SDEI: Determine client EL from NS context's SCR_EL3
Currently, the dispatcher reads from SCR_EL3 register directly to
determine the EL of SDEI client. This is with the assumption that
SCR_EL3 is not modified throughout. However, with RAS work flows, it's
possible that SCR_EL3 register contains values corresponding to Secure
world, and therefore EL determination can go wrong. To mitigate this,
always read the register from the saved Non-secure context.
Change-Id: Ic85e4021deb18eb58757f676f9a001174998543a
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>
diff --git a/services/std_svc/sdei/sdei_private.h b/services/std_svc/sdei/sdei_private.h
index 45d537f..ec4148c 100644
--- a/services/std_svc/sdei/sdei_private.h
+++ b/services/std_svc/sdei/sdei_private.h
@@ -8,6 +8,7 @@
#define __SDEI_PRIVATE_H__
#include <arch_helpers.h>
+#include <context_mgmt.h>
#include <debug.h>
#include <errno.h>
#include <interrupt_mgmt.h>
@@ -159,7 +160,11 @@
*/
static inline unsigned int sdei_client_el(void)
{
- return read_scr_el3() & SCR_HCE_BIT ? MODE_EL2 : MODE_EL1;
+ cpu_context_t *ns_ctx = cm_get_context(NON_SECURE);
+ el3_state_t *el3_ctx = get_el3state_ctx(ns_ctx);
+
+ return read_ctx_reg(el3_ctx, CTX_SPSR_EL3) & SCR_HCE_BIT ? MODE_EL2 :
+ MODE_EL1;
}
static inline unsigned int sdei_event_priority(sdei_ev_map_t *map)