From 32a3a6865a636d520a90138f48f0023fe51d6d3a Mon Sep 17 00:00:00 2001
From: mio <mio@lazym.io>
Date: Sun, 25 Sep 2022 17:41:09 +0200
Subject: [PATCH] Don't resize user alloc-ed memory

---
 qemu/exec.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/qemu/exec.c b/qemu/exec.c
index 719895a3..2a664788 100644
--- a/qemu/exec.c
+++ b/qemu/exec.c
@@ -1087,8 +1087,12 @@ RAMBlock *qemu_ram_alloc_from_ptr(struct uc_struct *uc, ram_addr_t size, void *h
     RAMBlock *new_block;
     ram_addr_t max_size = size;
 
-    size = HOST_PAGE_ALIGN(uc, size);
-    max_size = HOST_PAGE_ALIGN(uc, max_size);
+    // Don't resize pre-alloced memory as they are given by users.
+    if (!host) {
+        size = HOST_PAGE_ALIGN(uc, size);
+        max_size = HOST_PAGE_ALIGN(uc, max_size);
+    }
+
     new_block = g_malloc0(sizeof(*new_block));
     if (new_block == NULL)
         return NULL;