[RFC,v3,07/14] memory: add section range info for IOMMU notifier

In this patch, IOMMUNotifier.{start|end} are introduced to store section
information for a specific notifier. When notification occurs, we not
only check the notification type (MAP|UNMAP), but also check whether the
notified iova is in the range of specific IOMMU notifier, and skip those
notifiers if not in the listened range.

When removing an region, we need to make sure we removed the correct
VFIOGuestIOMMU by checking the IOMMUNotifier.start address as well.

Suggested-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 hw/vfio/common.c      | 7 ++++++-
 include/exec/memory.h | 3 +++
 memory.c              | 4 +++-
 3 files changed, 12 insertions(+), 2 deletions(-)

On 2017年01月13日 11:06, Peter Xu wrote:
> In this patch, IOMMUNotifier.{start|end} are introduced to store section
> information for a specific notifier. When notification occurs, we not
> only check the notification type (MAP|UNMAP), but also check whether the
> notified iova is in the range of specific IOMMU notifier, and skip those
> notifiers if not in the listened range.
>
> When removing an region, we need to make sure we removed the correct
> VFIOGuestIOMMU by checking the IOMMUNotifier.start address as well.
>
> Suggested-by: David Gibson <david@gibson.dropbear.id.au>
> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
> Acked-by: Paolo Bonzini <pbonzini@redhat.com>
> Signed-off-by: Peter Xu <peterx@redhat.com>
> ---
>   hw/vfio/common.c      | 7 ++++++-
>   include/exec/memory.h | 3 +++
>   memory.c              | 4 +++-
>   3 files changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/hw/vfio/common.c b/hw/vfio/common.c
> index 801578b..6f648da 100644
> --- a/hw/vfio/common.c
> +++ b/hw/vfio/common.c
> @@ -455,6 +455,10 @@ static void vfio_listener_region_add(MemoryListener *listener,
>           giommu->container = container;
>           giommu->n.notify = vfio_iommu_map_notify;
>           giommu->n.notifier_flags = IOMMU_NOTIFIER_ALL;
> +        giommu->n.start = section->offset_within_region;
> +        llend = int128_add(int128_make64(giommu->n.start), section->size);
> +        llend = int128_sub(llend, int128_one());
> +        giommu->n.end = int128_get64(llend);
>           QLIST_INSERT_HEAD(&container->giommu_list, giommu, giommu_next);
>   
>           memory_region_register_iommu_notifier(giommu->iommu, &giommu->n);
> @@ -525,7 +529,8 @@ static void vfio_listener_region_del(MemoryListener *listener,
>           VFIOGuestIOMMU *giommu;
>   
>           QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) {
> -            if (giommu->iommu == section->mr) {
> +            if (giommu->iommu == section->mr &&
> +                giommu->n.start == section->offset_within_region) {
>                   memory_region_unregister_iommu_notifier(giommu->iommu,
>                                                           &giommu->n);
>                   QLIST_REMOVE(giommu, giommu_next);
> diff --git a/include/exec/memory.h b/include/exec/memory.h
> index bec9756..7649e74 100644
> --- a/include/exec/memory.h
> +++ b/include/exec/memory.h
> @@ -84,6 +84,9 @@ typedef enum {
>   struct IOMMUNotifier {
>       void (*notify)(struct IOMMUNotifier *notifier, IOMMUTLBEntry *data);
>       IOMMUNotifierFlag notifier_flags;
> +    /* Notify for address space range start <= addr <= end */
> +    hwaddr start;
> +    hwaddr end;
>       QLIST_ENTRY(IOMMUNotifier) node;
>   };
>   typedef struct IOMMUNotifier IOMMUNotifier;
> diff --git a/memory.c b/memory.c
> index 2bfc37f..e88bb54 100644
> --- a/memory.c
> +++ b/memory.c
> @@ -1671,7 +1671,9 @@ void memory_region_notify_iommu(MemoryRegion *mr,
>       }
>   
>       QLIST_FOREACH(iommu_notifier, &mr->iommu_notify, node) {
> -        if (iommu_notifier->notifier_flags & request_flags) {
> +        if (iommu_notifier->notifier_flags & request_flags &&
> +            iommu_notifier->start <= entry.iova &&
> +            iommu_notifier->end >= entry.iova) {
>               iommu_notifier->notify(iommu_notifier, &entry);
>           }
>       }

This seems breaks vhost device IOTLB. How about keep the the behavior 
somehow?

Thanks