From 0103d09ebe6dede5b3cbea09c9e3f64662d8cabf Mon Sep 17 00:00:00 2001
From: YuanhaoXie <yuanhao.xie@intel.com>
Date: Tue, 4 Jul 2023 11:23:52 +0800
Subject: UefiCpuPkg/MtrrLib: Update MtrrGetFixedMtrr().

IsMtrrSupported() return true when either fixed mtrr supported or
variable mtrr suppored. In this case, rather than checking whether
MTRR is supported or not, we should specifically check for fixed MTRR
support.

Signed-off-by: Yuanhao Xie <yuanhao.xie@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Ray Ni <ray.ni@intel.com>

Reviewed-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
---
 UefiCpuPkg/Library/MtrrLib/MtrrLib.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/UefiCpuPkg/Library/MtrrLib/MtrrLib.c b/UefiCpuPkg/Library/MtrrLib/MtrrLib.c
index c9440f01ef..255a8ebf81 100644
--- a/UefiCpuPkg/Library/MtrrLib/MtrrLib.c
+++ b/UefiCpuPkg/Library/MtrrLib/MtrrLib.c
@@ -468,7 +468,11 @@ MtrrGetFixedMtrr (
   OUT MTRR_FIXED_SETTINGS  *FixedSettings
   )
 {
-  if (!IsMtrrSupported ()) {
+  BOOLEAN  FixedMtrrSupported;
+
+  MtrrLibIsMtrrSupported (&FixedMtrrSupported, NULL);
+
+  if (!FixedMtrrSupported) {
     return FixedSettings;
   }
 
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