From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 3D061A00C5; Wed, 6 May 2020 18:51:24 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 58F881DA3C; Wed, 6 May 2020 18:51:23 +0200 (CEST) Received: from dispatch1-us1.ppe-hosted.com (dispatch1-us1.ppe-hosted.com [67.231.154.164]) by dpdk.org (Postfix) with ESMTP id B50DD1D901 for ; Wed, 6 May 2020 18:51:21 +0200 (CEST) Received: from mx1-us1.ppe-hosted.com (unknown [10.110.50.143]) by dispatch1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTP id 38CE92007E; Wed, 6 May 2020 16:51:21 +0000 (UTC) Received: from us4-mdac16-20.at1.mdlocal (unknown [10.110.49.202]) by mx1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTP id 37842800A4; Wed, 6 May 2020 16:51:21 +0000 (UTC) X-Virus-Scanned: Proofpoint Essentials engine Received: from mx1-us1.ppe-hosted.com (unknown [10.110.50.12]) by mx1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTPS id BACC840074; Wed, 6 May 2020 16:51:20 +0000 (UTC) Received: from webmail.solarflare.com (uk.solarflare.com [193.34.186.16]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mx1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTPS id 4646A40089; Wed, 6 May 2020 16:51:20 +0000 (UTC) Received: from [192.168.38.17] (10.17.10.39) by ukex01.SolarFlarecom.com (10.17.10.4) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Wed, 6 May 2020 17:51:13 +0100 To: Haiyue Wang , , , , , References: <20200305043311.17065-1-vattunuru@marvell.com> <20200506113524.30205-1-haiyue.wang@intel.com> <20200506113524.30205-3-haiyue.wang@intel.com> From: Andrew Rybchenko Autocrypt: addr=arybchenko@solarflare.com; keydata= mQINBF2681gBEACbdTxu8eLL3UX2oAelsnK9GkeaJeUYSOHPJQpV7RL/iaIskqTwBRnhjXt7 j9UEwGA+omnOmqQMpeQTb/F9Ma2dYE+Hw4/t/1KVjxr3ehFaASvwR4fWJfO4e2l/Rk4rG6Yi 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X-TM-AS-Result: No-11.672900-8.000000-10 X-TMASE-MatchedRID: oHOSwQSJZWhEgaBf5eVRwvZvT2zYoYOwC/ExpXrHizxsMPuLZB/IR4jw YzF1DjNPKLIZjka1nvcI0emILnGBKTCitzEOtuK1EcRh6j7d8SfOoAXTAVKONVIxScKXZnK0UG1 wDP3HbhLoDqj7gGcE5ihUVDP5o8Rr2mNWQRnjOjp+J3gtIe0gA0X+NKU+2Zr+Y4zJvUjGrxXbJM bTT9K/Ta3aC25avUuaY4pQ/oxFQy91v4XbKdxKcsGNvKPnBgOaAf1C358hdK+rZHMcVOhFSM7k8 S0div9wRIpasgDKarIw3q04xc4gVnsNaobLGn1N/DjBDFOzsmZ99ekRHlOQkfOXbmWr7LbhezKB ji0+3F55uL0wwcRml3Q6Qrzmb3Var99rdLdHEygr1glPpqgMGxiDIOPlOJG1T9xG+Pmy0/pE4kF oWg2GJmLyNtMjI4kVzAqyqtEsVhmPaFHMfVTC4Dl/1fD/GopdnCGS1WQEGtCO8R6rqACRhqu6xV HLhqfxIAcCikR3vq+j7e190Aeqv1goo2+e4tqWbDSix3eSd0TWw9lm1G07m3RheYq3j3cY X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--11.672900-8.000000 X-TMASE-Version: SMEX-12.5.0.1300-8.5.1020-25402.001 X-MDID: 1588783881-HrBqmgE58gxH Subject: Re: [dpdk-dev] [PATCH v13 2/2] eal: support for VFIO-PCI VF token X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 5/6/20 2:35 PM, Haiyue Wang wrote: > The kernel module vfio-pci introduces the VF token to enable SR-IOV > support since 5.7. > > The VF token can be set by a vfio-pci based PF driver and must be known > by the vfio-pci based VF driver in order to gain access to the device. > > Signed-off-by: Haiyue Wang > Acked-by: Anatoly Burakov Sorry, lost from my view new versions of the patch series. Acked-by: Andrew Rybchenko > diff --git a/doc/guides/linux_gsg/linux_drivers.rst b/doc/guides/linux_gsg/linux_drivers.rst > index 238f3e900..910397243 100644 > --- a/doc/guides/linux_gsg/linux_drivers.rst > +++ b/doc/guides/linux_gsg/linux_drivers.rst > @@ -72,11 +72,44 @@ Note that in order to use VFIO, your kernel must support it. > VFIO kernel modules have been included in the Linux kernel since version 3.6.0 and are usually present by default, > however please consult your distributions documentation to make sure that is the case. > > +The ``vfio-pci`` module since Linux version 5.7 supports the creation of virtual > +functions. After the PF is bound to vfio-pci module, the user can create the VFs > +by sysfs interface, and these VFs are bound to vfio-pci module automatically. > + > +When the PF is bound to vfio-pci, it has initial VF token generated by random. For > +security reason, this token is write only, the user can't read it from the kernel > +directly. For accessing the VF, the user needs to start the PF with token parameter > +to setup a VF token (uuid format), then the VF can be accessed with this new known > +VF token. If token is write-only in kernel sysfs, shouldn't we make it invisible in ps output? I.e. substitute with something like xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. It is a bit easier with the new design. Just a thought. [snip]