spapr: Remove obsolete ram_limit field from sPAPRMachineState

The ram_limit field was imported from sPAPREnvironment where it predates
the machine's ram size being available generically from machine->ram_size.

Worse, the existing code was inconsistent about where it got the ram size
from.  Sometimes it used spapr->ram_limit, sometimes the global 'ram_size'
and sometimes a local 'ram_size' masking the global.

This cleans up the code to consistently use machine->ram_size, eliminating
spapr->ram_limit in the process.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>

hw/ppc/spapr.c

@@ -265,15 +265,18 @@ static size_t create_page_sizes_prop(CPUPPCState *env, uint32_t *prop,
 
 static hwaddr spapr_node0_size(void)
 {
+    MachineState *machine = MACHINE(qdev_get_machine());
+
     if (nb_numa_nodes) {
         int i;
         for (i = 0; i < nb_numa_nodes; ++i) {
             if (numa_info[i].node_mem) {
-                return MIN(pow2floor(numa_info[i].node_mem), ram_size);
+                return MIN(pow2floor(numa_info[i].node_mem),
+                           machine->ram_size);
             }
         }
     }
-    return ram_size;
+    return machine->ram_size;
 }
 
 #define _FDT(exp) \
@@ -649,6 +652,7 @@ static void spapr_populate_memory_node(void *fdt, int nodeid, hwaddr start,
 
 static int spapr_populate_memory(sPAPRMachineState *spapr, void *fdt)
 {
+    MachineState *machine = MACHINE(spapr);
     hwaddr mem_start, node_size;
     int i, nb_nodes = nb_numa_nodes;
     NodeInfo *nodes = numa_info;
@@ -657,7 +661,7 @@ static int spapr_populate_memory(sPAPRMachineState *spapr, void *fdt)
     /* No NUMA nodes, assume there is just one node with whole RAM */
     if (!nb_numa_nodes) {
         nb_nodes = 1;
-        ramnode.node_mem = ram_size;
+        ramnode.node_mem = machine->ram_size;
         nodes = &ramnode;
     }
 
@@ -665,12 +669,12 @@ static int spapr_populate_memory(sPAPRMachineState *spapr, void *fdt)
         if (!nodes[i].node_mem) {
             continue;
         }
-        if (mem_start >= ram_size) {
+        if (mem_start >= machine->ram_size) {
             node_size = 0;
         } else {
             node_size = nodes[i].node_mem;
-            if (node_size > ram_size - mem_start) {
-                node_size = ram_size - mem_start;
+            if (node_size > machine->ram_size - mem_start) {
+                node_size = machine->ram_size - mem_start;
             }
         }
         if (!mem_start) {
@@ -1374,7 +1378,6 @@ static void spapr_boot_set(void *opaque, const char *boot_device,
 static void ppc_spapr_init(MachineState *machine)
 {
     sPAPRMachineState *spapr = SPAPR_MACHINE(machine);
-    ram_addr_t ram_size = machine->ram_size;
     const char *cpu_model = machine->cpu_model;
     const char *kernel_filename = machine->kernel_filename;
     const char *kernel_cmdline = machine->kernel_cmdline;
@@ -1443,7 +1446,7 @@ static void ppc_spapr_init(MachineState *machine)
      * more than needed for the Linux guests we support. */
     spapr->htab_shift = 18; /* Minimum architected size */
     while (spapr->htab_shift <= 46) {
-        if ((1ULL << (spapr->htab_shift + 7)) >= ram_size) {
+        if ((1ULL << (spapr->htab_shift + 7)) >= machine->ram_size) {
             break;
         }
         spapr->htab_shift++;
@@ -1497,9 +1500,8 @@ static void ppc_spapr_init(MachineState *machine)
     }
 
     /* allocate RAM */
-    spapr->ram_limit = ram_size;
     memory_region_allocate_system_memory(ram, NULL, "ppc_spapr.ram",
-                                         spapr->ram_limit);
+                                         machine->ram_size);
     memory_region_add_subregion(sysmem, 0, ram);
 
     if (rma_alloc_size && rma) {

hw/ppc/spapr_hcall.c

@@ -87,6 +87,7 @@ static inline bool valid_pte_index(CPUPPCState *env, target_ulong pte_index)
 static target_ulong h_enter(PowerPCCPU *cpu, sPAPRMachineState *spapr,
                             target_ulong opcode, target_ulong *args)
 {
+    MachineState *machine = MACHINE(spapr);
     CPUPPCState *env = &cpu->env;
     target_ulong flags = args[0];
     target_ulong pte_index = args[1];
@@ -118,7 +119,7 @@ static target_ulong h_enter(PowerPCCPU *cpu, sPAPRMachineState *spapr,
 
     raddr = (ptel & HPTE64_R_RPN) & ~((1ULL << page_shift) - 1);
 
-    if (raddr < spapr->ram_limit) {
+    if (raddr < machine->ram_size) {
         /* Regular RAM - should have WIMG=0010 */
         if ((ptel & HPTE64_R_WIMG) != HPTE64_R_M) {
             return H_PARAMETER;

include/hw/ppc/spapr.h

@@ -33,7 +33,6 @@ struct sPAPRMachineState {
     XICSState *icp;
     DeviceState *rtc;
 
-    hwaddr ram_limit;
     void *htab;
     uint32_t htab_shift;
     hwaddr rma_size;