numa: drop support for '-numa node' (without memory specified)

it was deprecated since 4.1
commit 4bb4a2732e (numa: deprecate implict memory distribution between nodes)

Users of existing VMs, wishing to preserve the same RAM distribution,
should configure it explicitly using ``-numa node,memdev`` options.
Current RAM distribution can be retrieved using HMP command
`info numa` and if separate memory devices (pc|nv-dimm) are present
use `info memory-device` and subtract device memory from output of
`info numa`.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20200911084410.788171-2-imammedo@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/docs/system/deprecated.rst b/docs/system/deprecated.rst
index 5326141cee38ed1c81d5edaafac253be2538b502..827482a8f750059b7cac9dc409c26abbbb35b5af 100644 (file)
--- a/docs/system/deprecated.rst
+++ b/docs/system/deprecated.rst
@@ -92,15 +92,6 @@ error in the future.
 The ``-realtime mlock=on|off`` argument has been replaced by the
 ``-overcommit mem-lock=on|off`` argument.
 
-``-numa`` node (without memory specified) (since 4.1)
-'''''''''''''''''''''''''''''''''''''''''''''''''''''
-
-Splitting RAM by default between NUMA nodes has the same issues as ``mem``
-parameter described above with the difference that the role of the user plays
-QEMU using implicit generic or board specific splitting rule.
-Use ``memdev`` with *memory-backend-ram* backend or ``mem`` (if
-it's supported by used machine type) to define mapping explicitly instead.
-
 ``-mem-path`` fallback to RAM (since 4.1)
 '''''''''''''''''''''''''''''''''''''''''
 
@@ -612,6 +603,20 @@ error when ``-u`` is not used.
 Command line options
 --------------------
 
+``-numa`` node (without memory specified) (removed 5.2)
+'''''''''''''''''''''''''''''''''''''''''''''''''''''''
+
+Splitting RAM by default between NUMA nodes had the same issues as ``mem``
+parameter with the difference that the role of the user plays QEMU using
+implicit generic or board specific splitting rule.
+Use ``memdev`` with *memory-backend-ram* backend or ``mem`` (if
+it's supported by used machine type) to define mapping explictly instead.
+Users of existing VMs, wishing to preserve the same RAM distribution, should
+configure it explicitly using ``-numa node,memdev`` options. Current RAM
+distribution can be retrieved using HMP command ``info numa`` and if separate
+memory devices (pc|nv-dimm) are present use ``info memory-device`` and subtract
+device memory from output of ``info numa``.
+
 ``-numa node,mem=``\ *size* (removed in 5.1)
 ''''''''''''''''''''''''''''''''''''''''''''
 

diff --git a/hw/core/machine.c b/hw/core/machine.c
index d7f4a0d259825eb486cc4994ee3e9b109c4814e8..7e2f4ec08e01ac435d6ab364a20546bf9505ed21 100644 (file)
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -790,7 +790,6 @@ static void machine_class_init(ObjectClass *oc, void *data)
      * On Linux, each node's border has to be 8MB aligned
      */
     mc->numa_mem_align_shift = 23;
-    mc->numa_auto_assign_ram = numa_default_auto_assign_ram;
 
     object_class_property_add_str(oc, "kernel",
         machine_get_kernel, machine_set_kernel);

diff --git a/hw/core/numa.c b/hw/core/numa.c
index f9593ec716702ea1ebb28a2ea3bc04c08a14a095..706c1e84c6344a82feeb4590373af27b35e8afcd 100644 (file)
--- a/hw/core/numa.c
+++ b/hw/core/numa.c
@@ -611,42 +611,6 @@ static void complete_init_numa_distance(MachineState *ms)
     }
 }
 
-void numa_legacy_auto_assign_ram(MachineClass *mc, NodeInfo *nodes,
-                                 int nb_nodes, ram_addr_t size)
-{
-    int i;
-    uint64_t usedmem = 0;
-
-    /* Align each node according to the alignment
-     * requirements of the machine class
-     */
-
-    for (i = 0; i < nb_nodes - 1; i++) {
-        nodes[i].node_mem = (size / nb_nodes) &
-                            ~((1 << mc->numa_mem_align_shift) - 1);
-        usedmem += nodes[i].node_mem;
-    }
-    nodes[i].node_mem = size - usedmem;
-}
-
-void numa_default_auto_assign_ram(MachineClass *mc, NodeInfo *nodes,
-                                  int nb_nodes, ram_addr_t size)
-{
-    int i;
-    uint64_t usedmem = 0, node_mem;
-    uint64_t granularity = size / nb_nodes;
-    uint64_t propagate = 0;
-
-    for (i = 0; i < nb_nodes - 1; i++) {
-        node_mem = (granularity + propagate) &
-                   ~((1 << mc->numa_mem_align_shift) - 1);
-        propagate = granularity + propagate - node_mem;
-        nodes[i].node_mem = node_mem;
-        usedmem += node_mem;
-    }
-    nodes[i].node_mem = size - usedmem;
-}
-
 static void numa_init_memdev_container(MachineState *ms, MemoryRegion *ram)
 {
     int i;
@@ -717,25 +681,6 @@ void numa_complete_configuration(MachineState *ms)
             ms->numa_state->num_nodes = MAX_NODES;
         }
 
-        /* If no memory size is given for any node, assume the default case
-         * and distribute the available memory equally across all nodes
-         */
-        for (i = 0; i < ms->numa_state->num_nodes; i++) {
-            if (numa_info[i].node_mem != 0) {
-                break;
-            }
-        }
-        if (i == ms->numa_state->num_nodes) {
-            assert(mc->numa_auto_assign_ram);
-            mc->numa_auto_assign_ram(mc, numa_info,
-                                     ms->numa_state->num_nodes, ram_size);
-            if (!qtest_enabled()) {
-                warn_report("Default splitting of RAM between nodes is deprecated,"
-                            " Use '-numa node,memdev' to explictly define RAM"
-                            " allocation per node");
-            }
-        }
-
         numa_total = 0;
         for (i = 0; i < ms->numa_state->num_nodes; i++) {
             numa_total += numa_info[i].node_mem;

diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 2d8413a0ce7b4b82483cc9959ee6715c2fe817fd..32c5d957625244bf43785e860850f0445f4537af 100644 (file)
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -565,7 +565,6 @@ static void pc_i440fx_2_9_machine_options(MachineClass *m)
     pc_i440fx_2_10_machine_options(m);
     compat_props_add(m->compat_props, hw_compat_2_9, hw_compat_2_9_len);
     compat_props_add(m->compat_props, pc_compat_2_9, pc_compat_2_9_len);
-    m->numa_auto_assign_ram = numa_legacy_auto_assign_ram;
 }
 
 DEFINE_I440FX_MACHINE(v2_9, "pc-i440fx-2.9", NULL,

diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index e1c415f57d7b9a6f21a4554160378fe416ebda96..e14d1446beff92d25ec18021dbb6ab9bb834d875 100644 (file)
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -494,7 +494,6 @@ static void pc_q35_2_10_machine_options(MachineClass *m)
     pc_q35_2_11_machine_options(m);
     compat_props_add(m->compat_props, hw_compat_2_10, hw_compat_2_10_len);
     compat_props_add(m->compat_props, pc_compat_2_10, pc_compat_2_10_len);
-    m->numa_auto_assign_ram = numa_legacy_auto_assign_ram;
     m->auto_enable_numa_with_memhp = false;
 }
 

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index cbcd93b406a54023f3343b459c946413bc06549b..2db810f73ab0f071047357db357911f813e54c38 100644 (file)
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -4734,7 +4734,6 @@ static void spapr_machine_2_9_class_options(MachineClass *mc)
     spapr_machine_2_10_class_options(mc);
     compat_props_add(mc->compat_props, hw_compat_2_9, hw_compat_2_9_len);
     compat_props_add(mc->compat_props, compat, G_N_ELEMENTS(compat));
-    mc->numa_auto_assign_ram = numa_legacy_auto_assign_ram;
     smc->pre_2_10_has_unused_icps = true;
     smc->resize_hpt_default = SPAPR_RESIZE_HPT_DISABLED;
 }

diff --git a/include/hw/boards.h b/include/hw/boards.h
index 482d2833f62073e1d6229a8a9aa2f9ad78e4b186..bf53e8a16e01ed692deae79b1eab472ffed16663 100644 (file)
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -202,8 +202,6 @@ struct MachineClass {
     strList *allowed_dynamic_sysbus_devices;
     bool auto_enable_numa_with_memhp;
     bool auto_enable_numa_with_memdev;
-    void (*numa_auto_assign_ram)(MachineClass *mc, NodeInfo *nodes,
-                                 int nb_nodes, ram_addr_t size);
     bool ignore_boot_device_suffixes;
     bool smbus_no_migration_support;
     bool nvdimm_supported;

diff --git a/include/sysemu/numa.h b/include/sysemu/numa.h
index ad58ee88f7c42b2ffe8cc4125f220eb616d8d27f..4173ef2afa75baba7cb2f03f861a1edc6f78bc87 100644 (file)
--- a/include/sysemu/numa.h
+++ b/include/sysemu/numa.h
@@ -106,10 +106,6 @@ void parse_numa_hmat_cache(MachineState *ms, NumaHmatCacheOptions *node,
 void numa_complete_configuration(MachineState *ms);
 void query_numa_node_mem(NumaNodeMem node_mem[], MachineState *ms);
 extern QemuOptsList qemu_numa_opts;
-void numa_legacy_auto_assign_ram(MachineClass *mc, NodeInfo *nodes,
-                                 int nb_nodes, ram_addr_t size);
-void numa_default_auto_assign_ram(MachineClass *mc, NodeInfo *nodes,
-                                  int nb_nodes, ram_addr_t size);
 void numa_cpu_pre_plug(const struct CPUArchId *slot, DeviceState *dev,
                        Error **errp);
 bool numa_uses_legacy_mem(void);