From: "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
To: Darren Hart <darren.hart-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: Matthew Garrett
<matthew.garrett-05XSO3Yj/JvQT0dZR+AlfA@public.gmane.org>,
Matt Fleming
<matt-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>,
Josh Triplett <josh-iaAMLnmF4UmaiuxdJuQwMA@public.gmane.org>,
Bryan O'Donoghue
<bryan.odonoghue.lkml-SyKdqv6vbfZdzvEItQ6vdLNAH6kLmebB@public.gmane.org>,
"linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org"
<x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Ingo Molnar <mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
Josh Boyer <jwboyer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Subject: Re: [PATCH] Remove warning in efi_enter_virtual_mode
Date: Thu, 18 Apr 2013 13:13:35 -0700 [thread overview]
Message-ID: <517053EF.2030900@zytor.com> (raw)
In-Reply-To: <51705366.8070001-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
On 04/18/2013 01:11 PM, Darren Hart wrote:
>>
>> I would expect that if there are any 32-bit UEFI systems that ship with
>> BGRT support (and Darren makes it sound like that's a possibility),
>> there's a realistic chance of the BGRT ending up allocated above the
>> highmem barrier.
>
> I can certainly ensure we sit below that barrier on the MinnowBoard. We
> can also speak with the Intel UEFI firmware development teams to see
> about making that a requirement. I don't know if we'll be successful,
> but Matt, Peter, and I have recently coaxed some changes of that nature in.
>
No, that is the wrong approach. The HIGHMEM barrier is a Linux kernel
construct and isn't even guaranteed to be the same from one boot *of the
same kernel* to another. The value 896M is merely the default, but it
can be affected by both compile time and command line options.
-hpa
WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: Darren Hart <darren.hart@intel.com>
Cc: Matthew Garrett <matthew.garrett@nebula.com>,
Matt Fleming <matt@console-pimps.org>,
Josh Triplett <josh@joshtriplett.org>,
"Bryan O'Donoghue" <bryan.odonoghue.lkml@nexus-software.ie>,
"linux-efi@vger.kernel.org" <linux-efi@vger.kernel.org>,
"x86@kernel.org" <x86@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Josh Boyer <jwboyer@redhat.com>
Subject: Re: [PATCH] Remove warning in efi_enter_virtual_mode
Date: Thu, 18 Apr 2013 13:13:35 -0700 [thread overview]
Message-ID: <517053EF.2030900@zytor.com> (raw)
In-Reply-To: <51705366.8070001@intel.com>
On 04/18/2013 01:11 PM, Darren Hart wrote:
>>
>> I would expect that if there are any 32-bit UEFI systems that ship with
>> BGRT support (and Darren makes it sound like that's a possibility),
>> there's a realistic chance of the BGRT ending up allocated above the
>> highmem barrier.
>
> I can certainly ensure we sit below that barrier on the MinnowBoard. We
> can also speak with the Intel UEFI firmware development teams to see
> about making that a requirement. I don't know if we'll be successful,
> but Matt, Peter, and I have recently coaxed some changes of that nature in.
>
No, that is the wrong approach. The HIGHMEM barrier is a Linux kernel
construct and isn't even guaranteed to be the same from one boot *of the
same kernel* to another. The value 896M is merely the default, but it
can be affected by both compile time and command line options.
-hpa
next prev parent reply other threads:[~2013-04-18 20:13 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-16 15:58 [PATCH] Remove warning in efi_enter_virtual_mode Bryan O'Donoghue
2013-04-16 15:58 ` Bryan O'Donoghue
[not found] ` <1366127886-31460-1-git-send-email-bryan.odonoghue.lkml-SyKdqv6vbfZdzvEItQ6vdLNAH6kLmebB@public.gmane.org>
2013-04-17 14:06 ` Matt Fleming
2013-04-17 14:06 ` Matt Fleming
[not found] ` <516EAC4A.6040202-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>
2013-04-17 22:00 ` Bryan O'Donoghue
2013-04-17 22:00 ` Bryan O'Donoghue
[not found] ` <516F1B90.9040508-SyKdqv6vbfZdzvEItQ6vdLNAH6kLmebB@public.gmane.org>
2013-04-18 11:00 ` Matt Fleming
2013-04-18 11:00 ` Matt Fleming
2013-04-18 14:51 ` Darren Hart
[not found] ` <51700876.1000305-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2013-04-18 16:19 ` Matt Fleming
2013-04-18 16:19 ` Matt Fleming
2013-04-19 0:18 ` Darren Hart
[not found] ` <51708D3D.9010707-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2013-04-19 7:50 ` Matt Fleming
2013-04-19 7:50 ` Matt Fleming
[not found] ` <5170F736.2060803-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>
2013-04-19 12:01 ` Josh Boyer
2013-04-19 12:01 ` Josh Boyer
2013-09-10 17:43 ` Darren Hart
2013-09-10 17:43 ` Darren Hart
[not found] ` <1378835007.19978.125.camel-d05DLm829JQHkdubuh725LKMmGWinSIL2HeeBUIffwg@public.gmane.org>
2013-09-12 7:55 ` Matt Fleming
2013-09-12 7:55 ` Matt Fleming
[not found] ` <20130912075500.GC895-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>
2013-09-12 22:30 ` Darren Hart
2013-09-12 22:30 ` Darren Hart
2013-04-18 16:33 ` Josh Triplett
2013-04-18 16:38 ` H. Peter Anvin
2013-04-18 16:38 ` H. Peter Anvin
2013-04-18 16:44 ` Josh Triplett
2013-04-18 19:55 ` Matt Fleming
2013-04-18 19:55 ` Matt Fleming
[not found] ` <51704FA8.7060801-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>
2013-04-18 19:57 ` H. Peter Anvin
2013-04-18 19:57 ` H. Peter Anvin
2013-04-18 19:58 ` Matthew Garrett
2013-04-18 19:58 ` Matthew Garrett
[not found] ` <1366315083.13667.19.camel-+5W/JHIUVxg@public.gmane.org>
2013-04-18 20:11 ` Darren Hart
2013-04-18 20:11 ` Darren Hart
[not found] ` <51705366.8070001-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2013-04-18 20:13 ` H. Peter Anvin [this message]
2013-04-18 20:13 ` H. Peter Anvin
[not found] ` <517053EF.2030900-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2013-04-18 20:17 ` Darren Hart
2013-04-18 20:17 ` Darren Hart
[not found] ` <517054EF.9070500-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2013-04-18 20:45 ` H. Peter Anvin
2013-04-18 20:45 ` H. Peter Anvin
[not found] ` <516FD24A.3070502-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>
2013-04-18 13:40 ` Josh Boyer
2013-04-18 13:40 ` Josh Boyer
[not found] ` <20130418134059.GF18383-dHPIJuKSOV01V+h/cAXI7w8O6CCKKCg3HZ5vskTnxNA@public.gmane.org>
2013-04-18 15:01 ` Matthew Garrett
2013-04-18 15:01 ` Matthew Garrett
[not found] ` <1366297271.13667.14.camel-+5W/JHIUVxg@public.gmane.org>
2013-04-18 15:17 ` Josh Boyer
2013-04-18 15:17 ` Josh Boyer
2013-04-18 22:07 ` Bryan O'Donoghue
2013-04-18 22:07 ` Bryan O'Donoghue
[not found] ` <51706E8A.7030909-SyKdqv6vbfZdzvEItQ6vdLNAH6kLmebB@public.gmane.org>
2013-04-18 23:01 ` Josh Triplett
2013-04-18 23:01 ` Josh Triplett
2013-04-18 23:44 ` H. Peter Anvin
2013-04-18 23:44 ` H. Peter Anvin
2013-04-18 23:42 ` H. Peter Anvin
2013-04-18 23:42 ` H. Peter Anvin
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