linux-kernel - Re: [PATCH v2 00/11] Re-enable ENQCMD and PASID MSR

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Date:   Mon, 27 Dec 2021 09:52:36 -0800
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>
Cc:     iommu@...ts.linux-foundation.org, x86 <x86@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 00/11] Re-enable ENQCMD and PASID MSR

Hi, Dear Maintainers,

On Fri, Dec 17, 2021 at 10:01:25PM +0000, Fenghua Yu wrote:
> Problems in the old code to manage SVM (Shared Virtual Memory) devices
> and the PASID (Process Address Space ID) led to that code being
> disabled.
> 
> Subsequent discussions resulted in a far simpler approach:
> 
> 1) PASID life cycle is from first allocation by a process until that
>    process exits.
> 2) All tasks begin with PASID disabled
> 3) The #GP fault handler tries to fix faulting ENQCMD instructions very
>    early (thus avoiding complexities of the XSAVE infrastructure)

Any comments on this series?

Thanks.

-Fenghua