[Lguest] [PATCH 02/18] virtio_test: update for 64 bit features

[Michael S. Tsirkin]

Extend the virtio_test tool so it can work with
64 bit features.

Signed-off-by: Michael S. Tsirkin <mst at redhat.com>
---
 tools/virtio/virtio_test.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
index df0c6d2..9e65e6d 100644
--- a/tools/virtio/virtio_test.c
+++ b/tools/virtio/virtio_test.c
@@ -55,7 +55,6 @@ void vhost_vq_setup(struct vdev_info *dev, struct vq_info *info)
 {
 	struct vhost_vring_state state = { .index = info->idx };
 	struct vhost_vring_file file = { .index = info->idx };
-	unsigned long long features = dev->vdev.features[0];
 	struct vhost_vring_addr addr = {
 		.index = info->idx,
 		.desc_user_addr = (uint64_t)(unsigned long)info->vring.desc,
@@ -63,6 +62,10 @@ void vhost_vq_setup(struct vdev_info *dev, struct vq_info *info)
 		.used_user_addr = (uint64_t)(unsigned long)info->vring.used,
 	};
 	int r;
+	unsigned long long features = dev->vdev.features[0];
+	if (sizeof features > sizeof dev->vdev.features[0])
+		features |= ((unsigned long long)dev->vdev.features[1]) << 32;
+
 	r = ioctl(dev->control, VHOST_SET_FEATURES, &features);
 	assert(r >= 0);
 	state.num = info->vring.num;
@@ -107,7 +110,8 @@ static void vdev_info_init(struct vdev_info* dev, unsigned long long features)
 	int r;
 	memset(dev, 0, sizeof *dev);
 	dev->vdev.features[0] = features;
-	dev->vdev.features[1] = features >> 32;
+	if (sizeof features > sizeof dev->vdev.features[0])
+		dev->vdev.features[1] = features >> 32;
 	dev->buf_size = 1024;
 	dev->buf = malloc(dev->buf_size);
 	assert(dev->buf);
-- 
1.7.5.53.gc233e