[Crash-utility] question about qemu-generated vmcore

Hi all. As you know, I am implementing a new, dedicated memory dump mechanism. crash cannot get phys_base, because the guest may be in the kdump kernel. As Dave and hatayama suggested, I want to put extra CPU's information in PT_NOTE. For example: $ readelf -n vmcore Notes at offset 0x000001c8 with length 0x00000838: Owner Data size Description CORE 0x00000150 NT_PRSTATUS (prstatus structure) CORE 0x00000150 NT_PRSTATUS (prstatus structure) QEMU 0x00000557 Unknown note type: (0x00000000) QEMU 0x00000557 Unknown note type: (0x00000000) We put all CPU's information in the QEMU note. But I am not sure which informatin we should put in it. I think the following thing should be put in QEMU note: standard register: rax, rbx, rcx, rdx, rsi, rdi, rsp, rbp, r8, r9, r10, r11, r12, r13, r14, r15 segments: cs, ds, es, fs, gs, ss, ldt, tr, gdt, idt control register: cr0-cr5 other register: rip, rflags Hatayama suggested appending versions at the head of CPU's information. I agree with it, because CPU may have more registers in the future. Any other register or other information should be included in QEMU notes? Any suggestion is welcome. Thanks Wen Congyang