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migration: Do not re-read the clock on pre_save in case of paused guest

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Re-read the timebase before migrate was ported from x86 commit:
   6053a86fe7: kvmclock: reduce kvmclock difference on migration

The clock move makes the guest knows about the paused time between
the stop and migrate commands. This is an issue in an already-paused
VM because some side effects, like process stalls, could happen
after migration.

So, this patch checks the runstate of guest in the pre_save handler and
do not re-reads the timebase in case of paused state (cold migration).

Signed-off-by: Maxiwell S. Garcia <maxiwell@linux.ibm.com>
Message-Id: <20190711194702.26598-1-maxiwell@linux.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Maxiwell S. Garcia 2019-07-11 16:47:02 -03:00 • committed by David Gibson
parent d15d4ad64f
commit d14f339762
2 changed files with 10 additions and 4 deletions
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1
target/ppc/cpu-qom.h
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@ -201,6 +201,7 @@ typedef struct PowerPCCPUClass {
typedef struct PPCTimebase {
uint64_t guest_timebase;
int64_t time_of_the_day_ns;
bool runstate_paused;
} PPCTimebase;
extern const VMStateDescription vmstate_ppc_timebase;