linux-kernel - RE: [PATCH] x86/cpufeatures: Force disable X86_FEATURE_ENQCMD and remove update

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Date:   Wed, 9 Jun 2021 17:32:02 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>
CC:     "Yu, Fenghua" <fenghua.yu@...el.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        x86 <x86@...nel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "Ingo Molnar" <mingo@...hat.com>, H Peter Anvin <hpa@...or.com>,
        "Jean-Philippe Brucker" <jean-philippe@...aro.org>,
        Christoph Hellwig <hch@...radead.org>,
        Peter Zijlstra <peterz@...radead.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        "Mehta, Sohil" <sohil.mehta@...el.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>
Subject: RE: [PATCH] x86/cpufeatures: Force disable X86_FEATURE_ENQCMD and
 remove update_pasid()

>> I've told Fenghua to dig out the previous iteration of this patch where
>> the plan was to lazily fix the PASID_MSR in other threads in the #GP
>> handler.
>
> Blech.  Also this won't work for other PASID-like features.
>
> I have a half-written patch to fix this up for real.  Stay tuned.

Andy: Any update on this?

-Tony