linux-kernel - Re: [RFC PATCH] x86/mm: Fix PAT bit missing from page protection modify mask

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Message-ID: <ZEuv+PoleXWAa4Nw@ashyti-mobl2.lan>
Date:   Fri, 28 Apr 2023 13:37:28 +0200
From:   Andi Shyti <andi.shyti@...ux.intel.com>
To:     Janusz Krzysztofik <janusz.krzysztofik@...ux.intel.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        Yu Zhao <yuzhao@...gle.com>, Juergen Gross <jgross@...e.com>,
        linux-kernel@...r.kernel.org,
        Andi Shyti <andi.shyti@...ux.intel.com>,
        Chris Wilson <chris.p.wilson@...ux.intel.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Nirmoy Das <nirmoy.das@...el.com>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Subject: Re: [RFC PATCH] x86/mm: Fix PAT bit missing from page protection
 modify mask

Hi Janusz,

On Mon, Apr 24, 2023 at 02:35:24PM +0200, Janusz Krzysztofik wrote:
> Visible glitches have been observed when running graphics applications on
> Linux under Xen hypervisor.  Those observations have been confirmed with
> failures from kms_pwrite_crc Intel GPU test that verifies data coherency
> of DRM frame buffer objects using hardware CRC checksums calculated by
> display controllers, exposed to userspace via debugfs.  Affected
> processing paths have then been identified with new test variants that
> mmap the objects using different methods and caching modes.

BTW, are you going to update those tests in IGT?

Andi