linux-kernel - Re: [PATCH 0/2] Introduce iommu

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Message-ID: <20110629055102.GG29299@8bytes.org>
Date:	Wed, 29 Jun 2011 07:51:02 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	KyongHo Cho <pullip.cho@...sung.com>
Cc:	Joerg Roedel <joerg.roedel@....com>,
	Ohad Ben-Cohen <ohad@...ery.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	Avi Kivity <avi@...hat.com>,
	David Brown <davidb@...eaurora.org>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH 0/2] Introduce iommu_commit() function

On Wed, Jun 29, 2011 at 02:02:02PM +0900, KyongHo Cho wrote:
> Hi.
> 
> On Fri, Jun 24, 2011 at 12:31 AM, Joerg Roedel <joerg.roedel@....com> wrote:
> > It needs to be called whenever a some code changed a domain (either by
> > attaching/detaching devices or by mapping/unmapping pages in
> > the domain).
> 
> Do you mean we can invalidate IOTLB with this iommu_commit()?
> We need to invalidate IOTLB without updating page table for some
> optimized solutions.
> 
> If a device in one domain is moved to other domain, IOTLB of the
> device must be invalidated
> because it contains translation information of the previous domain.

The classic use-case is to do a single iommu-tlb flush after a set of
page-table updates, but flushing iotlbs after moving devices is a
potential use-case too, so the answer is yes.

Regards,

	Joerg

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