Re: [PATCH for-4.15] xen/vgic: Implement write to ISPENDR in vGICv{2, 3}

[Ian Jackson <iwj@xxxxxxxxxxxxxx>]

Julien Grall writes ("[PATCH for-4.15] xen/vgic: Implement write to ISPENDR in 
vGICv{2, 3}"):
> From: Julien Grall <jgrall@xxxxxxxxxx>
> 
> 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 <iwj@xxxxxxxxxxxxxx>