From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 2D0C61ADC6D; Fri, 21 Mar 2025 18:42:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742582573; cv=none; b=hiyTJk/DU4QuT/WZ+PFFiNPNO7fGePHK12ObhOP2f1UoCpqc5wSyO7jH08EoTZt5EjdTbhxsPkX6Wbnh1DRLpJRtku8uJLCrIUzBUuldWPxT7CXE0L0U478LI6l6a25YP5yBHK5YxE1JUPcmtqFmp/hf+xrmFULxYUiEZ4zpyVE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742582573; c=relaxed/simple; bh=6p9/xCFwuiZLdlnx3CHna7SmFJBXvkdGfKbhrFQIG0k=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=GzDQ6b6y4mTBQ6+RKXu30VLi4f0G13GQR9J9yP05pmMrU8BKAjsglP8aVDMDcD5wKRrS8s9w+Qiomk1J0e83Oa6uGk+tQXfQlmvlpwvshEIDZDw7blvxHp4QUmG7tsx2rMZyxb6tY1WumT9nPgLuNohugAPfiCSq3oshBY6Bg8A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=desiato.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=ZM2XwXtA; arc=none smtp.client-ip=90.155.92.199 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=desiato.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="ZM2XwXtA" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; 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=6p9/xCFwuiZLdlnx3CHna7SmFJBXvkdGfKbhrFQIG0k=; b=ZM2XwXtAnlCfsKo0XNxstP2jSG U865vPXju9/sBv+RnSL1oLUhFaTt2GFwko2fe13ZTxN5XgbKStRgAAR78S0c8riUBjLDHxGGFTN5Q IQA4Yi+4+rZ1VNApBOPqo7TyG2AJozAp9crvsFlBasJmN1P5+A7mtenETUUxqwfBL+zH+cZmbIYLr z7cSt9GR1dDsUHs+EJK9M+UxkQ6+mlITOdRL0A3LxKgHPzuJ5TZVQYJ/rn2uCfWHQp3OCwzyzp8bt Ww29Q/jlsLm3WtWuqretBM4DoH7lfYgqvIceQ+Kh7p6DoVlSSAYtY5sYDJJFhZ6ik+JXg10G+yCzE Wt0j8Uxw==; Received: from [172.31.31.145] (helo=u09cd745991455d.ant.amazon.com) by desiato.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tvhK0-00000004VRm-4BjR; Fri, 21 Mar 2025 18:42:21 +0000 Message-ID: Subject: Re: Using Restricted DMA for virtio-pci From: David Woodhouse To: "Michael S. Tsirkin" Cc: Claire Chang , Rob Herring , mpe@ellerman.id.au, Joerg Roedel , Will Deacon , Frank Rowand , Konrad Rzeszutek Wilk , boris.ostrovsky@oracle.com, jgross@suse.com, Christoph Hellwig , Marek Szyprowski , heikki.krogerus@linux.intel.com, peterz@infradead.org, benh@kernel.crashing.org, grant.likely@arm.com, paulus@samba.org, mingo@kernel.org, sstabellini@kernel.org, Saravana Kannan , xypron.glpk@gmx.de, "Rafael J . Wysocki" , Bartosz Golaszewski , xen-devel@lists.xenproject.org, Thierry Reding , linux-devicetree , linuxppc-dev@lists.ozlabs.org, Nicolas Boichat , Dan Williams , Andy Shevchenko , Greg KH , Randy Dunlap , lkml , "list@263.net:IOMMU DRIVERS" , Jim Quinlan , Robin Murphy , hch@infradead.org, Jason Wang , Xuan Zhuo , Eugenio =?ISO-8859-1?Q?P=E9rez?= , virtualization@lists.linux.dev, graf@amazon.de Date: Fri, 21 Mar 2025 18:42:20 +0000 In-Reply-To: <20250321142947-mutt-send-email-mst@kernel.org> References: <20210209062131.2300005-1-tientzu@chromium.org> <979b6a34ca5724ced1d4871b58bf227065d7da57.camel@infradead.org> <20250321142947-mutt-send-email-mst@kernel.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-9um69C3QOUe8WBwkTdXa" User-Agent: Evolution 3.52.3-0ubuntu1 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html --=-9um69C3QOUe8WBwkTdXa Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2025-03-21 at 14:32 -0400, Michael S. Tsirkin wrote: > On Fri, Mar 21, 2025 at 03:38:10PM +0000, David Woodhouse wrote: > > On Tue, 2021-02-09 at 14:21 +0800, Claire Chang wrote: > > > This series implements mitigations for lack of DMA access control on > > > systems without an IOMMU, which could result in the DMA accessing the > > > system memory at unexpected times and/or unexpected addresses, possib= ly > > > leading to data leakage or corruption. > >=20 > > Replying to an ancient (2021) thread which has already been merged... > >=20 > > I'd like to be able to use this facility for virtio devices. > >=20 > > Virtio already has a complicated relationship with the DMA API, because > > there were a bunch of early VMM bugs where the virtio devices where > > magically exempted from IOMMU protection, but the VMM lied to the guest > > and claimed they weren't. > >=20 > > With the advent of confidential computing, and the VMM (or whatever's > > emulating the virtio device) not being *allowed* to arbitrarily access > > all of the guest's memory, the DMA API becomes necessary again. > >=20 > > Either a virtual IOMMU needs to determine which guest memory the VMM > > may access, or the DMA API is wrappers around operations which > > share/unshare (or unencrypt/encrypt) the memory in question. > >=20 > > All of which is complicated and slow, if we're looking at a minimal > > privileged hypervisor stub like pKVM which enforces the lack of guest > > memory access from VMM. > >=20 > > I'm thinking of defining a new type of virtio-pci device which cannot > > do DMA to arbitrary system memory. Instead it has an additional memory > > BAR which is used as a SWIOTLB for bounce buffering. > >=20 > > The driver for it would look much like the existing virtio-pci device > > except that it would register the restricted-dma region first (and thus > > the swiotlb dma_ops), and then just go through the rest of the setup > > like any other virtio device. > >=20 > > That seems like it ought to be fairly simple, and seems like a > > reasonable way to allow an untrusted VMM to provide virtio devices with > > restricted DMA access. > >=20 > > While I start actually doing the typing... does anyone want to start > > yelling at me now? Christoph? mst? :) >=20 >=20 > I don't mind as such (though I don't understand completely), but since > this is changing the device anyway, I am a bit confused why you can't > just set the VIRTIO_F_ACCESS_PLATFORM feature bit?=C2=A0 This forces DMA = API > which will DTRT for you, will it not? That would be necessary but not sufficient. The question is *what* does the DMA API do? For a real passthrough PCI device, perhaps we'd have a vIOMMU exposed to the guest so that it can do real protection with two-stage page tables (IOVA=E2=86=92GPA under control of the guest, GPA=E2=86=92HPA under = control of the hypervisor). For that to work in the pKVM model though, you'd need pKVM to be talking the guest's stage1 I/O page tables to see if a given access from the VMM ought to be permitted? Or for confidential guests there could be DMA ops which are an 'enlightenment'; a hypercall into pKVM to share/unshare pages so that the VMM can actually access them, or SEV-SNP guests might mark pages unencrypted to have the same effect with hardware protection. Doing any of those dynamically to allow the VMM to access buffers in arbitrary guest memory (when it wouldn't normally have access to arbitrary guest memory) is complex and doesn't perform very well. And exposes a full 4KiB page for any byte that needs to be made available. Thus the idea of having a fixed range of memory to use for a SWIOTLB, which is fairly much what the restricted DMA setup is all about. We're just proposing that we build it in to a virtio-pci device model, which automatically uses the extra memory BAR instead of the restricted-dma-pool DT node. It's basically just allowing us to expose through PCI, what I believe we can already do for virtio in DT. --=-9um69C3QOUe8WBwkTdXa Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAeFw0yNDAxMzAwMDAwMDBaFw0zMTEx MDkyMzU5NTlaMEExCzAJBgNVBAYTAkFVMRAwDgYDVQQKEwdWZXJva2V5MSAwHgYDVQQDExdWZXJv a2V5IFNlY3VyZSBFbWFpbCBHMjCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMjvgLKj jfhCFqxYyRiW8g3cNFAvltDbK5AzcOaR7yVzVGadr4YcCVxjKrEJOgi7WEOH8rUgCNB5cTD8N/Et GfZI+LGqSv0YtNa54T9D1AWJy08ZKkWvfGGIXN9UFAPMJ6OLLH/UUEgFa+7KlrEvMUupDFGnnR06 aDJAwtycb8yXtILj+TvfhLFhafxroXrflspavejQkEiHjNjtHnwbZ+o43g0/yxjwnarGI3kgcak7 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