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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 12:50:22 -0500
User-agent: Mutt/1.9.4 (2018-02-28)

On Fri, Dec 14, 2018 at 12:08:22 -0500, Emilio G. Cota wrote:
> On Fri, Dec 14, 2018 at 15:57:32 +0000, Aaron Lindsay wrote:
> > I added a function to the user-facing plugin API in my own version of
> > Pavel's plugin patchset to clear all existing plugin instrumentation,
> I think the following API call would do what you need:
>   typedef int (*qemu_plugin_reset_cb_t)(qemu_plugin_id_t id);
>   void qemu_plugin_reset(qemu_plugin_id_t id, qemu_plugin_reset_cb_t cb);
> (or maybe qemu_plugin_reinstall?)

An alternative is to track the TBs that a plugin has inserted
instrumentation into, and only flush those. This would require
us to do an additional hash table insert when adding a
direct callback, but it allow us to avoid exporting tb_flush indirectly
to plugins, which could be abused by malicious plugins to perform
a DoS attack.

I'll look into this.


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