This series allows to set up AMD XGBE passthrough. This was tested on AMD Seattle.
The first upstreamed device supporting KVM platform passthrough was the Calxeda Midway XGMAC. Compared to this latter, the XGBE XGMAC exposes a much more complex device tree node. - First There are 2 device tree node formats: one where XGBE and PHY are described in separate nodes and another one that combines both description in a single node (only supported by 4.2 onwards kernels). Only the combined description is supported for passthrough, meaning the host must be >= 4.2 and must feature a device tree with a combined description. The guest will also be exposed with a combined description, meaning only >= 4.2 guest are supported. It is not planned to support separate node representation since assignment of the PHY is less straigtforward. - the XGMAC/PHY node depends on 2 clock nodes (DMA and PTP). The code checks those clocks are fixed to make sure they cannot be switched off at some point after the native driver gets unbound. - there are many property values to populate on guest side. Most of them cannot be hardcoded. That series implements host device tree blob extraction from the host /proc/device-tree (inspired from dtc implementation) and retrieve host property values to populate guest dtb. - the case where the host uses ACPI is not yet covered since there is no usable ACPI description for this HW yet. The patches can be found at https://git.linaro.org/people/eric.auger/qemu.git/shortlog/refs/heads/v2.5.0-xgbe-v2 Previous version can be found at https://git.linaro.org/people/eric.auger/qemu.git/shortlog/refs/heads/v2.5.0-xgbe-v1 HISTORY: v1 -> v2: - take into account Peter's comments: - add CONFIG_LINUX protection - improve error handling and messages - no fixed size buffer anymore - fix read_fstree error handling - use /proc/device-tree symlink instead of /sys/firmware/devicetree/base - added hw/arm/sysbus-fdt: remove qemu_fdt_setprop returned value check - see individual commits for full details RFC -> v1: - no dependency anymore on dtc binary: load_device_tree_from_sysfs is self-contained and implements something similar to dtc read_fstree. - take into account Alex' comments - remove qemu_fdt_getprop_optional and use error API instead Best Regards Eric Eric Auger (7): hw/vfio/platform: amd-xgbe device device_tree: introduce load_device_tree_from_sysfs device_tree: introduce qemu_fdt_node_path device_tree: qemu_fdt_getprop converted to use the error API hw/arm/sysbus-fdt: helpers for clock node generation hw/arm/sysbus-fdt: enable amd-xgbe dynamic instantiation hw/arm/sysbus-fdt: remove qemu_fdt_setprop returned value check device_tree.c | 148 ++++++++++++++++++- hw/arm/sysbus-fdt.c | 306 ++++++++++++++++++++++++++++++++++++++-- hw/vfio/Makefile.objs | 1 + hw/vfio/amd-xgbe.c | 55 ++++++++ include/hw/vfio/vfio-amd-xgbe.h | 51 +++++++ include/sysemu/device_tree.h | 32 ++++- 6 files changed, 577 insertions(+), 16 deletions(-) create mode 100644 hw/vfio/amd-xgbe.c create mode 100644 include/hw/vfio/vfio-amd-xgbe.h -- 1.9.1
