On 2017年01月22日 15:38, Michael S. Tsirkin wrote:
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 26c155b..6b0f416 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -159,7 +159,17 @@ static inline bool virtio_has_iommu_quirk(const struct
virtio_device *vdev)
* Note the reverse polarity of the quirk feature (compared to most
* other features), this is for compatibility with legacy systems.
*/
- return !virtio_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM);
+ if (virtio_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM))
+ return false;
+
+ /*
+ * fastboot emulator for ARM puts virtio devices behind an SMMU
+ * and never bypasses it for legacy devices.
+ */
+ if (IS_ENABLED(CONFIG_ARM) || IS_ENABLED(CONFIG_ARM64))
+ return virtio_has_feature(vdev, VIRTIO_F_VERSION_1);
+
+ return true;
}
Hi Michael:
This part of codes seems unrelated.
Thanks
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