linux-kernel - Re: [v3 06/26] iommu, x86: No need to migrating irq for VT-d Posted-Interrupts

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Message-ID: <1422458946.5293.58.camel@infradead.org>
Date:	Wed, 28 Jan 2015 15:29:06 +0000
From:	David Woodhouse <dwmw2@...radead.org>
To:	Feng Wu <feng.wu@...el.com>
Cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, gleb@...nel.org, pbonzini@...hat.com,
	joro@...tes.org, alex.williamson@...hat.com,
	jiang.liu@...ux.intel.com, eric.auger@...aro.org,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	kvm@...r.kernel.org
Subject: Re: [v3 06/26] iommu, x86: No need to migrating irq for VT-d
 Posted-Interrupts

On Fri, 2014-12-12 at 23:14 +0800, Feng Wu wrote:
> We don't need to migrate the irqs for VT-d Posted-Interrupts here.
> When 'pst' is set in IRTE, the associated irq will be posted to
> guests instead of interrupt remapping. The destination of the
> interrupt is set in Posted-Interrupts Descriptor, and the migration
> happens during vCPU scheduling.
> 
> However, we still update the cached irte here, which can be used
> when changing back to remapping mode.
> 
> Signed-off-by: Feng Wu <feng.wu@...el.com>
> Reviewed-by: Jiang Liu <jiang.liu@...ux.intel.com>

Acked-by: David Woodhouse <David.Woodhouse@...el.com>

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

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