system: Declare qemu_[min/max]rampagesize() in 'system/hostmem.h'

Both qemu_minrampagesize() and qemu_maxrampagesize() are
related to host memory backends, having the following call
stack:

  qemu_minrampagesize()
     -> find_min_backend_pagesize()
         -> object_dynamic_cast(obj, TYPE_MEMORY_BACKEND)

  qemu_maxrampagesize()
     -> find_max_backend_pagesize()
        -> object_dynamic_cast(obj, TYPE_MEMORY_BACKEND)

Having TYPE_MEMORY_BACKEND defined in "system/hostmem.h":

  include/system/hostmem.h:23:#define TYPE_MEMORY_BACKEND "memory-backend"

Move their prototype declaration to "system/hostmem.h".

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Message-Id: <20250308230917.18907-7-philmd@linaro.org>
Acked-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250311085743.21724-2-philmd@linaro.org
Signed-off-by: Cédric Le Goater <clg@redhat.com>

hw/ppc/spapr_caps.c

@@ -34,6 +34,7 @@
 #include "kvm_ppc.h"
 #include "migration/vmstate.h"
 #include "system/tcg.h"
+#include "system/hostmem.h"
 
 #include "hw/ppc/spapr.h"
 

hw/s390x/s390-virtio-ccw.c

@@ -41,6 +41,7 @@
 #include "hw/s390x/tod.h"
 #include "system/system.h"
 #include "system/cpus.h"
+#include "system/hostmem.h"
 #include "target/s390x/kvm/pv.h"
 #include "migration/blocker.h"
 #include "qapi/visitor.h"

hw/vfio/spapr.c

@@ -15,6 +15,7 @@
 #include <linux/kvm.h>
 #endif
 #include "system/kvm.h"
+#include "system/hostmem.h"
 #include "exec/address-spaces.h"
 
 #include "hw/vfio/vfio-common.h"

include/exec/ram_addr.h

@@ -102,9 +102,6 @@ static inline unsigned long int ramblock_recv_bitmap_offset(void *host_addr,
 
 bool ramblock_is_pmem(RAMBlock *rb);
 
-long qemu_minrampagesize(void);
-long qemu_maxrampagesize(void);
-
 /**
  * qemu_ram_alloc_from_file,
  * qemu_ram_alloc_from_fd:  Allocate a ram block from the specified backing

include/system/hostmem.h

@@ -93,4 +93,7 @@ bool host_memory_backend_is_mapped(HostMemoryBackend *backend);
 size_t host_memory_backend_pagesize(HostMemoryBackend *memdev);
 char *host_memory_backend_get_name(HostMemoryBackend *backend);
 
+long qemu_minrampagesize(void);
+long qemu_maxrampagesize(void);
+
 #endif