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

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Message-ID: <20190715193836.GF32439@tassilo.jf.intel.com>
Date:   Mon, 15 Jul 2019 12:38:36 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Uros Bizjak <ubizjak@...il.com>,
        LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        Andrew Lutomirski <luto@...nel.org>
Subject: Re: [RFC PATCH, x86]: Disable CPA cache flush for selfsnoop targets

> 
> That does not answer the question whether it's worthwhile to do that.

It's likely worthwhile for (Intel integrated) graphics. 

There was also a recent issue with 3dxp/dax, which uses ioremap in some
cases.

-Andi