019-10-22 0:08 ` [PATCH v2 10/16] x86/cpu: Detect VMX features on Intel, Centaur and Zhaoxin CPUs Sean Christopherson
2019-10-22 0:08 ` [PATCH v2 11/16] x86/cpu: Print VMX flags in /proc/cpuinfo using VMX_FEATURES_* Sean Christopherson
2019-10-22 0:08 ` [PATCH v2 12/16] x86/cpufeatures: Drop synthetic VMX feature flags Sean Christopherson
2019-10-22 0:08 ` [PATCH v2 13/16] KVM: VMX: Use VMX_FEATURE_* flags to define VMCS control bits Sean Christopherson
2019-10-22 0:09 ` [PATCH v2 14/16] x86/cpufeatures: Clean up synthetic virtualization flags Sean Christopherson
2019-10-22 0:12 ` [PATCH v2 15/16] perf/x86: Provide stubs of KVM helpers for non-Intel CPUs Sean Christopherson
2019-10-22 0:12 ` [PATCH v2 16/16] KVM: VMX: Allow KVM_INTEL when building for Centaur and/or Zhaoxin CPUs Sean Christopherson
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