Re: [Xen-devel] [PATCH v3 5/7] vpci: fix execution of long running operations

[Julien Grall <julien.grall@xxxxxxx>]

Hi,

Sorry to jump in the conversation late.

On 11/8/18 11:29 AM, Roger Pau Monné wrote:
> > Why would that be? The do_softirq() invocation sits on the exit-
> > to-guest path, explicitly avoiding any such nesting unless there
> > was a do_softirq() invocation somewhere in a softirq handler.
> It sits on an exit-to-guest path, but the following chunk:
>
> raise_softirq(SCHEDULE_SOFTIRQ);
> do_softirq();
>
> Would prevent the path from ever reaching the exit-to-guest and
> nesting on itself, unless the vCPU is marked as blocked, which
> prevents it from being scheduled thus avoiding this recursion.
I can't see how the recursion could happen on Arm. So is it an x86 issue?

Cheers,

--
Julien Grall

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