On 21-01-27 21:18:24, Igor Mammedov wrote: > On Tue, 26 Jan 2021 13:33:52 -0800 > Ben Widawsky <b...@bwidawsk.net> wrote: > > > I'm working on CXL 2.0 type 3 memory devices [1]. In short, these are PCIe > > devices > > that have persistent memory on them. As such, it would be nice to inherit > > from > > both a PCI_DEVICE class as well as an NVDIMM device class. > > > > Truth be told, using TYPE_MEMORY_DEVICE as the interface does provide most > > of > > what I need. > could you be more specific on what you need from it? >
I'm trying to register my persistent memory as normal system memory. I assume it's required that I implement the memory interface to do that. If it's not, that's fine too. For reference: https://gitlab.com/bwidawsk/qemu/-/blob/cxl-2.0v3/hw/mem/cxl_type3.c > >I'm wondering what the best way to handle this is. Currently, the > > only thing NVDIMM class provides is write/read_label_data, this is driven by > > _DSM. For CXL, the mechanism to read/write the equivalent area is not done > > via > > _DSM, but done directly via a mailbox interface. However, the intent is the > > same, and so utilizing similar code seems ideal. > > > > If there's a desire to unify these code paths, I'd need something like > > multiple > > inheritance. I'm looking for some feedback here on how to do it. > > > > Thanks. > > Ben > > > > [1]: > > https://lore.kernel.org/qemu-devel/20210105165323.783725-1-ben.widaw...@intel.com/ > > >
