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From: Borislav Petkov <bp@suse.de>
To: Toshi Kani <toshi.kani@hpe.com>, jgross@suse.com
Cc: 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 5/6] x86/xen, pat: Remove PAT table init code from Xen
Date: Tue, 22 Mar 2016 18:02:06 +0100	[thread overview]
Message-ID: <20160322170206.GF5656__42544.3564112813$1458666198$gmane$org@pd.tnic> (raw)
In-Reply-To: <1458175619-32206-4-git-send-email-toshi.kani@hpe.com>

On Wed, Mar 16, 2016 at 06:46:58PM -0600, Toshi Kani wrote:
> Xen supports PAT without MTRR for its guests.  In order to
> enable WC attribute, it was necessary for xen_start_kernel()
> to call pat_init_cache_modes() to update PAT table before
> starting guest kernel.
> 
> Now that the kernel initializes PAT table to the BIOS handoff
> state when MTRR is disabled, this Xen-specific PAT init code
> is no longer necessary.  Delete it from xen_start_kernel().
> 
> Also change pat_init_cache_modes() to a static function since
> PAT table should not be tweaked by other modules.
> 
> Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> Cc: Borislav Petkov <bp@suse.de>
> Cc: Luis R. Rodriguez <mcgrof@suse.com>
> Cc: Juergen Gross <jgross@suse.com>
> Cc: Ingo Molnar <mingo@kernel.org>
> Cc: H. Peter Anvin <hpa@zytor.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> ---
>  arch/x86/include/asm/pat.h |    1 -
>  arch/x86/mm/pat.c          |    2 +-
>  arch/x86/xen/enlighten.c   |    9 ---------
>  3 files changed, 1 insertion(+), 11 deletions(-)

Jürgen, ack?

-- 
Regards/Gruss,
    Boris.

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

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  parent reply	other threads:[~2016-03-22 17:02 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-17  0:46 [PATCH v2 2/6] x86/mm/pat: Add pat_disable() interface Toshi Kani
2016-03-17  0:46 ` [PATCH v2 3/6] x86/mtrr: Fix Xorg crashes in Qemu sessions Toshi Kani
2016-03-17  0:46 ` [PATCH v2 4/6] x86/mtrr: Fix PAT init handling when MTRR MSR is disabled Toshi Kani
2016-03-17  0:46 ` [PATCH v2 5/6] x86/xen, pat: Remove PAT table init code from Xen Toshi Kani
2016-03-17  0:46 ` [PATCH v2 6/6] x86/pat: Document PAT initializations Toshi Kani
2016-03-22 16:59 ` [PATCH v2 2/6] x86/mm/pat: Add pat_disable() interface Borislav Petkov
     [not found] ` <1458175619-32206-2-git-send-email-toshi.kani@hpe.com>
2016-03-22 17:00   ` [PATCH v2 3/6] x86/mtrr: Fix Xorg crashes in Qemu sessions Borislav Petkov
     [not found]   ` <20160322170047.GD5656@pd.tnic>
2016-03-22 21:53     ` Toshi Kani
     [not found]     ` <1458683610.6393.624.camel@hpe.com>
2016-03-23  8:44       ` Borislav Petkov
     [not found]       ` <20160323084437.GB8031@pd.tnic>
2016-03-23 15:53         ` Toshi Kani
     [not found]         ` <1458748393.6393.653.camel@hpe.com>
2016-03-23 21:47           ` Toshi Kani
     [not found] ` <1458175619-32206-3-git-send-email-toshi.kani@hpe.com>
2016-03-22 17:01   ` [PATCH v2 4/6] x86/mtrr: Fix PAT init handling when MTRR MSR is disabled Borislav Petkov
     [not found]   ` <20160322170135.GE5656@pd.tnic>
2016-03-22 22:02     ` Toshi Kani
     [not found] ` <1458175619-32206-4-git-send-email-toshi.kani@hpe.com>
2016-03-22 17:02   ` Borislav Petkov [this message]
     [not found]   ` <20160322170206.GF5656@pd.tnic>
2016-03-23  6:08     ` [PATCH v2 5/6] x86/xen, pat: Remove PAT table init code from Xen Juergen Gross
     [not found] ` <1458175619-32206-5-git-send-email-toshi.kani@hpe.com>
2016-03-22 17:02   ` [PATCH v2 6/6] x86/pat: Document PAT initializations Borislav Petkov
     [not found]   ` <20160322170222.GG5656@pd.tnic>
2016-03-22 22:15     ` Toshi Kani
     [not found] ` <20160322165944.GC5656@pd.tnic>
2016-03-22 21:40   ` [PATCH v2 2/6] x86/mm/pat: Add pat_disable() interface Toshi Kani
     [not found]   ` <1458682845.6393.614.camel@hpe.com>
2016-03-23  8:51     ` Borislav Petkov
     [not found]     ` <20160323085141.GC8031@pd.tnic>
2016-03-23 15:49       ` Toshi Kani

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