Alejandro Lucero Palau wrote: [..] > I will take a look at this presentation, but I think there could be > another option where accelerators information is obtained during pci > enumeration by the kernel and using this information by this > functionality skipping those ranges allocated to them. Forcing them to > be compiled with the kernel would go against what distributions > currently and widely do with initramfs. Not sure if some current "early" > stubs could be used for this though but the information needs to be > recollected before this code does the checks.
The simple path is "do not use EFI_MEMORY_SP for accelerator memory". However, if the accelerator wants to publish memory as EFI_MEMORY_SP then it needs to coordinate with the kernel's default behavior somehow. That means expanding the list of drivers that dax_hmem needs to await before it can make a determination, or teaching dax_hmem to look for a secondary indication that it should never fall back to the default behavior. Talk to your AMD peers Paul and Rajneesh about their needs. I took it on faith that the use case was required.
