On 05/08/2014 10:27 PM, Alexander Graf wrote: > On 05/06/2014 04:50 PM, Alexey Kardashevskiy wrote: >> On 05/01/2014 08:37 PM, Alexey Kardashevskiy wrote: >>> This allows guests to have a different timebase origin from the host. >>> >>> This is needed for migration, where a guest can migrate from one host >>> to another and the two hosts might have a different timebase origin. >>> However, the timebase seen by the guest must not go backwards, and >>> should go forwards only by a small amount corresponding to the time >>> taken for the migration. >>> >>> This is only supported for recent POWER hardware which has the TBU40 >>> (timebase upper 40 bits) register. That includes POWER6, 7, 8 but not >>> 970. >>> >>> This adds kvm_access_one_reg() to access a special register which is not >>> in env->spr. This requires kvm_set_one_reg/kvm_get_one_reg patch. >>> >>> The feature must be present in the host kernel. >>> >>> This bumps vmstate_spapr::version_id and enables new vmstate_ppc_timebase >>> only for it. Since the vmstate_spapr::minimum_version_id remains >>> unchanged, migration from older QEMU is supported but without >>> vmstate_ppc_timebase. >>> >>> Signed-off-by: Alexey Kardashevskiy <a...@ozlabs.ru> >>> --- >>> Changes: >>> v7: >>> * migration_duration_ns forced to be between [0...1s] >>> * s/tb/tb_remote/ >>> * time_of_the_day_ns is int64_t now as this is what get_clock_realtime() >>> returns >> Still bad? :) > > The dependency isn't fulfilled yet :)
Thanks to Cornelia, it is now! -- Alexey
