linux-kernel - Re: [PATCH v11 9/9] x86/cpu: Enable LASS by default during CPU initialization

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Message-ID: <c061a802-3ba4-4d4e-bff3-1a3465c64163@intel.com>
Date: Fri, 31 Oct 2025 13:04:55 -0700
From: Sohil Mehta <sohil.mehta@...el.com>
To: Dave Hansen <dave.hansen@...el.com>, <x86@...nel.org>, Dave Hansen
	<dave.hansen@...ux.intel.com>, Thomas Gleixner <tglx@...utronix.de>, "Ingo
 Molnar" <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>
CC: Jonathan Corbet <corbet@....net>, "H . Peter Anvin" <hpa@...or.com>, "Andy
 Lutomirski" <luto@...nel.org>, Josh Poimboeuf <jpoimboe@...nel.org>, "Peter
 Zijlstra" <peterz@...radead.org>, Ard Biesheuvel <ardb@...nel.org>, "Kirill A
 . Shutemov" <kas@...nel.org>, Xin Li <xin@...or.com>, David Woodhouse
	<dwmw@...zon.co.uk>, Sean Christopherson <seanjc@...gle.com>, Rick Edgecombe
	<rick.p.edgecombe@...el.com>, Vegard Nossum <vegard.nossum@...cle.com>,
	Andrew Cooper <andrew.cooper3@...rix.com>, Randy Dunlap
	<rdunlap@...radead.org>, Geert Uytterhoeven <geert@...ux-m68k.org>, Kees Cook
	<kees@...nel.org>, Tony Luck <tony.luck@...el.com>, Alexander Shishkin
	<alexander.shishkin@...ux.intel.com>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-efi@...r.kernel.org>
Subject: Re: [PATCH v11 9/9] x86/cpu: Enable LASS by default during CPU
 initialization

On 10/31/2025 10:21 AM, Dave Hansen wrote:

> 
> But I can fix that up when I apply this. I think it's mostly ready.
> 

Thanks a lot for all the reviews. I'll try to get the EFI thing sorted.

If we end up applying this revision, can you please remove the "default"
from the patch title.

Making LASS depend on CONFIG_X86_VSYSCALL_EMULATION makes it off by default.