Messages in this thread | | | From | Sheng Yang <> | Subject | Re: [Xen-devel] [PATCH 6/6] xen/hybrid: Enable grant table and xenbus | Date | Wed, 3 Feb 2010 00:46:41 +0800 |
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On Wednesday 03 February 2010 00:24:04 Ian Campbell wrote: > On Tue, 2010-02-02 at 13:24 +0000, Sheng Yang wrote: > > I am not sure if I understand you right, but I think the issue is, > > there is no PVonHVM drivers in Linux upstream. The drivers are > > currently maintained by OSVs, and the one in Xen upstream code only > > support 2.6.18. So I didn't take them into consideration at the time. > > True, but this is something which should be taken care of by the core > Xen-aware code not something which should be pushed down into each > driver. > > Someone who wants to add PVonHVM functionality shouldn't have to go and > remove a bunch of conditionals from each driver (or worse add > alternative clauses to each check!). > > > I think the "xen_evtchn_enable()" looks much better. Would replace > > these ugly lines in the next version. > > I think it would be cleaner to encapsulate this in the evtchn code > rather than leaking platform knowledge into each driver. IOW the evtchn > functions should return failure if event channels are not enabled and > the driver should cope with this gracefully.
Agree. That what I suppose to do. What the drivers should only know is, if event channel is enabled.
> Or perhaps at the xenbus driver level we should be deciding whether or > not we have enough paravirtualisation to be worth probing the drivers at > all?
I think current scheme is direct enough for now. We can improve it later.
-- regards Yang, Sheng
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