From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:38832) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Rcm8i-0001Fr-Eq for qemu-devel@nongnu.org; Mon, 19 Dec 2011 17:57:01 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Rcm8g-0003Ze-V4 for qemu-devel@nongnu.org; Mon, 19 Dec 2011 17:57:00 -0500 Received: from casper.infradead.org ([85.118.1.10]:51349) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Rcm8g-0003ZZ-MR for qemu-devel@nongnu.org; Mon, 19 Dec 2011 17:56:58 -0500 Message-ID: <1324335400.2132.47.camel@shinybook.infradead.org> From: David Woodhouse Date: Mon, 19 Dec 2011 22:56:40 +0000 In-Reply-To: <20111219223120.GB5207@truffala.fritz.box> References: <1323930340-24055-1-git-send-email-david@gibson.dropbear.id.au> <1323972307.2437.19.camel@x201.home> <20111216145353.GA29877@amd.com> <20111219001125.GA30390@truffala.fritz.box> <1324309598.2132.12.camel@shinybook.infradead.org> <20111219223120.GB5207@truffala.fritz.box> Content-Type: multipart/signed; micalg="sha1"; protocol="application/x-pkcs7-signature"; boundary="=-djBytA3bGYlK8uBIEKWv" Mime-Version: 1.0 Subject: Re: [Qemu-devel] [RFC] Device isolation infrastructure v2 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: David Gibson Cc: chrisw@redhat.com, aik@ozlabs.ru, Joerg Roedel , joro@8bytes.org, rusty@rustcorp.com.au, agraf@suse.de, iommu@lists.linux-foundation.org, qemu-devel@nongnu.org, B08248@freescale.com, Alex Williamson , scottwood@freescale.com, linux-kernel@vger.kernel.org --=-djBytA3bGYlK8uBIEKWv Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2011-12-20 at 09:31 +1100, David Gibson wrote: > When we're running paravirtualized under pHyp, it's impossible to > merge multiple PEs into one domain per se. We could fake it rather > nastily by replicating all map/unmaps across mutiple PEs. When > running bare metal, we could do so a bit more nicely by assigning > multiple PEs the same TCE pointer, but we have no mechanism to do so > at present.=20 VT-d does share the page tables, as you could on bare metal. But it's an implementation detail =E2=80=94 there's nothing *fundamentally* wrong with having to do the map/unmap for each PE, is there? It's only at VM setup time, so it doesn't really matter if it's slow. Surely that's the only way you're going to present the guest with the illusion of having no IOMMU; so that DMA to any given guest physical address "just works". On the other hand, perhaps you don't want to do that at all. Perhaps you're better off presenting a virtualised IOMMU to the guest and *insisting* that it fully uses it in order to do any DMA at all? --=20 dwmw2 --=-djBytA3bGYlK8uBIEKWv Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIITvzCCBi0w ggQVoAMCAQICAwCtOTANBgkqhkiG9w0BAQUFADBUMRQwEgYDVQQKEwtDQWNlcnQgSW5jLjEeMBwG A1UECxMVaHR0cDovL3d3dy5DQWNlcnQub3JnMRwwGgYDVQQDExNDQWNlcnQgQ2xhc3MgMyBSb290 MB4XDTEwMDYxMjEwMDMwMFoXDTEyMDYxMTEwMDMwMFowgegxGDAWBgNVBAMTD0RhdmlkIFdvb2Ro b3VzZTEiMCAGCSqGSIb3DQEJARYTZHdtdzJAaW5mcmFkZWFkLm9yZzEfMB0GCSqGSIb3DQEJARYQ ZGF2aWRAd29vZGhvdS5zZTEoMCYGCSqGSIb3DQEJARYZZGF2aWQud29vZGhvdXNlQGludGVsLmNv bTEkMCIGCSqGSIb3DQEJARYVZHdtdzJAbGludXguaW50ZWwuY29tMTcwNQYJKoZIhvcNAQkBFigx MDg3MmEwN2Y2ZDdlMWUwN2Y1NWZmMTcyYTAzYjMwMGVlYWFkMjAzMIIBIjANBgkqhkiG9w0BAQEF 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