linux-kernel - RE: [PATCH 6/7] x86/traps: Fix up invalid PASID

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Date:   Mon, 27 Apr 2020 23:08:59 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     "Raj, Ashok" <ashok.raj@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>
CC:     "Yu, Fenghua" <fenghua.yu@...el.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        H Peter Anvin <hpa@...or.com>,
        "David Woodhouse" <dwmw2@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        "Hansen, Dave" <dave.hansen@...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>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        x86 <x86@...nel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>
Subject: RE: [PATCH 6/7] x86/traps: Fix up invalid PASID

> Just for the record I also suggested to have a proper errorcode in the
> #GP for ENQCMD and I surely did not suggest to avoid decoding the user
> instructions.

Thomas,

Is the heuristic to avoid decoding the user instructions OK (you are just pointing
out that you should not be given credit for this part of the idea)?

Or are you saying that you'd like to see the instruction checked to see that it
was an ENQCMD?

-Tony