On Thu, Aug 20, 2015 at 04:55:08PM +0800, Zhiyuan Lv wrote: > Hi Chris, > > On Thu, Aug 20, 2015 at 09:34:05AM +0100, Chris Wilson wrote: > > On Thu, Aug 20, 2015 at 03:45:20PM +0800, Zhiyuan Lv wrote: > > > Broadwell hardware supports both ring buffer mode and execlist mode. > > > When i915 runs inside a VM with Intel GVT-g, we allow execlist mode > > > only. The reason is that GVT-g does not support the dynamic mode > > > switch between ring buffer mode and execlist mode when running > > > multiple virtual machines. Consider that ring buffer mode is legacy > > > mode, it makes sense to drop it inside virtual machines. > > > > If that is the case, you should query the host as to what mode it is > > running. > > Thanks for the reply! You mean we query the host mode, then tell the > guest driver inside VM, so that it could use the same mode as host > right? That might be a little complicated, and the only benefit is to > support legacy ring buffer mode ... The only benefit being that the guest works no matter what the host does? -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
