Commit bafc90bdc594 ("q35: implement TSEG") uses
memory_region_set_address() for updating the address of mch->tseg_window
but uses memory_region_del_subregion() and
memory_region_add_subregion_overlap() for doing the same on mch-
>tseg_blackhole. The latter seems to be the old, cumbersome
way of changing a memory region's address. So make the code more
comprehensible by modernizing it.

Signed-off-by: Bernhard Beschow <shentey@gmail.com>
---
 hw/pci-host/q35.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/hw/pci-host/q35.c b/hw/pci-host/q35.c
index 40bfe99910..0497194983 100644
--- a/hw/pci-host/q35.c
+++ b/hw/pci-host/q35.c
@@ -404,12 +404,11 @@ static void mch_update_smram(MCHPCIState *mch)
     } else {
         tseg_size = 0;
     }
-    memory_region_del_subregion(mch->system_memory, &mch->tseg_blackhole);
+
     memory_region_set_enabled(&mch->tseg_blackhole, tseg_size);
     memory_region_set_size(&mch->tseg_blackhole, tseg_size);
-    memory_region_add_subregion_overlap(mch->system_memory,
-                                        mch->below_4g_mem_size - tseg_size,
-                                        &mch->tseg_blackhole, 1);
+    memory_region_set_address(&mch->tseg_blackhole,
+                              mch->below_4g_mem_size - tseg_size);
 
     memory_region_set_enabled(&mch->tseg_window, tseg_size);
     memory_region_set_size(&mch->tseg_window, tseg_size);
-- 
2.39.2