From ae14d81757945a8298a34e00e82abe68d90644e7 Mon Sep 17 00:00:00 2001
From: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Date: Fri, 9 Feb 2018 18:51:32 +0000
Subject: [PATCH] cuda: don't allow writes to port output pins
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Use the direction registers as a mask to ensure that only input pins are
updated upon write.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 hw/misc/macio/cuda.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/misc/macio/cuda.c b/hw/misc/macio/cuda.c
index 6631017ca2..eaa8924f49 100644
--- a/hw/misc/macio/cuda.c
+++ b/hw/misc/macio/cuda.c
@@ -359,11 +359,11 @@ static void cuda_write(void *opaque, hwaddr addr, uint64_t val, unsigned size)
 
     switch(addr) {
     case CUDA_REG_B:
-        s->b = val;
+        s->b = (s->b & ~s->dirb) | (val & s->dirb);
         cuda_update(s);
         break;
     case CUDA_REG_A:
-        s->a = val;
+        s->a = (s->a & ~s->dira) | (val & s->dira);
         break;
     case CUDA_REG_DIRB:
         s->dirb = val;
-- 
2.11.0