From f52d556e0e1bf2350b3b42cff198550a267ceb0b Mon Sep 17 00:00:00 2001
From: Johannes Stoelp <johannes.stoelp@gmail.com>
Date: Wed, 15 Nov 2023 22:40:07 +0100
Subject: example/long_mode: demonstrate mmio exits for virtually mapped but
 not physically backed memory

---
 guest/guest64.S | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'guest/guest64.S')

diff --git a/guest/guest64.S b/guest/guest64.S
index 533d186..1ca91a5 100644
--- a/guest/guest64.S
+++ b/guest/guest64.S
@@ -18,6 +18,13 @@
     mov byte ptr ds:[0x2002], 0xcc
     mov byte ptr ds:[0x2003], 0xdd
 
+    // Write to virtually mapped by not physically mapped address, this should
+    // trigger a `KVM_EXIT_MMIO (w)`.
+    mov byte ptr ds:[0x4000], 0x12
+    mov byte ptr ds:[0x4001], 0x34
+    mov byte ptr ds:[0x4002], 0x56
+    mov byte ptr ds:[0x4003], 0x78
+
     // Trigger `KVM_EXIT_HLT`.
     hlt
 
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