linux-kernel - Re: [PATCH 02/14] x86-64/efi: Use EFI to deal with platform wall clock (again)

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Message-ID: <1387459939.3539.4092.camel@linux-s257.site>
Date:	Thu, 19 Dec 2013 21:32:19 +0800
From:	joeyli <jlee@...e.com>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	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, Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"H. Peter Anvin" <hpa@...or.com>,
	Matt Fleming <matt.fleming@...el.com>
Subject: Re: [PATCH 02/14] x86-64/efi: Use EFI to deal with platform wall
 clock (again)

於 四，2013-12-19 於 10:49 +0000，Matt Fleming 提到：
> On Thu, 19 Dec, at 06:20:16PM, Lee, Chun-Yi wrote:
> > From: Jan Beulich <JBeulich@...e.com>
> > 
> > Other than ix86, x86-64 on EFI so far didn't set the
> > {g,s}et_wallclock accessors to the EFI routines, thus
> > incorrectly using raw RTC accesses instead.
> > 
> > Simply removing the #ifdef around the respective code isn't
> > enough, however: While so far early get-time calls were done in
> > physical mode, this doesn't work properly for x86-64, as virtual
> > addresses would still need to be set up for all runtime regions
> > (which wasn't the case on the system I have access to), so
> > instead the patch moves the call to efi_enter_virtual_mode()
> > ahead (which in turn allows to drop all code related to calling
> > efi-get-time in physical mode).
> > 
> > Additionally the earlier calling of efi_set_executable()
> > requires the CPA code to cope, i.e. during early boot it must be
> > avoided to call cpa_flush_array(), as the first thing this
> > function does is a BUG_ON(irqs_disabled()).
> > 
> > Also make the two EFI functions in question here static -
> > they're not being referenced elsewhere.
> > 
> > History:
> > 
> >     This commit was originally merged as bacef661acdb ("x86-64/efi:
> >     Use EFI to deal with platform wall clock") but it resulted in some
> >     ASUS machines no longer booting due to a firmware bug, and so was
> >     reverted in f026cfa82f62.
> > 
> >     Then a pre-emptive fix for the buggy ASUS firmware was merged in
> >     03a1c254975e ("x86, efi: 1:1 pagetable mapping for virtual EFI
> >     calls") but it causes odd bootup problems on x86-64. So this patch
> >     revoked again by 11520e5e7c1.
> > 
> >     Now Borislav Petkov's "EFI runtime services virtual mapping" is
> >     merged to EFI 'next' branch. So this patch can be reapplied again.
> > 
> > Signed-off-by: Jan Beulich <jbeulich@...e.com>
> > Tested-by: Matt Fleming <matt.fleming@...el.com>
> > Acked-by: Matthew Garrett <mjg@...hat.com>
> > Cc: Ingo Molnar <mingo@...nel.org>
> > Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > Cc: H. Peter Anvin <hpa@...or.com>
> > Signed-off-by: Matt Fleming <matt.fleming@...el.com> [added commit history]
> > Acked-by: Lee, Chun-Yi <jlee@...e.com>
> > ---
> >  arch/x86/mm/pageattr.c      |   10 ++++++----
> >  arch/x86/platform/efi/efi.c |   35 +++++++++++------------------------
> >  include/linux/efi.h         |    2 --
> >  init/main.c                 |    8 ++++----
> >  4 files changed, 21 insertions(+), 34 deletions(-)
> 
> Lee, you can't just simply resend this patch with all the tags - I
> haven't tested this version with any recent changes and I'm pretty sure
> Matthew isn't going to Ack it.

I am very sorry for I didn't remove those tags before send it. I will
remove it when send second version.

> 
> Do you know if anyone has tested this patch with Borislav's recent
> changes?
> 

I tested Borislav's patch set on a issue BIOS and make sure it works,
but I have no chance to test this patch with it. I will find a time to
test it.


Thanks a lot!
Joey Lee

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