Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753101AbbFKOTl (ORCPT ); Thu, 11 Jun 2015 10:19:41 -0400 Received: from casper.infradead.org ([85.118.1.10]:40412 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752324AbbFKOTf (ORCPT ); Thu, 11 Jun 2015 10:19:35 -0400 Message-ID: <1434032371.3907.45.camel@infradead.org> Subject: Re: [PATCH 2/4] iommu/vt-d: Don't consider copied context entries as present From: David Woodhouse To: Joerg Roedel Cc: Joerg Roedel , iommu@lists.linux-foundation.org, zhen-hual@hp.com, bhe@redhat.com, linux-kernel@vger.kernel.org Date: Thu, 11 Jun 2015 15:19:31 +0100 In-Reply-To: <20150611141256.GF16345@suse.de> References: <1434030463-942-1-git-send-email-joro@8bytes.org> <1434030463-942-3-git-send-email-joro@8bytes.org> <1434031622.3907.40.camel@infradead.org> <20150611141256.GF16345@suse.de> Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-0GDxed0xlCFn24EeXqlz" X-Mailer: Evolution 3.16.2.1 (3.16.2.1-2.fc22) Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9891 Lines: 160 --=-0GDxed0xlCFn24EeXqlz Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2015-06-11 at 16:12 +0200, Joerg Roedel wrote: > On Thu, Jun 11, 2015 at 03:07:02PM +0100, David Woodhouse wrote: > > On Thu, 2015-06-11 at 15:47 +0200, Joerg Roedel wrote: > > > From: Joerg Roedel > > >=20 > > > Hide the copied context entries from the IOMMU driver by > > > considering them as non-present. This is implemented by > > > setting the first AVL bit (bit 67) in the context entry to > > > one. If this bit is set, the context_present() function > > > returns false. > > >=20 > > > Signed-off-by: Joerg Roedel > >=20 > > In the extended context entry, bit 67 is the PGE bit. There are no=20 > > bits > > which are available to software, to my knowledge. >=20 > Ah you are right, I was looking at the context-entry format without > PASID. Then I have to solve this differently. Thanks for pointing=20 > that out While looking for spare bits, I was pondering the FPD (fault processing disable) bit. Which we're likely to want to set when we are seeing fault storms from misbehaving devices, although that hasn't been implemented yet. That code path is going to want to keep some per-device state over and above what's in the context entry (and it's going to tie in with generic PCI/device error handling too). In the short term, perhaps it's not unreasonable to set the FPD bit on 'inherited' domains? That might be what you wanted anyway? Later on, we'll want to be able to turn that on and off at runtime and it won't purely serve as a marker for 'inherited' domains. But as I said, at that point we'll *need* external state anyway. So I think that's OK, perhaps? --=20 dwmw2 --=-0GDxed0xlCFn24EeXqlz 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 FZm1MJMR7mCS7BCR8Lr5jFY61lWpBiXNXIxLZCvDc26KR5L5tYX43iUVO3fzES1GRVoYnxxk2tmz fcsZG5vK+Trc9L8OZJfkYrEHH3+Iw41MQ0w/djVtYr1+HYldx0QmYXAtnhIj+UMCAwEAAaOCAtkw ggLVMAkGA1UdEwQCMAAwCwYDVR0PBAQDAgSwMB0GA1UdJQQWMBQGCCsGAQUFBwMCBggrBgEFBQcD BDAdBgNVHQ4EFgQUszC96C3w5/2+d+atSr0IpT26YI4wHwYDVR0jBBgwFoAUU3Ltkpzg2ssBXHx+ ljVO8tS4UYIwHgYDVR0RBBcwFYETZHdtdzJAaW5mcmFkZWFkLm9yZzCCAUwGA1UdIASCAUMwggE/ MIIBOwYLKwYBBAGBtTcBAgMwggEqMC4GCCsGAQUFBwIBFiJodHRwOi8vd3d3LnN0YXJ0c3NsLmNv bS9wb2xpY3kucGRmMIH3BggrBgEFBQcCAjCB6jAnFiBTdGFydENvbSBDZXJ0aWZpY2F0aW9uIEF1 dGhvcml0eTADAgEBGoG+VGhpcyBjZXJ0aWZpY2F0ZSB3YXMgaXNzdWVkIGFjY29yZGluZyB0byB0 aGUgQ2xhc3MgMSBWYWxpZGF0aW9uIHJlcXVpcmVtZW50cyBvZiB0aGUgU3RhcnRDb20gQ0EgcG9s aWN5LCByZWxpYW5jZSBvbmx5IGZvciB0aGUgaW50ZW5kZWQgcHVycG9zZSBpbiBjb21wbGlhbmNl IG9mIHRoZSByZWx5aW5nIHBhcnR5IG9ibGlnYXRpb25zLjA2BgNVHR8ELzAtMCugKaAnhiVodHRw Oi8vY3JsLnN0YXJ0c3NsLmNvbS9jcnR1MS1jcmwuY3JsMIGOBggrBgEFBQcBAQSBgTB/MDkGCCsG AQUFBzABhi1odHRwOi8vb2NzcC5zdGFydHNzbC5jb20vc3ViL2NsYXNzMS9jbGllbnQvY2EwQgYI KwYBBQUHMAKGNmh0dHA6Ly9haWEuc3RhcnRzc2wuY29tL2NlcnRzL3N1Yi5jbGFzczEuY2xpZW50 LmNhLmNydDAjBgNVHRIEHDAahhhodHRwOi8vd3d3LnN0YXJ0c3NsLmNvbS8wDQYJKoZIhvcNAQEF BQADggEBAHMQmxHHodpS85X8HRyxhvfkys7r+taCNOaNU9cxQu/cZ/6k5nS2qGNMzZ6jb7ueY/V7 7p+4DW/9ZWODDTf4Fz00mh5SSVc20Bz7t+hhxwHd62PZgENh5i76Qq2tw48U8AsYo5damHby1epf neZafLpUkLLO7AGBJIiRVTevdvyXQ0qnixOmKMWyvrhSNGuVIKVdeqLP+102Dwf+dpFyw+j1hz28 jEEKpHa+NR1b2kXuSPi/rMGhexwlJOh4tK8KQ6Ryr0rIN//NSbOgbyYZrzc/ZUWX9V5OA84ChFb2 vkFl0OcYrttp/rhDBLITwffPxSZeoBh9H7zYzkbCXKL3BUIwggYnMIIFD6ADAgECAgMN7zcwDQYJ KoZIhvcNAQEFBQAwgYwxCzAJBgNVBAYTAklMMRYwFAYDVQQKEw1TdGFydENvbSBMdGQuMSswKQYD VQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0aWZpY2F0ZSBTaWduaW5nMTgwNgYDVQQDEy9TdGFydENv bSBDbGFzcyAxIFByaW1hcnkgSW50ZXJtZWRpYXRlIENsaWVudCBDQTAeFw0xNTA1MDUwOTQzNDFa Fw0xNjA1MDUwOTUzMzZaMEIxHDAaBgNVBAMME2R3bXcyQGluZnJhZGVhZC5vcmcxIjAgBgkqhkiG 9w0BCQEWE2R3bXcyQGluZnJhZGVhZC5vcmcwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIB AQDJG5vZD28dY/1+EVcn/6TykmMHpXHKOvU750EGyjPJvMZFo1ySNY6SdYzGhlGRhU6CDTEmYu5W WsFKM7nVm10istUopBDUkyR337HUQCJbKfoUfL1r47ClK8urBHajxnaGuUWO/jeFkbrFmQ2Fv0UV hOovRC/alfOglT2KsNtlATlMOP4/x1Rglek0gfMhOYhMIZP4VLs0axWZtTCTEe5gkuwQkfC6+YxW OtZVqQYlzVyMS2Qrw3NuikeS+bWF+N4lFTt38xEtRkVaGJ8cZNrZs33LGRubyvk63PS/DmSX5GKx Bx9/iMONTENMP3Y1bWK9fh2JXcdEJmFwLZ4SI/lDAgMBAAGjggLZMIIC1TAJBgNVHRMEAjAAMAsG A1UdDwQEAwIEsDAdBgNVHSUEFjAUBggrBgEFBQcDAgYIKwYBBQUHAwQwHQYDVR0OBBYEFLMwvegt 8Of9vnfmrUq9CKU9umCOMB8GA1UdIwQYMBaAFFNy7ZKc4NrLAVx8fpY1TvLUuFGCMB4GA1UdEQQX MBWBE2R3bXcyQGluZnJhZGVhZC5vcmcwggFMBgNVHSAEggFDMIIBPzCCATsGCysGAQQBgbU3AQID MIIBKjAuBggrBgEFBQcCARYiaHR0cDovL3d3dy5zdGFydHNzbC5jb20vcG9saWN5LnBkZjCB9wYI KwYBBQUHAgIwgeowJxYgU3RhcnRDb20gQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkwAwIBARqBvlRo aXMgY2VydGlmaWNhdGUgd2FzIGlzc3VlZCBhY2NvcmRpbmcgdG8gdGhlIENsYXNzIDEgVmFsaWRh dGlvbiByZXF1aXJlbWVudHMgb2YgdGhlIFN0YXJ0Q29tIENBIHBvbGljeSwgcmVsaWFuY2Ugb25s eSBmb3IgdGhlIGludGVuZGVkIHB1cnBvc2UgaW4gY29tcGxpYW5jZSBvZiB0aGUgcmVseWluZyBw YXJ0eSBvYmxpZ2F0aW9ucy4wNgYDVR0fBC8wLTAroCmgJ4YlaHR0cDovL2NybC5zdGFydHNzbC5j b20vY3J0dTEtY3JsLmNybDCBjgYIKwYBBQUHAQEEgYEwfzA5BggrBgEFBQcwAYYtaHR0cDovL29j c3Auc3RhcnRzc2wuY29tL3N1Yi9jbGFzczEvY2xpZW50L2NhMEIGCCsGAQUFBzAChjZodHRwOi8v YWlhLnN0YXJ0c3NsLmNvbS9jZXJ0cy9zdWIuY2xhc3MxLmNsaWVudC5jYS5jcnQwIwYDVR0SBBww GoYYaHR0cDovL3d3dy5zdGFydHNzbC5jb20vMA0GCSqGSIb3DQEBBQUAA4IBAQBzEJsRx6HaUvOV /B0csYb35MrO6/rWgjTmjVPXMULv3Gf+pOZ0tqhjTM2eo2+7nmP1e+6fuA1v/WVjgw03+Bc9NJoe UklXNtAc+7foYccB3etj2YBDYeYu+kKtrcOPFPALGKOXWph28tXqX53mWny6VJCyzuwBgSSIkVU3 r3b8l0NKp4sTpijFsr64UjRrlSClXXqiz/tdNg8H/naRcsPo9Yc9vIxBCqR2vjUdW9pF7kj4v6zB oXscJSToeLSvCkOkcq9KyDf/zUmzoG8mGa83P2VFl/VeTgPOAoRW9r5BZdDnGK7baf64QwSyE8H3 z8UmXqAYfR+82M5Gwlyi9wVCMIIGNDCCBBygAwIBAgIBHjANBgkqhkiG9w0BAQUFADB9MQswCQYD VQQGEwJJTDEWMBQGA1UEChMNU3RhcnRDb20gTHRkLjErMCkGA1UECxMiU2VjdXJlIERpZ2l0YWwg Q2VydGlmaWNhdGUgU2lnbmluZzEpMCcGA1UEAxMgU3RhcnRDb20gQ2VydGlmaWNhdGlvbiBBdXRo b3JpdHkwHhcNMDcxMDI0MjEwMTU1WhcNMTcxMDI0MjEwMTU1WjCBjDELMAkGA1UEBhMCSUwxFjAU BgNVBAoTDVN0YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRl IFNpZ25pbmcxODA2BgNVBAMTL1N0YXJ0Q29tIENsYXNzIDEgUHJpbWFyeSBJbnRlcm1lZGlhdGUg Q2xpZW50IENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAxwmDzM4t2BqxKaQuE6uW vooyg4ymiEGWVUet1G8SD+rqvyNH4QrvnEIaFHxOhESip7vMz39ScLpNLbL1QpOlPW/tFIzNHS3q d2XRNYG5Sv9RcGE+T4qbLtsjjJbi6sL7Ls/f/X9ftTyhxvxWkf8KW37iKrueKsxw2HqolH7GM6FX 5UfNAwAu4ZifkpmZzU1slBhyWwaQPEPPZRsWoTb7q8hmgv6Nv3Hg9rmA1/VPBIOQ6SKRkHXG0Hhm q1dOFoAFI411+a/9nWm5rcVjGcIWZ2v/43Yksq60jExipA4l5uv9/+Hm33mbgmCszdj/Dthf13tg Av2O83hLJ0exTqfrlwIDAQABo4IBrTCCAakwDwYDVR0TAQH/BAUwAwEB/zAOBgNVHQ8BAf8EBAMC AQYwHQYDVR0OBBYEFFNy7ZKc4NrLAVx8fpY1TvLUuFGCMB8GA1UdIwQYMBaAFE4L7xqkQFulF2mH MMo0aEPQQa7yMGYGCCsGAQUFBwEBBFowWDAnBggrBgEFBQcwAYYbaHR0cDovL29jc3Auc3RhcnRz c2wuY29tL2NhMC0GCCsGAQUFBzAChiFodHRwOi8vd3d3LnN0YXJ0c3NsLmNvbS9zZnNjYS5jcnQw WwYDVR0fBFQwUjAnoCWgI4YhaHR0cDovL3d3dy5zdGFydHNzbC5jb20vc2ZzY2EuY3JsMCegJaAj hiFodHRwOi8vY3JsLnN0YXJ0c3NsLmNvbS9zZnNjYS5jcmwwgYAGA1UdIAR5MHcwdQYLKwYBBAGB tTcBAgEwZjAuBggrBgEFBQcCARYiaHR0cDovL3d3dy5zdGFydHNzbC5jb20vcG9saWN5LnBkZjA0 BggrBgEFBQcCARYoaHR0cDovL3d3dy5zdGFydHNzbC5jb20vaW50ZXJtZWRpYXRlLnBkZjANBgkq hkiG9w0BAQUFAAOCAgEACoMIfXirLAZcuGOMXq4cuSN3TaFx2H2GvD5VSy/6rV55BYHbWNaPeQn3 oBSU8KgQZn/Kck1JxbLpAxVCNtsxeW1R87ifhsYZ0qjdrA9anrW2MAWCtosmAOT4OxK9QPoSjCMx M3HbkZCDJgnlE8jMopH21BbyAYr7b5EfGRQJNtgWcvqSXwKHnTutR08+Kkn0KAkXCzeQNLeA5LlY UzFyM7kPAp8pIRMQ+seHunmyG642S2+y/qHEdMuGIwpfz3eDF1PdctL04qYK/zu+Qg1Bw0RwgigV Zs/0c5HP2/e9DBHh7eSwtzYlk4AUr6yxLlcwSjOfOmKEQ/Q8tzh0IFiNu9IPuTGAPBn4CPxD0+Ru 8T2wg8/s43R/PT3kd1OEqOJUl7q+h+r6fpvU0Fzxd2tC8Ga6fDEPme+1Nbi+03pVjuZQKbGwKJ66 gEn06WqaxVZC+J8hh/jR0k9mST1iAZPNYulcNJ8tKmVtjYsv0L1TSm2+NwON58tO+pIVzu3DWwSE XSf+qkDavQam+QtEOZxLBXI++aMUEapSn+k3Lxm48ZCYfAWLb/Xj7F5JQMbZvCexglAbYR0kIHqW 5DnsYSdMD/IplJMojx0NBrxJ3fN9dvX2Y6BIXRsF1du4qESm4/3CKuyUV7p9DW3mPlHTGLvYxnyK Qy7VFBkoLINszBrOUeIxggNvMIIDawIBATCBlDCBjDELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0 YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcx ODA2BgNVBAMTL1N0YXJ0Q29tIENsYXNzIDEgUHJpbWFyeSBJbnRlcm1lZGlhdGUgQ2xpZW50IENB AgMN7zcwCQYFKw4DAhoFAKCCAa8wGAYJKoZIhvcNAQkDMQsGCSqGSIb3DQEHATAcBgkqhkiG9w0B CQUxDxcNMTUwNjExMTQxOTMxWjAjBgkqhkiG9w0BCQQxFgQUgqgEacJigbxB/duFNqLCqFu9uqkw gaUGCSsGAQQBgjcQBDGBlzCBlDCBjDELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0YXJ0Q29tIEx0 ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcxODA2BgNVBAMT L1N0YXJ0Q29tIENsYXNzIDEgUHJpbWFyeSBJbnRlcm1lZGlhdGUgQ2xpZW50IENBAgMN7zcwgacG CyqGSIb3DQEJEAILMYGXoIGUMIGMMQswCQYDVQQGEwJJTDEWMBQGA1UEChMNU3RhcnRDb20gTHRk LjErMCkGA1UECxMiU2VjdXJlIERpZ2l0YWwgQ2VydGlmaWNhdGUgU2lnbmluZzE4MDYGA1UEAxMv U3RhcnRDb20gQ2xhc3MgMSBQcmltYXJ5IEludGVybWVkaWF0ZSBDbGllbnQgQ0ECAw3vNzANBgkq hkiG9w0BAQEFAASCAQAIbtyV018HULapPevLatXcKeIovbCkW7CniEQcV5bP00axWEeZ1exxRraG NHaMigw4p/Heb+Vd0RDu/Owz6MZfJDmkj45LlDn12PqXgn/A5KUPoNj+39vPhtkIyCh8ZJ9rxW9u JE0OHzn2fOkzo+a/t5gBKka2CxPC5U/30dV+JvzWMmcy8MX41f1J8nLOFBeMRlw7zfQ2DvJHm+3Z MaTLcAaoTE4vtJ4kSegnEaV3hukil1JhW2J+lud55mZ5Fc4LyP3oYFOBQ1izp0Q46sDrFDmN2A3H A9dhMNADrQ/0IohL4tWh3Uf+TAdNiPvonlHyHAC16fIXwolVQ+kkvrVmAAAAAAAA --=-0GDxed0xlCFn24EeXqlz-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/