Virtual Accelerator Switchboard (VAS) is an engine stays on the
chip. So all windows opened on a specific engine belongs to VAS
the chip. The hypervisor expects the partition to close all
active windows on the sources system and reopen them after
migration on the destination machine.
This patch series adds VAS support with the partition migration.
When the migration initiates, the VAS migration handler will be
invoked before pseries_suspend() to close all active windows and
mark them in-active with VAS_WIN_MIGRATE_CLOSE status. Whereas
this migration handler is called after migration to reopen all
windows which has VAS_WIN_MIGRATE_CLOSE status and make them
active again. The user space gets paste instruction failure
when it sends requests on these in-active windows.
These patches depend on VAS/DLPAR support patch series
Changes in v2:
- Added new patch "Define global hv_cop_caps struct" to eliminate
memory allocation failure during migration (suggestion by
Nathan Lynch)
Haren Myneni (4):
powerpc/pseries/vas: Define global hv_cop_caps struct
powerpc/pseries/vas: Modify reconfig open/close functions for
migration
powerpc/pseries/vas: Add VAS migration handler
powerpc/pseries/vas: Disable window open during migration
arch/powerpc/include/asm/vas.h | 2 +
arch/powerpc/platforms/pseries/mobility.c | 5 +
arch/powerpc/platforms/pseries/vas.c | 236 +++++++++++++++++-----
arch/powerpc/platforms/pseries/vas.h | 6 +
4 files changed, 202 insertions(+), 47 deletions(-)
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2.27.0
