linux-kernel - Re: [PATCH] x86/pat: Fix off-by-one bugs in interval tree search

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Message-ID: <alpine.DEB.2.21.1912011205350.2748@hp-x360n>
Date:   Sun, 1 Dec 2019 12:09:31 -0800 (PST)
From:   "Kenneth R. Crudup" <kenny@...ix.com>
To:     Ingo Molnar <mingo@...nel.org>
cc:     Linus Torvalds <torvalds@...ux-foundation.org>, mceier@...il.com,
        Davidlohr Bueso <dave@...olabs.net>,
        kernel test robot <rong.a.chen@...el.com>,
        Davidlohr Bueso <dbueso@...e.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org
Subject: Re: [PATCH] x86/pat: Fix off-by-one bugs in interval tree search


> > uncached-minus @ 0xfed91000-0xfed92000
> > uncached-minus @ 0xff340000-0xff341000
> > write-combining @ 0x4000000000-0x4010000000
> > uncached-minus @ 0x4010000000-0x4010001000

On Sun, 1 Dec 2019, Ingo Molnar wrote:

> I believe this is the region that caused the problem, the 0x4010000000
> 'end' address of the WC region is the same as the 0x4010000000 'start'
> address of the UC- region that follows it.

> > write-combining @ 0x604a800000-0x604b000000
> > uncached-minus @ 0x604b100000-0x604b110000

> This WC region was probably unaffected by the bug.

For my education, and for completeness' sake, is there a proc/sys entry
that would tell me which device/module has reserved which PAT region?

	-Kenny

-- 
Kenneth R. Crudup  Sr. SW Engineer, Scott County Consulting, Silicon Valley