memory: split memory_region_from_host from qemu_ram_addr_from_host

Move the old qemu_ram_addr_from_host to memory_region_from_host and
make it return an offset within the region. For qemu_ram_addr_from_host
return the ram_addr_t directly, similar to what it was before
commit 1b5ec23 ("memory: return MemoryRegion from qemu_ram_addr_from_host",
2013-07-04).

Backports commit 07bdaa4196b51bc7ffa7c3f74e9e4a9dc8a7966a from qemu

qemu/aarch64.h

@@ -2079,6 +2079,7 @@
 #define memory_region_escape_name memory_region_escape_name_aarch64
 #define memory_region_finalize memory_region_finalize_aarch64
 #define memory_region_find memory_region_find_aarch64
+#define memory_region_from_host memory_region_from_host_aarch64
 #define memory_region_get_addr memory_region_get_addr_aarch64
 #define memory_region_get_alignment memory_region_get_alignment_aarch64
 #define memory_region_get_container memory_region_get_container_aarch64

qemu/aarch64eb.h

@@ -2079,6 +2079,7 @@
 #define memory_region_escape_name memory_region_escape_name_aarch64eb
 #define memory_region_finalize memory_region_finalize_aarch64eb
 #define memory_region_find memory_region_find_aarch64eb
+#define memory_region_from_host memory_region_from_host_aarch64eb
 #define memory_region_get_addr memory_region_get_addr_aarch64eb
 #define memory_region_get_alignment memory_region_get_alignment_aarch64eb
 #define memory_region_get_container memory_region_get_container_aarch64eb

qemu/arm.h

@@ -2079,6 +2079,7 @@
 #define memory_region_escape_name memory_region_escape_name_arm
 #define memory_region_finalize memory_region_finalize_arm
 #define memory_region_find memory_region_find_arm
+#define memory_region_from_host memory_region_from_host_arm
 #define memory_region_get_addr memory_region_get_addr_arm
 #define memory_region_get_alignment memory_region_get_alignment_arm
 #define memory_region_get_container memory_region_get_container_arm

qemu/armeb.h

@@ -2079,6 +2079,7 @@
 #define memory_region_escape_name memory_region_escape_name_armeb
 #define memory_region_finalize memory_region_finalize_armeb
 #define memory_region_find memory_region_find_armeb
+#define memory_region_from_host memory_region_from_host_armeb
 #define memory_region_get_addr memory_region_get_addr_armeb
 #define memory_region_get_alignment memory_region_get_alignment_armeb
 #define memory_region_get_container memory_region_get_container_armeb

qemu/cputlb.c

@@ -62,7 +62,7 @@
 
 static void tlb_flush_entry(CPUTLBEntry *tlb_entry, target_ulong addr);
 static bool tlb_is_dirty_ram(CPUTLBEntry *tlbe);
-static bool qemu_ram_addr_from_host_nofail(struct uc_struct *uc, void *ptr, ram_addr_t *addr);
+static ram_addr_t qemu_ram_addr_from_host_nofail(struct uc_struct *uc, void *ptr);
 static void tlb_add_large_page(CPUArchState *env, target_ulong vaddr,
                                target_ulong size);
 static void tlb_set_dirty1(CPUTLBEntry *tlb_entry, target_ulong vaddr);
@@ -307,7 +307,7 @@ tb_page_addr_t get_page_addr_code(CPUArchState *env1, target_ulong addr)
         cpu_ldub_code(env1, addr);
         //check for NX related error from softmmu
         if (env1->invalid_error == UC_ERR_FETCH_PROT) {
-            return -1;
+            return RAM_ADDR_INVALID;
         }
     }
     iotlbentry = &env1->iotlb[mmu_idx][page_index];
@@ -323,26 +323,31 @@ tb_page_addr_t get_page_addr_code(CPUArchState *env1, target_ulong addr)
             //          TARGET_FMT_lx "\n", addr);    // qq
             env1->invalid_addr = addr;
             env1->invalid_error = UC_ERR_FETCH_UNMAPPED;
-            return -1;
+            return RAM_ADDR_INVALID;
         }
     }
     p = (void *)((uintptr_t)addr + env1->tlb_table[mmu_idx][page_index].addend);
-    if (!qemu_ram_addr_from_host_nofail(cpu->uc, p, &ram_addr)) {
+    ram_addr = qemu_ram_addr_from_host_nofail(cpu->uc, p);
+    if (ram_addr == RAM_ADDR_INVALID) {
         env1->invalid_addr = addr;
         env1->invalid_error = UC_ERR_FETCH_UNMAPPED;
-        return -1;
+        return RAM_ADDR_INVALID;
-    } else
+    } else {
         return ram_addr;
+    }
 }
 
-static bool qemu_ram_addr_from_host_nofail(struct uc_struct *uc, void *ptr, ram_addr_t *ram_addr)
+static ram_addr_t qemu_ram_addr_from_host_nofail(struct uc_struct *uc, void *ptr)
 {
-    if (qemu_ram_addr_from_host(uc, ptr, ram_addr) == NULL) {
+    ram_addr_t ram_addr;
+
+    ram_addr = qemu_ram_addr_from_host(uc, ptr);
+    if (ram_addr == RAM_ADDR_INVALID) {
         // fprintf(stderr, "Bad ram pointer %p\n", ptr);
-        return false;
+        return RAM_ADDR_INVALID;
     }
 
-    return true;
+    return ram_addr;
 }
 
 static void tlb_set_dirty1(CPUTLBEntry *tlb_entry, target_ulong vaddr)

qemu/exec.c

@@ -1486,18 +1486,17 @@ RAMBlock *qemu_ram_block_by_name(struct uc_struct* uc, const char *name)
 
 /* Some of the softmmu routines need to translate from a host pointer
    (typically a TLB entry) back to a ram offset.  */
-MemoryRegion *qemu_ram_addr_from_host(struct uc_struct* uc, void *ptr, ram_addr_t *ram_addr)
+ram_addr_t qemu_ram_addr_from_host(struct uc_struct* uc, void *ptr)
 {
     RAMBlock *block;
     ram_addr_t offset;
 
     block = qemu_ram_block_from_host(uc, ptr, false, &offset);
-    *ram_addr = block->offset + offset;
     if (!block) {
-        return NULL;
+        return RAM_ADDR_INVALID;
     }
 
-    return block->mr;
+    return block->offset + offset;
 }
 
 static MemTxResult subpage_read(struct uc_struct* uc, void *opaque, hwaddr addr,
@@ -2301,8 +2300,9 @@ void address_space_unmap(AddressSpace *as, void *buffer, hwaddr len,
         MemoryRegion *mr;
         ram_addr_t addr1;
 
-        mr = qemu_ram_addr_from_host(as->uc, buffer, &addr1);
+        mr = memory_region_from_host(as->uc, buffer, &addr1);
         assert(mr != NULL);
+        addr1 += memory_region_get_ram_addr(mr);
         if (is_write) {
             invalidate_and_set_dirty(mr, addr1, access_len);
         }

qemu/header_gen.py

@@ -2085,6 +2085,7 @@ symbols = (
     'memory_region_escape_name',
     'memory_region_finalize',
     'memory_region_find',
+    'memory_region_from_host',
     'memory_region_get_addr',
     'memory_region_get_alignment',
     'memory_region_get_container',

qemu/include/exec/cpu-common.h

@@ -48,7 +48,7 @@ typedef uint32_t CPUReadMemoryFunc(void *opaque, hwaddr addr);
 
 void qemu_ram_remap(struct uc_struct *uc, ram_addr_t addr, ram_addr_t length);
 /* This should not be used by devices.  */
-MemoryRegion *qemu_ram_addr_from_host(struct uc_struct* uc, void *ptr, ram_addr_t *ram_addr);
+ram_addr_t qemu_ram_addr_from_host(struct uc_struct* uc, void *ptr);
 RAMBlock *qemu_ram_block_by_name(struct uc_struct* uc, const char *name);
 RAMBlock *qemu_ram_block_from_host(struct uc_struct* uc, void *ptr, bool round_offset,
                                    ram_addr_t *offset);

qemu/include/exec/memory.h

@@ -26,6 +26,7 @@
 #include "qom/object.h"
 #include "qemu/typedefs.h"
 
+#define RAM_ADDR_INVALID (~(ram_addr_t)0)
 
 #define MAX_PHYS_ADDR_SPACE_BITS 62
 #define MAX_PHYS_ADDR            (((hwaddr)1 << MAX_PHYS_ADDR_SPACE_BITS) - 1)
@@ -596,6 +597,24 @@ static inline bool memory_region_is_rom(MemoryRegion *mr)
  */
 int memory_region_get_fd(MemoryRegion *mr);
 
+/**
+ * memory_region_from_host: Convert a pointer into a RAM memory region
+ * and an offset within it.
+ *
+ * Given a host pointer inside a RAM memory region (created with
+ * memory_region_init_ram() or memory_region_init_ram_ptr()), return
+ * the MemoryRegion and the offset within it.
+ *
+ * Use with care; by the time this function returns, the returned pointer is
+ * not protected by RCU anymore.  If the caller is not within an RCU critical
+ * section and does not hold the iothread lock, it must have other means of
+ * protecting the pointer, such as a reference to the region that includes
+ * the incoming ram_addr_t.
+ *
+ * @mr: the memory region being queried.
+ */
+MemoryRegion *memory_region_from_host(struct uc_struct *uc, void *ptr, ram_addr_t *offset);
+
 /**
  * memory_region_get_ram_ptr: Get a pointer into a RAM memory region.
  *

qemu/m68k.h

@@ -2079,6 +2079,7 @@
 #define memory_region_escape_name memory_region_escape_name_m68k
 #define memory_region_finalize memory_region_finalize_m68k
 #define memory_region_find memory_region_find_m68k
+#define memory_region_from_host memory_region_from_host_m68k
 #define memory_region_get_addr memory_region_get_addr_m68k
 #define memory_region_get_alignment memory_region_get_alignment_m68k
 #define memory_region_get_container memory_region_get_container_m68k

qemu/memory.c

@@ -1364,6 +1364,18 @@ void *memory_region_get_ram_ptr(MemoryRegion *mr)
     return ptr + offset;
 }
 
+MemoryRegion *memory_region_from_host(struct uc_struct *uc, void *ptr, ram_addr_t *offset)
+{
+    RAMBlock *block;
+
+    block = qemu_ram_block_from_host(uc, ptr, false, offset);
+    if (!block) {
+        return NULL;
+    }
+
+    return block->mr;
+}
+
 ram_addr_t memory_region_get_ram_addr(MemoryRegion *mr)
 {
     return mr->ram_block ? mr->ram_block->offset : RAM_ADDR_INVALID;

qemu/mips.h

@@ -2079,6 +2079,7 @@
 #define memory_region_escape_name memory_region_escape_name_mips
 #define memory_region_finalize memory_region_finalize_mips
 #define memory_region_find memory_region_find_mips
+#define memory_region_from_host memory_region_from_host_mips
 #define memory_region_get_addr memory_region_get_addr_mips
 #define memory_region_get_alignment memory_region_get_alignment_mips
 #define memory_region_get_container memory_region_get_container_mips

qemu/mips64.h

@@ -2079,6 +2079,7 @@
 #define memory_region_escape_name memory_region_escape_name_mips64
 #define memory_region_finalize memory_region_finalize_mips64
 #define memory_region_find memory_region_find_mips64
+#define memory_region_from_host memory_region_from_host_mips64
 #define memory_region_get_addr memory_region_get_addr_mips64
 #define memory_region_get_alignment memory_region_get_alignment_mips64
 #define memory_region_get_container memory_region_get_container_mips64

qemu/mips64el.h

@@ -2079,6 +2079,7 @@
 #define memory_region_escape_name memory_region_escape_name_mips64el
 #define memory_region_finalize memory_region_finalize_mips64el
 #define memory_region_find memory_region_find_mips64el
+#define memory_region_from_host memory_region_from_host_mips64el
 #define memory_region_get_addr memory_region_get_addr_mips64el
 #define memory_region_get_alignment memory_region_get_alignment_mips64el
 #define memory_region_get_container memory_region_get_container_mips64el

qemu/mipsel.h

@@ -2079,6 +2079,7 @@
 #define memory_region_escape_name memory_region_escape_name_mipsel
 #define memory_region_finalize memory_region_finalize_mipsel
 #define memory_region_find memory_region_find_mipsel
+#define memory_region_from_host memory_region_from_host_mipsel
 #define memory_region_get_addr memory_region_get_addr_mipsel
 #define memory_region_get_alignment memory_region_get_alignment_mipsel
 #define memory_region_get_container memory_region_get_container_mipsel

qemu/powerpc.h

@@ -2079,6 +2079,7 @@
 #define memory_region_escape_name memory_region_escape_name_powerpc
 #define memory_region_finalize memory_region_finalize_powerpc
 #define memory_region_find memory_region_find_powerpc
+#define memory_region_from_host memory_region_from_host_powerpc
 #define memory_region_get_addr memory_region_get_addr_powerpc
 #define memory_region_get_alignment memory_region_get_alignment_powerpc
 #define memory_region_get_container memory_region_get_container_powerpc

qemu/sparc.h

@@ -2079,6 +2079,7 @@
 #define memory_region_escape_name memory_region_escape_name_sparc
 #define memory_region_finalize memory_region_finalize_sparc
 #define memory_region_find memory_region_find_sparc
+#define memory_region_from_host memory_region_from_host_sparc
 #define memory_region_get_addr memory_region_get_addr_sparc
 #define memory_region_get_alignment memory_region_get_alignment_sparc
 #define memory_region_get_container memory_region_get_container_sparc

qemu/sparc64.h

@@ -2079,6 +2079,7 @@
 #define memory_region_escape_name memory_region_escape_name_sparc64
 #define memory_region_finalize memory_region_finalize_sparc64
 #define memory_region_find memory_region_find_sparc64
+#define memory_region_from_host memory_region_from_host_sparc64
 #define memory_region_get_addr memory_region_get_addr_sparc64
 #define memory_region_get_alignment memory_region_get_alignment_sparc64
 #define memory_region_get_container memory_region_get_container_sparc64

qemu/x86_64.h

@@ -2079,6 +2079,7 @@
 #define memory_region_escape_name memory_region_escape_name_x86_64
 #define memory_region_finalize memory_region_finalize_x86_64
 #define memory_region_find memory_region_find_x86_64
+#define memory_region_from_host memory_region_from_host_x86_64
 #define memory_region_get_addr memory_region_get_addr_x86_64
 #define memory_region_get_alignment memory_region_get_alignment_x86_64
 #define memory_region_get_container memory_region_get_container_x86_64