From: marc.zyngier@arm.com (Marc Zyngier)
To: linux-arm-kernel@lists.infradead.org
Subject: [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...
WARNING: multiple messages have this Message-ID (diff)
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>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Robert Richter <rrichter-YGCgFSpz5w/QT0dZR+AlfA@public.gmane.org>,
"srv_heupstream-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org"
<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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WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <marc.zyngier@arm.com>
To: Arnd Bergmann <arnd@arndb.de>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Cc: Mark Rutland <Mark.Rutland@arm.com>,
Eddie Huang <eddie.huang@mediatek.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
Jason Cooper <jason@lakedaemon.net>,
Pawel Moll <Pawel.Moll@arm.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Catalin Marinas <Catalin.Marinas@arm.com>,
Olof Johansson <olof@lixom.net>,
Will Deacon <Will.Deacon@arm.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Robert Richter <rrichter@cavium.com>,
"srv_heupstream@mediatek.com" <srv_heupstream@mediatek.com>,
Rob Herring <robh+dt@kernel.org>,
Sascha Hauer <kernel@pengutronix.de>,
Kumar Gala <galak@codeaurora.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
"Joe.C" <yingjoe.chen@mediatek.com>,
Thomas Gleixner <tglx@linutronix.de>,
Mark Brown <broonie@linaro.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...
next prev parent reply other threads:[~2014-12-22 9:07 UTC|newest]
Thread overview: 40+ 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 ` 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 ` 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 ` 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
2014-12-17 14:17 ` Eddie Huang
2014-12-17 14:33 ` Mark Rutland
2014-12-17 14:33 ` Mark Rutland
2014-12-17 14:33 ` Mark Rutland
2014-12-17 15:01 ` Marc Zyngier
2014-12-17 15:01 ` Marc Zyngier
2014-12-17 15:01 ` Marc Zyngier
2014-12-20 20:07 ` Arnd Bergmann
2014-12-20 20:07 ` Arnd Bergmann
2014-12-20 20:07 ` Arnd Bergmann
2014-12-20 22:54 ` Peter Maydell
2014-12-20 22:54 ` Peter Maydell
2014-12-22 9:07 ` Marc Zyngier [this message]
2014-12-22 9:07 ` Marc Zyngier
2014-12-22 9:07 ` Marc Zyngier
2014-12-23 8:02 ` Eddie Huang
2014-12-23 8:02 ` Eddie Huang
2014-12-23 8:43 ` Marc Zyngier
2014-12-23 8:43 ` Marc Zyngier
2014-12-23 8:43 ` Marc Zyngier
2014-12-23 21:07 ` Arnd Bergmann
2014-12-23 21:07 ` Arnd Bergmann
2014-12-23 21:07 ` Arnd Bergmann
2014-12-24 8:47 ` Marc Zyngier
2014-12-24 8:47 ` Marc Zyngier
2014-12-24 8:47 ` Marc Zyngier
2014-12-23 7:30 ` Eddie Huang
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
2014-12-17 14:17 ` Eddie Huang
2014-12-17 14:35 ` [PATCH v2 0/4] Add basic support for Mediatek MT8173 SoC Arnd Bergmann
2014-12-17 14:35 ` Arnd Bergmann
2014-12-17 14:35 ` Arnd Bergmann
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