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From: Ard Biesheuvel <ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
To: Matt Fleming <matt-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>
Cc: "linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
	<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
	"linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Leif Lindholm
	<leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	Roy Franz <roy.franz-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
	Catalin Marinas <catalin.marinas-5wv7dgnIgG8@public.gmane.org>,
	Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>,
	Matt Fleming
	<matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
	Borislav Petkov <bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org>,
	Dave Young <dyoung-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Mark Salter <msalter-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Grant Likely
	<grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Subject: Re: [PATCH 2/8] arm64/efi: register UEFI reserved regions as iomem resources
Date: Wed, 7 Jan 2015 11:53:38 +0000	[thread overview]
Message-ID: <CAKv+Gu9T0yQXGMSj_+=f7v54OO=1YqAKi0s0m3Vj0Y0Ea---1A@mail.gmail.com> (raw)
In-Reply-To: <20150106091322.GG3163-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>

On 6 January 2015 at 09:13, Matt Fleming <matt-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org> wrote:
> On Mon, 22 Dec, at 07:08:36PM, Ard Biesheuvel wrote:
>> To prevent device drivers from attaching to device or memory regions
>> owned by the firmware, register all UEFI reserved regions in the iomem
>> resource table at init time.
>>
>> Signed-off-by: Ard Biesheuvel <ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
>> ---
>>  arch/arm64/kernel/efi.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
>>  1 file changed, 46 insertions(+)
>
> Looks nice.
>
> Just curious, have you actually seen drivers trying to claim these
> regions?
>

Yes. RTC and NOR flash in particular, which should not appear in the
device tree in the first place if the firmware owns them, but let's
not assume all firmware vendors will get that right first try,

WARNING: multiple messages have this Message-ID (diff)
From: ard.biesheuvel@linaro.org (Ard Biesheuvel)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/8] arm64/efi: register UEFI reserved regions as iomem resources
Date: Wed, 7 Jan 2015 11:53:38 +0000	[thread overview]
Message-ID: <CAKv+Gu9T0yQXGMSj_+=f7v54OO=1YqAKi0s0m3Vj0Y0Ea---1A@mail.gmail.com> (raw)
In-Reply-To: <20150106091322.GG3163@console-pimps.org>

On 6 January 2015 at 09:13, Matt Fleming <matt@console-pimps.org> wrote:
> On Mon, 22 Dec, at 07:08:36PM, Ard Biesheuvel wrote:
>> To prevent device drivers from attaching to device or memory regions
>> owned by the firmware, register all UEFI reserved regions in the iomem
>> resource table at init time.
>>
>> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
>> ---
>>  arch/arm64/kernel/efi.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
>>  1 file changed, 46 insertions(+)
>
> Looks nice.
>
> Just curious, have you actually seen drivers trying to claim these
> regions?
>

Yes. RTC and NOR flash in particular, which should not appear in the
device tree in the first place if the firmware owns them, but let's
not assume all firmware vendors will get that right first try,

  parent reply	other threads:[~2015-01-07 11:53 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-12-22 19:08 [PATCH 0/8] arm64: improved memory map handling for /dev/mem, ACPI etc Ard Biesheuvel
2014-12-22 19:08 ` Ard Biesheuvel
     [not found] ` <1419275322-29811-1-git-send-email-ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2014-12-22 19:08   ` [PATCH 1/8] arm64/efi: use UEFI memory map unconditionally if available Ard Biesheuvel
2014-12-22 19:08     ` Ard Biesheuvel
     [not found]     ` <1419275322-29811-2-git-send-email-ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-01-06  9:04       ` Matt Fleming
2015-01-06  9:04         ` Matt Fleming
     [not found]         ` <20150106090407.GF3163-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>
2015-01-07 11:48           ` Ard Biesheuvel
2015-01-07 11:48             ` Ard Biesheuvel
     [not found]             ` <CAKv+Gu_q5wFhjb8M7VptVtHfm5vfp6_YiqN_XoTs9qV5=8OOdg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-01-12 10:46               ` Matt Fleming
2015-01-12 10:46                 ` Matt Fleming
2015-01-09 15:41       ` Will Deacon
2015-01-09 15:41         ` Will Deacon
2014-12-22 19:08   ` [PATCH 2/8] arm64/efi: register UEFI reserved regions as iomem resources Ard Biesheuvel
2014-12-22 19:08     ` Ard Biesheuvel
     [not found]     ` <1419275322-29811-3-git-send-email-ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-01-06  9:13       ` Matt Fleming
2015-01-06  9:13         ` Matt Fleming
     [not found]         ` <20150106091322.GG3163-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>
2015-01-07 11:53           ` Ard Biesheuvel [this message]
2015-01-07 11:53             ` Ard Biesheuvel
2014-12-22 19:08   ` [PATCH 3/8] memblock: add physmem to memblock_dump_all() output Ard Biesheuvel
2014-12-22 19:08     ` Ard Biesheuvel
2015-01-06  9:15     ` Matt Fleming
2015-01-06  9:15       ` Matt Fleming
2015-01-06  9:15       ` Matt Fleming
2014-12-22 19:08   ` [PATCH 4/8] memblock: introduce memblock_add_phys() and memblock_is_physmem() Ard Biesheuvel
2014-12-22 19:08     ` Ard Biesheuvel
2015-01-06  9:19     ` Matt Fleming
2015-01-06  9:19       ` Matt Fleming
2015-01-06  9:19       ` Matt Fleming
2014-12-22 19:08   ` [PATCH 5/8] of: fdt: register physmem in early_init_dt_scan_memory() Ard Biesheuvel
2014-12-22 19:08     ` Ard Biesheuvel
2014-12-22 19:08   ` [PATCH 6/8] arm64/efi: register physmem in reserve_regions() Ard Biesheuvel
2014-12-22 19:08     ` Ard Biesheuvel
2014-12-22 19:08   ` [PATCH 7/8] arm64: use 'physmem' memblock to improve CONFIG_STRICT_DEVMEM handling Ard Biesheuvel
2014-12-22 19:08     ` Ard Biesheuvel
     [not found]     ` <1419275322-29811-8-git-send-email-ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-01-09 15:38       ` Will Deacon
2015-01-09 15:38         ` Will Deacon
2014-12-22 19:08   ` [PATCH 8/8] arm64/efi: memblock_remove rather than _reserve UEFI reserved RAM Ard Biesheuvel
2014-12-22 19:08     ` Ard Biesheuvel
2014-12-26  9:35   ` [PATCH 0/8] arm64: improved memory map handling for /dev/mem, ACPI etc Dave Young
2014-12-26  9:35     ` Dave Young
     [not found]     ` <20141226093528.GA26133-4/PLUo9XfK/1wF9wiOj0lkEOCMrvLtNR@public.gmane.org>
2014-12-29  9:22       ` Ard Biesheuvel
2014-12-29  9:22         ` Ard Biesheuvel
     [not found]         ` <CAKv+Gu_1VCJK7y5U9H-mhjjN6AFW8+SGvbKUZfuzx6qGEpVg0A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-12-30  9:25           ` Dave Young
2014-12-30  9:25             ` Dave Young
     [not found]             ` <20141230092514.GF2457-4/PLUo9XfK/1wF9wiOj0lkEOCMrvLtNR@public.gmane.org>
2014-12-30 13:21               ` Ard Biesheuvel
2014-12-30 13:21                 ` Ard Biesheuvel
     [not found]                 ` <CAKv+Gu_Ou6Fv7-AUcpbUJAijwEJ8=PCB1mQU3mCfctLFAMhu_w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-01-04  8:19                   ` Dave Young
2015-01-04  8:19                     ` Dave Young
     [not found]                     ` <20150104081905.GA6231-4/PLUo9XfK/1wF9wiOj0lkEOCMrvLtNR@public.gmane.org>
2015-01-05  9:18                       ` Ard Biesheuvel
2015-01-05  9:18                         ` Ard Biesheuvel
     [not found]                         ` <CAKv+Gu-P7AeMNveZMe814FgrEr_z26vaYKWa=borKoPSc76Y6g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-01-06  8:16                           ` Dave Young
2015-01-06  8:16                             ` Dave Young
     [not found]                             ` <20150106081635.GE2113-4/PLUo9XfK/1wF9wiOj0lkEOCMrvLtNR@public.gmane.org>
2015-01-07 11:41                               ` Ard Biesheuvel
2015-01-07 11:41                                 ` Ard Biesheuvel
     [not found]                                 ` <CAKv+Gu9DQLZnvNyF0qdk5jSH6=NvdsKYTX+E46U=kGRzCEfwHg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-01-08  1:29                                   ` Dave Young
2015-01-08  1:29                                     ` Dave Young

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