RE: [PATCH V4 17/24] xen/ioreq: Introduce domain_has_ioreq_server()

[Paul Durrant <xadimgnik@xxxxxxxxx>]

> -----Original Message-----
> From: Xen-devel <xen-devel-bounces@xxxxxxxxxxxxxxxxxxxx> On Behalf Of 
> Oleksandr Tyshchenko
> Sent: 12 January 2021 21:52
> To: xen-devel@xxxxxxxxxxxxxxxxxxxx
> Cc: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>; Stefano Stabellini 
> <sstabellini@xxxxxxxxxx>;
> Julien Grall <julien@xxxxxxx>; Volodymyr Babchuk 
> <Volodymyr_Babchuk@xxxxxxxx>; Paul Durrant
> <paul@xxxxxxx>; Julien Grall <julien.grall@xxxxxxx>
> Subject: [PATCH V4 17/24] xen/ioreq: Introduce domain_has_ioreq_server()
> 
> From: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
> 
> This patch introduces a helper the main purpose of which is to check
> if a domain is using IOREQ server(s).
> 
> On Arm the current benefit is to avoid calling vcpu_ioreq_handle_completion()
> (which implies iterating over all possible IOREQ servers anyway)
> on every return in leave_hypervisor_to_guest() if there is no active
> servers for the particular domain.
> Also this helper will be used by one of the subsequent patches on Arm.
> 
> Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
> CC: Julien Grall <julien.grall@xxxxxxx>
> [On Arm only]
> Tested-by: Wei Chen <Wei.Chen@xxxxxxx>
> 

Reviewed-by: Paul Durrant <paul@xxxxxxx>