[Qemu-devel] Re: kvm crashes with spice while loading qxl

[Avi Kivity]

On 03/08/2011 11:28 AM, Paolo Bonzini wrote:
> On 03/08/2011 10:17 AM, Avi Kivity wrote:
> > > Memory map can be protected by a read-write lock initially, so that 
> > > vcpu
> > > thread holds it for read. Later can be converted to URCU.
> >
> > rwlock is insufficient, need a way to force the vcpu off so a writer can
> > actually do something.
> >
> > So we need some kind of priority rwlock where a reader lets the lock
> > know how it can force it off in case a writer comes along.
>
> If the reader is the VCPU thread, the VCPU thread can always be 
> bounced via qemu_cpu_kick.

Right, I just want the lock to do it automatically instead of sprinkling 
it everywhere we take a write lock.

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