From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753596AbbFKPMq (ORCPT ); Thu, 11 Jun 2015 11:12:46 -0400 Received: from casper.infradead.org ([85.118.1.10]:40865 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752421AbbFKPMo (ORCPT ); Thu, 11 Jun 2015 11:12:44 -0400 Message-ID: <1434035560.3907.74.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: zhen-hual@hp.com, iommu@lists.linux-foundation.org, bhe@redhat.com, linux-kernel@vger.kernel.org Date: Thu, 11 Jun 2015 16:12:40 +0100 In-Reply-To: <1434033896.3907.61.camel@infradead.org> 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> <20150611142554.GG16345@suse.de> <1434033896.3907.61.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-9xJk6M2pa5sKCUa71XPH" 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 --=-9xJk6M2pa5sKCUa71XPH Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2015-06-11 at 15:44 +0100, David Woodhouse wrote: > It used to look like this > ... > Now it looks like this That's not quite right; each root entry is for only *one* bus, and the correct version looks more like this... It used to look like this: Root Table Address Register | V Root Table (struct root_entry) Context Table (struct context_entry) ------------------------------ ------------------------------------ 0x00: CTX TBL for bus #0 ---------> CTX entry for 00:00.0 (bits 63-0) 0x08: unused CTX entry for 00:00.0 (bits 127-64) 0x10: CTX TBL for bus #1 ----. CTX entry for 00:00.1 (bits 63-0) ... ... | ... 0xff8:unused | CTX entry for 00:1f.7 (bits 127-64) | | | Context Table (struct context_entry) | ------------------------------------ 0x00: -----> CTX entry for 01:00.0 (bits 63-0) 0x00: CTX entry for 01:00.0 (bits 127-64) 0x08: CTX entry for 01:00.1 (bits 63-0) ... ... 0xff8: CTX entry for 01:1f.7 (bits 127-64) Now it looks like this, with each context entry taking twice the amount of space: Root Table Address Register | V Root Table (struct root_entry) Context Table (struct context_entry) ------------------------------ ------------------------------------ 0x00: CTX TBL LO for bus #0 ------> CTX entry for 00:00.0 (bits 63-0) 0x08: CTX TBL HI for bus #0 --. CTX entry for 00:00.0 (bits 127-64) 0x10: CTX TBL LO for bus #1 | CTX entry for 00:00.0 (bits 191-128) ... ... | ... 0xff8:CTX TBL HI for bus #FF | CTX entry for 00:0f.7 (bits 255-192) | | | Context Table (struct context_entry) | ------------------------------------ 0x00: ----> CTX entry for 00:10.0 (bits 63-0) 0x00: CTX entry for 00:10.0 (bits 127-64) 0x08: CTX entry for 00:10.0 (bits 191-128) ... ... 0xff8: CTX entry for 00:1f.7 (bits 63-0) --=20 dwmw2 --=-9xJk6M2pa5sKCUa71XPH Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISjjCCBicw ggUPoAMCAQICAw3vNzANBgkqhkiG9w0BAQUFADCBjDELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0 YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcx ODA2BgNVBAMTL1N0YXJ0Q29tIENsYXNzIDEgUHJpbWFyeSBJbnRlcm1lZGlhdGUgQ2xpZW50IENB 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