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dump: rebase from host-private RAMBlock offsets to guest-physical addresses

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RAMBlock.offset                   --> GuestPhysBlock.target_start
RAMBlock.offset + RAMBlock.length --> GuestPhysBlock.target_end
RAMBlock.length                   --> GuestPhysBlock.target_end -
                                      GuestPhysBlock.target_start

"GuestPhysBlock.host_addr" is only used when writing the dump contents.

This patch enables "crash" to work with the vmcore by rebasing the vmcore
from the left side of the following diagram to the right side:

host-private
offset
relative
to ram_addr   RAMBlock                  guest-visible paddrs
            0 +-------------------+.....+-------------------+ 0
              |         ^         |     |        ^          |
              |       640 KB      |     |      640 KB       |
              |         v         |     |        v          |
  0x0000a0000 +-------------------+.....+-------------------+ 0x0000a0000
              |         ^         |     |XXXXXXXXXXXXXXXXXXX|
              |       384 KB      |     |XXXXXXXXXXXXXXXXXXX|
              |         v         |     |XXXXXXXXXXXXXXXXXXX|
  0x000100000 +-------------------+.....+-------------------+ 0x000100000
              |         ^         |     |        ^          |
              |       3583 MB     |     |      3583 MB      |
              |         v         |     |        v          |
  0x0e0000000 +-------------------+.....+-------------------+ 0x0e0000000
              |         ^         |.    |XXXXXXXXXXXXXXXXXXX|
              | above_4g_mem_size | .   |XXXX PCI hole XXXXX|
              |         v         |  .  |XXXX          XXXXX|
     ram_size +-------------------+   . |XXXX  512 MB  XXXXX|
                                   .   .|XXXXXXXXXXXXXXXXXXX|
                                    .   +-------------------+ 0x100000000
                                     .  |         ^         |
                                      . | above_4g_mem_size |
                                       .|         v         |
                                        +-------------------+ ram_size
                                                              + 512 MB

Related RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=981582

Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
This commit is contained in:
Laszlo Ersek 2013-08-06 12:37:11 +02:00 • committed by Luiz Capitulino
parent c5d7f60f06
commit 56c4bfb3f0
7 changed files with 69 additions and 57 deletions
Download patch file Download diff file Expand all files Collapse all files

4
include/sysemu/dump.h
View file

@ -20,7 +20,9 @@ typedef struct ArchDumpInfo {
int d_class; /* ELFCLASS32 or ELFCLASS64 */
} ArchDumpInfo;
int cpu_get_dump_info(ArchDumpInfo *info);
struct GuestPhysBlockList; /* memory_mapping.h */
int cpu_get_dump_info(ArchDumpInfo *info,
const struct GuestPhysBlockList *guest_phys_blocks);
ssize_t cpu_get_note_size(int class, int machine, int nr_cpus);
#endif

7
include/sysemu/memory_mapping.h
View file

@ -68,10 +68,13 @@ void guest_phys_blocks_free(GuestPhysBlockList *list);
void guest_phys_blocks_init(GuestPhysBlockList *list);
void guest_phys_blocks_append(GuestPhysBlockList *list);
void qemu_get_guest_memory_mapping(MemoryMappingList *list, Error **errp);
void qemu_get_guest_memory_mapping(MemoryMappingList *list,
const GuestPhysBlockList *guest_phys_blocks,
Error **errp);
/* get guest's memory mapping without do paging(virtual address is 0). */
void qemu_get_guest_simple_memory_mapping(MemoryMappingList *list);
void qemu_get_guest_simple_memory_mapping(MemoryMappingList *list,
const GuestPhysBlockList *guest_phys_blocks);
void memory_mapping_filter(MemoryMappingList *list, int64_t begin,
int64_t length);