[Xen-devel] [PATCH 15/18] xen/arm: Introduce a helper to synchronize SError

[Wei Chen <Wei.Chen@xxxxxxx>]

We may have to isolate the SError between the context switch of
2 vCPUs or may have to prevent slipping hypervisor SError to guest.
So we need a helper to synchronize SError before context switching
or returning to guest.

This function will be used by the later patches in this series, we
use "#if 0" to disable it temporarily to remove compiler warnning.

Signed-off-by: Wei Chen <Wei.Chen@xxxxxxx>
---
 xen/arch/arm/traps.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index 44a0281..ee7865b 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -2899,6 +2899,17 @@ asmlinkage void do_trap_hypervisor(struct cpu_user_regs 
*regs)
     }
 }
 
+#if 0
+static void synchronize_serror(void)
+{
+    /* Synchronize against in-flight ld/st. */
+    dsb(sy);
+
+    /* A single instruction exception window */
+    isb();
+}
+#endif
+
 asmlinkage void do_trap_hyp_serror(struct cpu_user_regs *regs)
 {
     enter_hypervisor_head(regs);
-- 
2.7.4


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel