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Open Source and information security mailing list archives
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Date: Thu, 18 Jun 2009 11:14:51 -0700 From: "Yu, Fenghua" <fenghua.yu@...el.com> To: 'Muli Ben-Yehuda' <muli@...ibm.com> CC: 'David Woodhouse' <dwmw2@...radead.org>, 'Linus Torvalds' <torvalds@...ux-foundation.org>, 'Stephen Rothwell' <sfr@...b.auug.org.au>, 'Andrew Morton' <akpm@...ux-foundation.org>, 'Ingo Molnar' <mingo@...e.hu>, 'Christopher Wright' <chrisw@...hat.com>, "Kay, Allen M" <allen.m.kay@...el.com>, 'lkml' <linux-kernel@...r.kernel.org>, 'iommu' <iommu@...ts.linux-foundation.org> Subject: RE: [PATCH 1/2] IOMMU Identity Mapping Support: iommu_identity_mapping definition > >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. By default, identity mapping is turned off. "iommu=identity" can turn it on Thanks. -Fenghua -- 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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