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Re: [Xen-devel] [PATCH 4/6] xen/hypercall: Cope with -ERESTART on more hypercall paths

On 05.12.2019 23:30, Andrew Cooper wrote:
> These hypercalls each use continue_hypercall_on_cpu(), whose API is about to
> switch to use -ERESTART.  Update the soon-to-be affected paths to cope,
> folding existing contination logic where applicable.
> In addition:
>  * For platform op and sysctl, insert a cpu_relax() into what is otherwise a
>    tight spinlock loop, and make the continuation logic common at the
>    epilogue.

Is this really needed with a hypercall_preempt_check() invocation
already in the bodies of these loops?


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