Architectures already provide custom cpu data via elf notes but there's currently no way for an architecture to add other custom data to dumps.
s390x for instance needs to store special data in the dump when dumping protected guests so the vm owner can decrypt the dump and access the vm data. Similar to the cpu notes which work by using hooks we introduce new hooks to add custom sections. The ArchDumpInfo struct now contains three new functions hooks that the architectures can set: void (*arch_sections_add_fn)(void *opaque); This function can be used to manipulate the number of sections and the size of the cummulative section data. uint64_t (*arch_sections_write_hdr_fn)(void *opaque, uint8_t *buff); This function is used to write the elf headers for the custom sections so architectures can control all values in the section headers. void (*arch_sections_write_fn)(void *opaque, uint8_t *buff); Lastly this function is used to write out the section data. To make section identification easier we also introduce section string table support. Based on: https://lore.kernel.org/qemu-devel/20220310110854.2701-1-fran...@linux.ibm.com/T/#t Janosch Frank (5): dump: Allocate header dump: Split write of section headers and data and add a prepare step dump: Reorder struct DumpState dump/dump: Add section string table support dump/dump: Add arch section support dump/dump.c | 338 +++++++++++++++++++++++++++---------- include/sysemu/dump-arch.h | 27 +++ include/sysemu/dump.h | 24 ++- 3 files changed, 294 insertions(+), 95 deletions(-) -- 2.32.0
