[PATCH v1 01/15] libvhost-user: Fix msg_region->userspace_addr computation

[David Hildenbrand <david@redhat.com>]

We barely had mmap_offset set in the past. With virtio-mem and
dynamic-memslots that will change.

In vu_add_mem_reg() and vu_set_mem_table_exec_postcopy(), we are
performing pointer arithmetics, which is wrong. Let's simply
use dev_region->mmap_addr instead of "void *mmap_addr".

Fixes: ec94c8e621de ("Support adding individual regions in libvhost-user")
Fixes: 9bb38019942c ("vhost+postcopy: Send address back to qemu")
Cc: Raphael Norwitz <raphael.norwitz@nutanix.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
 subprojects/libvhost-user/libvhost-user.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/subprojects/libvhost-user/libvhost-user.c b/subprojects/libvhost-user/libvhost-user.c
index a3b158c671..7e515ed15d 100644
--- a/subprojects/libvhost-user/libvhost-user.c
+++ b/subprojects/libvhost-user/libvhost-user.c
@@ -800,8 +800,8 @@ vu_add_mem_reg(VuDev *dev, VhostUserMsg *vmsg) {
          * Return the address to QEMU so that it can translate the ufd
          * fault addresses back.
          */
-        msg_region->userspace_addr = (uintptr_t)(mmap_addr +
-                                                 dev_region->mmap_offset);
+        msg_region->userspace_addr = dev_region->mmap_addr +
+                                     dev_region->mmap_offset;
 
         /* Send the message back to qemu with the addresses filled in. */
         vmsg->fd_num = 0;
@@ -969,8 +969,8 @@ vu_set_mem_table_exec_postcopy(VuDev *dev, VhostUserMsg *vmsg)
         /* Return the address to QEMU so that it can translate the ufd
          * fault addresses back.
          */
-        msg_region->userspace_addr = (uintptr_t)(mmap_addr +
-                                                 dev_region->mmap_offset);
+        msg_region->userspace_addr = dev_region->mmap_addr +
+                                     dev_region->mmap_offset;
         close(vmsg->fds[i]);
     }
 
-- 
2.43.0