Re: [PATCH V2 3/5] memory: introduce memory_region_unmap_iommu_notifier_range()

[Jason Wang <jasowang@redhat.com>]

On Wed, Mar 8, 2023 at 9:02 AM Michael S. Tsirkin <mst@redhat.com> wrote:
>
> On Thu, Feb 23, 2023 at 02:59:22PM +0800, Jason Wang wrote:
> > This patch introduces a new helper to unmap the range of a specific
> > IOMMU notifier.
> >
> > Signed-off-by: Jason Wang <jasowang@redhat.com>
> > ---
> >  include/exec/memory.h | 10 ++++++++++
> >  softmmu/memory.c      | 13 +++++++++++++
> >  2 files changed, 23 insertions(+)
> >
> > diff --git a/include/exec/memory.h b/include/exec/memory.h
> > index 2e602a2fad..6fa0b071f0 100644
> > --- a/include/exec/memory.h
> > +++ b/include/exec/memory.h
> > @@ -1731,6 +1731,16 @@ void memory_region_notify_iommu(IOMMUMemoryRegion *iommu_mr,
> >  void memory_region_notify_iommu_one(IOMMUNotifier *notifier,
> >                                      IOMMUTLBEvent *event);
> >
> > +/**
> > + * memory_region_unmap_iommu_notifier_range: notify a unmap for an IOMMU
> > + *                                           translation that covers the
> > + *                                           range of a notifier
> > + *
> > + * @notifier: the notifier to be notified
> > + */
> > +void memory_region_unmap_iommu_notifier_range(IOMMUNotifier *n);
> > +
> > +
> >  /**
> >   * memory_region_register_iommu_notifier: register a notifier for changes to
> >   * IOMMU translation entries.
>
> This causes doc warnings:
>
> /scm/qemu/docs/../include/exec/memory.h:1741: warning: Function parameter or member 'n' not described in 'memory_region_unmap_iommu_notifier_range'
> /scm/qemu/docs/../include/exec/memory.h:1741: warning: Excess function parameter 'notifier' description in 'memory_region_unmap_iommu_notifier_range'
>
>
> please fix.

Will do.

Thanks

>
>
> > diff --git a/softmmu/memory.c b/softmmu/memory.c
> > index 9d64efca26..ba43b4474e 100644
> > --- a/softmmu/memory.c
> > +++ b/softmmu/memory.c
> > @@ -1996,6 +1996,19 @@ void memory_region_notify_iommu_one(IOMMUNotifier *notifier,
> >      }
> >  }
> >
> > +void memory_region_unmap_iommu_notifier_range(IOMMUNotifier *n)
> > +{
> > +    IOMMUTLBEvent event;
> > +
> > +    event.type = IOMMU_NOTIFIER_UNMAP;
> > +    event.entry.target_as = &address_space_memory;
> > +    event.entry.iova = n->start;
> > +    event.entry.perm = IOMMU_NONE;
> > +    event.entry.addr_mask = n->end - n->start;
> > +
> > +    memory_region_notify_iommu_one(n, &event);
> > +}
> > +
> >  void memory_region_notify_iommu(IOMMUMemoryRegion *iommu_mr,
> >                                  int iommu_idx,
> >                                  IOMMUTLBEvent event)
> > --
> > 2.25.1
>