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kvm: Add missing bits to support live migration

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This patch adds the missing hooks to allow live migration in KVM mode.
It adds proper synchronization before/after saving/restoring the VCPU
states (note: PPC is untested), hooks into
cpu_physical_memory_set_dirty_tracking() to enable dirty memory logging
at KVM level, and synchronizes that drity log into QEMU's view before
running ram_live_save().

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Jan Kiszka 2009-05-02 00:22:51 +02:00 • committed by Anthony Liguori
parent 151f7749f2
commit b0a46a333a
4 changed files with 21 additions and 1 deletions
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7
vl.c
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@ -3232,13 +3232,18 @@ static int ram_save_live(QEMUFile *f, int stage, void *opaque)
{
ram_addr_t addr;
if (cpu_physical_sync_dirty_bitmap(0, last_ram_offset) != 0) {
qemu_file_set_error(f);
return 0;
}
if (stage == 1) {
/* Make sure all dirty bits are set */
for (addr = 0; addr < last_ram_offset; addr += TARGET_PAGE_SIZE) {
if (!cpu_physical_memory_get_dirty(addr, MIGRATION_DIRTY_FLAG))
cpu_physical_memory_set_dirty(addr);
}
/* Enable dirty memory tracking */
cpu_physical_memory_set_dirty_tracking(1);