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From: Xiaoyao Li <xiaoyao.li@intel.com>
To: Andy Lutomirski <luto@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Sean Christopherson <sean.j.christopherson@intel.com>,
	kvm list <kvm@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>, X86 ML <x86@kernel.org>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Arvind Sankar <nivedita@alum.mit.edu>,
	Tony Luck <tony.luck@intel.com>,
	Fenghua Yu <fenghua.yu@intel.com>
Subject: Re: [PATCH v9 8/8] x86/split_lock: Enable split lock detection initialization when running as an guest on KVM
Date: Mon, 11 May 2020 09:11:20 +0800	[thread overview]
Message-ID: <0f7b29e5-bf12-36f9-3b92-5fea8accf037@intel.com> (raw)
In-Reply-To: <CALCETrWJGyyyvsgryvro45WNNpnSZ2k_QEjm95-+5rvREztOYA@mail.gmail.com>

On 5/10/2020 1:15 PM, Andy Lutomirski wrote:
> On Fri, May 8, 2020 at 8:04 PM Xiaoyao Li <xiaoyao.li@intel.com> wrote:
>>
>> When running as guest, enumerating feature split lock detection through
>> CPU model is not easy since CPU model is configurable by host VMM.
>>
>> If running upon KVM, it can be enumerated through
>> KVM_FEATURE_SPLIT_LOCK_DETECT,
> 
> This needs crystal clear documentation.  What, exactly, is the host
> telling the guest if it sets this flag?
> 
>> and if KVM_HINTS_SLD_FATAL is set, it
>> needs to be set to sld_fatal mode.
> 
> 
> This needs much better docs.  Do you mean:
> 
> "If KVM_HINTS_SLD_FATAL is set, then the guest will get #AC if it does
> a split-lock regardless of what is written to MSR_TEST_CTRL?"
> 

Hi Andy,

KVM_FEATURE_SPLIT_LOCK_DETECT, KVM_HINTS_SLD_FATAL and their docs are 
introduced in Patch 5. Do I still need to explain them in detail in this 
patch?

  reply	other threads:[~2020-05-11  1:11 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-09 11:05 [PATCH v9 0/8] KVM: Add virtualization support of split lock detection Xiaoyao Li
2020-05-09 11:05 ` [PATCH v9 1/8] x86/split_lock: Rename TIF_SLD to TIF_SLD_DISABLED Xiaoyao Li
2020-05-09 11:05 ` [PATCH v9 2/8] x86/split_lock: Remove bogus case in handle_guest_split_lock() Xiaoyao Li
2020-05-09 11:05 ` [PATCH v9 3/8] x86/split_lock: Introduce flag X86_FEATURE_SLD_FATAL and drop sld_state Xiaoyao Li
2020-05-10  5:14   ` Andy Lutomirski
2020-05-11 18:17     ` Sean Christopherson
2020-05-09 11:05 ` [PATCH v9 4/8] x86/split_lock: Introduce split_lock_virt_switch() and two wrappers Xiaoyao Li
2020-05-09 11:05 ` [PATCH v9 5/8] x86/kvm: Introduce paravirt split lock detection enumeration Xiaoyao Li
2020-05-09 11:05 ` [PATCH v9 6/8] KVM: VMX: Enable MSR TEST_CTRL for guest Xiaoyao Li
2020-05-09 11:05 ` [PATCH v9 7/8] KVM: VMX: virtualize split lock detection Xiaoyao Li
2020-05-09 11:05 ` [PATCH v9 8/8] x86/split_lock: Enable split lock detection initialization when running as an guest on KVM Xiaoyao Li
2020-05-10  5:15   ` Andy Lutomirski
2020-05-11  1:11     ` Xiaoyao Li [this message]
2020-05-18  1:27 ` [PATCH v9 0/8] KVM: Add virtualization support of split lock detection Xiaoyao Li
2020-05-26  6:19   ` Xiaoyao Li
2020-07-01  2:46 ` Xiaoyao Li

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