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From: Hector Martin <marcan@marcan.st>
To: Mark Kettenis <mark.kettenis@xs4all.nl>
Cc: krzysztof.kozlowski@canonical.com,
	linux-arm-kernel@lists.infradead.org, maz@kernel.org,
	robh@kernel.org, arnd@kernel.org, olof@lixom.net,
	tony@atomide.com, mohamed.mediouni@caramail.com,
	stan@corellium.com, graf@amazon.com, will@kernel.org,
	linus.walleij@linaro.org, mark.rutland@arm.com,
	andy.shevchenko@gmail.com, gregkh@linuxfoundation.org,
	corbet@lwn.net, catalin.marinas@arm.com, hch@infradead.org,
	davem@davemloft.net, devicetree@vger.kernel.org,
	linux-serial@vger.kernel.org, linux-doc@vger.kernel.org,
	linux-samsung-soc@vger.kernel.org, linux-arch@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [RFT PATCH v3 27/27] arm64: apple: Add initial Apple Mac mini (M1, 2020) devicetree
Date: Sat, 6 Mar 2021 01:50:20 +0900	[thread overview]
Message-ID: <b81d3316-060a-8d52-b921-cfd8884d0895@marcan.st> (raw)
In-Reply-To: <c1bc827f65e47744@bloch.sibelius.xs4all.nl>

On 06/03/2021 00.59, Mark Kettenis wrote:
> It may be better to handle the memory reserved by the firmware using a
> "/reserved-memory" node.  I think the benefit of that could be that it
> communicates the entire range of physical memory to the kernel, which
> means it could use large mappings in the page tables.  Unless the
> "/reserved-memory" node defines a region that has the "no-map"
> property of course.

We actually need no-map, because otherwise the CPU could speculate its 
way into these carveouts (it's not just firmware, there's stuff in here 
the CPU really can't be allowed to touch, e.g. the SEP carveout). It 
also breaks simplefb mapping the framebuffer. I thought of the 
reserved-memory approach, but then figured it wouldn't buy us anything 
for this reason.

-- 
Hector Martin (marcan@marcan.st)
Public Key: https://mrcn.st/pub

WARNING: multiple messages have this Message-ID
From: Hector Martin <marcan@marcan.st>
To: Mark Kettenis <mark.kettenis@xs4all.nl>
Cc: krzysztof.kozlowski@canonical.com,
	linux-arm-kernel@lists.infradead.org, maz@kernel.org,
	robh@kernel.org, arnd@kernel.org, olof@lixom.net,
	tony@atomide.com, mohamed.mediouni@caramail.com,
	stan@corellium.com, graf@amazon.com, will@kernel.org,
	linus.walleij@linaro.org, mark.rutland@arm.com,
	andy.shevchenko@gmail.com, gregkh@linuxfoundation.org,
	corbet@lwn.net, catalin.marinas@arm.com, hch@infradead.org,
	davem@davemloft.net, devicetree@vger.kernel.org,
	linux-serial@vger.kernel.org, linux-doc@vger.kernel.org,
	linux-samsung-soc@vger.kernel.org, linux-arch@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [RFT PATCH v3 27/27] arm64: apple: Add initial Apple Mac mini (M1, 2020) devicetree
Date: Sat, 6 Mar 2021 01:50:20 +0900	[thread overview]
Message-ID: <b81d3316-060a-8d52-b921-cfd8884d0895@marcan.st> (raw)
In-Reply-To: <c1bc827f65e47744@bloch.sibelius.xs4all.nl>

On 06/03/2021 00.59, Mark Kettenis wrote:
> It may be better to handle the memory reserved by the firmware using a
> "/reserved-memory" node.  I think the benefit of that could be that it
> communicates the entire range of physical memory to the kernel, which
> means it could use large mappings in the page tables.  Unless the
> "/reserved-memory" node defines a region that has the "no-map"
> property of course.

We actually need no-map, because otherwise the CPU could speculate its 
way into these carveouts (it's not just firmware, there's stuff in here 
the CPU really can't be allowed to touch, e.g. the SEP carveout). It 
also breaks simplefb mapping the framebuffer. I thought of the 
reserved-memory approach, but then figured it wouldn't buy us anything 
for this reason.

-- 
Hector Martin (marcan@marcan.st)
Public Key: https://mrcn.st/pub

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2021-03-05 16:51 UTC|newest]

Thread overview: 275+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-04 21:38 [RFT PATCH v3 00/27] Apple M1 SoC platform bring-up Hector Martin
2021-03-04 21:38 ` Hector Martin
2021-03-04 21:38 ` [RFT PATCH v3 01/27] arm64: Cope with CPUs stuck in VHE mode Hector Martin
2021-03-04 21:38   ` Hector Martin
2021-03-24 18:05   ` Will Deacon
2021-03-24 18:05     ` Will Deacon
2021-03-24 20:00     ` Marc Zyngier
2021-03-24 20:00       ` Marc Zyngier
2021-03-26  7:54       ` Hector Martin
2021-03-26  7:54         ` Hector Martin
2021-03-04 21:38 ` [RFT PATCH v3 02/27] dt-bindings: vendor-prefixes: Add apple prefix Hector Martin
2021-03-04 21:38   ` Hector Martin
2021-03-08 20:26   ` Rob Herring
2021-03-08 20:26     ` Rob Herring
2021-03-04 21:38 ` [RFT PATCH v3 03/27] dt-bindings: arm: apple: Add bindings for Apple ARM platforms Hector Martin
2021-03-04 21:38   ` Hector Martin
2021-03-05 10:16   ` Linus Walleij
2021-03-05 10:16     ` Linus Walleij
2021-03-08 20:27   ` Rob Herring
2021-03-08 20:27     ` Rob Herring
2021-03-04 21:38 ` [RFT PATCH v3 04/27] dt-bindings: arm: cpus: Add apple,firestorm & icestorm compatibles Hector Martin
2021-03-04 21:38   ` [RFT PATCH v3 04/27] dt-bindings: arm: cpus: Add apple, firestorm " Hector Martin
2021-03-08 20:27   ` [RFT PATCH v3 04/27] dt-bindings: arm: cpus: Add apple,firestorm " Rob Herring
2021-03-08 20:27     ` [RFT PATCH v3 04/27] dt-bindings: arm: cpus: Add apple, firestorm " Rob Herring
2021-03-04 21:38 ` [RFT PATCH v3 05/27] arm64: cputype: Add CPU implementor & types for the Apple M1 cores Hector Martin
2021-03-04 21:38   ` Hector Martin
2021-03-24 18:13   ` Will Deacon
2021-03-24 18:13     ` Will Deacon
2021-03-04 21:38 ` [RFT PATCH v3 06/27] dt-bindings: timer: arm,arch_timer: Add interrupt-names support Hector Martin
2021-03-04 21:38   ` [RFT PATCH v3 06/27] dt-bindings: timer: arm, arch_timer: " Hector Martin
2021-03-05 10:18   ` [RFT PATCH v3 06/27] dt-bindings: timer: arm,arch_timer: " Linus Walleij
2021-03-05 10:18     ` Linus Walleij
2021-03-08 11:12   ` Marc Zyngier
2021-03-08 11:12     ` [RFT PATCH v3 06/27] dt-bindings: timer: arm, arch_timer: " Marc Zyngier
2021-03-08 17:14   ` [RFT PATCH v3 06/27] dt-bindings: timer: arm,arch_timer: " Tony Lindgren
2021-03-08 17:14     ` Tony Lindgren
2021-03-08 20:38   ` Rob Herring
2021-03-08 20:38     ` Rob Herring
2021-03-08 22:42     ` Marc Zyngier
2021-03-08 22:42       ` [RFT PATCH v3 06/27] dt-bindings: timer: arm, arch_timer: " Marc Zyngier
2021-03-09 16:11       ` [RFT PATCH v3 06/27] dt-bindings: timer: arm,arch_timer: " Rob Herring
2021-03-09 16:11         ` Rob Herring
2021-03-09 20:28         ` Hector Martin
2021-03-09 20:28           ` Hector Martin
2021-03-04 21:38 ` [RFT PATCH v3 07/27] arm64: arch_timer: implement support for interrupt-names Hector Martin
2021-03-04 21:38   ` Hector Martin
2021-03-05 10:19   ` Linus Walleij
2021-03-05 10:19     ` Linus Walleij
2021-03-08 11:13   ` Marc Zyngier
2021-03-08 11:13     ` Marc Zyngier
2021-03-04 21:38 ` [RFT PATCH v3 08/27] asm-generic/io.h: Add a non-posted variant of ioremap() Hector Martin
2021-03-04 21:38   ` Hector Martin
2021-03-05 14:45   ` Andy Shevchenko
2021-03-05 14:45     ` Andy Shevchenko
2021-03-05 15:19     ` Hector Martin
2021-03-05 15:19       ` Hector Martin
2021-03-08 11:20   ` Marc Zyngier
2021-03-08 11:20     ` Marc Zyngier
2021-03-24 18:12   ` Will Deacon
2021-03-24 18:12     ` Will Deacon
2021-03-24 19:09     ` Arnd Bergmann
2021-03-24 19:09       ` Arnd Bergmann
2021-03-25 14:07       ` Hector Martin
2021-03-25 14:07         ` Hector Martin
2021-03-25 14:49         ` Will Deacon
2021-03-25 14:49           ` Will Deacon
2021-03-04 21:38 ` [RFT PATCH v3 09/27] docs: driver-api: device-io: Document I/O access functions Hector Martin
2021-03-04 21:38   ` Hector Martin
2021-03-05 10:22   ` Linus Walleij
2021-03-05 10:22     ` Linus Walleij
2021-03-04 21:38 ` [RFT PATCH v3 10/27] docs: driver-api: device-io: Document ioremap() variants & access funcs Hector Martin
2021-03-04 21:38   ` Hector Martin
2021-03-05 10:25   ` Linus Walleij
2021-03-05 10:25     ` Linus Walleij
2021-03-05 15:09     ` Andy Shevchenko
2021-03-05 15:09       ` Andy Shevchenko
2021-03-05 15:51       ` Arnd Bergmann
2021-03-05 15:51         ` Arnd Bergmann
2021-03-09 20:29         ` Hector Martin
2021-03-09 20:29           ` Hector Martin
2021-03-04 21:38 ` [RFT PATCH v3 11/27] arm64: Implement ioremap_np() to map MMIO as nGnRnE Hector Martin
2021-03-04 21:38   ` Hector Martin
2021-03-08 11:22   ` Marc Zyngier
2021-03-08 11:22     ` Marc Zyngier
2021-03-24 18:18   ` Will Deacon
2021-03-24 18:18     ` Will Deacon
2021-03-04 21:38 ` [RFT PATCH v3 12/27] of/address: Add infrastructure to declare MMIO as non-posted Hector Martin
2021-03-04 21:38   ` Hector Martin
2021-03-05 10:28   ` Linus Walleij
2021-03-05 10:28     ` Linus Walleij
2021-03-05 15:13   ` Andy Shevchenko
2021-03-05 15:13     ` Andy Shevchenko
2021-03-05 15:55     ` Hector Martin
2021-03-05 15:55       ` Hector Martin
2021-03-05 16:08       ` Andy Shevchenko
2021-03-05 16:08         ` Andy Shevchenko
2021-03-05 16:43         ` Arnd Bergmann
2021-03-05 16:43           ` Arnd Bergmann
2021-03-05 17:19           ` Hector Martin
2021-03-05 17:19             ` Hector Martin
2021-03-05 16:05     ` Rob Herring
2021-03-05 16:05       ` Rob Herring
2021-03-05 17:39   ` Rob Herring
2021-03-05 17:39     ` Rob Herring
2021-03-05 18:18     ` Hector Martin
2021-03-05 18:18       ` Hector Martin
2021-03-05 21:17       ` Arnd Bergmann
2021-03-05 21:17         ` Arnd Bergmann
2021-03-08 15:56         ` Rob Herring
2021-03-08 15:56           ` Rob Herring
2021-03-08 20:29           ` Arnd Bergmann
2021-03-08 20:29             ` Arnd Bergmann
2021-03-08 21:13             ` Rob Herring
2021-03-08 21:13               ` Rob Herring
2021-03-08 21:56               ` Arnd Bergmann
2021-03-08 21:56                 ` Arnd Bergmann
2021-03-09 15:48                 ` Rob Herring
2021-03-09 15:48                   ` Rob Herring
2021-03-09 20:23                   ` Hector Martin
2021-03-09 20:23                     ` Hector Martin
2021-03-09 22:06                     ` Rob Herring
2021-03-09 22:06                       ` Rob Herring
2021-03-10  8:26                       ` Hector Martin
2021-03-10  8:26                         ` Hector Martin
2021-03-10 17:01                         ` Rob Herring
2021-03-10 17:01                           ` Rob Herring
2021-03-11  9:12                           ` Arnd Bergmann
2021-03-11  9:12                             ` Arnd Bergmann
2021-03-11 12:11                             ` Hector Martin
2021-03-11 12:11                               ` Hector Martin
2021-03-11 13:35                               ` Arnd Bergmann
2021-03-11 13:35                                 ` Arnd Bergmann
2021-03-11 16:07                             ` Rob Herring
2021-03-11 16:07                               ` Rob Herring
2021-03-11 16:48                               ` Arnd Bergmann
2021-03-11 16:48                                 ` Arnd Bergmann
2021-03-11 18:10                                 ` Rob Herring
2021-03-11 18:10                                   ` Rob Herring
2021-03-12 10:20                                   ` Arnd Bergmann
2021-03-12 10:20                                     ` Arnd Bergmann
2021-03-09 11:14               ` Linus Walleij
2021-03-09 11:14                 ` Linus Walleij
2021-03-09 12:41                 ` Arnd Bergmann
2021-03-09 12:41                   ` Arnd Bergmann
2021-03-09 15:40                   ` Linus Walleij
2021-03-09 15:40                     ` Linus Walleij
2021-03-04 21:38 ` [RFT PATCH v3 13/27] arm64: Add Apple vendor-specific system registers Hector Martin
2021-03-04 21:38   ` Hector Martin
2021-03-24 18:38   ` Will Deacon
2021-03-24 18:38     ` Will Deacon
2021-03-24 18:59     ` Mark Rutland
2021-03-24 18:59       ` Mark Rutland
2021-03-24 19:04       ` Will Deacon
2021-03-24 19:04         ` Will Deacon
2021-03-26  6:23         ` Hector Martin
2021-03-26  6:23           ` Hector Martin
2021-03-04 21:38 ` [RFT PATCH v3 14/27] arm64: move ICH_ sysreg bits from arm-gic-v3.h to sysreg.h Hector Martin
2021-03-04 21:38   ` Hector Martin
2021-03-08 11:39   ` Marc Zyngier
2021-03-08 11:39     ` Marc Zyngier
2021-03-24 18:23   ` Will Deacon
2021-03-24 18:23     ` Will Deacon
2021-03-04 21:38 ` [RFT PATCH v3 15/27] dt-bindings: interrupt-controller: Add DT bindings for apple-aic Hector Martin
2021-03-04 21:38   ` Hector Martin
2021-03-08 21:16   ` Rob Herring
2021-03-08 21:16     ` Rob Herring
2021-03-04 21:38 ` [RFT PATCH v3 16/27] irqchip/apple-aic: Add support for the Apple Interrupt Controller Hector Martin
2021-03-04 21:38   ` Hector Martin
2021-03-05 15:05   ` Andy Shevchenko
2021-03-05 15:05     ` Andy Shevchenko
2021-03-08 11:50     ` Marc Zyngier
2021-03-08 11:50       ` Marc Zyngier
2021-03-08 12:02       ` Andy Shevchenko
2021-03-08 12:02         ` Andy Shevchenko
2021-03-26 13:40     ` Hector Martin
2021-03-26 13:40       ` Hector Martin
2021-03-08 13:31   ` Marc Zyngier
2021-03-08 13:31     ` Marc Zyngier
2021-03-26  7:57     ` Hector Martin
2021-03-26  7:57       ` Hector Martin
2021-03-24 19:57   ` Will Deacon
2021-03-24 19:57     ` Will Deacon
2021-03-26  8:58     ` Hector Martin
2021-03-26  8:58       ` Hector Martin
2021-03-29 12:04       ` Will Deacon
2021-03-29 12:04         ` Will Deacon
2021-04-01 13:16         ` Hector Martin
2021-04-01 13:16           ` Hector Martin
2021-03-04 21:38 ` [RFT PATCH v3 17/27] arm64: Kconfig: Introduce CONFIG_ARCH_APPLE Hector Martin
2021-03-04 21:38   ` Hector Martin
2021-03-08 15:35   ` Marc Zyngier
2021-03-08 15:35     ` Marc Zyngier
2021-03-09 20:30     ` Hector Martin
2021-03-09 20:30       ` Hector Martin
2021-03-04 21:38 ` [RFT PATCH v3 18/27] tty: serial: samsung_tty: Separate S3C64XX ops structure Hector Martin
2021-03-04 21:38   ` Hector Martin
2021-03-05 10:30   ` Krzysztof Kozlowski
2021-03-05 10:30     ` Krzysztof Kozlowski
2021-03-04 21:38 ` [RFT PATCH v3 19/27] tty: serial: samsung_tty: Add ucon_mask parameter Hector Martin
2021-03-04 21:38   ` Hector Martin
2021-03-05 10:34   ` Krzysztof Kozlowski
2021-03-05 10:34     ` Krzysztof Kozlowski
2021-03-04 21:38 ` [RFT PATCH v3 20/27] tty: serial: samsung_tty: Add s3c24xx_port_type Hector Martin
2021-03-04 21:38   ` Hector Martin
2021-03-05 10:49   ` Krzysztof Kozlowski
2021-03-05 10:49     ` Krzysztof Kozlowski
2021-03-04 21:38 ` [RFT PATCH v3 21/27] tty: serial: samsung_tty: IRQ rework Hector Martin
2021-03-04 21:38   ` Hector Martin
2021-03-05 10:51   ` Krzysztof Kozlowski
2021-03-05 10:51     ` Krzysztof Kozlowski
2021-03-05 15:17   ` Andy Shevchenko
2021-03-05 15:17     ` Andy Shevchenko
2021-03-05 16:16     ` Hector Martin
2021-03-05 16:16       ` Hector Martin
2021-03-05 16:20       ` Andy Shevchenko
2021-03-05 16:20         ` Andy Shevchenko
2021-03-05 16:29         ` Hector Martin
2021-03-05 16:29           ` Hector Martin
2021-03-07 11:34           ` Krzysztof Kozlowski
2021-03-07 11:34             ` Krzysztof Kozlowski
2021-03-07 16:01             ` Arnd Bergmann
2021-03-07 16:01               ` Arnd Bergmann
2021-03-07 19:51               ` Krzysztof Kozlowski
2021-03-07 19:51                 ` Krzysztof Kozlowski
2021-03-04 21:38 ` [RFT PATCH v3 22/27] tty: serial: samsung_tty: Use devm_ioremap_resource Hector Martin
2021-03-04 21:38   ` Hector Martin
2021-03-05 10:54   ` Krzysztof Kozlowski
2021-03-05 10:54     ` Krzysztof Kozlowski
2021-03-05 15:19     ` Andy Shevchenko
2021-03-05 15:19       ` Andy Shevchenko
2021-03-04 21:38 ` [RFT PATCH v3 23/27] dt-bindings: serial: samsung: Add apple,s5l-uart compatible Hector Martin
2021-03-04 21:38   ` [RFT PATCH v3 23/27] dt-bindings: serial: samsung: Add apple, s5l-uart compatible Hector Martin
2021-03-08 21:17   ` [RFT PATCH v3 23/27] dt-bindings: serial: samsung: Add apple,s5l-uart compatible Rob Herring
2021-03-08 21:17     ` Rob Herring
2021-03-04 21:38 ` [RFT PATCH v3 24/27] tty: serial: samsung_tty: Add support for Apple UARTs Hector Martin
2021-03-04 21:38   ` Hector Martin
2021-03-05 10:58   ` Krzysztof Kozlowski
2021-03-05 10:58     ` Krzysztof Kozlowski
2021-03-05 15:28   ` Andy Shevchenko
2021-03-05 15:28     ` Andy Shevchenko
2021-03-05 17:04     ` Hector Martin
2021-03-05 17:04       ` Hector Martin
2021-03-07 11:40       ` Krzysztof Kozlowski
2021-03-07 11:40         ` Krzysztof Kozlowski
2021-03-04 21:39 ` [RFT PATCH v3 25/27] tty: serial: samsung_tty: Add earlycon " Hector Martin
2021-03-04 21:39   ` Hector Martin
2021-03-05 10:55   ` Krzysztof Kozlowski
2021-03-05 10:55     ` Krzysztof Kozlowski
2021-03-10 23:11   ` Linus Walleij
2021-03-10 23:11     ` Linus Walleij
2021-03-04 21:39 ` [RFT PATCH v3 26/27] dt-bindings: display: Add apple,simple-framebuffer Hector Martin
2021-03-04 21:39   ` [RFT PATCH v3 26/27] dt-bindings: display: Add apple, simple-framebuffer Hector Martin
2021-03-08 21:18   ` [RFT PATCH v3 26/27] dt-bindings: display: Add apple,simple-framebuffer Rob Herring
2021-03-08 21:18     ` Rob Herring
2021-03-09 16:37   ` Linus Walleij
2021-03-09 16:37     ` [RFT PATCH v3 26/27] dt-bindings: display: Add apple, simple-framebuffer Linus Walleij
2021-03-09 20:35     ` [RFT PATCH v3 26/27] dt-bindings: display: Add apple,simple-framebuffer Hector Martin
2021-03-09 20:35       ` Hector Martin
2021-03-04 21:39 ` [RFT PATCH v3 27/27] arm64: apple: Add initial Apple Mac mini (M1, 2020) devicetree Hector Martin
2021-03-04 21:39   ` Hector Martin
2021-03-05 11:03   ` Krzysztof Kozlowski
2021-03-05 11:03     ` Krzysztof Kozlowski
2021-03-05 11:14     ` Hector Martin
2021-03-05 11:14       ` Hector Martin
2021-03-05 11:45       ` Krzysztof Kozlowski
2021-03-05 11:45         ` Krzysztof Kozlowski
2021-03-05 15:59       ` Mark Kettenis
2021-03-05 15:59         ` Mark Kettenis
2021-03-05 16:50         ` Hector Martin [this message]
2021-03-05 16:50           ` Hector Martin
2021-03-13 20:22   ` Konrad Dybcio
2021-04-05  5:50     ` Hector Martin
2021-04-06  7:14       ` Arnd Bergmann
2021-03-05 10:11 ` [RFT PATCH v3 00/27] Apple M1 SoC platform bring-up Hector Martin
2021-03-05 10:11   ` Hector Martin

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