commit 44a4ff31c01082ffce08ec3b9a87a4fdf15919d5
author Jagannathan Raman <jag.raman@oracle.com> Fri Jan 29 11:46:04 2021 -0500
committer Stefan Hajnoczi <stefanha@redhat.com> Tue Feb 09 20:53:56 2021 +0000
tree 12d221ae0ba47bf3a853248b3b42bae208a07c6b
parent 639090d85057e7e8251e2509fa136f1a2384f131

memory: alloc RAM from file at offset

Allow RAM MemoryRegion to be created from an offset in a file, instead
of allocating at offset of 0 by default. This is needed to synchronize
RAM between QEMU & remote process.

Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 609996697ad8617e3b01df38accc5c208c24d74e.1611938319.git.jag.raman@oracle.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

softmmu/memory.c

diff --git a/softmmu/memory.c b/softmmu/memory.c
index 23e8e33..874a8fc 100644
--- a/softmmu/memory.c
+++ b/softmmu/memory.c
@@ -1612,6 +1612,7 @@
                                     uint64_t size,
                                     bool share,
                                     int fd,
+                                    ram_addr_t offset,
                                     Error **errp)
 {
     Error *err = NULL;
@@ -1621,7 +1622,7 @@
     mr->destructor = memory_region_destructor_ram;
     mr->ram_block = qemu_ram_alloc_from_fd(size, mr,
                                            share ? RAM_SHARED : 0,
-                                           fd, false, &err);
+                                           fd, offset, false, &err);
     if (err) {
         mr->size = int128_zero();
         object_unparent(OBJECT(mr));