On Fri, Dec 14, 2018 at 04:29:02PM +1100, Suraj Jitindar Singh wrote: > This patch series allows for emulated devices to be passed through to nested > guests, irrespective of at which level the device is being emulated. > > Note that the emulated device must be using dma, not virtio. > > For example, passing through an emulated e1000: > > 1. Emulate the device at L(n) for L(n+1) > > qemu-system-ppc64 -netdev type=user,id=net0 -device e1000,netdev=net0 > > 2. Assign the VFIO-PCI driver at L(n+1) > > echo vfio-pci > /sys/bus/pci/devices/0000:00:00.0/driver_override > echo 0000:00:00.0 > /sys/bus/pci/drivers/e1000/unbind > echo 0000:00:00.0 > /sys/bus/pci/drivers/vfio-pci/bind > chmod 666 /dev/vfio/0 > > 3. Pass the device through from L(n+1) to L(n+2) > > qemu-system-ppc64 -device vfio-pci,host=0000:00:00.0 > > 4. L(n+2) can now access the device which will be emulated at L(n) > > V2 -> V3: > 1/8: None > 2/8: None > 3/8: None > 4/8: None > 5/8: None > 6/8: Add if def to fix compilation for some platforms > 7/8: None > 8/8: None > > Suraj Jitindar Singh (8): > KVM: PPC: Only report KVM_CAP_SPAPR_TCE_VFIO on powernv machines > KVM: PPC: Book3S HV: Add function kvmhv_vcpu_is_radix() > KVM: PPC: Book3S HV: Implement functions to access quadrants 1 & 2 > KVM: PPC: Add load_from_eaddr and store_to_eaddr to the kvmppc_ops > struct > KVM: PPC: Update kvmppc_st and kvmppc_ld to use quadrants > KVM: PPC: Book3S HV: Allow passthrough of an emulated device to an L2 > guest > KVM: PPC: Introduce new hcall H_COPY_TOFROM_GUEST to access quadrants > 1 & 2 > KVM: PPC: Book3S HV: Allow passthrough of an emulated device to an L3 > guest Thanks, series applied to my kvm-ppc-next branch. Paul.
