From: Marc Zyngier <marc.zyngier-5wv7dgnIgG8@public.gmane.org>
To: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>,
"linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>
Cc: Mark Rutland <Mark.Rutland-5wv7dgnIgG8@public.gmane.org>,
Eddie Huang <eddie.huang-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>,
"devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Jason Cooper <jason-NLaQJdtUoK4Be96aLqz0jA@public.gmane.org>,
Pawel Moll <Pawel.Moll-5wv7dgnIgG8@public.gmane.org>,
Ian Campbell
<ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org>,
Catalin Marinas <Catalin.Marinas-5wv7dgnIgG8@public.gmane.org>,
Olof Johansson <olof-nZhT3qVonbNeoWH0uzbU5w@public.gmane.org>,
Will Deacon <Will.Deacon-5wv7dgnIgG8@public.gmane.org>,
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<srv_heupstream-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>,
Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Sascha Hauer <kernel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>,
Kumar Gala <galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
Matthias Brugger
<matthias.bgg-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
"Joe.C" <yingjoe.chen-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>,
Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
Mark Brown <broonie-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Subject: Re: [PATCH v2 3/4] arm64: dts: Add mediatek MT8173 SoC and evaluation board dts and Makefile
Date: Mon, 22 Dec 2014 09:07:24 +0000 [thread overview]
Message-ID: <5497DF4C.4000104@arm.com> (raw)
In-Reply-To: <3669965.zfJEHTFEBI@wuerfel>
On 20/12/14 20:07, Arnd Bergmann wrote:
> On Wednesday 17 December 2014 15:01:29 Marc Zyngier wrote:
>>
>> Indeed, as described in the documentation:
>> http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0471b/CHDIFAEE.html
>>
>> Also it is worth noticing that given how GICV is placed, it will never
>> work with 64K pages and virtualization. Pretty sad.
>
> Does this mean no VGIC support on this platform so you have to emulate it
> in order to run virtual machines with 64K pages, or does it mean that
> it's impossible to use that way because you can't emulate it?
As Peter said, this is not a configuration we're willing to support:
- we don't have a API to tell userspace emulation about interrupts
generated by the generic timers
- we could move the whole GIC emulation into the kernel (at the moment,
only the distributor is there), but that would be a complete nightmare
It really looks like a case of "let's drop a bunch of 64bit cores into
an existing SoC". Shame people can't read integration guidelines...
M.
--
Jazz is not dead. It just smells funny...
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next prev parent reply other threads:[~2014-12-22 9:07 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-17 14:17 [PATCH v2 0/4] Add basic support for Mediatek MT8173 SoC Eddie Huang
2014-12-17 14:17 ` [PATCH v2 1/4] Document: DT: Add bindings for mediatek MT8173 Soc Platform Eddie Huang
2014-12-17 14:17 ` [PATCH v2 2/4] irqchip: mtk-sysirq: Get irq number from register resource size Eddie Huang
2014-12-17 14:17 ` [PATCH v2 3/4] arm64: dts: Add mediatek MT8173 SoC and evaluation board dts and Makefile Eddie Huang
[not found] ` <1418825853-10934-4-git-send-email-eddie.huang-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
2014-12-17 14:33 ` Mark Rutland
2014-12-17 15:01 ` Marc Zyngier
[not found] ` <54919AC9.2090306-5wv7dgnIgG8@public.gmane.org>
2014-12-20 20:07 ` Arnd Bergmann
2014-12-20 22:54 ` Peter Maydell
2014-12-22 9:07 ` Marc Zyngier [this message]
2014-12-23 8:02 ` Eddie Huang
2014-12-23 8:43 ` Marc Zyngier
[not found] ` <72aa7f4069a000c6e39c53e328015aa3-PqNocJHN/zZWj0EZb7rXcA@public.gmane.org>
2014-12-23 21:07 ` Arnd Bergmann
2014-12-24 8:47 ` Marc Zyngier
2014-12-23 7:30 ` Eddie Huang
2014-12-17 14:17 ` [PATCH v2 4/4] arm64: mediatek: Add MT8173 SoC Kconfig and defconfig Eddie Huang
[not found] ` <1418825853-10934-1-git-send-email-eddie.huang-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
2014-12-17 14:35 ` [PATCH v2 0/4] Add basic support for Mediatek MT8173 SoC Arnd Bergmann
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