Re: KVM and RT

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Gregory Haskins wrote:
> Hi Team,
>   I don't know if anyone here also subscribes to linux-rt-users, but it
> seems as though Ingo et. al. rejected my modifications which ran the
> smp_call() in a thread (VFCIPI).  

It's not surprising.  650 lines including a custom memory allocator is
excessive.

> So FYI: KVM is still broken on RT and
> needs to be addressed.
>
> In a nutshell, kvm_lock cannot be used as it us today.  It either needs
> to be a raw_spinlock_t, or the locking needs to be done differently.
> The code currently blows up when you shut down a VM running on top of
> PREEMPT_RT.  Just thought you might want to know.
>   

What about hoisting the lock outside the IPI as I suggested earlier?

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


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