On Fri, 2 Sep 2016 14:18:47 +0800 Peter Xu <pet...@redhat.com> wrote:
> On Fri, Sep 02, 2016 at 02:15:57PM +0800, Peter Xu wrote: > > > No, implement the full notifier, and a listener which only wants the > > > invalidates can just ignore callbacks which add new mappings. > > > > > > As I said, you'll need this to get VFIO working with vIOMMU which > > > someone is bound to want soon enough anyway. > > > > But for vhost cases, we do not need CM bit enabled. That might be the > > difference? > > > > I think we need to have vhost working even without CM bit. Device > > IOTLB should be able to achieve that. > > The problem is that, IMHO we should be very careful on enabling CM > bit. After enabling it, system might get slower (though I haven't > tried it yet), or even very slow? So maybe we will only enable it when > really needed (e.g., to do device passthrough and build the shadow > table). Um.. what's the CM bit and what does it have to do with anything? -- David Gibson <dgib...@redhat.com> Senior Software Engineer, Virtualization, Red Hat
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