Re: [Qemu-devel] [PATCH v2] spapr_vio/spapr_iommu: Move VIO bypass where it belongs

[David Gibson]

On Wed, Jan 28, 2015 at 07:49:48PM +1100, Alexey Kardashevskiy wrote:
> On 01/28/2015 08:21 AM, Alexey Kardashevskiy wrote:
> > On 01/27/2015 05:13 PM, Alexey Kardashevskiy wrote:
[snip]
> >> diff --git a/include/hw/ppc/spapr_vio.h b/include/hw/ppc/spapr_vio.h
> >> index 46edc2a..6ad55d1 100644
> >> --- a/include/hw/ppc/spapr_vio.h
> >> +++ b/include/hw/ppc/spapr_vio.h
> >> @@ -64,6 +64,8 @@ struct VIOsPAPRDevice {
> >>      target_ulong signal_state;
> >>      VIOsPAPR_CRQ crq;
> >>      AddressSpace as;
> >> +    MemoryRegion mrroot;
> >> +    MemoryRegion mrbypass;
> >>      sPAPRTCETable *tcet;
> >>  };
> >>  
> >>
> > 
> > 
> 
> 
> I believe doing something like this is way too disguising because of
> tobj->parent?

It's kinda ugly, but it's the best way I can think of.

So, I think this is a reasonable approach, but it does need a comment
saying why the hack is necessary.

> 
> 
> 
> --- a/hw/ppc/spapr_iommu.c
> +++ b/hw/ppc/spapr_iommu.c
> @@ -25,6 +25,7 @@
>  #include "trace.h"
> 
>  #include "hw/ppc/spapr.h"
> +#include "hw/ppc/spapr_vio.h"
> 
>  #include <libfdt.h>
> 
> @@ -88,10 +89,26 @@ static IOMMUTLBEntry
> spapr_tce_translate_iommu(MemoryRegion *iommu, hwaddr addr,
>      return ret;
>  }
> 
> +static int spapr_tce_table_post_load(void *opaque, int version_id)
> +{
> +    sPAPRTCETable *tcet = SPAPR_TCE_TABLE(opaque);
> +    Object *tobj = OBJECT(tcet);
> +    Object *vobj = object_dynamic_cast(tobj->parent, TYPE_VIO_SPAPR_DEVICE);
> +
> +    if (!vobj) {
> +        return 0;
> +    }
> +
> +    spapr_vio_set_bypass((VIOsPAPRDevice *) vobj, tcet->bypass);
> +
> +    return 0;
> +}
> +
>  static const VMStateDescription vmstate_spapr_tce_table = {
>      .name = "spapr_iommu",
>      .version_id = 2,
>      .minimum_version_id = 2,
> +    .post_load = spapr_tce_table_post_load,
>      .fields      = (VMStateField []) {
>          /* Sanity check */
>          VMSTATE_UINT32_EQUAL(liobn, sPAPRTCETable),
> 
> 
> 

-- 
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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