[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH V4 3/7] libxl: add pvusb API
George Dunlap writes ("Re: [Xen-devel] [PATCH V4 3/7] libxl: add pvusb API"): > On Tue, Jun 16, 2015 at 12:19 PM, Juergen Gross <jgross@xxxxxxxx> wrote: > > I'm pretty sure this is just a matter of timing during boot: the busses > > are all (or at least some of them) queried at the same time and the > > first answering gets number 1, the next 2, and so on. And timing seems > > to be different enough to result in unstable bus numbers. > > Right -- I meant "stable in topology within one boot", but at least > two of you have now understood me to mean "across reboots" by default, > so that's obviously a detail that needs to be specified. :-) I think "stable in topology within one boot" is nearly vacuous (or are we expecting buses or devices to spontaneously renumber themselves for no reason) and also nearly useless. We definitely need _some_ way for a user to identify a specific device uniquely in a way that is reliable from one boot to the next. vid:pid is one way to do this, but not always sufficient. Ian. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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