Hi Jonathan Thanks for your reply!
On Mon, Aug 8, 2022 at 8:37 PM Jonathan Cameron <jonathan.came...@huawei.com> wrote: > > Probably not related to your problem, but there is a disconnect in QEMU / > kernel assumptionsaround the presence of an HDM decoder when a HB only > has a single root port. Spec allows it to be provided or not as an > implementation choice. > Kernel assumes it isn't provide. Qemu assumes it is. > > The temporary solution is to throw in a second root port on the HB and not > connect anything to it. Longer term I may special case this so that the > particular > decoder defaults to pass through settings in QEMU if there is only one root > port. > You are right! After adding an extra HB in qemu, I can create a x1 region successfully. But have some errors in Nvdimm: [ 74.925838] Unknown online node for memory at 0x10000000000, assuming node 0 [ 74.925846] Unknown target node for memory at 0x10000000000, assuming node 0 [ 74.927470] nd_region region0: nmem0: is disabled, failing probe And x4 region still failed with same errors, using latest cxl/preview branch don't work. I have picked "Two CXL emulation fixes" patches in qemu, still not working. Bob
