kdevops has support bringing up a CXL development environment and testing. This documents this support.
Current support for CXL on kdevops relies on vagrant, support for libguestfs is currently under investigation but will rely on using a python script to dynamically create XML requirements. The documentation below assumes vagrant will be used for now.
You can either use virtualized CXL devices or you can use PCIe passthrough to passthrough real devices onto your guests. kdevops support different CXL topologies and allows you to easily build new ones.
Using CXL today means you have to build QEMU as most devices are not yet available on the market, let alone CPUs which have support for them. CXL in qemu is also is in a large state of flux and so we enable the best qemu versions available for the latest and greatest.
kdevops supports building QEMU for you.To ramp up with CXL (other than bringup and the above linux target) just run:
make cxlmake cxl-test-probemake cxl-test-meson
This will use b4 to get some R&D patches for CXL switches.
make defconfig-cxl-switchmake -j$(nproc)make bringupmake linuxmake cxl