Steve Sistare <steven.sist...@oracle.com> wrote: > Add the cpr-reboot migration mode. Usage: > > $ qemu-system-$arch -monitor stdio ... > QEMU 8.1.50 monitor - type 'help' for more information > (qemu) migrate_set_capability x-ignore-shared on > (qemu) migrate_set_parameter mode cpr-reboot > (qemu) migrate -d file:vm.state > (qemu) info status > VM status: paused (postmigrate) > (qemu) quit > > $ qemu-system-$arch -monitor stdio -incoming defer ... > QEMU 8.1.50 monitor - type 'help' for more information > (qemu) migrate_set_capability x-ignore-shared on > (qemu) migrate_set_parameter mode cpr-reboot > (qemu) migrate_incoming file:vm.state > (qemu) info status > VM status: running > > In this mode, the migrate command saves state to a file, allowing one > to quit qemu, reboot to an updated kernel, and restart an updated version > of qemu. The caller must specify a migration URI that writes to and reads > from a file. Unlike normal mode, the use of certain local storage options > does not block the migration, but the caller must not modify guest block > devices between the quit and restart. To avoid saving guest RAM to the > file, the memory backend must be shared, and the @x-ignore-shared migration > capability must be set. Guest RAM must be non-volatile across reboot, such > as by backing it with a dax device, but this is not enforced. The restarted > qemu arguments must match those used to initially start qemu, plus the > -incoming option. > > Signed-off-by: Steve Sistare <steven.sist...@oracle.com>
Reviewed-by: Juan Quintela <quint...@redhat.com>
