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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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