linux-kernel - Re: [PATCH v8 4/4] kvm: vmx: virtualize split lock detection

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Message-ID: <906dd919-3ae5-5279-b706-168e509ce953@intel.com>
Date:   Thu, 16 Apr 2020 10:12:26 +0800
From:   Xiaoyao Li <xiaoyao.li@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
        Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Arvind Sankar <nivedita@...m.mit.edu>
Subject: Re: [PATCH v8 4/4] kvm: vmx: virtualize split lock detection

On 4/16/2020 3:47 AM, Thomas Gleixner wrote:
> Xiaoyao Li <xiaoyao.li@...el.com> writes:
> 
>> Due to the fact that TEST_CTRL MSR is per-core scope, i.e., the sibling
>> threads in the same physical CPU core share the same MSR, only
>> advertising feature split lock detection to guest when SMT is disabled
>> or unsupported, for simplicitly.
> 
> That's not for simplicity. It's for correctness because you cannot
> provide consistent state to a guest.
> 

I'll correct it.

Thanks!
-Xiaoyao