Re: [Qemu-devel] global_mutex and multithread.

[Frederic Konrad]

On 15/01/2015 13:56, Paolo Bonzini wrote:
> On 15/01/2015 13:51, Frederic Konrad wrote:
> > Thanks for the reply.
> >
> > As I understand the idea of Jan is to unlock the global_mutex during tcg
> > execution.
> > Is that right?
> > So that means it's currently not the case and we won't be able to run
> > two TCG
> > threads at the same time?
> Yes.
>
> > About the RCU, is there a lot of device which change the memory map?
> All PCI devices (when you program their BARs), but apart from that not
> much.  As a first approximation, the patches on github which use
> CPU_INTERRUPT_TLBFLUSH should work even for multiple TCG threads.

Ok that makes sense. Thanks!

Fred

PS: Any idea why listserver is dropped from listserver.greensocs.com?
> I'll clean them up a bit further so that CPU_INTERRUPT_TLBFLUSH is used
> for CPUs other than the running one; the running CPU instead uses
> tlb_flush directly.
>
> If anyone can sum up how cpu_resume_from_signal works, that would also
> be helpful.
>
> Paolo