linux-kernel - Re: [Linaro-acpi] [PATCH v3 13/17] ARM64 / ACPI: Add GICv2 specific ACPI boot support

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Message-ID: <CAJRNFKKziDydj_HFPam6e+FSZr6D3XPUQ+-iuH0a1Bbh3+Kz3A@mail.gmail.com>
Date:	Tue, 2 Sep 2014 10:28:00 +0200
From:	Alexander Spyridakis <a.spyridakis@...tualopensystems.com>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	Hanjun Guo <hanjun.guo@...aro.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Lv Zheng <lv.zheng@...el.com>, Rob Herring <robh@...nel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Robert Moore <robert.moore@...el.com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	Robert Richter <rric@...nel.org>,
	Jason Cooper <jason@...edaemon.net>,
	Arnd Bergmann <arnd@...db.de>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Mark Brown <broonie@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Olof Johansson <olof@...om.net>
Subject: Re: [Linaro-acpi] [PATCH v3 13/17] ARM64 / ACPI: Add GICv2 specific
 ACPI boot support

On 1 September 2014 19:35, Marc Zyngier <marc.zyngier@....com> wrote:
>
> On 01/09/14 15:57, Hanjun Guo wrote:
> > From: Tomasz Nowicki <tomasz.nowicki@...aro.org>
> >
> > ACPI kernel uses MADT table for proper GIC initialization. It needs to
> > parse GIC related subtables, collect CPU interface and distributor
> > addresses and call driver initialization function (which is hardware
> > abstraction agnostic). In a similar way, FDT initialize GICv1/2.
> >
> > NOTE: This commit allow to initialize GICv1/2 only.
>
> I cannot help but notice that there is no support for KVM here. It'd be
> good to add a note to that effect, so that people do not expect
> virtualization support to be working when booting with ACPI.

Just a heads up for this, I run up to this problem too while testing
and by forcing some values for vgic and arch_timers I could boot a
QEMU guest without problems.

I'll try and see if it will be easy to handle this more properly
instead of hardcoded values.

Regards.
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