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
