Hi, Srinivasan and Dexuan, I have a question to the hv_vtl_real_mode_header in arch/x86//hyperv/hv_vtl.c when addressing one patch review comment. In hv_vtl_early_init(), the real_mode_header is set to hv_vtl_real_mode_header, but there is no setup to the real_mode_header, since the realmode_init() is marked x86_init_noop in hv_vtl_init_platform. How is the real_mode_header(in another word, hv_vtl_real_mode_header) used? Is it to meet the access requirement from do_boot_cpu(), so that real_mode_header->trampoline_start64 will work, although the start_ip is not used? If it's really to support the do_boot_cpu() requirement, how does the non-VTL guest meet the access requirement? The hv_vtl_init_platform() is unconditionally called from ms_hyperv_init_platform(), so I assume all hyperv guest will have the realmode_init() set as x86_init_noop. Thank you --jyh
