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Subject: Re: [virtio] Re: [virtio-comment] [PATCH v10 09/10] admin: conformance clauses
Wed, Mar 08, 2023 at 02:44:08PM CET, david.edmondson@oracle.com wrote: >Jiri Pirko <jiri@nvidia.com> writes: > >> Wed, Mar 08, 2023 at 01:59:10PM CET, david.edmondson@oracle.com wrote: >>>"Michael S. Tsirkin" <mst@redhat.com> writes: >>> >>>> On Tue, Mar 07, 2023 at 11:04:33AM +0000, David Edmondson wrote: >>>>> "Michael S. Tsirkin" <mst@redhat.com> writes: >>>>> > +The driver MAY block use of VIRTIO_ADMIN_CMD_LIST_QUERY and >>>>> > +VIRTIO_ADMIN_CMD_LIST_USE by issuing VIRTIO_ADMIN_CMD_LIST_USE >>>>> > +with respective bits cleared in \field{command_specific_data}. >>>>> >>>>> This runs contrary to the assertion "The list of supported commands MUST >>>>> NOT shrink", given that a driver is told to assume that >>>>> VIRTIO_ADMIN_CMD_LIST_QUERY and VIRTIO_ADMIN_CMD_LIST_USE are the only >>>>> commands initially available. >>>> >>>> Commands are still available just disabled, the meaning of >>>> "MUST NOT shrink" is clarified by the following: >>>> >>>> > > +after reporting a given command as supported through >>>> > > +VIRTIO_ADMIN_CMD_LIST_QUERY the device MUST NOT later report it >>>> > > +as unsupported. >>>> I will stick an "i.e." there to make it hopefully clearer. >>> >>>This puzzles me. >>> >>>I can see the point of blocking LIST_USE, but not of blocking >> >> What is that point, I'm curious. > >I might restrict the commands permitted by a device before handing it >off to some subordinate less trusted code. Hmm, that is theoretical, or is there a usecase for that? > >> >>>LIST_QUERY. What's the purpose of this? >> >> I think that this might be just for the sake of treating all >> commands equally. >> >> >>>-- >>>Time is waiting to explain, why refuse? >>> >>>--------------------------------------------------------------------- >>>To unsubscribe from this mail list, you must leave the OASIS TC that >>>generates this mail. Follow this link to all your TCs in OASIS at: >>>https://www.oasis-open.org/apps/org/workgroup/portal/my_workgroups.php >>> >-- >I used to get mad at my school, the teachers who taught me weren't cool.
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