linux-kernel - Re: [Xen-devel] RIP MTRR - status update for upcoming v4.2

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Message-ID: <CAB=NE6WvaY4p7O3=0MMjWO44AytNYFr6xRsvVmVWDns9qdYZ8Q@mail.gmail.com>
Date:	Thu, 6 Aug 2015 12:55:48 -0700
From:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
To:	Toshi Kani <toshi.kani@...com>
Cc:	Jan Beulich <JBeulich@...e.com>,
	Andy Lutomirski <luto@...capital.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jej B <James.Bottomley@...senpartnership.com>,
	X86 ML <x86@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ville Syrjälä <ville.syrjala@...ux.intel.com>,
	Julia Lawall <julia.lawall@...6.fr>,
	xen-devel@...ts.xenproject.org, Dave Airlie <airlied@...hat.com>,
	Ville Syrjälä <syrjala@....fi>,
	Juergen Gross <JGross@...e.com>, Borislav Petkov <bp@...e.de>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	linux-fbdev <linux-fbdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-media@...r.kernel.org,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [Xen-devel] RIP MTRR - status update for upcoming v4.2

On Thu, Aug 6, 2015 at 12:53 PM, Luis R. Rodriguez
<mcgrof@...not-panic.com> wrote:
> For those type of OSes...
> could it be possible to negotiate or hint to the platform through an
> attribute somehow that the OS has such capability to not use MTRR?

And if that's not possible how about a new platform setting that would
need to be set at the platform level to enable disabling this junk?
Then only folks who know what they are doing would enable it, and if
the customer set it, the issue would not be on the platform.

 Luis
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