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exec: hide mr->ram_addr from qemu_get_ram_ptr users
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Let users of qemu_get_ram_ptr and qemu_ram_ptr_length pass in an
address that is relative to the MemoryRegion.  This basically means
what address_space_translate returns.

Because the semantics of the second parameter change, rename the
function to qemu_map_ram_ptr.

Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@bonzini
bonzini committed May 29, 2016
1 parent 07bdaa4 commit 0878d0e
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Showing 4 changed files with 31 additions and 54 deletions.
57 changes: 24 additions & 33 deletions exec.c
View file
Expand Up @@ -1822,12 +1822,13 @@ void qemu_ram_remap(ram_addr_t addr, ram_addr_t length)
*
* 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) {
Expand All @@ -1841,10 +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.
Expand All @@ -1853,16 +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
Expand All @@ -1876,7 +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);
}

/*
Expand Down Expand Up @@ -1986,13 +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();
Expand Down Expand Up @@ -2454,6 +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.
Expand Down Expand Up @@ -2566,9 +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);
}
Expand Down Expand Up @@ -2659,8 +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);
}

Expand Down Expand Up @@ -2743,9 +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);
Expand Down Expand Up @@ -2903,7 +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) {
Expand Down Expand Up @@ -2938,7 +2936,6 @@ void *address_space_map(AddressSpace *as,
}

base = xlat;
raddr = memory_region_get_ram_addr(mr);

for (;;) {
len -= l;
Expand All @@ -2957,7 +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;
Expand All @@ -2976,7 +2973,6 @@ void address_space_unmap(AddressSpace *as, void *buffer, hwaddr len,

mr = memory_region_from_host(buffer, &addr1);
assert(mr != NULL);
addr1 += memory_region_get_ram_addr(mr);
if (is_write) {
invalidate_and_set_dirty(mr, addr1, access_len);
}
Expand Down Expand Up @@ -3042,8 +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);
Expand Down Expand Up @@ -3136,8 +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);
Expand Down Expand Up @@ -3250,8 +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);
Expand Down Expand Up @@ -3333,13 +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) {
Expand Down Expand Up @@ -3388,8 +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);
Expand Down Expand Up @@ -3498,8 +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);
Expand Down
5 changes: 2 additions & 3 deletions include/exec/memory.h
View file
Expand Up @@ -1393,7 +1393,7 @@ MemTxResult address_space_read_continue(AddressSpace *as, hwaddr addr,
MemoryRegion *mr);
MemTxResult address_space_read_full(AddressSpace *as, hwaddr addr,
MemTxAttrs attrs, uint8_t *buf, int len);
void *qemu_get_ram_ptr(RAMBlock *ram_block, ram_addr_t addr);
void *qemu_map_ram_ptr(RAMBlock *ram_block, ram_addr_t addr);

static inline bool memory_access_is_direct(MemoryRegion *mr, bool is_write)
{
Expand Down Expand Up @@ -1431,8 +1431,7 @@ MemTxResult address_space_read(AddressSpace *as, hwaddr addr, MemTxAttrs attrs,
l = len;
mr = address_space_translate(as, addr, &addr1, &l, false);
if (len == l && memory_access_is_direct(mr, false)) {
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);
memcpy(buf, ptr, len);
} else {
result = address_space_read_continue(as, addr, attrs, buf, len,
Expand Down
4 changes: 2 additions & 2 deletions memory.c
View file
Expand Up @@ -1657,10 +1657,10 @@ void *memory_region_get_ram_ptr(MemoryRegion *mr)
mr = mr->alias;
}
assert(mr->ram_block);
ptr = qemu_get_ram_ptr(mr->ram_block, memory_region_get_ram_addr(mr));
ptr = qemu_map_ram_ptr(mr->ram_block, offset);
rcu_read_unlock();

return ptr + offset;
return ptr;
}

MemoryRegion *memory_region_from_host(void *ptr, ram_addr_t *offset)
Expand Down
19 changes: 3 additions & 16 deletions scripts/dump-guest-memory.py
View file
Expand Up @@ -328,31 +328,18 @@ def qlist_foreach(head, field_str):
yield var


def qemu_get_ram_block(ram_addr):
"""Returns the RAMBlock struct to which the given address belongs."""

ram_blocks = gdb.parse_and_eval("ram_list.blocks")

for block in qlist_foreach(ram_blocks, "next"):
if (ram_addr - block["offset"]) < block["used_length"]:
return block

raise gdb.GdbError("Bad ram offset %x" % ram_addr)


def qemu_get_ram_ptr(ram_addr):
def qemu_map_ram_ptr(block, offset):
"""Returns qemu vaddr for given guest physical address."""

block = qemu_get_ram_block(ram_addr)
return block["host"] + (ram_addr - block["offset"])
return block["host"] + offset


def memory_region_get_ram_ptr(memory_region):
if memory_region["alias"] != 0:
return (memory_region_get_ram_ptr(memory_region["alias"].dereference())
+ memory_region["alias_offset"])

return qemu_get_ram_ptr(memory_region["ram_block"]["offset"])
return qemu_map_ram_ptr(memory_region["ram_block"], 0)


def get_guest_phys_blocks():
Expand Down

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