linux-kernel - Re: [PATCH v4 3/4] irqchip: GIC: Convert to EOImode == 1

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Message-ID: <55F2CECB.10801@citrix.com>
Date:	Fri, 11 Sep 2015 13:53:31 +0100
From:	Julien Grall <julien.grall@...rix.com>
To:	Marc Zyngier <marc.zyngier@....com>,
	Ian Campbell <ian.campbell@...rix.com>,
	Pranavkumar Sawargaonkar <pranavkumar@...aro.org>
CC:	Jason Cooper <jason@...edaemon.net>, <kvm@...r.kernel.org>,
	Eric Auger <eric.auger@...aro.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	<linux-kernel@...r.kernel.org>, <kvmarm@...ts.cs.columbia.edu>,
	<linux-arm-kernel@...ts.infradead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Christoffer Dall <christoffer.dall@...aro.org>
Subject: Re: [PATCH v4 3/4] irqchip: GIC: Convert to EOImode == 1

On 11/09/15 12:09, Marc Zyngier wrote:
> On 11/09/15 11:59, Julien Grall wrote:
>>
>>
>> On 11/09/2015 11:54, Ian Campbell wrote:
>>> On Thu, 2015-09-10 at 17:23 +0100, Julien Grall wrote:
>>>> I applied the two patches on top of linus/master and I'm able to boot
>>>> correctly on X-gene. Thank you!
>>>
>>> Perhaps we should replicate this approach in Xen and get rid of
>>>   PLATFORM_QUIRK_GIC_64K_STRIDE?
>>
>> I was thinking to do it. But, I wasn't sure if it was worth to get a 
>> such "ugly" patch compare to the quirk.
> 
> It is not a quirk. It is actually recommended in the SBSA spec. The
> patch is ugly because we can't do the right thing on the one platform
> that actually implemented ARM's own recommendation (we can't tell the
> bloody firmware to stop overriding our DT).
> 
> I would otherwise have added a "arm,use-sbsa-aliasing" property (or
> something similar) instead of trying to guess things...

I will give a look to port this patch on Xen.

Regards,

-- 
Julien Grall
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