On Fri, 2018-12-07 at 14:43 +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 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)
Note, [PATCH] KVM: PPC: Book3S PR: Set hflag to indicate that POWER9 supports 1T segments is not supposed to be part of this series > > 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 > > arch/powerpc/include/asm/hvcall.h | 1 + > arch/powerpc/include/asm/kvm_book3s.h | 10 ++- > arch/powerpc/include/asm/kvm_book3s_64.h | 13 ++++ > arch/powerpc/include/asm/kvm_host.h | 3 + > arch/powerpc/include/asm/kvm_ppc.h | 4 ++ > arch/powerpc/kernel/exceptions-64s.S | 9 +++ > arch/powerpc/kvm/book3s_64_mmu_radix.c | 97 > ++++++++++++++++++++++++++ > arch/powerpc/kvm/book3s_hv.c | 58 ++++++++++++++-- > arch/powerpc/kvm/book3s_hv_nested.c | 114 > +++++++++++++++++++++++++++++-- > arch/powerpc/kvm/powerpc.c | 28 +++++++- > arch/powerpc/mm/fault.c | 1 + > 11 files changed, 323 insertions(+), 15 deletions(-) >
