Re: [PATCH v3 9/9] powerpc/pseries: HVPIPE changes to support migration
From: Tyrel Datwyler <tyreld@linux.ibm.com>
Date: 2025-08-29 19:59:37
On 8/28/25 4:08 PM, Haren Myneni wrote:
The hypervisor assigns one pipe per partition for all sources and assigns new pipe after migration. Also the partition ID that is used by source as its target ID may be changed after the migration. So disable hvpipe during SUSPEND event with ‘hvpipe enable’ system parameter value = 0 and enable it after migration during RESUME event with hvpipe enable’ system parameter value = 1. The user space calls such as ioctl()/ read() / write() / poll() returns -ENXIO between SUSPEND and RESUME events. The user space process can close FD and reestablish connection with new FD after migration if needed (Example: source IDs are changed). Signed-off-by: Haren Myneni <haren@linux.ibm.com> Reviewed-by: Mahesh Salgaonkar <mahesh@linux.ibm.com> Tested-by: Shashank MS <redacted> ---
Reviewed-by: Tyrel Datwyler <tyreld@linux.ibm.com>