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Subject: Re: [PATCH] x86/cpufeatures: Force disable X86_FEATURE_ENQCMD and
 remove update_pasid()
To:     "Luck, Tony" <tony.luck@intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Borislav Petkov <bp@alien8.de>
Cc:     "Yu, Fenghua" <fenghua.yu@intel.com>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        x86 <x86@kernel.org>,
        "iommu@lists.linux-foundation.org" <iommu@lists.linux-foundation.org>,
        Ingo Molnar <mingo@redhat.com>, H Peter Anvin <hpa@zytor.com>,
        Jean-Philippe Brucker <jean-philippe@linaro.org>,
        Christoph Hellwig <hch@infradead.org>,
        Peter Zijlstra <peterz@infradead.org>,
        David Woodhouse <dwmw2@infradead.org>,
        Lu Baolu <baolu.lu@linux.intel.com>,
        "Hansen, Dave" <dave.hansen@intel.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        "Raj, Ashok" <ashok.raj@intel.com>,
        "Pan, Jacob jun" <jacob.jun.pan@intel.com>,
        "Jiang, Dave" <dave.jiang@intel.com>,
        "Mehta, Sohil" <sohil.mehta@intel.com>,
        "Shankar, Ravi V" <ravi.v.shankar@intel.com>
References: <1600187413-163670-1-git-send-email-fenghua.yu@intel.com>
 <1600187413-163670-10-git-send-email-fenghua.yu@intel.com>
 <87mtsd6gr9.ffs@nanos.tec.linutronix.de> <YLShmFEzddfm7WQs@zn.tnic>
 <87y2bv438p.ffs@nanos.tec.linutronix.de>
 <36866b38ec92425b879881a88acf547b@intel.com>
 <db552f51-76ee-b7f5-20f1-14f1c703d423@kernel.org>
 <7d8788a9e04d4901a03bcea11e8e842b@intel.com>
From:   Andy Lutomirski <luto@kernel.org>
Message-ID: <bd5bb38c-0b81-a302-dd20-ef56fd970c9e@kernel.org>
Date:   Wed, 9 Jun 2021 16:34:31 -0700
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On 6/9/21 10:32 AM, Luck, Tony wrote:
>>> 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
> 

Let me try to merge my pile with tglx's pile and come up with something
halfway sane.