linux-kernel - Re: [Patch V1 0/6] Refine generic/PCI MSI irqodmian interfaces

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Message-ID: <alpine.DEB.2.11.1411132207470.3935@nanos>
Date:	Thu, 13 Nov 2014 22:11:26 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Marc Zyngier <marc.zyngier@....com>
cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Ingo Molnar <mingo@...hat.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Yijing Wang <wangyijing@...wei.com>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Tony Luck <tony.luck@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Patch V1 0/6] Refine generic/PCI MSI irqodmian interfaces

On Thu, 13 Nov 2014, Marc Zyngier wrote:
> With the new stacked irq domains, it becomes pretty tempting
> to allocate an MSI domain per PCI bus, which would remove
> the requirement of either relying on arch-specific code, or
> a default PCI MSI domain.

Right. That's what I roughly had in mind. And that would solve the
multi-iommu issue on x86 nicely as well. We establish the association
at the time where the bus gets populated. So the whole lookup magic
simply goes away.

Thanks,

	tglx

 
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