[PULL 07/17] vfio/common: Consolidate skip/invalid section into helper

[Alex Williamson <alex.williamson@redhat.com>]

From: Joao Martins <joao.m.martins@oracle.com>

The checks are replicated against region_add and region_del
and will be soon added in another memory listener dedicated
for dirty tracking.

Move these into a new helper for avoid duplication.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Avihai Horon <avihaih@nvidia.com>
Link: https://lore.kernel.org/r/20230307125450.62409-8-joao.m.martins@oracle.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---
 hw/vfio/common.c |   55 +++++++++++++++++++++++-------------------------------
 1 file changed, 23 insertions(+), 32 deletions(-)

diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 1cb62efa9743..d38b7c1969b9 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -933,23 +933,15 @@ static bool vfio_known_safe_misalignment(MemoryRegionSection *section)
     return true;
 }
 
-static void vfio_listener_region_add(MemoryListener *listener,
-                                     MemoryRegionSection *section)
+static bool vfio_listener_valid_section(MemoryRegionSection *section,
+                                        const char *name)
 {
-    VFIOContainer *container = container_of(listener, VFIOContainer, listener);
-    hwaddr iova, end;
-    Int128 llend, llsize;
-    void *vaddr;
-    int ret;
-    VFIOHostDMAWindow *hostwin;
-    Error *err = NULL;
-
     if (vfio_listener_skipped_section(section)) {
-        trace_vfio_listener_region_skip("region_add",
+        trace_vfio_listener_region_skip(name,
                 section->offset_within_address_space,
                 section->offset_within_address_space +
                 int128_get64(int128_sub(section->size, int128_one())));
-        return;
+        return false;
     }
 
     if (unlikely((section->offset_within_address_space &
@@ -964,6 +956,24 @@ static void vfio_listener_region_add(MemoryListener *listener,
                          section->offset_within_region,
                          qemu_real_host_page_size());
         }
+        return false;
+    }
+
+    return true;
+}
+
+static void vfio_listener_region_add(MemoryListener *listener,
+                                     MemoryRegionSection *section)
+{
+    VFIOContainer *container = container_of(listener, VFIOContainer, listener);
+    hwaddr iova, end;
+    Int128 llend, llsize;
+    void *vaddr;
+    int ret;
+    VFIOHostDMAWindow *hostwin;
+    Error *err = NULL;
+
+    if (!vfio_listener_valid_section(section, "region_add")) {
         return;
     }
 
@@ -1182,26 +1192,7 @@ static void vfio_listener_region_del(MemoryListener *listener,
     int ret;
     bool try_unmap = true;
 
-    if (vfio_listener_skipped_section(section)) {
-        trace_vfio_listener_region_skip("region_del",
-                section->offset_within_address_space,
-                section->offset_within_address_space +
-                int128_get64(int128_sub(section->size, int128_one())));
-        return;
-    }
-
-    if (unlikely((section->offset_within_address_space &
-                  ~qemu_real_host_page_mask()) !=
-                 (section->offset_within_region & ~qemu_real_host_page_mask()))) {
-        if (!vfio_known_safe_misalignment(section)) {
-            error_report("%s received unaligned region %s iova=0x%"PRIx64
-                         " offset_within_region=0x%"PRIx64
-                         " qemu_real_host_page_size=0x%"PRIxPTR,
-                         __func__, memory_region_name(section->mr),
-                         section->offset_within_address_space,
-                         section->offset_within_region,
-                         qemu_real_host_page_size());
-        }
+    if (!vfio_listener_valid_section(section, "region_del")) {
         return;
     }