[PATCH v3 20/28] vhost: add VDUSE callback for IOTLB entry removal

[Xia, Chenbo]

> -----Original Message-----
> From: Maxime Coquelin <maxime.coquelin at redhat.com>
> Sent: Friday, May 26, 2023 12:26 AM
> To: dev at dpdk.org; Xia, Chenbo <chenbo.xia at intel.com>;
> david.marchand at redhat.com; mkp at redhat.com; fbl at redhat.com;
> jasowang at redhat.com; Liang, Cunming <cunming.liang at intel.com>; Xie, Yongji
> <xieyongji at bytedance.com>; echaudro at redhat.com; eperezma at redhat.com;
> amorenoz at redhat.com; lulu at redhat.com
> Cc: Maxime Coquelin <maxime.coquelin at redhat.com>
> Subject: [PATCH v3 20/28] vhost: add VDUSE callback for IOTLB entry
> removal
> 
> This patch implements the VDUSE callback for IOTLB entry
> removal, where it unmaps the pages from the invalidated
> IOTLB entry.
> 
> Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
> ---
>  lib/vhost/vduse.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/lib/vhost/vduse.c b/lib/vhost/vduse.c
> index f72c7bf6ab..58c1b384a8 100644
> --- a/lib/vhost/vduse.c
> +++ b/lib/vhost/vduse.c
> @@ -42,6 +42,12 @@
>  				(1ULL << VIRTIO_F_IN_ORDER) | \
>  				(1ULL << VIRTIO_F_IOMMU_PLATFORM))
> 
> +static void
> +vduse_iotlb_remove_notify(uint64_t addr, uint64_t offset, uint64_t size)
> +{
> +	munmap((void *)(uintptr_t)addr, offset + size);
> +}
> +
>  static int
>  vduse_iotlb_miss(struct virtio_net *dev, uint64_t iova, uint8_t perm
> __rte_unused)
>  {
> @@ -99,6 +105,7 @@ vduse_iotlb_miss(struct virtio_net *dev, uint64_t iova,
> uint8_t perm __rte_unuse
> 
>  static struct vhost_backend_ops vduse_backend_ops = {
>  	.iotlb_miss = vduse_iotlb_miss,
> +	.iotlb_remove_notify = vduse_iotlb_remove_notify,
>  };
> 
>  int
> --
> 2.40.1

Reviewed-by: Chenbo Xia <chenbo.xia at intel.com>