From: Muli Ben-Yehuda <muli@il.ibm.com>
To: "Yu, Fenghua" <fenghua.yu@intel.com>
Cc: "'David Woodhouse'" <dwmw2@infradead.org>,
"'Linus Torvalds'" <torvalds@linux-foundation.org>,
"'Stephen Rothwell'" <sfr@canb.auug.org.au>,
"'Andrew Morton'" <akpm@linux-foundation.org>,
"'Ingo Molnar'" <mingo@elte.hu>,
"'Christopher Wright'" <chrisw@redhat.com>,
"Kay, Allen M" <allen.m.kay@intel.com>,
"'lkml'" <linux-kernel@vger.kernel.org>,
"'iommu'" <iommu@lists.linux-foundation.org>
Subject: Re: [PATCH 1/2] IOMMU Identity Mapping Support: iommu_identity_mapping definition
Date: Thu, 18 Jun 2009 21:25:45 +0300 [thread overview]
Message-ID: <20090618182545.GC6838@il.ibm.com> (raw)
In-Reply-To: <A6AD88C3F2289247BE726C37303E1EB8B0044EC0@orsmsx505.amr.corp.intel.com>
On Thu, Jun 18, 2009 at 11:14:51AM -0700, Yu, Fenghua wrote:
> >
> >On Thu, Jun 18, 2009 at 11:05:14AM -0700, Fenghua Yu wrote:
> >
> >> IOMMU Identity Mapping Support: iommu_identity_mapping definition
> >>
> >> Identity mapping for IOMMU defines a single domain to 1:1 map all
> >> pci devices to all usable memory.
> >
> >Why use VT-d at all in this case? Do you have a use-case in mind?
>
> Some users want to use VT-d in KVM but are concerned of DMA
> remapping performance. They can use identity mapping and still have
> KVM on VT-d. They can also use pass through patch (sent out before)
> if hardware supports pass through.
Sorry, I must be missing something. For the normal device assignment
case, we want the IOMMU page tables to have gpa->hpa mappings rather
than the 1-1 identity mapping. How do you envision the 1-1 mapping
being used in the device assignment case?
Cheers,
Muli
--
Muli Ben-Yehuda | muli@il.ibm.com | +972-4-8281080
Manager, Virtualization and Systems Architecture
Master Inventor, IBM Haifa Research Laboratory
next prev parent reply other threads:[~2009-06-18 18:28 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20090327212241.234500000@intel.com>
2009-03-28 14:24 ` [patch 0/4] Intel IOMMU Supspend/Resume Support Andrew Lutomirski
2009-03-30 23:01 ` David Woodhouse
[not found] ` <20090327212321.520992000@intel.com>
2009-04-03 12:37 ` [patch 4/4] Intel IOMMU Suspend/Resume Support - Code Clean Up David Woodhouse
[not found] ` <20090327212321.070229000@intel.com>
2009-04-16 0:19 ` [PATCH] Intel IOMMU Pass Through Support Fenghua Yu
2009-04-16 2:13 ` Han, Weidong
2009-04-19 10:05 ` David Woodhouse
2009-04-20 17:27 ` Yu, Fenghua
2009-05-13 23:13 ` [PATCH] Fix Intel IOMMU Compilation Warnings on IA64 Fenghua Yu
2009-05-14 15:17 ` David Woodhouse
2009-05-14 15:31 ` Matthew Wilcox
2009-05-14 17:59 ` Fenghua Yu
2009-06-18 18:05 ` [PATCH 1/2] IOMMU Identity Mapping Support: iommu_identity_mapping definition Fenghua Yu
2009-06-18 18:08 ` Muli Ben-Yehuda
2009-06-18 18:13 ` Chris Wright
2009-06-18 18:14 ` Yu, Fenghua
2009-06-18 18:25 ` Muli Ben-Yehuda [this message]
2009-06-18 18:31 ` Chris Wright
2009-06-18 18:41 ` Muli Ben-Yehuda
2009-06-18 18:50 ` Yu, Fenghua
2009-06-18 18:51 ` Chris Wright
2009-06-18 19:09 ` Yu, Fenghua
2009-06-25 0:38 ` [PATCH] IA64 Compilation Error Fix for Intel IOMMU Identity Mapping Support Fenghua Yu
2009-06-25 1:00 ` FUJITA Tomonori
2009-06-25 4:16 ` [PATCH v2] " Fenghua Yu
2009-06-25 4:48 ` FUJITA Tomonori
2009-06-25 7:11 ` David Woodhouse
2009-06-25 21:52 ` David Woodhouse
2009-06-25 21:56 ` Yu, Fenghua
2009-06-26 18:21 ` David Woodhouse
2009-06-25 22:00 ` Linus Torvalds
2009-06-25 22:46 ` Tony Luck
2009-06-25 23:43 ` Chris Wright
2009-06-26 1:35 ` Linus Torvalds
2009-06-26 1:52 ` Chris Wright
2009-06-26 2:00 ` Linus Torvalds
2009-06-26 2:08 ` Chris Wright
2009-06-26 11:15 ` David Woodhouse
2009-06-27 0:03 ` Chris Wright
2009-06-27 11:44 ` David Woodhouse
2009-06-18 18:13 ` [PATCH 1/2] IOMMU Identity Mapping Support: iommu_identity_mapping definition Chris Wright
2009-06-18 18:28 ` Yu, Fenghua
2009-06-18 18:34 ` Chris Wright
2009-07-04 18:40 ` David Woodhouse
2009-05-20 17:42 ` [PATCH] Time out for possible dead loops during queued invalidation wait Fenghua Yu
2009-05-27 5:51 ` Andrew Morton
2009-05-27 22:40 ` Yu, Fenghua
2009-05-27 22:48 ` Andrew Morton
2009-05-27 23:25 ` Yu, Fenghua
2009-05-27 23:51 ` Andrew Morton
2009-05-28 0:47 ` Yu, Fenghua
2009-06-18 18:05 ` [PATCH 2/2] IOMMU Identity Mapping Support: Intel IOMMU implementation Fenghua Yu
2009-06-18 19:15 ` Chris Wright
2009-06-18 19:40 ` Yu, Fenghua
2009-06-18 20:02 ` Chris Wright
2009-06-19 20:47 ` [PATCH v2] IOMMU Identity Mapping Support (drivers/pci/intel_iommu.c) Fenghua Yu
2009-04-30 23:29 ` [PATCH] Intel IOMMU Pass Through Support Andrew Morton
2009-04-30 23:37 ` Randy Dunlap
2009-05-01 0:00 ` Andrew Morton
2009-05-01 0:57 ` Fenghua Yu
2009-05-01 0:05 ` Fenghua Yu
2009-05-01 0:14 ` Andrew Morton
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