linux-kernel - Re: [RFC PATCH, x86]: Disable CPA cache flush for selfsnoop targets

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Message-ID: <20190715193938.GG32439@tassilo.jf.intel.com>
Date:   Mon, 15 Jul 2019 12:39:38 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Uros Bizjak <ubizjak@...il.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org, Andrew Lutomirski <luto@...nel.org>
Subject: Re: [RFC PATCH, x86]: Disable CPA cache flush for selfsnoop targets

> Right, we don't know where the PAT invocation comes from and whether they
> are safe to omit flushing the cache. The module load code would be one
> obvious candidate.

Module load just changes the writable/executable status, right? That shouldn't
need to flush in any case because it doesn't change the caching attributes.

-Andi