On Mon, 2014-09-08 at 11:20 +0200, Paolo Bonzini wrote: > Il 06/09/2014 01:19, Alexander Graf ha scritto: > >> > 1) interpretive execution of pci load/store instruction. If we use this > >> > function > >> > pci access does not get intercepted (no SIE exit) but is handled via > >> > microcode. > >> > To enable this we have to disable zpci device and enable it again > >> > with information > >> > from the SIE control block. > > Hrm. So how about you create a special vm ioctl for KVM that allows you > > to attach a VFIO device fd into the KVM VM context? Then the default > > would stay "accessible by mmap traps", but we could accelerate it with KVM. > > There is already KVM_DEV_VFIO_GROUP_ADD and KVM_DEV_VFIO_GROUP_DEL. > > Right now, they result in a call to kvm_arch_register_noncoherent_dma or > kvm_arch_unregister_noncoherent_dma, but you can add more hooks.
Eric Auger is also working on a patch series to do IRQ forward control on ARM via the kvm-vfio pseudo device, extending the interface to register VFIO device fds. Sounds like that may be a good path to follow here too. Thanks, Alex -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
