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authorLaurent Vivier <lvivier@redhat.com>2017-01-27 13:24:58 +0100
committerDavid Gibson <david@gibson.dropbear.id.au>2017-01-31 10:10:14 +1100
commit42043e4f1241eeb77f87f5816b5cf0b6e9583ed7 (patch)
treeca574eb35c72dc637bfbf4d47d3d7bd3ea2f0159 /target
parentd9d6e78ea82b16a44fca0adf642ca5d5dad429d0 (diff)
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spapr: clock should count only if vm is running
This is a port to ppc of the i386 commit: 00f4d64 kvmclock: clock should count only if vm is running We remove timebase_post_load function, and use the VM state change handler to save and restore the guest_timebase (on stop and continue). We keep timebase_pre_save to reduce the clock difference on migration like in: 6053a86 kvmclock: reduce kvmclock difference on migration Time base offset has originally been introduced by commit 98a8b52 spapr: Add support for time base offset migration So while VM is paused, the time is stopped. This allows to have the same result with date (based on Time Base Register) and hwclock (based on "get-time-of-day" RTAS call). Moreover in TCG mode, the Time Base is always paused, so this patch also adjust the behavior between TCG and KVM. VM state field "time_of_the_day_ns" is now useless but we keep it to be able to migrate to older version of the machine. As vmstate_ppc_timebase structure (with timebase_pre_save() and timebase_post_load() functions) was only used by vmstate_spapr, we register the VM state change handler only in ppc_spapr_init(). Signed-off-by: Laurent Vivier <lvivier@redhat.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Diffstat (limited to 'target')
-rw-r--r--target/ppc/cpu-qom.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/target/ppc/cpu-qom.h b/target/ppc/cpu-qom.h
index d46c31a..b7977ba 100644
--- a/target/ppc/cpu-qom.h
+++ b/target/ppc/cpu-qom.h
@@ -214,6 +214,9 @@ extern const struct VMStateDescription vmstate_ppc_timebase;
.flags = VMS_STRUCT, \
.offset = vmstate_offset_value(_state, _field, PPCTimebase), \
}
+
+void cpu_ppc_clock_vm_state_change(void *opaque, int running,
+ RunState state);
#endif
#endif