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dump: populate guest_phys_blocks

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While the machine is paused, in guest_phys_blocks_append() we register a
one-shot MemoryListener, solely for the initial collection of the valid
guest-physical memory ranges that happens at listener registration time.

For each range that is reported to guest_phys_blocks_region_add(), we
attempt to merge the range with the preceding one.

Ranges can only be joined if they are contiguous in both guest-physical
address space, and contiguous in host virtual address space.

The "maximal" ranges that remain in the end constitute the guest-physical
memory map that the dump will be based on.

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 12:37:10 +02:00 • committed by Luiz Capitulino
parent 5ee163e8ea
commit c5d7f60f06
3 changed files with 86 additions and 1 deletions
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2
dump.c
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@ -746,7 +746,7 @@ static int dump_init(DumpState *s, int fd, bool paging, bool has_filter,
s->length = length;
guest_phys_blocks_init(&s->guest_phys_blocks);
/* FILL LIST */
guest_phys_blocks_append(&s->guest_phys_blocks);
s->start = get_start_block(s);
if (s->start == -1) {