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0620837490
Introduce an rw-semaphore to serialize migration to device if it's likely that migration races with another device migration of the same CPU address space range. This is a temporary fix to attempt to mitigate a livelock that might happen if many devices try to migrate a range at the same time, and it affects only devices using the xe driver. A longer term fix is probably improvements in the core mm migration layer. Suggested-by: Matthew Brost <matthew.brost@intel.com> Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Reviewed-by: Matthew Brost <matthew.brost@intel.com> Link: https://patch.msgid.link/20251219113320.183860-25-thomas.hellstrom@linux.intel.com