From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.6 required=3.0 tests=DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 02419C6778A for ; Tue, 3 Jul 2018 10:53:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8E2CC20C07 for ; Tue, 3 Jul 2018 10:53:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="savoUrIB" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8E2CC20C07 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752976AbeGCKxH (ORCPT ); Tue, 3 Jul 2018 06:53:07 -0400 Received: from twosheds.infradead.org ([90.155.92.209]:34076 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752513AbeGCKxG (ORCPT ); Tue, 3 Jul 2018 06:53:06 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=twosheds.20170209; h=Mime-Version:Date:Content-Type: References:In-Reply-To:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=XjWtgyf2TWlsQzDIQNLSLJlP8v91SAWXD/ZHw2DIC8Y=; b=savoUrIB0pYHqJwGQSdfz/Ml0 wu5SEPiwwYNlW8RPF1O+OYoi9P52LhSnBLBNNq6VCQeXTQJPXJ7oiNP9kNt2oowx3C0+QprMjVBXu 1F+qJz+esxmS43Pl9YQYkho99gLTPSYdCsJZ46PtBUkB/GZIvtBqxMYAcBvoQoMS7OES+tCSE/PGF Hmq7JuLDNu9i1RPJ265x89Ua6n5zkLYoxUTL+I+U+CJN55OpTKORDRnMVwTkDlI4giLAA3V4EyIKb UH3+3cbilELaSFiUFfKe+QP+0JnppnKEtHgUpuiycMI/xqsa4AEJpFNVEHtD1Z7SnSBzpuRFllGnT bMrRQm5GA==; Received: from [2001:8b0:10b:1::2fb] by twosheds.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1faIvI-0001sc-9X; Tue, 03 Jul 2018 10:52:40 +0000 Message-ID: <1530615159.13595.9.camel@infradead.org> Subject: Re: [RFC PATCH] iommu/vt-d: Exclude known RMRRs from reserved ranges From: David Woodhouse To: Alex Williamson , "Tian, Kevin" Cc: "iommu@lists.linux-foundation.org" , "kvm@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "shameerali.kolothum.thodi@huawei.com" In-Reply-To: <20180607090157.5458a2ae@w520.home> References: <20180605190400.22732.2998.stgit@gimli.home> <20180607090157.5458a2ae@w520.home> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-6d7y9bnk2XUc++v7n9QB" Date: Tue, 03 Jul 2018 11:52:39 +0100 Mime-Version: 1.0 X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 X-SRS-Rewrite: SMTP reverse-path rewritten from by twosheds.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-6d7y9bnk2XUc++v7n9QB Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2018-06-07 at 09:01 -0600, Alex Williamson wrote: >=20 > > intel_iommu_get_resv_regions is used not just for IOMMU API. I'm > > afraid doing so will make RMRR completely ignored, even in normal > > DMA API path... >=20 > Well, I'm a bit stuck then, we have existing IOMMU API users that > ignore these ranges and in fact conflict with these ranges blocking us > from restricting mappings within these ranges.=C2=A0 My impression is tha= t > IOMMU reserved ranges should only be ranges which have some fundamental > limitation in the IOMMU, not simply mappings for which firmware has > requested an identity mapped range.=C2=A0 The latter should simply be a > pre-allocation of the IOVA space, for the cases where we choose to > honor the RMRR.=C2=A0 Thanks, Unfortunately, Intel likes to encourage vendors to do batshit insane things in firmware, at runtime, using DMA. Perhaps the way to handle this is for the device drivers to cancel any RMRR for their devices, as they take it over. So USB and graphics drivers would clear the corresponding RMRRs as they take ownership of the device... but anything without a driver, or things like the SCSI host controllers which know that there might be some HP insanity going on in SMM in parallel with what they're doing, would not (and hence would not be assignable, etc.). --=-6d7y9bnk2XUc++v7n9QB Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEFQw ggUxMIIEGaADAgECAhBNRhEyk/HZ7naOeTHWrzuAMA0GCSqGSIb3DQEBCwUAMIGXMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRowGAYD VQQKExFDT01PRE8gQ0EgTGltaXRlZDE9MDsGA1UEAxM0Q09NT0RPIFJTQSBDbGllbnQgQXV0aGVu dGljYXRpb24gYW5kIFNlY3VyZSBFbWFpbCBDQTAeFw0xNzEyMjEwMDAwMDBaFw0xODEyMjEyMzU5 NTlaMCQxIjAgBgkqhkiG9w0BCQEWE2R3bXcyQGluZnJhZGVhZC5vcmcwggEiMA0GCSqGSIb3DQEB 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