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


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:


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?


Julien Grall

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