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

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Message-ID: <BANLkTi=mfMfVVOmoZd49fqFnY_kq0hxzDw@mail.gmail.com>
Date:	Wed, 29 Jun 2011 14:02:02 +0900
From:	KyongHo Cho <pullip.cho@...sung.com>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	David Woodhouse <dwmw2@...radead.org>,
	Ohad Ben-Cohen <ohad@...ery.com>,
	David Brown <davidb@...eaurora.org>, kvm@...r.kernel.org,
	Avi Kivity <avi@...hat.com>,
	Alex Williamson <alex.williamson@...hat.com>
Subject: Re: [PATCH 0/2] Introduce iommu_commit() function

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.

Regards,
KyongHo Cho.
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