On Tue, Apr 13, 2021 at 11:22:16AM -0400, Tianyu Lan wrote:
> From: Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>
>
> In Isolation VM, all shared memory with host needs to mark visible
> to host via hvcall. vmbus_establish_gpadl() has already done it for
> netvsc rx/tx ring buffer. The page buffer used by vmbus_sendpacket_
> pagebuffer() still need to handle. Use DMA API to map/umap these
> memory during sending/receiving packet and Hyper-V DMA ops callback
> will use swiotlb fucntion to allocate bounce buffer and copy data
> from/to bounce buffer.
>
> Signed-off-by: Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>
> ---
> drivers/net/hyperv/hyperv_net.h | 11 +++
> drivers/net/hyperv/netvsc.c | 137 ++++++++++++++++++++++++++++--
> drivers/net/hyperv/rndis_filter.c | 3 +
> 3 files changed, 144 insertions(+), 7 deletions(-)
<...>
> + packet->dma_range = kzalloc(sizeof(struct dma_range) * page_count,
> + GFP_KERNEL);
> + if (!packet->dma_range)
> + return -ENOMEM;
> +
> + for (i = 0; i < page_count; i++) {
> + char *src = phys_to_virt((pb[i].pfn << HV_HYP_PAGE_SHIFT)
> + + pb[i].offset);
> + u32 len = pb[i].len;
> +
> + dma = dma_map_single(&hv_dev->device, src, len,
> + DMA_TO_DEVICE);
> + if (dma_mapping_error(&hv_dev->device, dma))
> + return -ENOMEM;
Don't you leak dma_range here?
BTW, It will be easier if you CC all on all patches, so we will be able
to get whole context.
Thanks
