Re: [PATCH v11 3/3] xen/arm64: io: Handle data abort due to cache maintenance instructions

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Thu, 17 Mar 2022, Ayan Kumar Halder wrote:
> When the data abort is caused due to cache maintenance for an address,
> there are three scenarios:-
> 
> 1. Address belonging to a non emulated region - For this, Xen should
> set the corresponding bit in the translation table entry to valid and
> return to the guest to retry the instruction. This can happen sometimes
> as Xen need to set the translation table entry to invalid. (for eg
> 'Break-Before-Make' sequence). Xen returns to the guest to retry the
> instruction.
> 
> 2. Address belongs to an emulated region - Xen should ignore the
> instruction (ie increment the PC) and return to the guest.
> 
> 3. Address is invalid - Xen should forward the data abort to the guest.
> 
> Signed-off-by: Ayan Kumar Halder <ayankuma@xxxxxxxxxx>

Tested-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>