On Thu, Nov 24, 2022 at 2:23 PM Cindy Lu <lulu@xxxxxxxxxx> wrote:
>
> While testing in vIOMMU, sometimes guest will unmap very large memory,
> which will cause the crash.
Would you mind to post the calltrace?
> To fix this,Move the iommu_unmap to
> vhost_vdpa_pa_unmap/vhost_vdpa_va_unmap and only unmap the memory
> that saved in iotlb.
>
> Signed-off-by: Cindy Lu <lulu@xxxxxxxxxx>
Let's add a fixes tag which I believe should be the first commit that
introduces vhost-vDPA. And let's cc stable as well.
> ---
> drivers/vhost/vdpa.c | 10 ++++++++--
> 1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> index 166044642fd5..c392979702cf 100644
> --- a/drivers/vhost/vdpa.c
> +++ b/drivers/vhost/vdpa.c
> @@ -692,6 +692,8 @@ static void vhost_vdpa_pa_unmap(struct vhost_vdpa *v,
> struct vhost_iotlb_map *map;
> struct page *page;
> unsigned long pfn, pinned;
> + struct vdpa_device *vdpa = v->vdpa;
> + const struct vdpa_config_ops *ops = vdpa->config;
>
> while ((map = vhost_iotlb_itree_first(iotlb, start, last)) != NULL) {
> pinned = PFN_DOWN(map->size);
> @@ -703,6 +705,8 @@ static void vhost_vdpa_pa_unmap(struct vhost_vdpa *v,
> unpin_user_page(page);
> }
> atomic64_sub(PFN_DOWN(map->size), &dev->mm->pinned_vm);
> + if ((ops->dma_map == NULL) && (ops->set_map == NULL))
> + iommu_unmap(v->domain, map->start, map->size);
> vhost_iotlb_map_free(iotlb, map);
> }
> }
> @@ -713,11 +717,15 @@ static void vhost_vdpa_va_unmap(struct vhost_vdpa *v,
> {
> struct vhost_iotlb_map *map;
> struct vdpa_map_file *map_file;
> + struct vdpa_device *vdpa = v->vdpa;
> + const struct vdpa_config_ops *ops = vdpa->config;
>
> while ((map = vhost_iotlb_itree_first(iotlb, start, last)) != NULL) {
> map_file = (struct vdpa_map_file *)map->opaque;
> fput(map_file->file);
> kfree(map_file);
> + if ((ops->dma_map == NULL) && (ops->set_map == NULL))
> + iommu_unmap(v->domain, map->start, map->size);
I wonder if it's better to move at least dma_map() here.
Thanks
> vhost_iotlb_map_free(iotlb, map);
> }
> }
> @@ -805,8 +813,6 @@ static void vhost_vdpa_unmap(struct vhost_vdpa *v,
> } else if (ops->set_map) {
> if (!v->in_batch)
> ops->set_map(vdpa, asid, iotlb);
> - } else {
> - iommu_unmap(v->domain, iova, size);
> }
>
> /* If we are in the middle of batch processing, delay the free
> --
> 2.34.3
>
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