xen: issue deprecation warning for 32-bit pv guest

Support for the kernel as Xen 32-bit PV guest will soon be removed.
Issue a warning when booted as such.

Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 7ceb32821093a226995a86e9832c59b9b9d586ae..bd5a61f2c9f1b3c73971d9a7b5d22d02f22ff595 100644 (file)
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -117,6 +117,14 @@ static void __init xen_banner(void)
        printk(KERN_INFO "Xen version: %d.%d%s%s\n",
               version >> 16, version & 0xffff, extra.extraversion,
               xen_feature(XENFEAT_mmu_pt_update_preserve_ad) ? " (preserve-AD)" : "");
+
+#ifdef CONFIG_X86_32
+       pr_warn("WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING!\n"
+               "Support for running as 32-bit PV-guest under Xen will soon be removed\n"
+               "from the Linux kernel!\n"
+               "Please use either a 64-bit kernel or switch to HVM or PVH mode!\n"
+               "WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING!\n");
+#endif
 }
 
 static void __init xen_pv_init_platform(void)