From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTP id 51237711 for ; Tue, 13 May 2014 11:27:38 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id AD4AB20271 for ; Tue, 13 May 2014 11:27:37 +0000 (UTC) Message-ID: <1399980453.879.177.camel@i7.infradead.org> From: David Woodhouse To: Daniel Vetter Date: Tue, 13 May 2014 12:27:33 +0100 In-Reply-To: References: <1399552623.17118.22.camel@i7.infradead.org> <3908561D78D1C84285E8C5FCA982C28F328000EE@ORSMSX114.amr.corp.intel.com> <1399666748.2166.68.camel@dabdike.int.hansenpartnership.com> <4433093.MSzoqdJDMf@avalon> <20140512150722.GO12376@8bytes.org> Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-p8WniceFtMWGBK77hmDX" Mime-Version: 1.0 Cc: James Bottomley , "ksummit-discuss@lists.linuxfoundation.org" Subject: Re: [Ksummit-discuss] [CORE TOPIC] Device error handling / reporting / isolation List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , --=-p8WniceFtMWGBK77hmDX Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2014-05-12 at 19:04 +0200, Daniel Vetter wrote: > On Mon, May 12, 2014 at 6:16 PM, Andy Lutomirski wr= ote: > > Just to check: are you talking about disabling the IOMMU if there's a > > fault storm or disabling reporting of IOMMU faults? >=20 > Re-enabling of the IOMMU after it was completely shut off to isolate a > fault storm from a rouge device. Since if I as a developer still have > to reboot if I wreak havoc in my driver it's only marginally better > than a box that went down in a iommu page fault storm. But if I can > just reload the driver (with the bug fixed) and get back a working > device because the IOMMU was re-enabling then that would help. Not > sure yet how feasible this really is. You probably don't want to completely isolate it in that case. If it's doing some bad DMA *and* it's also doing some good DMA to display its framebuffer, why stop the latter? The Intel IOMMU at least can be configured to avoid reporting faults for a given device (well, requester-id). So valid transactions still happen, while invalid transactions are still blocked. But silently, without bothering the host with the details and causing a fault-IRQ storm. --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-p8WniceFtMWGBK77hmDX Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISxDCCBjQw ggQcoAMCAQICAR4wDQYJKoZIhvcNAQEFBQAwfTELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0YXJ0 Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcxKTAn BgNVBAMTIFN0YXJ0Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MB4XDTA3MTAyNDIxMDE1NVoX DTE3MTAyNDIxMDE1NVowgYwxCzAJBgNVBAYTAklMMRYwFAYDVQQKEw1TdGFydENvbSBMdGQuMSsw KQYDVQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0aWZpY2F0ZSBTaWduaW5nMTgwNgYDVQQDEy9TdGFy dENvbSBDbGFzcyAxIFByaW1hcnkgSW50ZXJtZWRpYXRlIENsaWVudCBDQTCCASIwDQYJKoZIhvcN AQEBBQADggEPADCCAQoCggEBAMcJg8zOLdgasSmkLhOrlr6KMoOMpohBllVHrdRvEg/q6r8jR+EK 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