linux-kernel - Re: [PATCH v7 1/2] x86/mm: Don't disable INVLPG if "incomplete Global INVLPG flushes" is fixed by microcode

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Message-ID: <ZhgLuiKzCcBR8tNC@google.com>
Date: Thu, 11 Apr 2024 09:11:38 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Xi Ruoyao <xry111@...111.site>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>, Michael Kelley <mhklinux@...look.com>, 
	Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>, Andy Lutomirski <luto@...nel.org>, 
	Peter Zijlstra <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>, 
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org, 
	linux-kernel@...r.kernel.org, Andrew Cooper <andrew.cooper3@...rix.com>
Subject: Re: [PATCH v7 1/2] x86/mm: Don't disable INVLPG if "incomplete Global
 INVLPG flushes" is fixed by microcode

Don't disable *PCID*.

On Thu, Apr 11, 2024, Xi Ruoyao wrote:
> Per the "Processor Specification Update" documentations referred by the
> intel-microcode-20240312 release note, this microcode release has fixed
> the issue for all affected models.
> 
> So don't disable INVLPG if the microcode is new enough.  The precise

Same thing here.  INVLPG is very much still a thing, it's only PCID that gets
disabled.