Hello Zhi,
On 9/21/24 09:14, Zhi Wang wrote:
> 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/
I have started looking at the software stack and the QEMU trees
are quite old. Could you please rebase the branches on the latest ?
Also, I think having a single branch per project would be easier.
For linux :
[v2] cxl: add Type2 device support
[RFC] vfio: introduce vfio-cxl to support CXL type-2
[RFC] samples: introduce QEMU CXL accel driver
Same for QEMU.
Thanks,
C.
>
> 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(+)
>