Register a MAP notifier to propage MSI stage 1 bindings to
the host. When the notifier gets called, we pass the guest
stage 1 MSI binding to the host. The host can then build
a S2 binding whose entry is the guest MSI doorbell GPA.
Signed-off-by: Eric Auger <eric.au...@redhat.com>
---
hw/vfio/common.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 49fcbbbc8c..412041593e 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -407,6 +407,26 @@ static void vfio_iommu_unmap_notify(IOMMUNotifier *n,
IOMMUTLBEntry *iotlb)
}
}
+static void vfio_iommu_msi_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
+{
+ VFIOGuestIOMMU *giommu = container_of(n, VFIOGuestIOMMU, n);
+ VFIOContainer *container = giommu->container;
+ struct vfio_iommu_type1_bind_guest_msi ustruct;
+ int ret;
+
+ ustruct.argsz = sizeof(struct vfio_iommu_type1_bind_guest_msi);
+ ustruct.flags = 0;
+ ustruct.binding.iova = iotlb->iova;
+ ustruct.binding.gpa = iotlb->translated_addr;
+ ustruct.binding.granule = ctz64(~iotlb->addr_mask);
+
+ ret = ioctl(container->fd, VFIO_IOMMU_BIND_MSI , &ustruct);
+ if (ret) {
+ error_report("%s: failed to pass MSI binding (%d)",
+ __func__, ret);
+ }
+}
+
static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
{
VFIOGuestIOMMU *giommu = container_of(n, VFIOGuestIOMMU, n);
@@ -742,6 +762,15 @@ static void vfio_listener_region_add(MemoryListener
*listener,
iommu_idx);
QLIST_INSERT_HEAD(&container->giommu_list, giommu, giommu_next);
memory_region_register_iommu_notifier(section->mr, &giommu->n);
+
+ giommu = vfio_alloc_guest_iommu(container, iommu_mr, offset);
+ iommu_iotlb_notifier_init(&giommu->n, vfio_iommu_msi_map_notify,
+ IOMMU_NOTIFIER_MAP,
+ section->offset_within_region,
+ int128_get64(llend),
+ iommu_idx);
+ QLIST_INSERT_HEAD(&container->giommu_list, giommu, giommu_next);
+ memory_region_register_iommu_notifier(section->mr, &giommu->n);
} else {
/* MAP/UNMAP IOTLB notifier */
giommu = vfio_alloc_guest_iommu(container, iommu_mr, offset);
--
2.17.1
