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From: Toshi Kani <toshi.kani@hpe.com>
To: Borislav Petkov <bp@suse.de>
Cc: jgross@suse.com, mcgrof@suse.com, x86@kernel.org,
	linux-kernel@vger.kernel.org, paul.gortmaker@windriver.com,
	hpa@zytor.com, xen-devel@lists.xenproject.org,
	tglx@linutronix.de, mingo@kernel.org, elliott@hpe.com
Subject: Re: [PATCH v2 1/6] x86/mm/pat: Change PAT to support non-default PAT MSR
Date: Wed, 23 Mar 2016 09:46:15 -0600	[thread overview]
Message-ID: <1458747975.6393.646.camel__23362.7030429945$1458744914$gmane$org@hpe.com> (raw)
In-Reply-To: <20160323084305.GA8031@pd.tnic>

On Wed, 2016-03-23 at 09:43 +0100, Borislav Petkov wrote:
> On Tue, Mar 22, 2016 at 12:35:19PM -0600, Toshi Kani wrote:
> > Right.  Will change to "Add support of non-default PAT MSR setting at
> > handoff".
> 
> Please remove this "handoff" notion from the text. Every hw register is
> being handed off to the OS once the kernel takes over so there's no need
> to make it special here.

Will do.

> > I'd like to make it clear that this function does not set PAT MSR,
> > unlike what pat_init() does.  When CPU supports PAT, it keeps PAT MSR
> > in whatever the setting at handoff, and initializes PAT table to match
> > with this setting.
> > 
> > I am open to a better name, but I am afraid that setup_pat() can be
> > confusing as if it sets PAT MSR.
> 
> So call it init_cache_modes() and rename the current
> pat_init_cache_modes() to __init_cache_modes() to denote it is a lower
> level helper of the init_cache_modes() one. The init_cache_modes() one
> deals with the higher level figuring out of whether PAT is enabled and
> if not, preparing the attr bits for emulation. In the end, it calls
> __init_cache_modes(). All nice and easy.

Good idea!  Will do.

Thanks,
-Toshi

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  reply	other threads:[~2016-03-23 14:53 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1458175502-31936-1-git-send-email-toshi.kani@hpe.com>
2016-03-17  0:44 ` Toshi Kani
     [not found] ` <1458175502-31936-2-git-send-email-toshi.kani@hpe.com>
2016-03-22 16:57   ` Borislav Petkov
     [not found]   ` <20160322165725.GB5656@pd.tnic>
2016-03-22 18:35     ` Toshi Kani
2016-03-23  8:43       ` Borislav Petkov
2016-03-23 15:46         ` Toshi Kani [this message]
2016-03-22 19:17     ` Thomas Gleixner

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