linux-kernel - Re: [v4 0/8] Add VT-d Posted-Interrupts support

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Message-ID: <20150402112833.GN4441@8bytes.org>
Date:	Thu, 2 Apr 2015 13:28:33 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Feng Wu <feng.wu@...el.com>
Cc:	dwmw2@...radead.org, jiang.liu@...ux.intel.com,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	"Li, Zhen-Hua" <zhen-hual@...com>
Subject: Re: [v4 0/8] Add VT-d Posted-Interrupts support - IOMMU part

On Mon, Feb 02, 2015 at 04:06:56PM +0800, Feng Wu wrote:
> VT-d Posted-Interrupts is an enhancement to CPU side Posted-Interrupt.
> With VT-d Posted-Interrupts enabled, external interrupts from
> direct-assigned devices can be delivered to guests without VMM
> intervention when guest is running in non-root mode.
> 
> You can find the VT-d Posted-Interrtups Spec. in the following URL:
> http://www.intel.com/content/www/us/en/intelligent-systems/intel-technology/vt-directed-io-spec.html
> 
> This series was part of http://thread.gmane.org/gmane.linux.kernel.iommu/7708. To make things clear, send out IOMMU part here.

Besides the modify_irte() changes I asked for the patch-set looks good.
I just have some concerns what these changes mean for the VT-d kdump
improvements Zhen-Hua Li is working on. Can you please discuss the
implications of having both patch-sets applied with him and make sure
they work together? I think in its current form your patch-set breaks
the kdump support patches. I added Zhen-Hua to Cc.

Thanks,

	Joerg

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