From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: Re: [PATCH] intel-iommu: respect iommu=pt Date: Tue, 24 Nov 2015 22:29:30 +0000 Message-ID: <1448404170.44976.123.camel@infradead.org> References: <58e2344c50053de58ceed658272ecc0f349c2f2f.1448401068.git.shli@fb.com> <1448402349.44976.112.camel@intel.com> <20151124221515.GB2106568@devbig084.prn1.facebook.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============2373802932042443256==" Return-path: In-Reply-To: <20151124221515.GB2106568-tb7CFzD8y5b7E6g3fPdp/g2O0Ztt9esIQQ4Iyu8u01E@public.gmane.org> 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: Shaohua Li Cc: "iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org" , "jroedel-l3A5Bk7waGM@public.gmane.org" , "Kernel-team-b10kYP2dOMg@public.gmane.org" List-Id: iommu@lists.linux-foundation.org --===============2373802932042443256== Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-hKPr5Nwak10okZpCzjCw" --=-hKPr5Nwak10okZpCzjCw Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2015-11-24 at 14:15 -0800, Shaohua Li wrote: > > I'm reluctant to change that. If it hurts you, kick your system > > vendor until they stop doing stupid things with RMRRs. >=20 > Hmm, yes, it's a device with RMRR. Don't think we can ask vendor to > stop it though. Get a new vendor? > I'd really like an option to avoid the penality for RMRR devices.=20 RMRR devices should just die. It's insanely stupid in almost all cases. > Would a new option like 'iommu=3Dstrictpt' work? Which does what? Forces passthrough in *all* cases, even when it then has to use SWIOTLB? I would much prefer to just accept that RMRR-afflicted devices are crippled. --=20 dwmw2 --=-hKPr5Nwak10okZpCzjCw Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISjjCCBicw ggUPoAMCAQICAw3vNzANBgkqhkiG9w0BAQUFADCBjDELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0 YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcx ODA2BgNVBAMTL1N0YXJ0Q29tIENsYXNzIDEgUHJpbWFyeSBJbnRlcm1lZGlhdGUgQ2xpZW50IENB MB4XDTE1MDUwNTA5NDM0MVoXDTE2MDUwNTA5NTMzNlowQjEcMBoGA1UEAwwTZHdtdzJAaW5mcmFk ZWFkLm9yZzEiMCAGCSqGSIb3DQEJARYTZHdtdzJAaW5mcmFkZWFkLm9yZzCCASIwDQYJKoZIhvcN AQEBBQADggEPADCCAQoCggEBAMkbm9kPbx1j/X4RVyf/pPKSYwelcco69TvnQQbKM8m8xkWjXJI1 jpJ1jMaGUZGFToINMSZi7lZawUozudWbXSKy1SikENSTJHffsdRAIlsp+hR8vWvjsKUry6sEdqPG doa5RY7+N4WRusWZDYW/RRWE6i9EL9qV86CVPYqw22UBOUw4/j/HVGCV6TSB8yE5iEwhk/hUuzRr 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