pc-dimm: factor out capacity and slot checks into MemoryDevice

Move the checks into memory_device_get_free_addr(). This will check
before doing any calculations if we have KVM/vhost slots left and if
the total region size would be exceeded.

Of course, while at it, make it independent of pc-dimm code.

Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20180423165126.15441-7-david@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

1 files changed, 0 insertions, 60 deletions

diff --git a/hw/mem/pc-dimm.c b/hw/mem/pc-dimm.c
index 9b70174fd9..8aa2d36ce9 100644
--- a/hw/mem/pc-dimm.c
+++ b/hw/mem/pc-dimm.c
@@ -25,9 +25,7 @@
 #include "qapi/error.h"
 #include "qapi/visitor.h"
 #include "sysemu/numa.h"
-#include "sysemu/kvm.h"
 #include "trace.h"
-#include "hw/virtio/vhost.h"
 
 typedef struct pc_dimms_capacity {
      uint64_t size;
@@ -43,7 +41,6 @@ void pc_dimm_memory_plug(DeviceState *dev, MachineState *machine,
     PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm);
     MemoryRegion *vmstate_mr = ddc->get_vmstate_memory_region(dimm);
     Error *local_err = NULL;
-    uint64_t existing_dimms_capacity = 0;
     MemoryRegion *mr;
     uint64_t addr;
 
@@ -64,20 +61,6 @@ void pc_dimm_memory_plug(DeviceState *dev, MachineState *machine,
         goto out;
     }
 
-    existing_dimms_capacity = pc_existing_dimms_capacity(&local_err);
-    if (local_err) {
-        goto out;
-    }
-
-    if (existing_dimms_capacity + memory_region_size(mr) >
-        machine->maxram_size - machine->ram_size) {
-        error_setg(&local_err, "not enough space, currently 0x%" PRIx64
-                   " in use of total hot pluggable 0x" RAM_ADDR_FMT,
-                   existing_dimms_capacity,
-                   machine->maxram_size - machine->ram_size);
-        goto out;
-    }
-
     object_property_set_uint(OBJECT(dev), addr, PC_DIMM_ADDR_PROP, &local_err);
     if (local_err) {
         goto out;
@@ -100,17 +83,6 @@ void pc_dimm_memory_plug(DeviceState *dev, MachineState *machine,
     }
     trace_mhp_pc_dimm_assigned_slot(slot);
 
-    if (kvm_enabled() && !kvm_has_free_slot(machine)) {
-        error_setg(&local_err, "hypervisor has no free memory slots left");
-        goto out;
-    }
-
-    if (!vhost_has_free_slot()) {
-        error_setg(&local_err, "a used vhost backend has no free"
-                               " memory slots left");
-        goto out;
-    }
-
     memory_region_add_subregion(&hpms->mr, addr - hpms->base, mr);
     vmstate_register_ram(vmstate_mr, dev);
 
@@ -129,38 +101,6 @@ void pc_dimm_memory_unplug(DeviceState *dev, MachineState *machine)
     vmstate_unregister_ram(vmstate_mr, dev);
 }
 
-static int pc_existing_dimms_capacity_internal(Object *obj, void *opaque)
-{
-    pc_dimms_capacity *cap = opaque;
-    uint64_t *size = &cap->size;
-
-    if (object_dynamic_cast(obj, TYPE_PC_DIMM)) {
-        DeviceState *dev = DEVICE(obj);
-
-        if (dev->realized) {
-            (*size) += object_property_get_uint(obj, PC_DIMM_SIZE_PROP,
-                cap->errp);
-        }
-
-        if (cap->errp && *cap->errp) {
-            return 1;
-        }
-    }
-    object_child_foreach(obj, pc_existing_dimms_capacity_internal, opaque);
-    return 0;
-}
-
-uint64_t pc_existing_dimms_capacity(Error **errp)
-{
-    pc_dimms_capacity cap;
-
-    cap.size = 0;
-    cap.errp = errp;
-
-    pc_existing_dimms_capacity_internal(qdev_get_machine(), &cap);
-    return cap.size;
-}
-
 static int pc_dimm_slot2bitmap(Object *obj, void *opaque)
 {
     unsigned long *bitmap = opaque;