x86/execmem: fix ROX cache usage in Xen PV guests

jira LE-4694
Rebuild_History Non-Buildable kernel-6.12.0-55.43.1.el10_0
commit-author Juergen Gross <jgross@suse.com>
commit 59f5910

The recently introduced ROX cache for modules is assuming large page
support in 64-bit mode without testing the related feature bit.  This
results in breakage when running as a Xen PV guest, as in this mode large
pages are not supported.

Fix that by testing the X86_FEATURE_PSE capability when deciding whether
to enable the ROX cache.

Link: https://lkml.kernel.org/r/20250103065631.26459-1-jgross@suse.com
Fixes: 2e45474 ("execmem: add support for cache of large ROX pages")
	Signed-off-by: Juergen Gross <jgross@suse.com>
	Reported-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
	Tested-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
	Cc: Luis Chamberlain <mcgrof@kernel.org>
	Cc: Andy Lutomirski <luto@kernel.org>
	Cc: Dave Hansen <dave.hansen@linux.intel.com>
	Cc: "H. Peter Anvin" <hpa@zytor.com>
	Cc: Ingo Molnar <mingo@redhat.com>
	Cc: Mike Rapoport (Microsoft) <rppt@kernel.org>
	Cc: Peter Zijlstra <peterz@infradead.org>
	Cc: Thomas Gleixner <tglx@linutronix.de>
	Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
(cherry picked from commit 59f5910)
	Signed-off-by: Jonathan Maple <jmaple@ciq.com>

Author: PlaidCat

arch/x86/mm/init.c

@@ -1075,7 +1075,8 @@ struct execmem_info __init *execmem_arch_setup(void)
 
 	start = MODULES_VADDR + offset;
 
-	if (IS_ENABLED(CONFIG_ARCH_HAS_EXECMEM_ROX)) {
+	if (IS_ENABLED(CONFIG_ARCH_HAS_EXECMEM_ROX) &&
+	    cpu_feature_enabled(X86_FEATURE_PSE)) {
 		pgprot = PAGE_KERNEL_ROX;
 		flags = EXECMEM_KASAN_SHADOW | EXECMEM_ROX_CACHE;
 	} else {