[PATCH] KVM: PPC: Book3S: Add support for H_IPOLL and H_XIRR_X in XICS emulation

[Scott Wood]

On 05/29/2013 06:57:32 PM, Benjamin Herrenschmidt wrote:
> On Wed, 2013-05-29 at 18:38 -0500, Scott Wood wrote:
> 
> > > Yes. I'd like to have them in. Their implementation is actually  
> fairly
> > > trivial and they cannot be emulated by qemu if the rest of the  
> XICS is
> > > in the kernel, so it's a problem.
> >
> > OK.  Does it make more sense for you to take it as Paul suggested,  
> or
> > for Gleb or Marcelo to pick it up directly?
> 
> I'll take it.

Acked-by: Scott Wood <scottwood at freescale.com>

> > Then rm_action should always be 0 for these hcalls, right?  So  
> there's
> > no correctness reason to keep the hcalls in separate switch
> > statements.  You shave off a few cycles checking rm_action, at the  
> cost
> > of needing to change kvmppc_xics_hcall() if a real-mode version of
> > these hcalls is ever done.
> 
> No, because rm_action will also be 0 if the hcall was fully done in  
> real
> mode (which can happen, that's our fast path), in which case we do  
> *NOT*
> want to to be re-done in virtual mode.
> 
> That's why we always return whether rm_action is 0 or not when  
> real-mode
> is enabled.

Oh, I misread the code and thought the decision to return was based on  
the return value of kvmppc_xics_rm_complete.  Sorry about that. :-(

-Scott