Re: [PATCH v2 2/6] tools/oxenstored: Bind the DOM_EXC VIRQ in in Event.init()

[Edwin Torok <edvin.torok@xxxxxxxxxx>]

> On 30 Nov 2022, at 16:54, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
> 
> Xenstored always needs to bind the DOM_EXC VIRQ.
> 
> Instead of doing it shortly after the call to Event.init(), do it in the
> init() call itself.  This removes the need for the field to be a mutable
> option.
> 
> It will also simplify a future change to restore both parts from the live
> update record, rather than re-initialising them from scratch.
> 
> Rename the field from virq_port (which could be any VIRQ) to it's proper name.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> ---
> CC: Christian Lindig <christian.lindig@xxxxxxxxxx>
> CC: David Scott <dave@xxxxxxxxxx>
> CC: Edwin Torok <edvin.torok@xxxxxxxxxx>
> CC: Rob Hoes <Rob.Hoes@xxxxxxxxxx>


reviewd in person:

Reviewed-by: Edwin Török <edvin.torok@xxxxxxxxxx>

> 
> v2:
> * New.
> ---
> tools/ocaml/xenstored/event.ml     | 9 ++++++---
> tools/ocaml/xenstored/xenstored.ml | 4 +---
> 2 files changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/tools/ocaml/xenstored/event.ml b/tools/ocaml/xenstored/event.ml
> index ccca90b6fc4f..a3be296374ff 100644
> --- a/tools/ocaml/xenstored/event.ml
> +++ b/tools/ocaml/xenstored/event.ml
> @@ -17,12 +17,15 @@
> (**************** high level binding ****************)
> type t = {
> handle: Xeneventchn.handle;
> - mutable virq_port: Xeneventchn.t option;
> + domexc: Xeneventchn.t;
> }
> 
> -let init () = { handle = Xeneventchn.init (); virq_port = None; }
> +let init () =
> + let handle = Xeneventchn.init () in
> + let domexc = Xeneventchn.bind_dom_exc_virq handle in
> + { handle; domexc }
> +
> let fd eventchn = Xeneventchn.fd eventchn.handle
> -let bind_dom_exc_virq eventchn = eventchn.virq_port <- Some 
> (Xeneventchn.bind_dom_exc_virq eventchn.handle)
> let bind_interdomain eventchn domid port = Xeneventchn.bind_interdomain 
> eventchn.handle domid port
> let unbind eventchn port = Xeneventchn.unbind eventchn.handle port
> let notify eventchn port = Xeneventchn.notify eventchn.handle port
> diff --git a/tools/ocaml/xenstored/xenstored.ml 
> b/tools/ocaml/xenstored/xenstored.ml
> index c5dc7a28d082..55071b49eccb 100644
> --- a/tools/ocaml/xenstored/xenstored.ml
> +++ b/tools/ocaml/xenstored/xenstored.ml
> @@ -397,7 +397,6 @@ let _ =
> if cf.restart && Sys.file_exists Disk.xs_daemon_database then (
> let rwro = DB.from_file store domains cons Disk.xs_daemon_database in
> info "Live reload: database loaded";
> - Event.bind_dom_exc_virq eventchn;
> Process.LiveUpdate.completed ();
> rwro
> ) else (
> @@ -413,7 +412,6 @@ let _ =
> 
> if cf.domain_init then (
> Connections.add_domain cons (Domains.create0 domains);
> - Event.bind_dom_exc_virq eventchn
> );
> rw_sock
> ) in
> @@ -451,7 +449,7 @@ let _ =
> let port = Event.pending eventchn in
> debug "pending port %d" (Xeneventchn.to_int port);
> finally (fun () ->
> - if Some port = eventchn.Event.virq_port then (
> + if port = eventchn.Event.domexc then (
> let (notify, deaddom) = Domains.cleanup domains in
> List.iter (Store.reset_permissions store) deaddom;
> List.iter (Connections.del_domain cons) deaddom;
> -- 
> 2.11.0
>