Re: [kvm-devel] KVM: kvm_vcpu_block task state race

[Marcelo T. <mto...@re...>]

On Fri, May 09, 2008 at 10:40:47AM +0300, Avi Kivity wrote:

> >Unfortunately it can't use wait_event_interruptible() due to
> >vcpu_put/vcpu_load.
> >
> >  
> 
> schedule() will call vcpu_put()/vcpu_load() for us through preempt 
> notifiers.  I feel a little uneasy about it, but no concreate reason why 
> not to rely on it.

The preempt notifiers hook call kvm_arch_vcpu_load / kvm_arch_vcpu_put,
which won't unlock the vcpu mutex, right?

I worry about a possible deadlock where some other operation that
requires the vcpu mutex happens but the vcpu thread itself is in hlt.