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When an XIVE context is pulled while it has an active, unacknowledged group interrupt, XIVE will check to see if a context on another thread can handle the interrupt and, if so, notify that context. If there are no contexts that can handle the interrupt, then the interrupt is added to a backlog and XIVE will attempt to escalate the interrupt, if configured to do so, allowing the higher privileged handler to activate a context that can handle the original interrupt. Signed-off-by: Glenn Miles <milesg@linux.ibm.com> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Reviewed-by: Michael Kowal <kowal@linux.ibm.com> Tested-by: Gautam Menghani <gautam@linux.ibm.com> Link: https://lore.kernel.org/qemu-devel/20250512031100.439842-23-npiggin@gmail.com Signed-off-by: Cédric Le Goater <clg@redhat.com>