Re: [PATCH V4 3/4] intel-iommu: convert VTD_PE_GET_FPD_ERR() to be a function

[Jason Wang <jasowang@redhat.com>]

On Thu, Oct 27, 2022 at 9:16 PM Yi Liu <yi.l.liu@intel.com> wrote:
>
> On 2022/10/27 15:50, Jason Wang wrote:
> > We used to have a macro for VTD_PE_GET_FPD_ERR() but it has an
> > internal goto which prevents it from being reused. This patch convert
> > that macro to a dedicated function and let the caller to decide what
> > to do (e.g using goto or not). This makes sure it can be re-used for
> > other function that requires fault reporting.
> >
> > Signed-off-by: Jason Wang <jasowang@redhat.com>
> > ---
> > Changes since V2:
> > - rename vtd_qualify_report_fault() to vtd_report_qualify_fault()
> > ---
> >   hw/i386/intel_iommu.c | 42 ++++++++++++++++++++++++++++--------------
> >   1 file changed, 28 insertions(+), 14 deletions(-)
> >
> > diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
> > index 6abe12a8c5..6c03ecf3cb 100644
> > --- a/hw/i386/intel_iommu.c
> > +++ b/hw/i386/intel_iommu.c
> > @@ -49,17 +49,6 @@
> >   /* pe operations */
> >   #define VTD_PE_GET_TYPE(pe) ((pe)->val[0] & VTD_SM_PASID_ENTRY_PGTT)
> >   #define VTD_PE_GET_LEVEL(pe) (2 + (((pe)->val[0] >> 2) & VTD_SM_PASID_ENTRY_AW))
> > -#define VTD_PE_GET_FPD_ERR(ret_fr, is_fpd_set, s, source_id, addr, is_write) {\
> > -    if (ret_fr) {                                                             \
> > -        ret_fr = -ret_fr;                                                     \
> > -        if (is_fpd_set && vtd_is_qualified_fault(ret_fr)) {                   \
> > -            trace_vtd_fault_disabled();                                       \
> > -        } else {                                                              \
> > -            vtd_report_dmar_fault(s, source_id, addr, ret_fr, is_write);      \
> > -        }                                                                     \
> > -        goto error;                                                           \
> > -    }                                                                         \
> > -}
> >
> >   /*
> >    * PCI bus number (or SID) is not reliable since the device is usaully
> > @@ -1718,6 +1707,19 @@ out:
> >       trace_vtd_pt_enable_fast_path(source_id, success);
> >   }
> >
> > +static void vtd_report_qualify_fault(IntelIOMMUState *s,
> > +                                     int err, bool is_fpd_set,
> > +                                     uint16_t source_id,
> > +                                     hwaddr addr,
> > +                                     bool is_write)
> > +{
> > +    if (is_fpd_set && vtd_is_qualified_fault(err)) {
> > +        trace_vtd_fault_disabled();
> > +    } else {
> > +        vtd_report_dmar_fault(s, source_id, addr, err, is_write);
>
> seems like this will report non-qualified fault. so the naming is not
> most suit. :-) Otherwise, I'm ok with the change.

Right, let me rename it to vtd_report_fault().

Thanks

>
> > +    }
> > +}
> > +
> >   /* Map dev to context-entry then do a paging-structures walk to do a iommu
> >    * translation.
> >    *
> > @@ -1778,7 +1780,11 @@ static bool vtd_do_iommu_translate(VTDAddressSpace *vtd_as, PCIBus *bus,
> >           is_fpd_set = ce.lo & VTD_CONTEXT_ENTRY_FPD;
> >           if (!is_fpd_set && s->root_scalable) {
> >               ret_fr = vtd_ce_get_pasid_fpd(s, &ce, &is_fpd_set);
> > -            VTD_PE_GET_FPD_ERR(ret_fr, is_fpd_set, s, source_id, addr, is_write);
> > +            if (ret_fr) {
> > +                vtd_report_qualify_fault(s, -ret_fr, is_fpd_set,
> > +                                         source_id, addr, is_write);
> > +                goto error;
> > +            }
> >           }
> >       } else {
> >           ret_fr = vtd_dev_to_context_entry(s, bus_num, devfn, &ce);
> > @@ -1786,7 +1792,11 @@ static bool vtd_do_iommu_translate(VTDAddressSpace *vtd_as, PCIBus *bus,
> >           if (!ret_fr && !is_fpd_set && s->root_scalable) {
> >               ret_fr = vtd_ce_get_pasid_fpd(s, &ce, &is_fpd_set);
> >           }
> > -        VTD_PE_GET_FPD_ERR(ret_fr, is_fpd_set, s, source_id, addr, is_write);
> > +        if (ret_fr) {
> > +            vtd_report_qualify_fault(s, -ret_fr, is_fpd_set,
> > +                                     source_id, addr, is_write);
> > +            goto error;
> > +        }
> >           /* Update context-cache */
> >           trace_vtd_iotlb_cc_update(bus_num, devfn, ce.hi, ce.lo,
> >                                     cc_entry->context_cache_gen,
> > @@ -1822,7 +1832,11 @@ static bool vtd_do_iommu_translate(VTDAddressSpace *vtd_as, PCIBus *bus,
> >
> >       ret_fr = vtd_iova_to_slpte(s, &ce, addr, is_write, &slpte, &level,
> >                                  &reads, &writes, s->aw_bits);
> > -    VTD_PE_GET_FPD_ERR(ret_fr, is_fpd_set, s, source_id, addr, is_write);
> > +    if (ret_fr) {
> > +        vtd_report_qualify_fault(s, -ret_fr, is_fpd_set, source_id,
> > +                                 addr, is_write);
> > +        goto error;
> > +    }
> >
> >       page_mask = vtd_slpt_level_page_mask(level);
> >       access_flags = IOMMU_ACCESS_FLAG(reads, writes);
>
> --
> Regards,
> Yi Liu
>