From e87b644e0b26c428aec15dfe1f64aa12e7651fd5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Kr=C3=B6ning?=
 <martin.kroening@eonerc.rwth-aachen.de>
Date: Tue, 24 Dec 2024 14:50:31 +0100
Subject: [PATCH] fix(x86_64): use correct MSR for `read{fs,gs}`

---
 src/arch/x86_64/kernel/processor.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/arch/x86_64/kernel/processor.rs b/src/arch/x86_64/kernel/processor.rs
index 0ddfdbf1d8..e5003674d2 100644
--- a/src/arch/x86_64/kernel/processor.rs
+++ b/src/arch/x86_64/kernel/processor.rs
@@ -1079,7 +1079,7 @@ pub fn readfs() -> usize {
 	if cfg!(feature = "fsgsbase") {
 		unsafe { segmentation::rdfsbase() }
 	} else {
-		unsafe { rdmsr(IA32_GS_BASE) }
+		unsafe { rdmsr(IA32_FS_BASE) }
 	}
 	.try_into()
 	.unwrap()
@@ -1090,7 +1090,7 @@ pub fn readgs() -> usize {
 	if cfg!(feature = "fsgsbase") {
 		unsafe { segmentation::rdgsbase() }
 	} else {
-		unsafe { rdmsr(IA32_FS_BASE) }
+		unsafe { rdmsr(IA32_GS_BASE) }
 	}
 	.try_into()
 	.unwrap()