From: Michal Simek <michal.simek@amd.com>
Date: Tue, 18 Apr 2023 12:51:56 +0000 (+0200)
Subject: xen: Limit execution to EL1 only
X-Git-Url: http://git.dujemihanovic.xyz/%22http:/www.sics.se/static/%7B%7B%20.RelPermalink%20%7D%7D?a=commitdiff_plain;h=b411ba921005f8aa7978dbd1c5fee630c4af298d;p=u-boot.git

xen: Limit execution to EL1 only

Xen core_init() is calling HVC which should be called from EL1 level that's
why do Xen initialization only when U-Boot runs in EL1.

Signed-off-by: Michal Simek <michal.simek@amd.com>
---

diff --git a/drivers/xen/hypervisor.c b/drivers/xen/hypervisor.c
index 16c7c96c94..0b2311ba26 100644
--- a/drivers/xen/hypervisor.c
+++ b/drivers/xen/hypervisor.c
@@ -264,8 +264,15 @@ void clear_evtchn(uint32_t port)
 
 int xen_init(void)
 {
+	int el = current_el();
+
 	debug("%s\n", __func__);
 
+	if (el != 1) {
+		puts("XEN:\tnot running from EL1\n");
+		return 0;
+	}
+
 	map_shared_info(NULL);
 	init_events();
 	init_xenbus();