On Wed, Jun 08, 2022 at 05:55:52PM -0700, Dongli Zhang wrote: > /* Unique numbering for virtio devices. */ > @@ -241,6 +243,12 @@ static int virtio_dev_probe(struct device *_d) > u64 device_features; > u64 driver_features; > u64 driver_features_legacy; > + struct device *parent = dev->dev.parent; > + u64 dma_mask = min_not_zero(*parent->dma_mask, > + parent->bus_dma_limit); > + > + if (dma_mask == DMA_BIT_MASK(64)) > + swiotlb_use_high(parent);
The driver already very clearly communicated its addressing requirements. The underlying swiotlb code needs to transparently pick the right pool.
