On Tue, Feb 23, 2021, Liu, Jing2 wrote: > XCOMP_BV[63] field indicates that the save area is in the > compacted format and XCOMP_BV[62:0] indicates the states that > have space allocated in the save area, including both XCR0 > and XSS bits enable by the host kernel. Use xfeatures_mask_all > for calculating xcomp_bv and reuse XCOMP_BV_COMPACTED_FORMAT > defined by kernel. Works for me, just please wrap at ~73-75 chars, not ~64. Thanks!