Re: [Xen-devel] xenbus stress testing

[Olaf Hering <olaf@xxxxxxxxx>]

On Fri, Feb 18, Paul Durrant wrote:

> How do you propose to lock against another VM updating a counter in shared 
> memory?

I thought xenstore uses the same ringbuffer as defined by
DEFINE_RING_TYPES(). But reading the code in
include/xen/interface/io/xs_wire.h shows it has its own logic.

And reading further in xenpaging code, which I had in mind while I wrote
the mail, shows there is a separate spinlock.

I can imagine that even if a lock exists, a VM crashing while holding
the lock can stall all other VMs. So its probably not the best idea.

Olaf

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