linux-kernel - Re: [PATCH 1/1] iommu/amd: Use delayed mmu release notifier

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Message-ID: <20141106225150.GT10744@8bytes.org>
Date:	Thu, 6 Nov 2014 23:51:50 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Oded Gabbay <oded.gabbay@....com>
Cc:	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] iommu/amd: Use delayed mmu release notifier

On Thu, Nov 06, 2014 at 03:48:51PM +0200, Oded Gabbay wrote:
> What do you mean ? I don't see I change anything in the API. All the
> changes are internal to amd_iommu_unbind_pasid(). I don't think
> *anyone* calling to amd_iommu_unbind_pasid() will care or will
> notice the slight change in timing of releasing the pasid_state
> object (instead of immediate release, it is released after the
> iteration on the mmu_notifier list has finished)

The API change is that this patch modifies amd_iommu_unbind_pasid() so
that it could be called from an mmu_notifier_release call-back (which is
not possible right now). It does that by adding just another layer of
call-backs and complicates the code. I'd like to keep that outside of
the IOMMUv2 driver.


	Joerg

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