[PATCH 17/18] xen/arm: Prevent slipping hypervisor SError to guest

[Wei Chen <Wei.Chen@arm.com>]

If there is a pending SError while we're returning from trap. If the
SError handle option is "DIVERSE", we have to prevent slipping this
hypervisor SError to guest. So we have to use the dsb/isb to guarantee
that the pending hypervisor SError would be caught in hypervisor before
return to guest.

Signed-off-by: Wei Chen <Wei.Chen@arm.com>
---
 xen/arch/arm/traps.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index b8c8389..3b84e80 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -2953,6 +2953,16 @@ asmlinkage void leave_hypervisor_tail(void)
         local_irq_disable();
         if (!softirq_pending(smp_processor_id())) {
             gic_inject();
+
+            /*
+             * If the SErrors handle option is "DIVERSE", we have to prevent
+             * slipping the hypervisor SError to guest. So before returning
+             * from trap, we use the synchronize_serror to guarantee that the
+             * pending SError would be caught in hypervisor.
+             */
+            if ( serrors_op == SERRORS_DIVERSE )
+                synchronize_serror();
+
             WRITE_SYSREG(current->arch.hcr_el2, HCR_EL2);
             return;
         }
-- 
2.7.4


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