Add qemu_ram_remap

qemu_ram_remap() unmaps the specified RAM pages, then re-maps these
pages again.  This is used by KVM HWPoison support to clear HWPoisoned
page tables across guest rebooting, so that a new page may be
allocated later to recover the memory error.

[ Jan: style fixlets, WIN32 fix ]

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/cpu-all.h b/cpu-all.h
index caf5e6c..4f4631d 100644
--- a/cpu-all.h
+++ b/cpu-all.h
@@ -863,10 +863,14 @@
 extern int phys_ram_fd;
 extern ram_addr_t ram_size;
 
+/* RAM is pre-allocated and passed into qemu_ram_alloc_from_ptr */
+#define RAM_PREALLOC_MASK   (1 << 0)
+
 typedef struct RAMBlock {
     uint8_t *host;
     ram_addr_t offset;
     ram_addr_t length;
+    uint32_t flags;
     char idstr[256];
     QLIST_ENTRY(RAMBlock) next;
 #if defined(__linux__) && !defined(TARGET_S390X)