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Subject: Re: [virtio] [OASIS Issue Tracker] Issue Comment Edited: (VIRTIO-30) allow required features
OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org> writes: > [ http://tools.oasis-open.org/issues/browse/VIRTIO-30?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=34614#action_34614 ] > > Michael Tsirkin edited comment on VIRTIO-30 at 9/12/13 4:10 PM: > ---------------------------------------------------------------- > > a similar issue if some features or device configuration > field values are mutually exclusive. > we would want a way for device to report to driver > that it's trying to create an inconsistent configuration. > > > was (Author: mstsirkin): > a similar issue if some features are mutually exclusive. > we would want a way for device to report to driver > that it's trying to create an inconsistent configuration. Also, a device may choose not to be completely backwards compatible and it would be nice to give the guest a way of knowing that (eg. may only support event indexes). However, the reason a device would do this is to keep it simple. Thus adding a new mechanism to identify this problem may make it worse by adding complexity and over-engineering, for very little benefit. As to feature dependencies, there are many ways a driver can be flawed, and this is probably one of the lesser ones. The spec should clearly identify dependent features, though. I created VIRTIO-33 for the documentation issue, which we should do anyway. Cheers, Rusty.
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