If option 'reserved-size=RSVD' is present, QEMU will reserve an
address range of size 'RSVD' after the ending address of pc-dimm
device.
For the following example,
-object memory-backend-file,id=mem0,size=4G,...
-device nvdimm,id=dimm0,memdev=mem0,reserved-size=4K,...
-device pc-dimm,id=dimm1,...
if dimm0 is allocated to address N ~ N+4G, the address range of
dimm1 will start from N+4G+4K or higher.
Its current usage is to reserve spaces for flush hint addresses
of nvdimm devices.
Signed-off-by: Haozhong Zhang <address@hidden>
---
hw/mem/pc-dimm.c | 48 +++++++++++++++++++++++++++++++++++++++++++++---
include/hw/mem/pc-dimm.h | 2 ++
2 files changed, 47 insertions(+), 3 deletions(-)
diff --git a/hw/mem/pc-dimm.c b/hw/mem/pc-dimm.c
index 9e8dab0..13dcd71 100644
--- a/hw/mem/pc-dimm.c
+++ b/hw/mem/pc-dimm.c
@@ -28,6 +28,7 @@
#include "sysemu/kvm.h"
#include "trace.h"
#include "hw/virtio/vhost.h"
+#include "exec/address-spaces.h"
typedef struct pc_dimms_capacity {
uint64_t size;
@@ -44,7 +45,12 @@ void pc_dimm_memory_plug(DeviceState *dev,
MemoryHotplugState *hpms,
MemoryRegion *vmstate_mr = ddc->get_vmstate_memory_region(dimm);
Error *local_err = NULL;
uint64_t existing_dimms_capacity = 0;
- uint64_t addr;
+ uint64_t addr, size = memory_region_size(mr);
+
+ size += object_property_get_int(OBJECT(dimm), PC_DIMM_RSVD_PROP,
&local_err);
+ if (local_err) {
+ goto out;
+ }
addr = object_property_get_int(OBJECT(dimm), PC_DIMM_ADDR_PROP,
&local_err);
if (local_err) {
@@ -54,7 +60,7 @@ void pc_dimm_memory_plug(DeviceState *dev, MemoryHotplugState
*hpms,
addr = pc_dimm_get_free_addr(hpms->base,
memory_region_size(&hpms->mr),
!addr ? NULL : &addr, align,
- memory_region_size(mr), &local_err);
+ size, &local_err);
if (local_err) {
goto out;
}
@@ -64,7 +70,7 @@ void pc_dimm_memory_plug(DeviceState *dev, MemoryHotplugState
*hpms,
goto out;
}
- if (existing_dimms_capacity + memory_region_size(mr) >
+ if (existing_dimms_capacity + size >
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,
@@ -315,6 +321,9 @@ uint64_t pc_dimm_get_free_addr(uint64_t address_space_start,
PCDIMMDevice *dimm = item->data;
uint64_t dimm_size = object_property_get_int(OBJECT(dimm),
PC_DIMM_SIZE_PROP,
+ errp) +
+ object_property_get_int(OBJECT(dimm),
+ PC_DIMM_RSVD_PROP,
errp);
if (errp && *errp) {
goto out;
@@ -382,6 +391,37 @@ static void pc_dimm_check_memdev_is_busy(Object *obj,
const char *name,
error_propagate(errp, local_err);
}