Re: [PATCH v3 0/2] powerpc kvm: fix deadlock scene

On Fri, Nov 08, 2013 at 03:29:52PM +0800, Liu Ping Fan wrote:

v2->v3:
  introduce kvmppc_hv_unlock_hpte() to pair with kvmppc_hv_find_lock_hpte()
  and hide the preemption detail inside this pair from the callers

Actually, I preferred v2.  This version seems a bit over-engineered.

Making a kvmppc_hv_unlock_hpte() is not such a bad idea, though I
would make it identical to the existing unlock_hpte() from
book3s_hv_rm_mmu.c, just in a header.  I'm really not convinced about
putting the preempt_disable/enable inside the lock/unlock functions,
with the consequent need to pass in a 'vmode' parameter, given that
there is just one caller that needs to do the preempt_disable/enable.

Regards,
Paul.