[PULL 10/16] i386/pc: factor out cxl range start to helper

[Michael S. Tsirkin]

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

Factor out the calculation of the base address of the memory region.
It will be used later on for the cxl range end counterpart calculation
and as well in pc_memory_init() CXL memory region initialization, thus
avoiding duplication.

Cc: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Acked-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20220719170014.27028-7-joao.m.martins@oracle.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/i386/pc.c | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index cb27309e76..9e1a067c41 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -825,6 +825,22 @@ static hwaddr pc_above_4g_end(PCMachineState *pcms)
     return x86ms->above_4g_mem_start + x86ms->above_4g_mem_size;
 }
 
+static uint64_t pc_get_cxl_range_start(PCMachineState *pcms)
+{
+    PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
+    MachineState *machine = MACHINE(pcms);
+    hwaddr cxl_base;
+
+    if (pcmc->has_reserved_memory && machine->device_memory->base) {
+        cxl_base = machine->device_memory->base
+            + memory_region_size(&machine->device_memory->mr);
+    } else {
+        cxl_base = pc_above_4g_end(pcms);
+    }
+
+    return cxl_base;
+}
+
 static uint64_t pc_get_cxl_range_end(PCMachineState *pcms)
 {
     uint64_t start = 0;
@@ -946,13 +962,7 @@ void pc_memory_init(PCMachineState *pcms,
         MemoryRegion *mr = &pcms->cxl_devices_state.host_mr;
         hwaddr cxl_size = MiB;
 
-        if (pcmc->has_reserved_memory && machine->device_memory->base) {
-            cxl_base = machine->device_memory->base
-                + memory_region_size(&machine->device_memory->mr);
-        } else {
-            cxl_base = pc_above_4g_end(pcms);
-        }
-
+        cxl_base = pc_get_cxl_range_start(pcms);
         e820_add_entry(cxl_base, cxl_size, E820_RESERVED);
         memory_region_init(mr, OBJECT(machine), "cxl_host_reg", cxl_size);
         memory_region_add_subregion(system_memory, cxl_base, mr);
-- 
MST