From 77e25f0e30ddd11e043e6fce84bf108ce7de5b6f Mon Sep 17 00:00:00 2001
From: Jan Beulich <jbeulich@suse.com>
Date: Tue, 23 Apr 2024 14:13:48 +0200
Subject: [PATCH] x86/MTRR: correct inadvertently inverted WC check
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The ! clearly got lost by mistake.

Fixes: e9e0eb30d4d6 ("x86/MTRR: avoid several indirect calls")
Reported-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
---
 xen/arch/x86/cpu/mtrr/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/cpu/mtrr/main.c b/xen/arch/x86/cpu/mtrr/main.c
index 55a4da54a7..90b235f57e 100644
--- a/xen/arch/x86/cpu/mtrr/main.c
+++ b/xen/arch/x86/cpu/mtrr/main.c
@@ -316,7 +316,7 @@ int mtrr_add_page(unsigned long base, unsigned long size,
 	}
 
 	/*  If the type is WC, check that this processor supports it  */
-	if ((type == X86_MT_WC) && mtrr_have_wrcomb()) {
+	if ((type == X86_MT_WC) && !mtrr_have_wrcomb()) {
 		printk(KERN_WARNING
 		       "mtrr: your processor doesn't support write-combining\n");
 		return -EOPNOTSUPP;
-- 
2.39.5