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SubjectRe: [PATCH v4 7/8] vfio/type1: Add domain at(de)taching group helpers
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Hi Lu,

On 11/5/18 8:34 AM, Lu Baolu wrote:
> This adds helpers to attach or detach a domain to a
> group. This will replace iommu_attach_group() which
> only works for pci devices.
s/pci/non mdev?
>
> If a domain is attaching to a group which includes the
> mediated devices, it should attach to the iommu device
> (a pci device which represents the mdev in iommu scope)
> instead. The added helper supports attaching domain to
> groups for both pci and mdev devices.
>
> Cc: Ashok Raj <ashok.raj@intel.com>
> Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
> Cc: Kevin Tian <kevin.tian@intel.com>
> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
> Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
> ---
> drivers/vfio/vfio_iommu_type1.c | 114 ++++++++++++++++++++++++++++++--
> 1 file changed, 107 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
> index d9fd3188615d..178264b330e7 100644
> --- a/drivers/vfio/vfio_iommu_type1.c
> +++ b/drivers/vfio/vfio_iommu_type1.c
> @@ -91,6 +91,7 @@ struct vfio_dma {
> struct vfio_group {
> struct iommu_group *iommu_group;
> struct list_head next;
> + bool mdev_group; /* An mdev group */
> };
>
> /*
> @@ -1327,6 +1328,105 @@ static bool vfio_iommu_has_sw_msi(struct iommu_group *group, phys_addr_t *base)
> return ret;
> }
>
> +static struct device *vfio_mdev_get_iommu_device(struct device *dev)
> +{
> + struct device *(*fn)(struct device *dev);
> + struct device *iommu_parent;
> +
> + fn = symbol_get(mdev_get_iommu_device);
> + if (fn) {
> + iommu_parent = fn(dev);
> + symbol_put(mdev_get_iommu_device);
> +
> + return iommu_parent;
> + }
> +
> + return NULL;
> +}
> +
> +static int vfio_mdev_set_domain(struct device *dev, struct iommu_domain *domain)
> +{
> + int (*fn)(struct device *dev, void *domain);
> + int ret;
> +
> + fn = symbol_get(mdev_set_iommu_domain);
> + if (fn) {
> + ret = fn(dev, domain);
> + symbol_put(mdev_set_iommu_domain);
> +
> + return ret;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static int vfio_mdev_attach_domain(struct device *dev, void *data)
> +{
> + struct iommu_domain *domain = data;
> + struct device *iommu_device;
> + int ret;
> +
> + ret = vfio_mdev_set_domain(dev, domain);
> + if (ret)
> + return ret;
> +
> + iommu_device = vfio_mdev_get_iommu_device(dev);
> + if (iommu_device) {
> + bool aux_mode = false;
> +
> + iommu_get_dev_attr(iommu_device,
> + IOMMU_DEV_ATTR_AUXD_ENABLED, &aux_mode);
Don' you need to test the returned value before using aux_mode?
> + if (aux_mode)
> + return iommu_attach_device_aux(domain, iommu_device);
> + else
> + return iommu_attach_device(domain, iommu_device);
if for some reason the above ops fail, don't you want to call
vfio_mdev_set_domain(dev, NULL)

> + }
> +
> + return -EINVAL;
> +}
> +
> +static int vfio_mdev_detach_domain(struct device *dev, void *data)
> +{
> + struct iommu_domain *domain = data;
> + struct device *iommu_device;
> +
> + vfio_mdev_set_domain(dev, NULL);
> + iommu_device = vfio_mdev_get_iommu_device(dev);
> + if (iommu_device) {
> + bool aux_mode = false;
> +
> + iommu_get_dev_attr(iommu_device,
> + IOMMU_DEV_ATTR_AUXD_ENABLED, &aux_mode);
same here
> + if (aux_mode)
> + iommu_detach_device_aux(domain, iommu_device);
> + else
> + iommu_detach_device(domain, iommu_device);
> + }
> +
> + return 0;
> +}
> +
> +static int vfio_iommu_attach_group(struct vfio_domain *domain,
> + struct vfio_group *group)
> +{
> + if (group->mdev_group)
> + return iommu_group_for_each_dev(group->iommu_group,
> + domain->domain,
> + vfio_mdev_attach_domain);
> + else
> + return iommu_attach_group(domain->domain, group->iommu_group);
> +}
> +
> +static void vfio_iommu_detach_group(struct vfio_domain *domain,
> + struct vfio_group *group)
> +{
> + if (group->mdev_group)
> + iommu_group_for_each_dev(group->iommu_group, domain->domain,
> + vfio_mdev_detach_domain);
> + else
> + iommu_detach_group(domain->domain, group->iommu_group);
> +}
> +
> static int vfio_iommu_type1_attach_group(void *iommu_data,
> struct iommu_group *iommu_group)
> {
> @@ -1402,7 +1502,7 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
> goto out_domain;
> }
>
> - ret = iommu_attach_group(domain->domain, iommu_group);
> + ret = vfio_iommu_attach_group(domain, group);
> if (ret)
> goto out_domain;
>
> @@ -1434,8 +1534,8 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
> list_for_each_entry(d, &iommu->domain_list, next) {
> if (d->domain->ops == domain->domain->ops &&
> d->prot == domain->prot) {
> - iommu_detach_group(domain->domain, iommu_group);
> - if (!iommu_attach_group(d->domain, iommu_group)) {
> + vfio_iommu_detach_group(domain, group);
> + if (!vfio_iommu_attach_group(d, group)) {
> list_add(&group->next, &d->group_list);
> iommu_domain_free(domain->domain);
> kfree(domain);
> @@ -1443,7 +1543,7 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
> return 0;
> }
>
> - ret = iommu_attach_group(domain->domain, iommu_group);
> + ret = vfio_iommu_attach_group(domain, group);
> if (ret)
> goto out_domain;
> }
> @@ -1469,7 +1569,7 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
> return 0;
>
> out_detach:
> - iommu_detach_group(domain->domain, iommu_group);
> + vfio_iommu_detach_group(domain, group);
> out_domain:
> iommu_domain_free(domain->domain);
> out_free:
> @@ -1560,7 +1660,7 @@ static void vfio_iommu_type1_detach_group(void *iommu_data,
> if (!group)
> continue;
>
> - iommu_detach_group(domain->domain, iommu_group);
> + vfio_iommu_detach_group(domain, group);
> list_del(&group->next);
> kfree(group);
> /*
> @@ -1625,7 +1725,7 @@ static void vfio_release_domain(struct vfio_domain *domain, bool external)
> list_for_each_entry_safe(group, group_tmp,
> &domain->group_list, next) {
> if (!external)
> - iommu_detach_group(domain->domain, group->iommu_group);
> + vfio_iommu_detach_group(domain, group);
> list_del(&group->next);
> kfree(group);
> }
>
Thanks

Eric

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