Re: [Xen-devel] [PATCH v10 2/3] x86/mem_sharing: reset a fork

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Wed, Feb 26, 2020 at 08:28:31AM -0700, Tamas K Lengyel wrote:
> > You also need to reset the contents of the special pages, the
> > vcpu_info pages and the shared_info page in order to match the state
> > the VM was in when forking.
> 
> Ack.
> 
> >
> > PV timers should also be reset to parent's state AFAICT, or else you
> > will get spurious timer interrupts.
> 
> Could you point me to the right direction here for where the timers
> are located in the codebase?

The code paths start at VCPUOP_set_periodic_timer,
VCPUOP_stop_periodic_timer, VCPUOP_set_singleshot_timer and
VCPUOP_stop_singleshot_timer. AFAICT it's mostly a matter of copying
the state and staring the timer if it was already active on the
parent.

Thanks, Roger.

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