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Re: [Qemu-devel] [RFC v2 05/38] plugin: add user-facing API

From: Emilio G. Cota
Subject: Re: [Qemu-devel] [RFC v2 05/38] plugin: add user-facing API
Date: Fri, 14 Dec 2018 13:23:55 -0500
User-agent: Mutt/1.9.4 (2018-02-28)

On Fri, Dec 14, 2018 at 17:59:20 +0000, Aaron Lindsay wrote:
> On Dec 14 12:08, Emilio G. Cota wrote:
> > The idea is that a plugin can "reset" itself, so that (1) all
> > its CBs are cleared and (2) the plugin can register new callbacks.
> > This would all happen in an atomic context (no vCPU running), so
> > that the plugin would miss no CPU events.
> The implication being that there would not be the same possibility of
> other callbacks being called between when qemu_plugin_reset and the
> qemu_plugin_reset_cb_t callback are called as there is at plugin
> un-installation time?

The callback is needed for the same reason -- we can only guarantee
that there will be no callbacks once the current RCU read critical section

> > How does this sound?
> I think what you describe is exactly what I'm interested in.

Nice. I'll work on this for v3.



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