Date: Tue, 22 Mar 2016 18:01:35 +0100
From: Borislav Petkov <bp@suse.de>
To: Toshi Kani <toshi.kani@hpe.com>
Cc: mingo@kernel.org, hpa@zytor.com, tglx@linutronix.de, mcgrof@suse.com,
        jgross@suse.com, paul.gortmaker@windriver.com, konrad.wilk@oracle.com,
        elliott@hpe.com, x86@kernel.org, xen-devel@lists.xenproject.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 4/6] x86/mtrr: Fix PAT init handling when MTRR MSR is
 disabled
Message-ID: <20160322170135.GE5656@pd.tnic>
References: <1458175619-32206-1-git-send-email-toshi.kani@hpe.com>
 <1458175619-32206-3-git-send-email-toshi.kani@hpe.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <1458175619-32206-3-git-send-email-toshi.kani@hpe.com>
User-Agent: Mutt/1.5.24 (2015-08-30)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 961
Lines: 37

Subject: [PATCH v2 4/6] x86/mtrr: Fix PAT init handling when MTRR MSR is disabled

s/ MSR//

On Wed, Mar 16, 2016 at 06:46:57PM -0600, Toshi Kani wrote:
> get_mtrr_state() calls pat_init() on BSP even if MTRR is disabled
> by its MSR.

s/by its MSR//

> This causes pat_init() to be called on BSP only since APs do not call

This doesn't cause that - get_mtrr_state() is called only on the BSP by
mtrr_bp_init().

> pat_init() when MTRR is disabled. This inconsistency between BSP and
> APs leads undefined behavior.

      leads to


> Move BSP's PAT init code from get_mtrr_state() to mtrr_bp_pat_init().
> Change mtrr_bp_init() to call mtrr_bp_pat_init() if MTRR is enabled.

No need for those.

> This keeps BSP's calling condition to pat_init() consistent with AP's,
> mtrr_ap_init() and mtrr_aps_init().

This one is fine.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--