On Sun, Jan 22, 2017 at 04:01:28PM +0800, Jason Wang wrote: > > > 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 Of course it is, thanks!
