Julien Grall writes ("[PATCH for-4.15] xen/vgic: Implement write to ISPENDR in
vGICv{2, 3}"):
> From: Julien Grall <jgr...@amazon.com>
>
> Currently, Xen will send a data abort to a guest trying to write to the
> ISPENDR.
>
> Unfortunately, recent version of Linux (at least 5.9+) will start
> writing to the register if the interrupt needs to be re-triggered
> (see the callback irq_retrigger). This can happen when a driver (such as
> the xgbe network driver on AMD Seattle) re-enable an interrupt:
Release-Acked-by: Ian Jackson <i...@xenproject.org>
