Re: [Xen-devel] [PATCH v2] x86/xen: Return from panic notifier

[Jürgen Groß <jgross@xxxxxxxx>]

On 03.10.19 20:12, Boris Ostrovsky wrote:
> Currently execution of panic() continues until Xen's panic notifier
> (xen_panic_event()) is called at which point we make a hypercall that
> never returns.
>
> This means that any notifier that is supposed to be called later as
> well as significant part of panic() code (such as pstore writes from
> kmsg_dump()) is never executed.
>
> There is no reason for xen_panic_event() to be this last point in
> execution since panic()'s emergency_restart() will call into
> xen_emergency_restart() from where we can perform our hypercall.
>
> Nevertheless, we will provide xen_legacy_crash boot option that will
> preserve original behavior during crash. This option could be used,
> for example, if running kernel dumper (which happens after panic
> notifiers) is undesirable.
>
> Reported-by: James Dingwall <james@xxxxxxxxxxxxxx>
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>


Juergen

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