From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 411FE13C9B3; Mon, 7 Oct 2024 08:47:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728290880; cv=none; b=p5wY1sfVTnoL66wFQHUId2k7MxVmq/+pIpU0K40mArMrVpA5k3a0lAI8/T1ty4pobqHDyJtj0O0rwjZSGG3UCyZWuqjOzGflosoBMImywY2NbDftchHILcHQmXMePmwOkqDTV6YJ3cbA84xfREH3bLFRFq/R/2PRG4/XAq4p7H4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728290880; c=relaxed/simple; bh=3KYKc1HxVH6cMj/HxuWQdj+vd8w+IgU2y1GmBG3q43k=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=EnByVCaDIsfzKJkFKoZ4ppxcCX/j0Gatwrhi2E7INN/tRNFiYdXf7q36RIxvSLnuKPCRM2Z71nWu5N+lyoOrUtmG6tkrRouO/ZYH5cJqCCAL0wfxqfO28Ohdxt5dF8n+ZjkF/jgVLCtNoMY4S1cEGrG8ceUKauae03xeTJ6xvpw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=SsxZLOLb; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="SsxZLOLb" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=3KYKc1HxVH6cMj/HxuWQdj+vd8w+IgU2y1GmBG3q43k=; b=SsxZLOLbcuA2DSIVqxwroTUrIw lD4prWJV8xZKg+gdUV0uj3ae6urQDJ8+nGkB63NfvLOdcVgGDLNMjzki/4xI2ph6cxFVfzBMzEXOE VUy410mnoXevj1uGFCqUTpUe+dz4el3ho+b7E5hhTlbJ1dgaRPdTH8t3yAiPsAByKivFEfYYDuFyR KCRueyqeUHMxUk6myEFVLC3Q4zH8KLoyTE40UN3DAO52x7vsESj3sI1JdaR+vzNBqGTyp02fc8694 uS+ZG+5EHqO+MgGKQfgOdKlrg30nGEnEEqurBIo/VnYMYkeH5/FHSQ32tP257E4mwwj450vBLtEgi mS6hmjSA==; Received: from [2001:8b0:10b:5:2e47:989a:8186:4053] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1sxjPF-0000000H1Xp-0e5B; Mon, 07 Oct 2024 08:47:53 +0000 Message-ID: Subject: Re: [RFC PATCH 05/13] iommufd: Serialise persisted iommufds and ioas From: David Woodhouse To: "Gowans, James" , "jgg@ziepe.ca" Cc: "kvm@vger.kernel.org" , "rppt@kernel.org" , "kw@linux.com" , "iommu@lists.linux.dev" , "madvenka@linux.microsoft.com" , "anthony.yznaga@oracle.com" , "robin.murphy@arm.com" , "baolu.lu@linux.intel.com" , "nh-open-source@amazon.com" , "linux-kernel@vger.kernel.org" , "seanjc@google.com" , "Saenz Julienne, Nicolas" , "pbonzini@redhat.com" , "kevin.tian@intel.com" , "steven.sistare@oracle.com" , "Graf (AWS), Alexander" , "will@kernel.org" , "joro@8bytes.org" Date: Mon, 07 Oct 2024 09:47:53 +0100 In-Reply-To: References: <20240916113102.710522-1-jgowans@amazon.com> <20240916113102.710522-6-jgowans@amazon.com> <20241002185520.GL1369530@ziepe.ca> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-y6xNz/irdtdh6glTg8mA" User-Agent: Evolution 3.44.4-0ubuntu2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-y6xNz/irdtdh6glTg8mA Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2024-10-07 at 08:39 +0000, Gowans, James wrote: >=20 > I think we have two other possible approaches here: >=20 > 1. What this RFC is sketching out, serialising fields from the structs > and setting those fields again on deserialise. As you point out this > will be complicated. >=20 > 2. Get userspace to do the work: userspace needs to re-do the ioctls > after kexec to reconstruct the objects. My main issue with this approach > is that the kernel needs to do some sort of trust but verify approach to > ensure that userspace constructs everything the same way after kexec as > it was before kexec. We don't want to end up in a state where the > iommufd objects don't match the persisted page tables. To what extent does the kernel really need to trust or verify? At LPC we seemed to speak of a model where userspace builds a "new" address space for each device and then atomically switches to the new page tables instead of the original ones inherited from the previous kernel. That does involve having space for another set of page tables, of course, but that's not impossible. > 3. Serialise and reply the ioctls. Ioctl APIs and payloads should > (must?) be stable across kernel versions. If IOMMUFD records the ioctls > executed by userspace then it could replay them as part of deserialise > and give userspace a handle to the resulting objects after kexec. This > way we are guaranteed consistent iommufd / IOAS objects. By "consistent" > I mean they are the same as before kexec and match the persisted page > tables. By having the kernel do this it means it doesn't need to depend > on userspace doing the correct thing. >=20 > What do you think of this 3rd approach? I can try to sketch it out and > send another RFC if you think it sounds reasonable. --=-y6xNz/irdtdh6glTg8mA Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf 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