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> Date: Fri, 8 Feb 2008 16:16:34 -0800> From: [EMAIL PROTECTED]> To: [EMAIL
> PROTECTED]> CC: [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL PROTECTED];
> [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL PROTECTED];
> [EMAIL PROTECTED]; kvm-devel@lists.sourceforge.net; [EMAIL PROTECTED]; [EMAIL
> PROTECTED]; [EMAIL PROTECTED]> Subject: Re: [ofa-general] Re: [patch 0/6] MMU
> Notifiers V6> > On Fri, 8 Feb 2008, Roland Dreier wrote:> > > In general,
> this MMU notifier stuff will only be useful to a subset of> > InfiniBand/RDMA
> hardware. Some adapters are smart enough to handle> > changing the IO virtual
> -> bus/physical mapping on the fly, but some> > aren't. For the dumb
> adapters, I think the current ib_umem_get() is> > pretty close to as good as
> we can get: we have to keep the physical> > pages pinned for as long as the
> adapter is allowed to DMA into the> > memory region.> > I thought the adaptor
> can always remove the mapping by renegotiating > with the remote side? Even
> if its dumb then a callback could notify the > driver that it may be required
> to tear down the mapping. We then hold the > pages until we get okay by the
> driver that the mapping has been removed.> > We could also let the unmapping
> fail if the driver indicates that the > mapping must stay.> --> To
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