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scripts/dump-guest-memory.py: Make methods functions 

The functions dealing with qemu components rarely used parts of the
class, so they were moved out of the class.

As the uintptr_t variable is needed both within and outside the class,
it was made a constant and moved to the top.

Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Message-Id: <1453464520-3882-3-git-send-email-frankja@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
pull/36/head
Janosch Frank 11 years ago
committed by Paolo Bonzini
parent
ca81ce72b4
commit
4789020384
1 changed files with 93 additions and 91 deletions
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  1. 184
      scripts/dump-guest-memory.py

184
scripts/dump-guest-memory.py
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@ -17,6 +17,8 @@
import struct
UINTPTR_T = gdb.lookup_type("uintptr_t")
TARGET_PAGE_SIZE = 0x1000
TARGET_PAGE_MASK = 0xFFFFFFFFFFFFF000
@ -66,6 +68,94 @@ ELF64_PHDR = ("I" # p_type
"Q" # p_align
)
def int128_get64(val):
assert (val["hi"] == 0)
return val["lo"]
def qlist_foreach(head, field_str):
var_p = head["lh_first"]
while (var_p != 0):
var = var_p.dereference()
yield var
var_p = var[field_str]["le_next"]
def qemu_get_ram_block(ram_addr):
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):
block = qemu_get_ram_block(ram_addr)
return block["host"] + (ram_addr - block["offset"])
def memory_region_get_ram_ptr(mr):
if (mr["alias"] != 0):
return (memory_region_get_ram_ptr(mr["alias"].dereference()) +
mr["alias_offset"])
return qemu_get_ram_ptr(mr["ram_addr"] & TARGET_PAGE_MASK)
def get_guest_phys_blocks():
guest_phys_blocks = []
print "guest RAM blocks:"
print ("target_start target_end host_addr message "
"count")
print ("---------------- ---------------- ---------------- ------- "
"-----")
current_map_p = gdb.parse_and_eval("address_space_memory.current_map")
current_map = current_map_p.dereference()
for cur in range(current_map["nr"]):
flat_range = (current_map["ranges"] + cur).dereference()
mr = flat_range["mr"].dereference()
# we only care about RAM
if (not mr["ram"]):
continue
section_size = int128_get64(flat_range["addr"]["size"])
target_start = int128_get64(flat_range["addr"]["start"])
target_end = target_start + section_size
host_addr = (memory_region_get_ram_ptr(mr) +
flat_range["offset_in_region"])
predecessor = None
# find continuity in guest physical address space
if (len(guest_phys_blocks) > 0):
predecessor = guest_phys_blocks[-1]
predecessor_size = (predecessor["target_end"] -
predecessor["target_start"])
# the memory API guarantees monotonically increasing
# traversal
assert (predecessor["target_end"] <= target_start)
# we want continuity in both guest-physical and
# host-virtual memory
if (predecessor["target_end"] < target_start or
predecessor["host_addr"] + predecessor_size != host_addr):
predecessor = None
if (predecessor is None):
# isolated mapping, add it to the list
guest_phys_blocks.append({"target_start": target_start,
"target_end" : target_end,
"host_addr" : host_addr})
message = "added"
else:
# expand predecessor until @target_end; predecessor's
# start doesn't change
predecessor["target_end"] = target_end
message = "joined"
print ("%016x %016x %016x %-7s %5u" %
(target_start, target_end, host_addr.cast(UINTPTR_T),
message, len(guest_phys_blocks)))
return guest_phys_blocks
class DumpGuestMemory(gdb.Command):
"""Extract guest vmcore from qemu process coredump.
@ -100,96 +190,9 @@ shape and this command should mostly work."""
super(DumpGuestMemory, self).__init__("dump-guest-memory",
gdb.COMMAND_DATA,
gdb.COMPLETE_FILENAME)
self.uintptr_t = gdb.lookup_type("uintptr_t")
self.elf64_ehdr_le = struct.Struct("<%s" % ELF64_EHDR)
self.elf64_phdr_le = struct.Struct("<%s" % ELF64_PHDR)
def int128_get64(self, val):
assert (val["hi"] == 0)
return val["lo"]
def qlist_foreach(self, head, field_str):
var_p = head["lh_first"]
while (var_p != 0):
var = var_p.dereference()
yield var
var_p = var[field_str]["le_next"]
def qemu_get_ram_block(self, ram_addr):
ram_blocks = gdb.parse_and_eval("ram_list.blocks")
for block in self.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(self, ram_addr):
block = self.qemu_get_ram_block(ram_addr)
return block["host"] + (ram_addr - block["offset"])
def memory_region_get_ram_ptr(self, mr):
if (mr["alias"] != 0):
return (self.memory_region_get_ram_ptr(mr["alias"].dereference()) +
mr["alias_offset"])
return self.qemu_get_ram_ptr(mr["ram_addr"] & TARGET_PAGE_MASK)
def guest_phys_blocks_init(self):
self.guest_phys_blocks = []
def guest_phys_blocks_append(self):
print "guest RAM blocks:"
print ("target_start target_end host_addr message "
"count")
print ("---------------- ---------------- ---------------- ------- "
"-----")
current_map_p = gdb.parse_and_eval("address_space_memory.current_map")
current_map = current_map_p.dereference()
for cur in range(current_map["nr"]):
flat_range = (current_map["ranges"] + cur).dereference()
mr = flat_range["mr"].dereference()
# we only care about RAM
if (not mr["ram"]):
continue
section_size = self.int128_get64(flat_range["addr"]["size"])
target_start = self.int128_get64(flat_range["addr"]["start"])
target_end = target_start + section_size
host_addr = (self.memory_region_get_ram_ptr(mr) +
flat_range["offset_in_region"])
predecessor = None
# find continuity in guest physical address space
if (len(self.guest_phys_blocks) > 0):
predecessor = self.guest_phys_blocks[-1]
predecessor_size = (predecessor["target_end"] -
predecessor["target_start"])
# the memory API guarantees monotonically increasing
# traversal
assert (predecessor["target_end"] <= target_start)
# we want continuity in both guest-physical and
# host-virtual memory
if (predecessor["target_end"] < target_start or
predecessor["host_addr"] + predecessor_size != host_addr):
predecessor = None
if (predecessor is None):
# isolated mapping, add it to the list
self.guest_phys_blocks.append({"target_start": target_start,
"target_end" : target_end,
"host_addr" : host_addr})
message = "added"
else:
# expand predecessor until @target_end; predecessor's
# start doesn't change
predecessor["target_end"] = target_end
message = "joined"
print ("%016x %016x %016x %-7s %5u" %
(target_start, target_end, host_addr.cast(self.uintptr_t),
message, len(self.guest_phys_blocks)))
self.guest_phys_blocks = None
def cpu_get_dump_info(self):
# We can't synchronize the registers with KVM post-mortem, and
@ -263,8 +266,7 @@ shape and this command should mostly work."""
len(name) + 1, len(desc), type, name, desc)
def dump_init(self):
self.guest_phys_blocks_init()
self.guest_phys_blocks_append()
self.guest_phys_blocks = get_guest_phys_blocks()
self.cpu_get_dump_info()
# we have no way to retrieve the VCPU status from KVM
# post-mortem
@ -310,7 +312,7 @@ shape and this command should mostly work."""
cur = block["host_addr"]
left = block["target_end"] - block["target_start"]
print ("dumping range at %016x for length %016x" %
(cur.cast(self.uintptr_t), left))
(cur.cast(UINTPTR_T), left))
while (left > 0):
chunk_size = min(TARGET_PAGE_SIZE, left)
chunk = qemu_core.read_memory(cur, chunk_size)

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