1 .. SPDX-License-Identifier: GPL-2.0 2 3 Acceptance criteria for vfio-pci device specific driver variants 4 ================================================================ 5 6 Overview 7 -------- 8 The vfio-pci driver exists as a device agnostic driver using the 9 system IOMMU and relying on the robustness of platform fault 10 handling to provide isolated device access to userspace. While the 11 vfio-pci driver does include some device specific support, further 12 extensions for yet more advanced device specific features are not 13 sustainable. The vfio-pci driver has therefore split out 14 vfio-pci-core as a library that may be reused to implement features 15 requiring device specific knowledge, ex. saving and loading device 16 state for the purposes of supporting migration. 17 18 In support of such features, it's expected that some device specific 19 variants may interact with parent devices (ex. SR-IOV PF in support of 20 a user assigned VF) or other extensions that may not be otherwise 21 accessible via the vfio-pci base driver. Authors of such drivers 22 should be diligent not to create exploitable interfaces via these 23 interactions or allow unchecked userspace data to have an effect 24 beyond the scope of the assigned device. 25 26 New driver submissions are therefore requested to have approval via 27 sign-off/ack/review/etc for any interactions with parent drivers. 28 Additionally, drivers should make an attempt to provide sufficient 29 documentation for reviewers to understand the device specific 30 extensions, for example in the case of migration data, how is the 31 device state composed and consumed, which portions are not otherwise 32 available to the user via vfio-pci, what safeguards exist to validate 33 the data, etc. To that extent, authors should additionally expect to 34 require reviews from at least one of the listed reviewers, in addition 35 to the overall vfio maintainer.
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