Re: [Qemu-devel] [PATCH 4/7] qemu_flush_work for remote vcpu execution

[Avi Kivity]

On 11/30/2009 01:44 PM, Glauber Costa wrote:
> > I really dislike this.  In general vcpu ioctls are used as components of
> > some work to be done, for example RMW of some state.  In this case it is
> > meaningless to execute the ioctls remotely, you need to execute the entire
> > RMW remotely instead.
> >
> >      
> Why? The "M" part of RMW is executed in shared memory.
> Only the R and W parts have any restrictions on where to be executed.
>
>    

If the guest continues to run during the RMW, you will get inconsistent 
results.

This may be prevented by qemu_mutex, but I'd rather not rely on it.

Also, I'd like remote operations to be visible.

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