From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Woodhouse, David" Subject: Re: [PATCH] intel-iommu: respect iommu=pt Date: Tue, 24 Nov 2015 21:59:09 +0000 Message-ID: <1448402349.44976.112.camel@intel.com> References: <58e2344c50053de58ceed658272ecc0f349c2f2f.1448401068.git.shli@fb.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0965296256640180886==" Return-path: In-Reply-To: <58e2344c50053de58ceed658272ecc0f349c2f2f.1448401068.git.shli-b10kYP2dOMg@public.gmane.org> Content-Language: en-US List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: "iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org" , "shli-b10kYP2dOMg@public.gmane.org" Cc: "Kernel-team-b10kYP2dOMg@public.gmane.org" , "jroedel-l3A5Bk7waGM@public.gmane.org" List-Id: iommu@lists.linux-foundation.org --===============0965296256640180886== Content-Language: en-US Content-Type: multipart/signed; micalg=sha-1; protocol="application/x-pkcs7-signature"; boundary="=-bbH3ndSbwo6mYFceRUPv" --=-bbH3ndSbwo6mYFceRUPv Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2015-11-24 at 13:53 -0800, Shaohua Li wrote: > Currently if a device has rmrr or the device is a pci device, > passthrough is disabled even with iommu=3Dpt. The worry is moving such > devices between domains don't work. But some users don't do the domain > reassignment at all, disabling passthough punish everybody. And iommu=3Dp= t > is a boot option, user knows the risk. So intead of failing the > passthough, just print a warning and continue the passthough. We tend to suggest that iommu=3Dpt gives you performance for the *decent* devices, while dubious devices still get translated. So your crappy 32- bit devices still get translated. And anything unfortunate enough to have an RMRR can *still* get translated. I'm reluctant to change that. If it hurts you, kick your system vendor until they stop doing stupid things with RMRRs. I think we also need to revisit the whole 'iommu=3Dpt' thing anyway and define the semantics we expect across archiectures =E2=80=94 given that SPA= RC and POWER are doing passthrough for 'decent' devices by *default*. So let's not tweak it right now. --=20 David Woodhouse Open Source Technology Centre David.Woodhouse-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org Intel Corporation --=-bbH3ndSbwo6mYFceRUPv Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIILITCCBOsw ggPToAMCAQICEFLpAsoR6ESdlGU4L6MaMLswDQYJKoZIhvcNAQEFBQAwbzELMAkGA1UEBhMCU0Ux FDASBgNVBAoTC0FkZFRydXN0IEFCMSYwJAYDVQQLEx1BZGRUcnVzdCBFeHRlcm5hbCBUVFAgTmV0 d29yazEiMCAGA1UEAxMZQWRkVHJ1c3QgRXh0ZXJuYWwgQ0EgUm9vdDAeFw0xMzAzMTkwMDAwMDBa Fw0yMDA1MzAxMDQ4MzhaMHkxCzAJBgNVBAYTAlVTMQswCQYDVQQIEwJDQTEUMBIGA1UEBxMLU2Fu dGEgQ2xhcmExGjAYBgNVBAoTEUludGVsIENvcnBvcmF0aW9uMSswKQYDVQQDEyJJbnRlbCBFeHRl cm5hbCBCYXNpYyBJc3N1aW5nIENBIDRBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA 4LDMgJ3YSVX6A9sE+jjH3b+F3Xa86z3LLKu/6WvjIdvUbxnoz2qnvl9UKQI3sE1zURQxrfgvtP0b 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