On 11/11/24 02:39, Kai Huang wrote: > TDX architecturally supports up to 32 CMRs. The global metadata field > "NUM_CMRS" reports the number of CMR entries that can be read by the > kernel. However, that field may just report the maximum number of CMRs > albeit the actual number of CMRs is smaller, in which case there are > tail null CMRs (size is 0). > > Trim away those null CMRs, and print valid CMRs since they are useful > at least to developers. > > More information about CMR can be found at "Intel TDX ISA Background: > Convertible Memory Ranges (CMRs)" in TDX 1.5 base spec [1], and > "CMR_INFO" in TDX 1.5 ABI spec [2]. > > Now get_tdx_sys_info() just reads kernel-needed global metadata to > kernel structure, and it is auto-generated. Add a wrapper function > init_tdx_sys_info() to invoke get_tdx_sys_info() and provide room to do > additional things like dealing with CMRs. I'm not sure I understand why this patch is here. What does trimming buy us in the first place?
