[v4,12/24] memory-device: add device class function set_addr()

To be able to factor out address asignment of memory devices, we will
have to read (get_addr()) and write (set_addr()) the address.

We can't use properties for this purpose, as properties are device
specific. E.g. while the address property for a DIMM is called "addr", it
might be called differently (e.g. "memaddr") for other devices.

Especially virtio based memory devices cannot use "addr" as that is already
reserved and used for the address on the bus (for the proxy device).

Also, it might be possible to have memory devices without address
properties (e.g. internal DIMM-like thingies).

In contrast to get_addr(), we expect that set_addr() can fail.

Keep it simple for now for pc-dimm and simply set the static property, that
will fail once realized.

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
 hw/mem/pc-dimm.c               | 7 +++++++
 include/hw/mem/memory-device.h | 2 ++
 2 files changed, 9 insertions(+)

Hi David,

On 9/26/18 11:42 AM, David Hildenbrand wrote:
> To be able to factor out address asignment of memory devices, we will
s/asignment/assignment
> have to read (get_addr()) and write (set_addr()) the address.
> 
> We can't use properties for this purpose, as properties are device
> specific. E.g. while the address property for a DIMM is called "addr", it
> might be called differently (e.g. "memaddr") for other devices.
> 
> Especially virtio based memory devices cannot use "addr" as that is already
> reserved and used for the address on the bus (for the proxy device).
> 
> Also, it might be possible to have memory devices without address
> properties (e.g. internal DIMM-like thingies).
> 
> In contrast to get_addr(), we expect that set_addr() can fail.
> 
> Keep it simple for now for pc-dimm and simply set the static property, that
> will fail once realized.
> 
> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
> Reviewed-by: Igor Mammedov <imammedo@redhat.com>
> Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>

Thanks

Eric
> ---
>  hw/mem/pc-dimm.c               | 7 +++++++
>  include/hw/mem/memory-device.h | 2 ++
>  2 files changed, 9 insertions(+)
> 
> diff --git a/hw/mem/pc-dimm.c b/hw/mem/pc-dimm.c
> index 4bd8c496bb..5873172175 100644
> --- a/hw/mem/pc-dimm.c
> +++ b/hw/mem/pc-dimm.c
> @@ -236,6 +236,12 @@ static uint64_t pc_dimm_md_get_addr(const MemoryDeviceState *md)
>      return dimm->addr;
>  }
>  
> +static void pc_dimm_md_set_addr(MemoryDeviceState *md, uint64_t addr,
> +                                Error **errp)
> +{
> +    object_property_set_uint(OBJECT(md), addr, PC_DIMM_ADDR_PROP, errp);
> +}
> +
>  static MemoryRegion *pc_dimm_md_get_memory_region(MemoryDeviceState *md,
>                                                    Error **errp)
>  {
> @@ -286,6 +292,7 @@ static void pc_dimm_class_init(ObjectClass *oc, void *data)
>      ddc->get_vmstate_memory_region = pc_dimm_get_memory_region;
>  
>      mdc->get_addr = pc_dimm_md_get_addr;
> +    mdc->set_addr = pc_dimm_md_set_addr;
>      /* for a dimm plugged_size == region_size */
>      mdc->get_plugged_size = memory_device_get_region_size;
>      mdc->get_memory_region = pc_dimm_md_get_memory_region;
> diff --git a/include/hw/mem/memory-device.h b/include/hw/mem/memory-device.h
> index 642797655f..6395942b27 100644
> --- a/include/hw/mem/memory-device.h
> +++ b/include/hw/mem/memory-device.h
> @@ -34,6 +34,7 @@ typedef struct MemoryDeviceState {
>   * @get_addr: The address of the @md in guest physical memory. "0" means that
>   * no address has been specified by the user and that no address has been
>   * assigned yet.
> + * @set_addr: Set the address of the @md in guest physical memory.
>   * @get_plugged_size: The amount of memory provided by this @md currently
>   * usable ("plugged") by the guest. This is helpful for devices that
>   * dynamically manage the amount of memory accessible by the guest via
> @@ -51,6 +52,7 @@ typedef struct MemoryDeviceClass {
>  
>      /* public */
>      uint64_t (*get_addr)(const MemoryDeviceState *md);
> +    void (*set_addr)(MemoryDeviceState *md, uint64_t addr, Error **errp);
>      uint64_t (*get_plugged_size)(const MemoryDeviceState *md, Error **errp);
>      MemoryRegion *(*get_memory_region)(MemoryDeviceState *md, Error **errp);
>      void (*fill_device_info)(const MemoryDeviceState *md,
>