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[RFC,0/1] Introduce vfio-cxl to support CXL type-2 device passthrough

Message ID 20240921071440.1915876-1-zhiw@nvidia.com
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Series Introduce vfio-cxl to support CXL type-2 device passthrough | expand

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Zhi Wang Sept. 21, 2024, 7:14 a.m. UTC 
Compute Express Link (CXL) is an open standard interconnect built upon
industrial PCI layers to enhance the performance and efficiency of data
centers by enabling high-speed, low-latency communication between CPUs
and various types of devices such as accelerators, memory.

Although CXL is built upon the PCI layers, passing a CXL type-2 device can
be different than PCI devices according to CXL specification. Thus,
addtional changes on are required.

vfio-cxl is introduced to support the CXL type-2 device passthrough.
This is the QEMU VFIOStub draft changes to support it.

More details (patches, repos, kernel config) all what you need to test
and hack around, plus a demo video shows the kernel/QEMU command line
can be found at:
https://lore.kernel.org/kvm/20240920223446.1908673-7-zhiw@nvidia.com/T/

Zhi Wang (1):
  vfio: support CXL device in VFIO stub

 hw/vfio/common.c              |   3 +
 hw/vfio/pci.c                 | 134 ++++++++++++++++++++++++++++++++++
 hw/vfio/pci.h                 |  10 +++
 include/hw/pci/pci.h          |   2 +
 include/hw/vfio/vfio-common.h |   1 +
 linux-headers/linux/vfio.h    |  14 ++++
 6 files changed, 164 insertions(+)