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[v2,0/4] powerpc/pseries/vas: VAS/NXGZIP support with LPM

Message ID d977832373068e57a13c0e2e47afb2dd4e8d7c3d.camel@linux.ibm.com (mailing list archive)
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Series powerpc/pseries/vas: VAS/NXGZIP support with LPM | expand

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Haren Myneni Feb. 6, 2022, 2:25 a.m. UTC 
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(-)