diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index f66be7a6f5dd65c27349e359e5c7c18791a0bc04..ce2c6f8bd2d121b72a026bca7358f00ee39ffea9 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -59,7 +59,7 @@ static short xsave_cpuid_features[] __initdata = {
  * This represents the full set of bits that should ever be set in a kernel
  * XSAVE buffer, both supervisor and user xstates.
  */
-u64 xfeatures_mask_all __read_mostly;
+u64 xfeatures_mask_all __ro_after_init;
 
 static unsigned int xstate_offsets[XFEATURE_MAX] __ro_after_init =
 	{ [ 0 ... XFEATURE_MAX - 1] = -1};
@@ -213,19 +213,8 @@ void fpstate_sanitize_xstate(struct fpu *fpu)
  */
 void fpu__init_cpu_xstate(void)
 {
-	u64 unsup_bits;
-
 	if (!boot_cpu_has(X86_FEATURE_XSAVE) || !xfeatures_mask_all)
 		return;
-	/*
-	 * Unsupported supervisor xstates should not be found in
-	 * the xfeatures mask.
-	 */
-	unsup_bits = xfeatures_mask_all & XFEATURE_MASK_SUPERVISOR_UNSUPPORTED;
-	WARN_ONCE(unsup_bits, "x86/fpu: Found unsupported supervisor xstates: 0x%llx\n",
-		  unsup_bits);
-
-	xfeatures_mask_all &= ~XFEATURE_MASK_SUPERVISOR_UNSUPPORTED;
 
 	cr4_set_bits(X86_CR4_OSXSAVE);
 
@@ -825,6 +814,7 @@ void __init fpu__init_system_xstate(void)
 {
 	unsigned int eax, ebx, ecx, edx;
 	static int on_boot_cpu __initdata = 1;
+	u64 xfeatures;
 	int err;
 	int i;
 
@@ -879,6 +869,8 @@ void __init fpu__init_system_xstate(void)
 	}
 
 	xfeatures_mask_all &= fpu__get_supported_xfeatures_mask();
+	/* Store it for paranoia check at the end */
+	xfeatures = xfeatures_mask_all;
 
 	/* Enable xstate instructions to be able to continue with initialization: */
 	fpu__init_cpu_xstate();
@@ -896,8 +888,18 @@ void __init fpu__init_system_xstate(void)
 	setup_init_fpu_buf();
 	setup_xstate_comp_offsets();
 	setup_supervisor_only_offsets();
-	print_xstate_offset_size();
 
+	/*
+	 * Paranoia check whether something in the setup modified the
+	 * xfeatures mask.
+	 */
+	if (xfeatures != xfeatures_mask_all) {
+		pr_err("x86/fpu: xfeatures modified from 0x%016llx to 0x%016llx during init, disabling XSAVE\n",
+		       xfeatures, xfeatures_mask_all);
+		goto out_disable;
+	}
+
+	print_xstate_offset_size();
 	pr_info("x86/fpu: Enabled xstate features 0x%llx, context size is %d bytes, using '%s' format.\n",
 		xfeatures_mask_all,
 		fpu_kernel_xstate_size,