linux-kernel - Re: [RFC KVM 01/27] kernel: Export memory-management symbols required for KVM address space isolation

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Message-ID: <20190513151550.GZ2589@hirez.programming.kicks-ass.net>
Date:   Mon, 13 May 2019 17:15:50 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Alexandre Chartre <alexandre.chartre@...cle.com>
Cc:     pbonzini@...hat.com, rkrcmar@...hat.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        dave.hansen@...ux.intel.com, luto@...nel.org, kvm@...r.kernel.org,
        x86@...nel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        konrad.wilk@...cle.com, jan.setjeeilers@...cle.com,
        liran.alon@...cle.com, jwadams@...gle.com
Subject: Re: [RFC KVM 01/27] kernel: Export memory-management symbols
 required for KVM address space isolation

On Mon, May 13, 2019 at 04:38:09PM +0200, Alexandre Chartre wrote:
> From: Liran Alon <liran.alon@...cle.com>
> 
> Export symbols needed to create, manage, populate and switch
> a mm from a kernel module (kvm in this case).
> 
> This is a hacky way for now to start.
> This should be changed to some suitable memory-management API.

This should not be exported at all, ever, end of story.

Modules do not get to play with address spaces like that.