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Re: [Qemu-devel] [PATCH v2] intel_iommu: check misordered init when real

From: Peter Xu
Subject: Re: [Qemu-devel] [PATCH v2] intel_iommu: check misordered init when realize
Date: Wed, 1 Mar 2017 17:18:31 +0800
User-agent: Mutt/1.5.24 (2015-08-30)

On Wed, Mar 01, 2017 at 09:03:47AM +0200, Marcel Apfelbaum wrote:
> On 03/01/2017 06:14 AM, Jason Wang wrote:


> Hi Jason,
> I am not saying we don't need to create the IOMMU before some other device,
> I just don't think that the command line order should matter to user.
> BTW, are you working on a way to limit the IOMMU scope to a specific set of 
> devices?
> If yes, this approach will also help you work.


Do you have any plan after 2.9 to re-arrange the init order thing a
bit? In general, maybe we need an ordering support for devices.
Besides that, I am thinking whether it would be wise that we just init
the IOMMUs during machine init just like before, but keep the
"-device" interface? After all, at least the root IOMMU device should
be with root complex, and it feels a little strange we just split the
init process apart (we delay the IOMMU init into device

Not sure whether above makes sense though. Thanks,

-- peterx

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