linux-kernel - Re: [PATCH] powerpc: warn on emulation of dcbz instruction

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Message-ID: <55941ad30ce5515e6955565e3fa155f6caa2a896.camel@kernel.crashing.org>
Date:   Fri, 17 Sep 2021 22:33:46 +1000
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     David Laight <David.Laight@...LAB.COM>,
        "'Christophe Leroy'" <christophe.leroy@...roup.eu>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        Stan Johnson <userm57@...oo.com>,
        Finn Thain <fthain@...ux-m68k.org>
Subject: Re: [PATCH] powerpc: warn on emulation of dcbz instruction

On Thu, 2021-09-16 at 14:36 +0000, David Laight wrote:
> > Does userspace accesses non-cached memory directly ?
> 
> 
> It probably can if a driver mmaps PCI space directly into user space.
> 
> That certainly works on x86-64.

The posterchild for that is Xorg

Cheers,
Ben.