Re: [PATCH v3] vfio error recovery: kernel support

[Jason Wang]

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