[dpdk-stable] [dpdk-dev] [PATCH] vfio: allow secondary process to query IOMMU type
Burakov, Anatoly
anatoly.burakov at intel.com
Fri Jan 18 11:13:26 CET 2019
On 17-Jan-19 5:30 PM, Anatoly Burakov wrote:
> It is only possible to know IOMMU type of a given VFIO container
> by attempting to initialize it. Since secondary process never
> attempts to set up VFIO container itself (because they're shared
> between primary and secondary), it never knows which IOMMU type
> the container is using, and never sets up the appropriate config
> structures. This results in inability to perform DMA mappings in
> secondary process.
>
> Fix this by allowing secondary process to query IOMMU type of
> primary's default container at device initialization.
>
> Note that this fix is assuming we're only interested in default
> container.
>
> Bugzilla ID: 174
>
> Fixes: 6bcb7c95fe14 ("vfio: share default container in multi-process")
> Cc: dariusz.stojaczyk at intel.com
> Cc: stable at dpdk.org
>
> Signed-off-by: Anatoly Burakov <anatoly.burakov at intel.com>
> ---
<...>
> + /* we now have an fd for default container, as well as its IOMMU type.
> + * now, set up default VFIO container config to match.
> + */
> + for (i = 0; i < RTE_DIM(iommu_types); i++) {
> + const struct vfio_iommu_type *t = &iommu_types[i];
> + if (t->type_id != iommu_type_id)
> + continue;
> +
> + /* we found our IOMMU type */
> + default_vfio_cfg->vfio_enabled = 1;
> + default_vfio_cfg->vfio_container_fd = vfio_container_fd;
> + default_vfio_cfg->vfio_iommu_type = t;
> + break;
> + }
Self-review: if IOMMU type wasn't found, we still return 0. Will fix in v2.
> +
> + return 0;
> +}
> +
> int
> rte_vfio_clear_group(int vfio_group_fd)
> {
> @@ -745,6 +805,26 @@ rte_vfio_setup_device(const char *sysfs_base, const char *dev_addr,
> else
> RTE_LOG(DEBUG, EAL, "Installed memory event callback for VFIO\n");
--
Thanks,
Anatoly
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