linux-kernel - Re: [RFT][PATCH] ACPI / init: Run acpi_early_init() before efi_enter_virtual_mode() (was: Re: [RFC PATCH 00/14] Support timezone of ACPI TAD and EFI TIME)

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Message-ID: <20140112110546.GB25180@console-pimps.org>
Date:	Sun, 12 Jan 2014 11:05:46 +0000
From:	Matt Fleming <matt@...sole-pimps.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	"H. Peter Anvin" <hpa@...or.com>, joeyli <jlee@...e.com>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Matthew Garrett <matthew.garrett@...ula.com>, Elliott@...com,
	samer.el-haj-mahmoud@...com, Oliver Neukum <oneukum@...e.de>,
	werner@...e.com, trenn@...e.de, JBeulich@...e.com,
	linux-kernel@...r.kernel.org, rtc-linux@...glegroups.com,
	x86@...nel.org,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	linux-acpi@...r.kernel.org, Borislav Petkov <bp@...e.de>
Subject: Re: [RFT][PATCH] ACPI / init: Run acpi_early_init() before
 efi_enter_virtual_mode() (was: Re: [RFC PATCH 00/14] Support timezone of
 ACPI TAD and EFI TIME)

On Sun, 12 Jan, at 01:30:23AM, Rafael J. Wysocki wrote:
> On Saturday, December 21, 2013 12:21:48 PM Matt Fleming wrote:
> > On Fri, 20 Dec, at 11:18:56PM, Rafael J. Wysocki wrote:
> > > 
> > > I'm not sure 100%, but I *think* we need to do that with interrupts enabled.
> > > At least after mm_init(), because it relies on things initialized there if I
> > > remember correctly.
> > > 
> > > From what I can tell at the moment, it might be possible to move it before
> > > efi_enter_virtual_mode() if that would help.
> > 
> > Actually yeah, that would be super useful, and I think we'd be able to
> > get rid of the whole efi_late_init() stuff because we'd no longer need
> > to hang on to the EFI_BOOT_SERVICES* regions after
> > SetVirtualAddressMap().
> 
> OK
> 
> I don't see any adverse effects of the patch below on a couple of my test
> boxes, but (a) they are Intel-based and (b) they are non-EFI, so it would be
> good to give it a go on as many machines as reasonably possible.

Thanks Rafael, I'll give this a spin on my test machines here.

-- 
Matt Fleming, Intel Open Source Technology Center
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