[Qemu-devel] [PATCH V2 1/4] hw/pc: extract reserved memory end computation to a standalone function

[Marcel Apfelbaum <marcel@redhat.com>]

This code will be reused when calculating 64-bit MMIO hotplug ranges.

Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
---
 hw/i386/pc.c         | 29 +++++++++++++++++++++--------
 include/hw/i386/pc.h |  1 +
 2 files changed, 22 insertions(+), 8 deletions(-)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 99437e0..a7791e3 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1280,6 +1280,7 @@ void pc_memory_init(PCMachineState *pcms,
     FWCfgState *fw_cfg;
     MachineState *machine = MACHINE(pcms);
     PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
+    uint64_t res_mem_end;
 
     assert(machine->ram_size == pcms->below_4g_mem_size +
                                 pcms->above_4g_mem_size);
@@ -1375,15 +1376,10 @@ void pc_memory_init(PCMachineState *pcms,
 
     rom_set_fw(fw_cfg);
 
-    if (pcmc->has_reserved_memory && pcms->hotplug_memory.base) {
+    res_mem_end = pc_machine_get_reserved_memory_end(pcms);
+    if (res_mem_end) {
         uint64_t *val = g_malloc(sizeof(*val));
-        PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
-        uint64_t res_mem_end = pcms->hotplug_memory.base;
-
-        if (!pcmc->broken_reserved_end) {
-            res_mem_end += memory_region_size(&pcms->hotplug_memory.mr);
-        }
-        *val = cpu_to_le64(ROUND_UP(res_mem_end, 0x1ULL << 30));
+        *val = cpu_to_le64(res_mem_end);
         fw_cfg_add_file(fw_cfg, "etc/reserved-memory-end", val, sizeof(*val));
     }
 
@@ -1853,6 +1849,23 @@ bool pc_machine_is_smm_enabled(PCMachineState *pcms)
     return false;
 }
 
+uint64_t pc_machine_get_reserved_memory_end(PCMachineState *pcms)
+{
+    PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
+    uint64_t res_mem_end = 0;
+
+    if (pcmc->has_reserved_memory && pcms->hotplug_memory.base) {
+        res_mem_end = pcms->hotplug_memory.base;
+
+        if (!pcmc->broken_reserved_end) {
+            res_mem_end += memory_region_size(&pcms->hotplug_memory.mr);
+        }
+        res_mem_end = ROUND_UP(res_mem_end, 0x1ULL << 30);
+    }
+
+    return res_mem_end;
+}
+
 static void pc_machine_get_smm(Object *obj, Visitor *v, const char *name,
                                void *opaque, Error **errp)
 {
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 96f0b66..7c25814 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -223,6 +223,7 @@ void i8042_setup_a20_line(ISADevice *dev, qemu_irq *a20_out);
 extern int fd_bootchk;
 
 bool pc_machine_is_smm_enabled(PCMachineState *pcms);
+uint64_t pc_machine_get_reserved_memory_end(PCMachineState *pcms);
 void pc_register_ferr_irq(qemu_irq irq);
 void pc_acpi_smi_interrupt(void *opaque, int irq, int level);
 
-- 
2.4.3