Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream' into staging

* docs/atomics fixes and atomic_rcu_* optimization (Emilio)
* NBD bugfix (Eric)
* Memory fixes and cleanups (Paolo, Paul)
* scsi-block support for SCSI status, including persistent
  reservations (Paolo)
* kvm_stat moves to the Linux repository
* SCSI bug fixes (Peter, Prasad)
* Killing qemu_char_get_next_serial, non-ARM parts (Xiaoqiang)

# gpg: Signature made Sun 29 May 2016 08:11:20 BST using RSA key ID 78C7AE83
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>"
# gpg:                 aka "Paolo Bonzini <pbonzini@redhat.com>"

* remotes/bonzini/tags/for-upstream: (30 commits)
  exec: hide mr->ram_addr from qemu_get_ram_ptr users
  memory: split memory_region_from_host from qemu_ram_addr_from_host
  exec: remove ram_addr argument from qemu_ram_block_from_host
  memory: remove qemu_get_ram_fd, qemu_set_ram_fd, qemu_ram_block_host_ptr
  scsi-generic: Merge block max xfer len in INQUIRY response
  scsi-block: always use SG_IO
  scsi-disk: introduce scsi_disk_req_check_error
  scsi-disk: add need_fua_emulation to SCSIDiskClass
  scsi-disk: introduce dma_readv and dma_writev
  scsi-disk: introduce a common base class
  xen-hvm: ignore background I/O sections
  docs/atomics: update comparison with Linux
  atomics: do not emit consume barrier for atomic_rcu_read
  atomics: emit an smp_read_barrier_depends() barrier only for Alpha and Thread Sanitizer
  docs/atomics: update atomic_read/set comparison with Linux
  bt: rewrite csrhci_write to avoid out-of-bounds writes
  block/iscsi: avoid potential overflow of acb->task->cdb
  scsi: megasas: check 'read_queue_head' index value
  scsi: megasas: initialise local configuration data buffer
  scsi: megasas: use appropriate property buffer size
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 33 insertions, 77 deletions

diff --git a/exec.c b/exec.c
index a3a93aeed3..448882154f 100644
--- a/exec.c
+++ b/exec.c
@@ -1815,40 +1815,6 @@ void qemu_ram_remap(ram_addr_t addr, ram_addr_t length)
 }
 #endif /* !_WIN32 */
 
-int qemu_get_ram_fd(ram_addr_t addr)
-{
-    RAMBlock *block;
-    int fd;
-
-    rcu_read_lock();
-    block = qemu_get_ram_block(addr);
-    fd = block->fd;
-    rcu_read_unlock();
-    return fd;
-}
-
-void qemu_set_ram_fd(ram_addr_t addr, int fd)
-{
-    RAMBlock *block;
-
-    rcu_read_lock();
-    block = qemu_get_ram_block(addr);
-    block->fd = fd;
-    rcu_read_unlock();
-}
-
-void *qemu_get_ram_block_host_ptr(ram_addr_t addr)
-{
-    RAMBlock *block;
-    void *ptr;
-
-    rcu_read_lock();
-    block = qemu_get_ram_block(addr);
-    ptr = ramblock_ptr(block, 0);
-    rcu_read_unlock();
-    return ptr;
-}
-
 /* Return a host pointer to ram allocated with qemu_ram_alloc.
  * This should not be used for general purpose DMA.  Use address_space_map
  * or address_space_rw instead. For local memory (e.g. video ram) that the
@@ -1856,12 +1822,13 @@ void *qemu_get_ram_block_host_ptr(ram_addr_t addr)
  *
  * Called within RCU critical section.
  */
-void *qemu_get_ram_ptr(RAMBlock *ram_block, ram_addr_t addr)
+void *qemu_map_ram_ptr(RAMBlock *ram_block, ram_addr_t addr)
 {
     RAMBlock *block = ram_block;
 
     if (block == NULL) {
         block = qemu_get_ram_block(addr);
+        addr -= block->offset;
     }
 
     if (xen_enabled() && block->host == NULL) {
@@ -1875,10 +1842,10 @@ void *qemu_get_ram_ptr(RAMBlock *ram_block, ram_addr_t addr)
 
         block->host = xen_map_cache(block->offset, block->max_length, 1);
     }
-    return ramblock_ptr(block, addr - block->offset);
+    return ramblock_ptr(block, addr);
 }
 
-/* Return a host pointer to guest's ram. Similar to qemu_get_ram_ptr
+/* Return a host pointer to guest's ram. Similar to qemu_map_ram_ptr
  * but takes a size argument.
  *
  * Called within RCU critical section.
@@ -1887,16 +1854,15 @@ static void *qemu_ram_ptr_length(RAMBlock *ram_block, ram_addr_t addr,
                                  hwaddr *size)
 {
     RAMBlock *block = ram_block;
-    ram_addr_t offset_inside_block;
     if (*size == 0) {
         return NULL;
     }
 
     if (block == NULL) {
         block = qemu_get_ram_block(addr);
+        addr -= block->offset;
     }
-    offset_inside_block = addr - block->offset;
-    *size = MIN(*size, block->max_length - offset_inside_block);
+    *size = MIN(*size, block->max_length - addr);
 
     if (xen_enabled() && block->host == NULL) {
         /* We need to check if the requested address is in the RAM
@@ -1910,7 +1876,7 @@ static void *qemu_ram_ptr_length(RAMBlock *ram_block, ram_addr_t addr,
         block->host = xen_map_cache(block->offset, block->max_length, 1);
     }
 
-    return ramblock_ptr(block, offset_inside_block);
+    return ramblock_ptr(block, addr);
 }
 
 /*
@@ -1931,16 +1897,16 @@ static void *qemu_ram_ptr_length(RAMBlock *ram_block, ram_addr_t addr,
  * ram_addr_t.
  */
 RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset,
-                                   ram_addr_t *ram_addr,
                                    ram_addr_t *offset)
 {
     RAMBlock *block;
     uint8_t *host = ptr;
 
     if (xen_enabled()) {
+        ram_addr_t ram_addr;
         rcu_read_lock();
-        *ram_addr = xen_ram_addr_from_mapcache(ptr);
-        block = qemu_get_ram_block(*ram_addr);
+        ram_addr = xen_ram_addr_from_mapcache(ptr);
+        block = qemu_get_ram_block(ram_addr);
         if (block) {
             *offset = (host - block->host);
         }
@@ -1972,7 +1938,6 @@ found:
     if (round_offset) {
         *offset &= TARGET_PAGE_MASK;
     }
-    *ram_addr = block->offset + *offset;
     rcu_read_unlock();
     return block;
 }
@@ -1999,18 +1964,17 @@ RAMBlock *qemu_ram_block_by_name(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(void *ptr, ram_addr_t *ram_addr)
+ram_addr_t qemu_ram_addr_from_host(void *ptr)
 {
     RAMBlock *block;
-    ram_addr_t offset; /* Not used */
-
-    block = qemu_ram_block_from_host(ptr, false, ram_addr, &offset);
+    ram_addr_t offset;
 
+    block = qemu_ram_block_from_host(ptr, false, &offset);
     if (!block) {
-        return NULL;
+        return RAM_ADDR_INVALID;
     }
 
-    return block->mr;
+    return block->offset + offset;
 }
 
 /* Called within RCU critical section.  */
@@ -2022,13 +1986,13 @@ static void notdirty_mem_write(void *opaque, hwaddr ram_addr,
     }
     switch (size) {
     case 1:
-        stb_p(qemu_get_ram_ptr(NULL, ram_addr), val);
+        stb_p(qemu_map_ram_ptr(NULL, ram_addr), val);
         break;
     case 2:
-        stw_p(qemu_get_ram_ptr(NULL, ram_addr), val);
+        stw_p(qemu_map_ram_ptr(NULL, ram_addr), val);
         break;
     case 4:
-        stl_p(qemu_get_ram_ptr(NULL, ram_addr), val);
+        stl_p(qemu_map_ram_ptr(NULL, ram_addr), val);
         break;
     default:
         abort();
@@ -2490,6 +2454,8 @@ static void invalidate_and_set_dirty(MemoryRegion *mr, hwaddr addr,
                                      hwaddr length)
 {
     uint8_t dirty_log_mask = memory_region_get_dirty_log_mask(mr);
+    addr += memory_region_get_ram_addr(mr);
+
     /* No early return if dirty_log_mask is or becomes 0, because
      * cpu_physical_memory_set_dirty_range will still call
      * xen_modified_memory.
@@ -2602,9 +2568,8 @@ static MemTxResult address_space_write_continue(AddressSpace *as, hwaddr addr,
                 abort();
             }
         } else {
-            addr1 += memory_region_get_ram_addr(mr);
             /* RAM case */
-            ptr = qemu_get_ram_ptr(mr->ram_block, addr1);
+            ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
             memcpy(ptr, buf, l);
             invalidate_and_set_dirty(mr, addr1, l);
         }
@@ -2695,8 +2660,7 @@ MemTxResult address_space_read_continue(AddressSpace *as, hwaddr addr,
             }
         } else {
             /* RAM case */
-            ptr = qemu_get_ram_ptr(mr->ram_block,
-                                   memory_region_get_ram_addr(mr) + addr1);
+            ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
             memcpy(buf, ptr, l);
         }
 
@@ -2779,9 +2743,8 @@ static inline void cpu_physical_memory_write_rom_internal(AddressSpace *as,
               memory_region_is_romd(mr))) {
             l = memory_access_size(mr, l, addr1);
         } else {
-            addr1 += memory_region_get_ram_addr(mr);
             /* ROM/RAM case */
-            ptr = qemu_get_ram_ptr(mr->ram_block, addr1);
+            ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
             switch (type) {
             case WRITE_DATA:
                 memcpy(ptr, buf, l);
@@ -2939,7 +2902,6 @@ void *address_space_map(AddressSpace *as,
     hwaddr done = 0;
     hwaddr l, xlat, base;
     MemoryRegion *mr, *this_mr;
-    ram_addr_t raddr;
     void *ptr;
 
     if (len == 0) {
@@ -2974,7 +2936,6 @@ void *address_space_map(AddressSpace *as,
     }
 
     base = xlat;
-    raddr = memory_region_get_ram_addr(mr);
 
     for (;;) {
         len -= l;
@@ -2993,7 +2954,7 @@ void *address_space_map(AddressSpace *as,
 
     memory_region_ref(mr);
     *plen = done;
-    ptr = qemu_ram_ptr_length(mr->ram_block, raddr + base, plen);
+    ptr = qemu_ram_ptr_length(mr->ram_block, base, plen);
     rcu_read_unlock();
 
     return ptr;
@@ -3010,7 +2971,7 @@ void address_space_unmap(AddressSpace *as, void *buffer, hwaddr len,
         MemoryRegion *mr;
         ram_addr_t addr1;
 
-        mr = qemu_ram_addr_from_host(buffer, &addr1);
+        mr = memory_region_from_host(buffer, &addr1);
         assert(mr != NULL);
         if (is_write) {
             invalidate_and_set_dirty(mr, addr1, access_len);
@@ -3077,8 +3038,7 @@ static inline uint32_t address_space_ldl_internal(AddressSpace *as, hwaddr addr,
 #endif
     } else {
         /* RAM case */
-        ptr = qemu_get_ram_ptr(mr->ram_block,
-                               memory_region_get_ram_addr(mr) + addr1);
+        ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
         switch (endian) {
         case DEVICE_LITTLE_ENDIAN:
             val = ldl_le_p(ptr);
@@ -3171,8 +3131,7 @@ static inline uint64_t address_space_ldq_internal(AddressSpace *as, hwaddr addr,
 #endif
     } else {
         /* RAM case */
-        ptr = qemu_get_ram_ptr(mr->ram_block,
-                               memory_region_get_ram_addr(mr) + addr1);
+        ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
         switch (endian) {
         case DEVICE_LITTLE_ENDIAN:
             val = ldq_le_p(ptr);
@@ -3285,8 +3244,7 @@ static inline uint32_t address_space_lduw_internal(AddressSpace *as,
 #endif
     } else {
         /* RAM case */
-        ptr = qemu_get_ram_ptr(mr->ram_block,
-                               memory_region_get_ram_addr(mr) + addr1);
+        ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
         switch (endian) {
         case DEVICE_LITTLE_ENDIAN:
             val = lduw_le_p(ptr);
@@ -3368,13 +3326,13 @@ void address_space_stl_notdirty(AddressSpace *as, hwaddr addr, uint32_t val,
 
         r = memory_region_dispatch_write(mr, addr1, val, 4, attrs);
     } else {
-        addr1 += memory_region_get_ram_addr(mr);
-        ptr = qemu_get_ram_ptr(mr->ram_block, addr1);
+        ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
         stl_p(ptr, val);
 
         dirty_log_mask = memory_region_get_dirty_log_mask(mr);
         dirty_log_mask &= ~(1 << DIRTY_MEMORY_CODE);
-        cpu_physical_memory_set_dirty_range(addr1, 4, dirty_log_mask);
+        cpu_physical_memory_set_dirty_range(memory_region_get_ram_addr(mr) + addr,
+                                            4, dirty_log_mask);
         r = MEMTX_OK;
     }
     if (result) {
@@ -3423,8 +3381,7 @@ static inline void address_space_stl_internal(AddressSpace *as,
         r = memory_region_dispatch_write(mr, addr1, val, 4, attrs);
     } else {
         /* RAM case */
-        addr1 += memory_region_get_ram_addr(mr);
-        ptr = qemu_get_ram_ptr(mr->ram_block, addr1);
+        ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
         switch (endian) {
         case DEVICE_LITTLE_ENDIAN:
             stl_le_p(ptr, val);
@@ -3533,8 +3490,7 @@ static inline void address_space_stw_internal(AddressSpace *as,
         r = memory_region_dispatch_write(mr, addr1, val, 2, attrs);
     } else {
         /* RAM case */
-        addr1 += memory_region_get_ram_addr(mr);
-        ptr = qemu_get_ram_ptr(mr->ram_block, addr1);
+        ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
         switch (endian) {
         case DEVICE_LITTLE_ENDIAN:
             stw_le_p(ptr, val);