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-rw-r--r--doc/opal-api/opal-int-eoi-124.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/doc/opal-api/opal-int-eoi-124.txt b/doc/opal-api/opal-int-eoi-124.txt
index 9405018..17e4eff 100644
--- a/doc/opal-api/opal-int-eoi-124.txt
+++ b/doc/opal-api/opal-int-eoi-124.txt
@@ -7,6 +7,11 @@ Not yet implemented.
Modelled on the H_EOI PAPR call.
+This can return a positive value, which means more interrupts
+are queued for that CPU/priority and must be fetched as the XIVE is not
+guaranteed to assert the CPU external interrupt line again until the
+pending queue for the current priority has been emptied.
+
For P9 and above systems where host doesn't know about interrupt controller.
An OS can instead make OPAL calls for XICS emulation.