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Date:   Mon, 15 Jul 2019 12:38:36 -0700
From:   Andi Kleen <ak@linux.intel.com>
To:     Thomas Gleixner <tglx@linutronix.de>
Cc:     Uros Bizjak <ubizjak@gmail.com>,
        LKML <linux-kernel@vger.kernel.org>, X86 ML <x86@kernel.org>,
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Subject: Re: [RFC PATCH, x86]: Disable CPA cache flush for selfsnoop targets
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> 
> 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