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In preparation for bouncing virtio data for devices advertising the VIRTIO_F_IOMMU_PLATFORM feature, allocate an array of bounce buffer structures in the vring, one per descriptor. Signed-off-by: Will Deacon <willdeacon@google.com> [ Paul: pick from the Android tree. Rebase to the upstream ] Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org> Cc: Bin Meng <bmeng.cn@gmail.com> Link: https://android.googlesource.com/platform/external/u-boot/+/3e052749e7c50c4c1a6014e645ae3b9be3710c07 Reviewed-by: Simon Glass <sjg@chromium.org>
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