Re: [Qemu-devel] [PATCH v2 07/18] nvdimm: reserve address range for NVDIMM

[Stefan Hajnoczi <stefanha@gmail.com>]

On Fri, Aug 14, 2015 at 10:52:00PM +0800, Xiao Guangrong wrote:
> NVDIMM reserves all the free range above 4G to do:
> - Persistent Memory (PMEM) mapping
> - implement NVDIMM ACPI device _DSM method
> 
> Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
> ---
>  hw/i386/pc.c               | 12 ++++++++++--
>  hw/mem/nvdimm/pc-nvdimm.c  | 13 +++++++++++++
>  include/hw/mem/pc-nvdimm.h |  1 +
>  3 files changed, 24 insertions(+), 2 deletions(-)

CCing Igor for memory hotplug-related changes.

> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index 7661ea9..41af6ea 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -64,6 +64,7 @@
>  #include "hw/pci/pci_host.h"
>  #include "acpi-build.h"
>  #include "hw/mem/pc-dimm.h"
> +#include "hw/mem/pc-nvdimm.h"
>  #include "qapi/visitor.h"
>  #include "qapi-visit.h"
>  
> @@ -1302,6 +1303,7 @@ FWCfgState *pc_memory_init(MachineState *machine,
>      MemoryRegion *ram_below_4g, *ram_above_4g;
>      FWCfgState *fw_cfg;
>      PCMachineState *pcms = PC_MACHINE(machine);
> +    ram_addr_t offset;
>  
>      assert(machine->ram_size == below_4g_mem_size + above_4g_mem_size);
>  
> @@ -1339,6 +1341,8 @@ FWCfgState *pc_memory_init(MachineState *machine,
>          exit(EXIT_FAILURE);
>      }
>  
> +    offset = 0x100000000ULL + above_4g_mem_size;
> +
>      /* initialize hotplug memory address space */
>      if (guest_info->has_reserved_memory &&
>          (machine->ram_size < machine->maxram_size)) {
> @@ -1358,8 +1362,7 @@ FWCfgState *pc_memory_init(MachineState *machine,
>              exit(EXIT_FAILURE);
>          }
>  
> -        pcms->hotplug_memory.base =
> -            ROUND_UP(0x100000000ULL + above_4g_mem_size, 1ULL << 30);
> +        pcms->hotplug_memory.base = ROUND_UP(offset, 1ULL << 30);
>  
>          if (pcms->enforce_aligned_dimm) {
>              /* size hotplug region assuming 1G page max alignment per slot */
> @@ -1377,8 +1380,13 @@ FWCfgState *pc_memory_init(MachineState *machine,
>                             "hotplug-memory", hotplug_mem_size);
>          memory_region_add_subregion(system_memory, pcms->hotplug_memory.base,
>                                      &pcms->hotplug_memory.mr);
> +
> +        offset = pcms->hotplug_memory.base + hotplug_mem_size;
>      }
>  
> +     /* all the space left above 4G is reserved for NVDIMM. */
> +    pc_nvdimm_reserve_range(offset);
> +
>      /* Initialize PC system firmware */
>      pc_system_firmware_init(rom_memory, guest_info->isapc_ram_fw);
>  
> diff --git a/hw/mem/nvdimm/pc-nvdimm.c b/hw/mem/nvdimm/pc-nvdimm.c
> index a53d235..7a270a8 100644
> --- a/hw/mem/nvdimm/pc-nvdimm.c
> +++ b/hw/mem/nvdimm/pc-nvdimm.c
> @@ -24,6 +24,19 @@
>  
>  #include "hw/mem/pc-nvdimm.h"
>  
> +#define PAGE_SIZE      (1UL << 12)
> +
> +static struct nvdimms_info {
> +    ram_addr_t current_addr;
> +} nvdimms_info;
> +
> +/* the address range [offset, ~0ULL) is reserved for NVDIMM. */
> +void pc_nvdimm_reserve_range(ram_addr_t offset)
> +{
> +    offset = ROUND_UP(offset, PAGE_SIZE);
> +    nvdimms_info.current_addr = offset;
> +}
> +
>  static char *get_file(Object *obj, Error **errp)
>  {
>      PCNVDIMMDevice *nvdimm = PC_NVDIMM(obj);
> diff --git a/include/hw/mem/pc-nvdimm.h b/include/hw/mem/pc-nvdimm.h
> index 51152b8..8601e9b 100644
> --- a/include/hw/mem/pc-nvdimm.h
> +++ b/include/hw/mem/pc-nvdimm.h
> @@ -28,4 +28,5 @@ typedef struct PCNVDIMMDevice {
>  #define PC_NVDIMM(obj) \
>      OBJECT_CHECK(PCNVDIMMDevice, (obj), TYPE_PC_NVDIMM)
>  
> +void pc_nvdimm_reserve_range(ram_addr_t offset);
>  #endif
> -- 
> 2.4.3
> 
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