Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753400AbaFQHFA (ORCPT ); Tue, 17 Jun 2014 03:05:00 -0400 Received: from casper.infradead.org ([85.118.1.10]:48253 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751690AbaFQHE5 (ORCPT ); Tue, 17 Jun 2014 03:04:57 -0400 Message-ID: <1402988692.7595.106.camel@i7.infradead.org> Subject: Re: [PATCH v2] iommu/intel: Exclude devices using RMRRs from IOMMU API domains From: David Woodhouse To: Alex Williamson Cc: iommu@lists.linux-foundation.org, chegu_vinod@hp.com, linux-kernel@vger.kernel.org, Intel Graphics Development Date: Tue, 17 Jun 2014 08:04:52 +0100 In-Reply-To: <1402983303.3707.94.camel@ul30vt.home> References: <20140613162901.4550.94476.stgit@bling.home> <1402983303.3707.94.camel@ul30vt.home> Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-lGTPeRK2STXRkiUEePjF" X-Mailer: Evolution 3.10.4 (3.10.4-2.fc20) 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 --=-lGTPeRK2STXRkiUEePjF Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2014-06-16 at 23:35 -0600, Alex Williamson wrote: >=20 > Any idea what an off-the-shelf Asus motherboard would be doing with an > RMRR on the Intel HD graphics? >=20 > dmar: RMRR base: 0x000000bb800000 end: 0x000000bf9fffff > IOMMU: Setting identity map for device 0000:00:02.0 [0xbb800000 - 0xbf9ff= fff] Hm, we should have thought of that sooner. That's quite normal =E2=80=94 it= 's for the 'stolen' memory used for the framebuffer. And maybe also the GTT, and shadow GTT and other things; I forget precisely what, and it varies from one setup to another. I'd expect fairly much all systems to have an RMRR for the integrated graphics device if they have one, and your patch=C2=B9 is going to prevent assignment of those to guests... as you've presumably noticed. I'm not sure if the i915 driver is capable of fully reprogramming the hardware to completely stop using that region, to allow assignment to a guest with a 'pure' memory map and no stolen region. I suppose it must, if assignment to guests was working correctly before? Perhaps the better answer here is not to have the special cases in 'device_is_rmrr_locked()', and instead allow a device driver to call a 'iommu_release_rmrrs()' function once it's reset the hardware to *stop* doing whatever DMA the BIOS set it up with. --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation =C2=B9 Alex's patch prevents assignment to VM guests of *any* device which = has RMRRs (reserved regions requiring an IOMMU 1:1 mapping) in its DMAR table. --=-lGTPeRK2STXRkiUEePjF Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISxDCCBjQw ggQcoAMCAQICAR4wDQYJKoZIhvcNAQEFBQAwfTELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0YXJ0 Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcxKTAn BgNVBAMTIFN0YXJ0Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MB4XDTA3MTAyNDIxMDE1NVoX 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