From 3ebd8b163dc8d5679d90927de1c2fcd639882362 Mon Sep 17 00:00:00 2001
From: Johannes Stoelp <johannes.stoelp@gmail.com>
Date: Fri, 14 Mar 2025 02:13:23 +0100
Subject: guest: add 64bit guest to toy with msr

Guest to toy with msr register and the swapgs instruction.
---
 guest/guest64.S | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'guest/guest64.S')

diff --git a/guest/guest64.S b/guest/guest64.S
index 1ca91a5..dc3e986 100644
--- a/guest/guest64.S
+++ b/guest/guest64.S
@@ -2,7 +2,7 @@
 
 .section .boot, "ax", @progbits
     // Trigger `KVM_EXIT_IO:KVM_EXIT_IO_OUT` by writing string to output port.
-    mov rdx, 0x1000             // Output port.
+    mov rdx, 0x42               // Output port (magic for string fmt).
     lea rsi, [rip + msg]        // Address of string.
     mov rcx, [rip + msg_len]    // Len of string.
     rep outsb                   // Write ds:rsi to output port rdx.
@@ -30,7 +30,7 @@
 
 .section .rodata, "a", @progbits
 msg:
-    .asciz "Hello from Long Mode!\n"
+    .ascii "Hello from Long Mode!\n"
 msg_len:
     .byte .-msg
 
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