linux-kernel - Re: [PATCH] x86/split_lock: Enable the split lock detect feature on Raptor Lake P and Alder Lake N CPUs

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Date:   Tue, 5 Jul 2022 12:46:10 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Fenghua Yu <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>, Tony Luck <tony.luck@...el.com>
Cc:     x86 <x86@...nel.org>, linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86/split_lock: Enable the split lock detect feature on
 Raptor Lake P and Alder Lake N CPUs

I have an alternative patch.

Let's just consider the MSR_IA32_CORE_CAPS_SPLIT_LOCK_DETECT bit to be
architectural.  Are there *ACTUAL* implementations where this is wrong?
 If not, let's just make it part of the architecture.  Intel can then
keep it true forever.

Some documentation which says:

	All processors that enumerate support for MSR_IA32_CORE_CAPS and
	set MSR_IA32_CORE_CAPS_SPLIT_LOCK_DETECT support split lock 	
	detection.

would suffice, I think.  Just look at the diffstat.  What's not to love?
View attachment "split-lock-arch.patch" of type "text/x-patch" (2832 bytes)