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powerpc/pseries: Move vas_migration_handler early during migration 

When the migration is initiated, the hypervisor changes VAS
mappings as part of pre-migration event. Then the OS gets the
migration event which closes all VAS windows before the migration
starts. NX generates continuous faults until windows are closed
and the user space can not differentiate these NX faults coming
from the actual migration. So to reduce this time window, close
VAS windows first in pseries_migrate_partition().

Signed-off-by: Haren Myneni <haren@linux.ibm.com>
Reviewed-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/d8efade91dda831c9ed4abb226dab627da594c5f.camel@linux.ibm.com
This commit is contained in:
Haren Myneni 2022-09-22 01:27:07 -07:00 committed by Michael Ellerman
parent 1da5351f9e
commit 465dda9d32
1 changed files with 12 additions and 3 deletions
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15
arch/powerpc/platforms/pseries/mobility.c
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@ -740,11 +740,19 @@ static int pseries_migrate_partition(u64 handle)
#ifdef CONFIG_PPC_WATCHDOG
factor = nmi_wd_lpm_factor;
#endif
/*
* When the migration is initiated, the hypervisor changes VAS
* mappings to prepare before OS gets the notification and
* closes all VAS windows. NX generates continuous faults during
* this time and the user space can not differentiate these
* faults from the migration event. So reduce this time window
* by closing VAS windows at the beginning of this function.
*/
vas_migration_handler(VAS_SUSPEND);
ret = wait_for_vasi_session_suspending(handle);
if (ret)
return ret;
vas_migration_handler(VAS_SUSPEND);
goto out;
if (factor)
watchdog_nmi_set_timeout_pct(factor);
@ -765,6 +773,7 @@ static int pseries_migrate_partition(u64 handle)
if (factor)
watchdog_nmi_set_timeout_pct(0);
out:
vas_migration_handler(VAS_RESUME);
return ret;