The following allows support for component basic back invalidation discovery and config, by exposing the BI routing table and decoder registers. Instead of going the type2[0] route, this series proposes adding support for type3 hdm-db, which allows a more direct way of supporting BI in qemu.
Changes from v1 (https://lore.kernel.org/qemu-devel/20250806055708.196851-1-d...@stgolabs.net/): o Further lnk training in patch 1. (Jonathan) o Flit parameter changed to bool in patch 1. (Jonathan) o Do not set 68B in component Flexbus Port when in flitmode in patch 1. o Doc build fixlet in patch 3. o Pass the exact type3 type in cxl_component_create_dvsec() - unused, but better for keeping track, in patch 4. o Change doc example to volatile device in patch 4. Changes from rfc (https://lore.kernel.org/qemu-devel/20250729165441.1898150-1-d...@stgolabs.net/): o Added 256b-flit parameter, per Jonathan. o Added window restrictions changes. o Dropped rfc tag. Patch 1 introduces the flit mode parameter. Patch 2 is lifted from Ira's series with some small (but non-trivial) changes. Patch 3 updates the cfmw restrictions option. Patch 4 adds BI decoder/rt register support to enable type3 HDM-DB. Testing wise, this has passed relevant kernel side BI register IO flows for BI-ID setup and deallocation. The next step for this would be to add UIO support to qemu. Applies against branch 'origin/cxl-2025-07-03' from Jonathan's repository. Thanks! Davidlohr Bueso (3): hw/pcie: Support enabling flit mode hw/cxl: Allow BI by default in Window restrictions hw/cxl: Support type3 HDM-DB Ira Weiny (1): hw/cxl: Refactor component register initialization docs/system/devices/cxl.rst | 23 +++ hw/cxl/cxl-component-utils.c | 206 ++++++++++++++++------ hw/cxl/cxl-host.c | 2 +- hw/mem/cxl_type3.c | 23 ++- hw/pci-bridge/cxl_downstream.c | 11 +- hw/pci-bridge/cxl_root_port.c | 11 +- hw/pci-bridge/cxl_upstream.c | 19 +- hw/pci-bridge/gen_pcie_root_port.c | 1 + hw/pci/pcie.c | 23 ++- include/hw/cxl/cxl_component.h | 87 +++++++-- include/hw/cxl/cxl_device.h | 4 + include/hw/pci-bridge/cxl_upstream_port.h | 1 + include/hw/pci/pcie.h | 2 +- include/hw/pci/pcie_port.h | 1 + qapi/machine.json | 3 +- qemu-options.hx | 4 +- 16 files changed, 322 insertions(+), 99 deletions(-) -- 2.39.5
