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[PATCH 0/8] hw/cxl: Move CXL emulation options and state to machines.
From: |
Jonathan Cameron |
Subject: |
[PATCH 0/8] hw/cxl: Move CXL emulation options and state to machines. |
Date: |
Mon, 30 May 2022 14:45:06 +0100 |
Currently only machine with CXL support upstream is i386/pc but arm/virt
patches have been posted and once this is merged an updated series will
follow. Switch support is queued behind this as well because they both
include documentation updates.
Paolo Bonzini highlighted a couple of issues with the current CXL
emulation code.
* Top level parameter rather than machine for fixed memory windows
The --cxl-fixed-memory-window top level command line parameters won't play
well with efforts to make it possible to instantiate entire machines via
RPC. Better to move these to be machine configuration. This change is
relatively straight forward, but does result in very long command lines
(cannot break fixed window setup into multiple -M entries).
* Move all CXL stuff to machine specific code and helpers
To simplify the various interactions between machine setup and host
bridges etc, currently various CXL steps are called from the generic
core/machine.c and softmmu/vl.c + there are CXL elements in MachineState.
Much of this is straight forward to do with one exception:
The CXL pci_expander_bridge host bridges require MMIO register space.
This series does this by walking the bus and filling the register space
in via the machine_done callback. This is similar to the walk done for
identifying host bridges in the ACPI building code but it is rather ugly
and postpones rejection of PXB_CXL instances where cxl=off (default).
All comments welcome, but the first patch at least changes the command-line
so to avoid have to add backwards compatibility code, it would be great
to merge that before 7.1 is released.
Run through the CI at:
https://gitlab.com/jic23/qemu/-/pipelines/551206618
(rerunning a few test cases that timed out, but all passed for the
full tree with arm/virt and switch support, so should be fine)
Thanks,
Jonathan
Jonathan Cameron (8):
hw/cxl: Make the CXL fixed memory window setup a machine parameter.
hw/acpi/cxl: Pass in the CXLState directly rather than MachineState
hw/cxl: Push linking of CXL targets into i386/pc rather than in
machine.c
tests/acpi: Allow modification of q35 CXL CEDT table.
pci/pci_expander_bridge: For CXL HB delay the HB register memory
region setup.
tests/acpi: Update q35/CEDT.cxl for new memory addresses.
hw/cxl: Move the CXLState from MachineState to machine type specific
state.
hw/machine: Drop cxl_supported flag as no longer useful
docs/system/devices/cxl.rst | 4 +-
hw/acpi/cxl.c | 9 +--
hw/core/machine.c | 28 -------
hw/cxl/cxl-host-stubs.c | 8 +-
hw/cxl/cxl-host.c | 80 +++++++++++++++++---
hw/i386/acpi-build.c | 8 +-
hw/i386/pc.c | 44 ++++++++---
hw/pci-bridge/meson.build | 5 +-
hw/pci-bridge/pci_expander_bridge.c | 32 +++++---
hw/pci-bridge/pci_expander_bridge_stubs.c | 14 ++++
include/hw/acpi/cxl.h | 5 +-
include/hw/boards.h | 3 +-
include/hw/cxl/cxl.h | 9 +--
include/hw/cxl/cxl_host.h | 22 ++++++
include/hw/i386/pc.h | 2 +
include/hw/pci-bridge/pci_expander_bridge.h | 12 +++
qapi/machine.json | 13 ++++
softmmu/vl.c | 46 -----------
tests/data/acpi/q35/CEDT.cxl | Bin 184 -> 184 bytes
tests/qtest/bios-tables-test.c | 4 +-
tests/qtest/cxl-test.c | 4 +-
21 files changed, 213 insertions(+), 139 deletions(-)
create mode 100644 hw/pci-bridge/pci_expander_bridge_stubs.c
create mode 100644 include/hw/cxl/cxl_host.h
create mode 100644 include/hw/pci-bridge/pci_expander_bridge.h
--
2.32.0
- [PATCH 0/8] hw/cxl: Move CXL emulation options and state to machines.,
Jonathan Cameron <=
- [PATCH 1/8] hw/cxl: Make the CXL fixed memory window setup a machine parameter., Jonathan Cameron, 2022/05/30
- [PATCH 2/8] hw/acpi/cxl: Pass in the CXLState directly rather than MachineState, Jonathan Cameron, 2022/05/30
- [PATCH 3/8] hw/cxl: Push linking of CXL targets into i386/pc rather than in machine.c, Jonathan Cameron, 2022/05/30
- [PATCH 4/8] tests/acpi: Allow modification of q35 CXL CEDT table., Jonathan Cameron, 2022/05/30
- [PATCH 5/8] pci/pci_expander_bridge: For CXL HB delay the HB register memory region setup., Jonathan Cameron, 2022/05/30
- [PATCH 6/8] tests/acpi: Update q35/CEDT.cxl for new memory addresses., Jonathan Cameron, 2022/05/30
- [PATCH 7/8] hw/cxl: Move the CXLState from MachineState to machine type specific state., Jonathan Cameron, 2022/05/30
- [PATCH 8/8] hw/machine: Drop cxl_supported flag as no longer useful, Jonathan Cameron, 2022/05/30