Sometimes, certain parts are not being skipped in
vhost_vdpa_listener_region_del, but they are skipped in
vhost_vdpa_listener_region_add, or vice versa.  The vhost-vdpa code
expects all parts to maintain their properties, so we're adding a trace
to help with debugging when any part is skipped.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 hw/virtio/trace-events | 1 +
 hw/virtio/vhost-vdpa.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events
index 77905d1994..fa2fb6b6d1 100644
--- a/hw/virtio/trace-events
+++ b/hw/virtio/trace-events
@@ -30,6 +30,7 @@ vhost_user_write(uint32_t req, uint32_t flags) "req:%d flags:0x%"PRIx32""
 vhost_user_create_notifier(int idx, void *n) "idx:%d n:%p"
 
 # vhost-vdpa.c
+vhost_vdpa_skipped_memory_section(int is_ram, int is_iommu, int is_protected, int is_ram_device, uint64_t first, uint64_t last, int page_mask) "is_ram=%d, is_iommu=%d, is_protected=%d, is_ram_device=%d iova_min=0x%"PRIx64" iova_last=0x%"PRIx64" page_mask=0x%x"
 vhost_vdpa_dma_map(void *vdpa, int fd, uint32_t msg_type, uint32_t asid, uint64_t iova, uint64_t size, uint64_t uaddr, uint8_t perm, uint8_t type) "vdpa_shared:%p fd: %d msg_type: %"PRIu32" asid: %"PRIu32" iova: 0x%"PRIx64" size: 0x%"PRIx64" uaddr: 0x%"PRIx64" perm: 0x%"PRIx8" type: %"PRIu8
 vhost_vdpa_dma_unmap(void *vdpa, int fd, uint32_t msg_type, uint32_t asid, uint64_t iova, uint64_t size, uint8_t type) "vdpa_shared:%p fd: %d msg_type: %"PRIu32" asid: %"PRIu32" iova: 0x%"PRIx64" size: 0x%"PRIx64" type: %"PRIu8
 vhost_vdpa_listener_begin_batch(void *v, int fd, uint32_t msg_type, uint8_t type)  "vdpa_shared:%p fd: %d msg_type: %"PRIu32" type: %"PRIu8
diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index 2b9e5c3d4d..76d300be29 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -55,6 +55,9 @@ static bool vhost_vdpa_listener_skipped_section(MemoryRegionSection *section,
     bool is_ram_device = memory_region_is_ram_device(section->mr);
 
     if ((!is_ram && !is_iommu) || is_protected || is_ram_device) {
+        trace_vhost_vdpa_skipped_memory_section(is_ram, is_iommu, is_protected,
+                                                is_ram_device, iova_min,
+                                                iova_max, page_mask);
         return true;
     }
 
-- 
2.43.0