From 60003d1d67ca17000e0501ac48878e60345c7307 Mon Sep 17 00:00:00 2001
From: Zelin Deng <zelin.deng@linux.alibaba.com>
Date: Fri, 9 Apr 2021 11:17:06 +0800
Subject: [PATCH 2681/2944] alinux: virtio_ring: Force use dma api when AMD SEV
 is actived

to #39258954

guest which is using virtio must use unencrypted memory for interacting
with virtio backend. Therefore virtio_ring must use dma api to
initialize vqs.

Signed-off-by: Zelin Deng <zelin.deng@linux.alibaba.com>
Reviewed-by: Artie Ding <artie.ding@linux.alibaba.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
---
 drivers/virtio/virtio_ring.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index e64e111..a32afbf 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -26,6 +26,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/moduleparam.h>
 #include <xen/xen.h>
+#include <linux/mem_encrypt.h>
 
 static bool vring_force_dma_api = false;
 
@@ -181,6 +182,9 @@ static bool vring_use_dma_api(struct virtio_device *vdev)
 	if (xen_domain())
 		return true;
 
+	if (sev_active())
+		return true;
+
 	return false;
 }
 
-- 
1.8.3.1