[RFC PATCH 0/3] powerpc/pseries/vas: VAS/NXGZIP support with LPM

[Haren Myneni]

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 code gets suspend notifier
which closes all active windows and sets VAS_WIN_MIGRATE_CLOSE as
window status. Whereas receives resume notifier after migration
to reopen all windows which has VAS_WIN_MIGRATE_CLOSE status.

These patches depend on VAS/DLPAR support patch series
(https://lists.ozlabs.org/pipermail/linuxppc-dev/2021-December/238331.html)
Also the suspend/resume notifier code is added in a separate patch
and will be posted later with the actual patches.

Haren Myneni (3):
  powerpc/pseries/vas: Modify reconfig open/close functions for
    migration
  powerpc/pseries/vas: Add VAS suspend/resume notifier
  powerpc/pseries/vas: Use migration_in_progress to disable DLPAR

 arch/powerpc/include/asm/vas.h       |   2 +
 arch/powerpc/platforms/pseries/vas.c | 176 ++++++++++++++++++++++++---
 2 files changed, 162 insertions(+), 16 deletions(-)

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2.27.0