Re: [Qemu-devel] [RFC PATCH v2 11/13] spapr_pci_vfio: Enable DDW

[David Gibson]

On Tue, Aug 26, 2014 at 06:16:51PM +1000, Alexey Kardashevskiy wrote:
> On 08/26/2014 05:19 PM, David Gibson wrote:
> > On Fri, Aug 15, 2014 at 08:12:33PM +1000, Alexey Kardashevskiy wrote:
> >> This implements DDW for VFIO. Host kernel support is required for this.
> >>
> >> Signed-off-by: Alexey Kardashevskiy <address@hidden>
> >> ---
> >> Changes:
> >> v2:
> >> * remove()/reset() callbacks use spapr_pci's ones
> >> ---
> >>  hw/ppc/spapr_pci_vfio.c | 86 
> >> +++++++++++++++++++++++++++++++++++++++++++++++++
> >>  1 file changed, 86 insertions(+)
> >>
> >> diff --git a/hw/ppc/spapr_pci_vfio.c b/hw/ppc/spapr_pci_vfio.c
> >> index 11b4272..79df716 100644
> >> --- a/hw/ppc/spapr_pci_vfio.c
> >> +++ b/hw/ppc/spapr_pci_vfio.c
> >> @@ -71,6 +71,88 @@ static void spapr_phb_vfio_finish_realize(sPAPRPHBState 
> >> *sphb, Error **errp)
> >>                                  spapr_tce_get_iommu(tcet));
> >>  
> >>      object_unref(OBJECT(tcet));
> >> +
> >> +    if (sphb->ddw_enabled) {
> >> +        sphb->ddw_enabled = !!(info.flags & 
> >> VFIO_IOMMU_SPAPR_TCE_FLAG_DDW);
> > 
> > This overrides an explicit ddw= set by the user, which is a bit
> > counter-intuitive.
> 
> 
> For the user it is rather "try ddw when available" than "do ddw". This was
> suggested by Alex Graf or I misunderstood his suggestion :)

Uh.. never mind.  I misread this, not spotting the "if" :).

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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