linux-kernel - Re: [PATCH 2/2] x86/mtrr: Refactor PAT initialization code

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Message-ID: <20160311090140.GA4873@gmail.com>
Date:	Fri, 11 Mar 2016 10:01:40 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Toshi Kani <toshi.kani@....com>
Cc:	bp@...e.de, hpa@...or.com, tglx@...utronix.de, mcgrof@...e.com,
	jgross@...e.com, paul.gortmaker@...driver.com, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] x86/mtrr: Refactor PAT initialization code


* Toshi Kani <toshi.kani@....com> wrote:

> MTRR manages PAT initialization as it implements a rendezvous
> handler that initializes PAT as part of MTRR initialization.
> 
> When CPU does not support MTRR, ex. qemu32 virtual CPU, MTRR
> simply skips PAT init, which causes PAT left enabled without
> initialization. [...]

What practical effects does this have to the user? Does the kernel crash?

Thanks,

	Ingo