nvram: Introduce helper functions for CHRP "system" and "free space" partitions

[qemu.git] / exec.c

diff --git a/exec.c b/exec.c
index e63c5a1bd4d5ef4a14aaae5ea5040751407a8f5a..4c84389b565af1c06eccb9429b7635f92b544d5f 100644 (file)
--- a/exec.c
+++ b/exec.c
@@ -93,6 +93,11 @@ static MemoryRegion io_mem_unassigned;
 
 #endif
 
+#ifdef TARGET_PAGE_BITS_VARY
+int target_page_bits;
+bool target_page_bits_decided;
+#endif
+
 struct CPUTailQ cpus = QTAILQ_HEAD_INITIALIZER(cpus);
 /* current CPU in the current thread. It is only valid inside
    cpu_exec() */
@@ -102,8 +107,37 @@ __thread CPUState *current_cpu;
    2 = Adaptive rate instruction counting.  */
 int use_icount;
 
+bool set_preferred_target_page_bits(int bits)
+{
+    /* The target page size is the lowest common denominator for all
+     * the CPUs in the system, so we can only make it smaller, never
+     * larger. And we can't make it smaller once we've committed to
+     * a particular size.
+     */
+#ifdef TARGET_PAGE_BITS_VARY
+    assert(bits >= TARGET_PAGE_BITS_MIN);
+    if (target_page_bits == 0 || target_page_bits > bits) {
+        if (target_page_bits_decided) {
+            return false;
+        }
+        target_page_bits = bits;
+    }
+#endif
+    return true;
+}
+
 #if !defined(CONFIG_USER_ONLY)
 
+static void finalize_target_page_bits(void)
+{
+#ifdef TARGET_PAGE_BITS_VARY
+    if (target_page_bits == 0) {
+        target_page_bits = TARGET_PAGE_BITS_MIN;
+    }
+    target_page_bits_decided = true;
+#endif
+}
+
 typedef struct PhysPageEntry PhysPageEntry;
 
 struct PhysPageEntry {
@@ -153,7 +187,7 @@ typedef struct subpage_t {
     MemoryRegion iomem;
     AddressSpace *as;
     hwaddr base;
-    uint16_t sub_section[TARGET_PAGE_SIZE];
+    uint16_t sub_section[];
 } subpage_t;
 
 #define PHYS_SECTION_UNASSIGNED 0
@@ -318,9 +352,9 @@ static inline bool section_covers_addr(const MemoryRegionSection *section,
     /* Memory topology clips a memory region to [0, 2^64); size.hi > 0 means
      * the section must cover the entire address space.
      */
-    return section->size.hi ||
+    return int128_gethi(section->size) ||
            range_covers_byte(section->offset_within_address_space,
-                             section->size.lo, addr);
+                             int128_getlo(section->size), addr);
 }
 
 static MemoryRegionSection *phys_page_find(PhysPageEntry lp, hwaddr addr,
@@ -596,7 +630,7 @@ AddressSpace *cpu_get_address_space(CPUState *cpu, int asidx)
 }
 #endif
 
-void cpu_exec_exit(CPUState *cpu)
+void cpu_exec_unrealizefn(CPUState *cpu)
 {
     CPUClass *cc = CPU_GET_CLASS(cpu);
 
@@ -610,11 +644,8 @@ void cpu_exec_exit(CPUState *cpu)
     }
 }
 
-void cpu_exec_init(CPUState *cpu, Error **errp)
+void cpu_exec_initfn(CPUState *cpu)
 {
-    CPUClass *cc ATTRIBUTE_UNUSED = CPU_GET_CLASS(cpu);
-    Error *local_err ATTRIBUTE_UNUSED = NULL;
-
     cpu->as = NULL;
     cpu->num_ases = 0;
 
@@ -635,6 +666,11 @@ void cpu_exec_init(CPUState *cpu, Error **errp)
     cpu->memory = system_memory;
     object_ref(OBJECT(cpu->memory));
 #endif
+}
+
+void cpu_exec_realizefn(CPUState *cpu, Error **errp)
+{
+    CPUClass *cc ATTRIBUTE_UNUSED = CPU_GET_CLASS(cpu);
 
     cpu_list_add(cpu);
 
@@ -1254,7 +1290,12 @@ static void *file_ram_alloc(RAMBlock *block,
     }
 
     block->page_size = qemu_fd_getpagesize(fd);
-    block->mr->align = MAX(block->page_size, QEMU_VMALLOC_ALIGN);
+    block->mr->align = block->page_size;
+#if defined(__s390x__)
+    if (kvm_enabled()) {
+        block->mr->align = MAX(block->mr->align, QEMU_VMALLOC_ALIGN);
+    }
+#endif
 
     if (memory < block->page_size) {
         error_setg(errp, "memory size 0x" RAM_ADDR_FMT " must be equal to "
@@ -2210,8 +2251,7 @@ static subpage_t *subpage_init(AddressSpace *as, hwaddr base)
 {
     subpage_t *mmio;
 
-    mmio = g_malloc0(sizeof(subpage_t));
-
+    mmio = g_malloc0(sizeof(subpage_t) + TARGET_PAGE_SIZE * sizeof(uint16_t));
     mmio->as = as;
     mmio->base = base;
     memory_region_init_io(&mmio->iomem, NULL, &subpage_ops, mmio,
@@ -2803,6 +2843,14 @@ void cpu_register_map_client(QEMUBH *bh)
 void cpu_exec_init_all(void)
 {
     qemu_mutex_init(&ram_list.mutex);
+    /* The data structures we set up here depend on knowing the page size,
+     * so no more changes can be made after this point.
+     * In an ideal world, nothing we did before we had finished the
+     * machine setup would care about the target page size, and we could
+     * do this much later, rather than requiring board models to state
+     * up front what their requirements are.
+     */
+    finalize_target_page_bits();
     io_mem_init();
     memory_map_init();
     qemu_mutex_init(&map_client_list_lock);