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Blame SOURCES/kvm-scripts-dump-guest-memory.py-Make-methods-functions.patch

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From 0e125906f0e8bd7015569e7c76b687e4aacb3cca Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= <marcandre.lureau@redhat.com>
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Date: Wed, 13 Dec 2017 13:39:05 +0100
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Subject: [PATCH 34/41] scripts/dump-guest-memory.py: Make methods functions
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Marc-André Lureau <marcandre.lureau@redhat.com>
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Message-id: <20171213133912.26176-35-marcandre.lureau@redhat.com>
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Patchwork-id: 78384
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O-Subject: [RHEL-7.5 qemu-kvm PATCH v3 34/41] scripts/dump-guest-memory.py: Make methods functions
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Bugzilla: 1411490
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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From: Janosch Frank <frankja@linux.vnet.ibm.com>
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The functions dealing with qemu components rarely used parts of the
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class, so they were moved out of the class.
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As the uintptr_t variable is needed both within and outside the class,
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it was made a constant and moved to the top.
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Reviewed-by: Laszlo Ersek <lersek@redhat.com>
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Signed-off-by: Janosch Frank <frankja@linux.vnet.ibm.com>
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Message-Id: <1453464520-3882-3-git-send-email-frankja@linux.vnet.ibm.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit 47890203842de8b29716bdffb406ca851e70829d)
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RHEL: conflicts due to qtailq->qlist, used_length->length
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Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 scripts/dump-guest-memory.py | 184 ++++++++++++++++++++++---------------------
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 1 file changed, 93 insertions(+), 91 deletions(-)
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diff --git a/scripts/dump-guest-memory.py b/scripts/dump-guest-memory.py
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index 29f7c5b..7d93d86 100644
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--- a/scripts/dump-guest-memory.py
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+++ b/scripts/dump-guest-memory.py
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@@ -17,6 +17,8 @@
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 import struct
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+UINTPTR_T = gdb.lookup_type("uintptr_t")
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+
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 TARGET_PAGE_SIZE = 0x1000
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 TARGET_PAGE_MASK = 0xFFFFFFFFFFFFF000
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@@ -66,6 +68,94 @@ ELF64_PHDR = ("I"  # p_type
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               "Q"  # p_align
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           )
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+def int128_get64(val):
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+    assert (val["hi"] == 0)
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+    return val["lo"]
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+
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+def qtailq_foreach(head, field_str):
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+    var_p = head["tqh_first"]
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+    while (var_p != 0):
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+        var = var_p.dereference()
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+        yield var
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+        var_p = var[field_str]["tqe_next"]
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+
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+def qemu_get_ram_block(ram_addr):
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+    ram_blocks = gdb.parse_and_eval("ram_list.blocks")
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+    for block in qtailq_foreach(ram_blocks, "next"):
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+        if (ram_addr - block["offset"] < block["length"]):
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+            return block
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+    raise gdb.GdbError("Bad ram offset %x" % ram_addr)
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+
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+def qemu_get_ram_ptr(ram_addr):
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+    block = qemu_get_ram_block(ram_addr)
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+    return block["host"] + (ram_addr - block["offset"])
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+
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+def memory_region_get_ram_ptr(mr):
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+    if (mr["alias"] != 0):
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+        return (memory_region_get_ram_ptr(mr["alias"].dereference()) +
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+                mr["alias_offset"])
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+    return qemu_get_ram_ptr(mr["ram_addr"] & TARGET_PAGE_MASK)
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+
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+def get_guest_phys_blocks():
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+    guest_phys_blocks = []
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+    print "guest RAM blocks:"
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+    print ("target_start     target_end       host_addr        message "
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+           "count")
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+    print ("---------------- ---------------- ---------------- ------- "
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+           "-----")
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+
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+    current_map_p = gdb.parse_and_eval("address_space_memory.current_map")
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+    current_map = current_map_p.dereference()
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+    for cur in range(current_map["nr"]):
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+        flat_range   = (current_map["ranges"] + cur).dereference()
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+        mr           = flat_range["mr"].dereference()
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+
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+        # we only care about RAM
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+        if (not mr["ram"]):
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+            continue
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+
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+        section_size = int128_get64(flat_range["addr"]["size"])
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+        target_start = int128_get64(flat_range["addr"]["start"])
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+        target_end   = target_start + section_size
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+        host_addr    = (memory_region_get_ram_ptr(mr) +
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+                        flat_range["offset_in_region"])
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+        predecessor = None
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+
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+        # find continuity in guest physical address space
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+        if (len(guest_phys_blocks) > 0):
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+            predecessor = guest_phys_blocks[-1]
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+            predecessor_size = (predecessor["target_end"] -
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+                                predecessor["target_start"])
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+
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+            # the memory API guarantees monotonically increasing
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+            # traversal
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+            assert (predecessor["target_end"] <= target_start)
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+
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+            # we want continuity in both guest-physical and
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+            # host-virtual memory
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+            if (predecessor["target_end"] < target_start or
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+                predecessor["host_addr"] + predecessor_size != host_addr):
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+                predecessor = None
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+
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+        if (predecessor is None):
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+            # isolated mapping, add it to the list
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+            guest_phys_blocks.append({"target_start": target_start,
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+                                      "target_end"  : target_end,
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+                                      "host_addr"   : host_addr})
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+            message = "added"
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+        else:
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+            # expand predecessor until @target_end; predecessor's
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+            # start doesn't change
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+            predecessor["target_end"] = target_end
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+            message = "joined"
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+
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+        print ("%016x %016x %016x %-7s %5u" %
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+               (target_start, target_end, host_addr.cast(UINTPTR_T),
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+                message, len(guest_phys_blocks)))
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+
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+    return guest_phys_blocks
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+
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+
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 class DumpGuestMemory(gdb.Command):
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     """Extract guest vmcore from qemu process coredump.
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@@ -100,96 +190,9 @@ shape and this command should mostly work."""
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         super(DumpGuestMemory, self).__init__("dump-guest-memory",
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                                               gdb.COMMAND_DATA,
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                                               gdb.COMPLETE_FILENAME)
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-        self.uintptr_t     = gdb.lookup_type("uintptr_t")
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         self.elf64_ehdr_le = struct.Struct("<%s" % ELF64_EHDR)
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         self.elf64_phdr_le = struct.Struct("<%s" % ELF64_PHDR)
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-
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-    def int128_get64(self, val):
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-        assert (val["hi"] == 0)
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-        return val["lo"]
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-
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-    def qtailq_foreach(self, head, field_str):
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-        var_p = head["tqh_first"]
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-        while (var_p != 0):
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-            var = var_p.dereference()
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-            yield var
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-            var_p = var[field_str]["tqe_next"]
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-
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-    def qemu_get_ram_block(self, ram_addr):
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-        ram_blocks = gdb.parse_and_eval("ram_list.blocks")
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-        for block in self.qtailq_foreach(ram_blocks, "next"):
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-            if (ram_addr - block["offset"] < block["length"]):
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-                return block
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-        raise gdb.GdbError("Bad ram offset %x" % ram_addr)
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-
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-    def qemu_get_ram_ptr(self, ram_addr):
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-        block = self.qemu_get_ram_block(ram_addr)
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-        return block["host"] + (ram_addr - block["offset"])
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-
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-    def memory_region_get_ram_ptr(self, mr):
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-        if (mr["alias"] != 0):
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-            return (self.memory_region_get_ram_ptr(mr["alias"].dereference()) +
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-                    mr["alias_offset"])
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-        return self.qemu_get_ram_ptr(mr["ram_addr"] & TARGET_PAGE_MASK)
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-
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-    def guest_phys_blocks_init(self):
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-        self.guest_phys_blocks = []
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-
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-    def guest_phys_blocks_append(self):
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-        print "guest RAM blocks:"
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-        print ("target_start     target_end       host_addr        message "
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-               "count")
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-        print ("---------------- ---------------- ---------------- ------- "
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-               "-----")
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-
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-        current_map_p = gdb.parse_and_eval("address_space_memory.current_map")
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-        current_map = current_map_p.dereference()
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-        for cur in range(current_map["nr"]):
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-            flat_range   = (current_map["ranges"] + cur).dereference()
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-            mr           = flat_range["mr"].dereference()
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-
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-            # we only care about RAM
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-            if (not mr["ram"]):
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-                continue
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-
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-            section_size = self.int128_get64(flat_range["addr"]["size"])
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-            target_start = self.int128_get64(flat_range["addr"]["start"])
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-            target_end   = target_start + section_size
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-            host_addr    = (self.memory_region_get_ram_ptr(mr) +
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-                            flat_range["offset_in_region"])
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-            predecessor = None
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-
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-            # find continuity in guest physical address space
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-            if (len(self.guest_phys_blocks) > 0):
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-                predecessor = self.guest_phys_blocks[-1]
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-                predecessor_size = (predecessor["target_end"] -
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-                                    predecessor["target_start"])
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-
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-                # the memory API guarantees monotonically increasing
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-                # traversal
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-                assert (predecessor["target_end"] <= target_start)
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-
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-                # we want continuity in both guest-physical and
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-                # host-virtual memory
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-                if (predecessor["target_end"] < target_start or
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-                    predecessor["host_addr"] + predecessor_size != host_addr):
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-                    predecessor = None
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-
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-            if (predecessor is None):
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-                # isolated mapping, add it to the list
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-                self.guest_phys_blocks.append({"target_start": target_start,
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-                                               "target_end"  : target_end,
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-                                               "host_addr"   : host_addr})
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-                message = "added"
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-            else:
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-                # expand predecessor until @target_end; predecessor's
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-                # start doesn't change
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-                predecessor["target_end"] = target_end
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-                message = "joined"
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-
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-            print ("%016x %016x %016x %-7s %5u" %
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-                   (target_start, target_end, host_addr.cast(self.uintptr_t),
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-                    message, len(self.guest_phys_blocks)))
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+        self.guest_phys_blocks = None
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     def cpu_get_dump_info(self):
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         # We can't synchronize the registers with KVM post-mortem, and
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@@ -263,8 +266,7 @@ shape and this command should mostly work."""
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                                 len(name) + 1, len(desc), type, name, desc)
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     def dump_init(self):
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-        self.guest_phys_blocks_init()
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-        self.guest_phys_blocks_append()
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+        self.guest_phys_blocks = get_guest_phys_blocks()
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         self.cpu_get_dump_info()
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         # we have no way to retrieve the VCPU status from KVM
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         # post-mortem
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@@ -310,7 +312,7 @@ shape and this command should mostly work."""
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             cur  = block["host_addr"]
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             left = block["target_end"] - block["target_start"]
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             print ("dumping range at %016x for length %016x" %
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-                   (cur.cast(self.uintptr_t), left))
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+                   (cur.cast(UINTPTR_T), left))
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             while (left > 0):
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                 chunk_size = min(TARGET_PAGE_SIZE, left)
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                 chunk = qemu_core.read_memory(cur, chunk_size)
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-- 
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1.8.3.1
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