From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: virtio-dev-return-7289-cohuck=redhat.com@lists.oasis-open.org Sender: List-Post: List-Help: List-Unsubscribe: List-Subscribe: Received: from lists.oasis-open.org (oasis-open.org [10.110.1.242]) by lists.oasis-open.org (Postfix) with ESMTP id CCA06985E9A for ; Fri, 8 May 2020 16:11:39 +0000 (UTC) From: Alex =?utf-8?Q?Benn=C3=A9e?= Date: Fri, 08 May 2020 17:11:36 +0100 Message-ID: <87sgga4daf.fsf@linaro.org> MIME-Version: 1.0 Subject: [virtio-dev] VIRTIO RPMB Front End drivers for Linux Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable To: virtio-dev@lists.oasis-open.org, Tomas Winkler , Yang Huang Cc: Bing Zhu , "Michael S. Tsirkin" , Ilias Apalodimas List-ID: Hi, I'm currently working on a vhost-user backend for virto-rpmb as defined in the draft version of the OASIS spec (since 8c6acac2). I'm developing it within the QEMU source tree but it is intended to be a portable vhost-user binary with minimal POSIX like dependencies. Part of the aim of the project is to experiment with a vhost-user backend that has minimal access to guest memory and RPMB makes sense as the vhost-user daemon only really needs to see the virt queues to pass the data back and forth. One eventual architecture would be to move the vhost-user driver into it's own isolated VM with only minimal memory sharing between the guest and it's back-end. I've gotten enough of the plumbing working now that I'm ready to start implementing the RPMB spec itself. I've been looking for a front-end to use in testing and I found the Linux driver sitting in Project ACRN's guest kernel fork. With this kernel and VIRTIO_ID_RPMB tweaked to the standard based one I get far enough that the driver is initialised before my drivers falls over when an un-handled feature is requested (0x130000000). This is slightly confusing because the spec doesn't define any feature bits. So a few questions: - how divergent is the virtio-rpmb front/back-end in ACRN from the OASIS spec? - is there likely to be another submission to the upstream kernel? I've also read the document on the ACRN website which talks about the secure architecture: https://projectacrn.github.io/latest/tutorials/trustyACRN.html I was wondering if there was any low level usage information. From looking at the Kconfig options it seems the virtio-rpmb driver interfaces with a wider RPMB sub-system which exposes a character device to the kernels user-space. So: - are there any special user-space tools to use this interface? - is there a write-up somewhere of how to exercise the interface or any sort of test suite? Thanks in advance, --=20 Alex Benn=C3=A9e --------------------------------------------------------------------- To unsubscribe, e-mail: virtio-dev-unsubscribe@lists.oasis-open.org For additional commands, e-mail: virtio-dev-help@lists.oasis-open.org