On Wed, 11 Jan 2017 09:41:52 +0000 Eric Auger <[email protected]> wrote:
> When attaching a group to the container, check the group's > reserved regions and test whether the IOMMU translates MSI > transactions. If yes, we initialize an IOVA allocator through > the iommu_get_msi_cookie API. This will allow the MSI IOVAs > to be transparently allocated on MSI controller's compose(). > > Signed-off-by: Eric Auger <[email protected]> Acked-by: Alex Williamson <[email protected]> > --- > > v3 -> v4: > - test region's type: IOMMU_RESV_MSI > - restructure the code to prepare for safety assessment > - reword title > --- > drivers/vfio/vfio_iommu_type1.c | 30 ++++++++++++++++++++++++++++++ > 1 file changed, 30 insertions(+) > > diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c > index 9266271..5651faf 100644 > --- a/drivers/vfio/vfio_iommu_type1.c > +++ b/drivers/vfio/vfio_iommu_type1.c > @@ -39,6 +39,7 @@ > #include <linux/pid_namespace.h> > #include <linux/mdev.h> > #include <linux/notifier.h> > +#include <linux/dma-iommu.h> > > #define DRIVER_VERSION "0.2" > #define DRIVER_AUTHOR "Alex Williamson <[email protected]>" > @@ -1181,6 +1182,28 @@ static struct vfio_group *find_iommu_group(struct > vfio_domain *domain, > return NULL; > } > > +static bool vfio_iommu_has_resv_msi(struct iommu_group *group, > + phys_addr_t *base) > +{ > + struct list_head group_resv_regions; > + struct iommu_resv_region *region, *next; > + bool ret = false; > + > + INIT_LIST_HEAD(&group_resv_regions); > + iommu_get_group_resv_regions(group, &group_resv_regions); > + list_for_each_entry(region, &group_resv_regions, list) { > + if (region->type & IOMMU_RESV_MSI) { > + *base = region->start; > + ret = true; > + goto out; > + } > + } > +out: > + list_for_each_entry_safe(region, next, &group_resv_regions, list) > + kfree(region); > + return ret; > +} > + > static int vfio_iommu_type1_attach_group(void *iommu_data, > struct iommu_group *iommu_group) > { > @@ -1189,6 +1212,8 @@ static int vfio_iommu_type1_attach_group(void > *iommu_data, > struct vfio_domain *domain, *d; > struct bus_type *bus = NULL, *mdev_bus; > int ret; > + bool resv_msi; > + phys_addr_t resv_msi_base; > > mutex_lock(&iommu->lock); > > @@ -1258,6 +1283,8 @@ static int vfio_iommu_type1_attach_group(void > *iommu_data, > if (ret) > goto out_domain; > > + resv_msi = vfio_iommu_has_resv_msi(iommu_group, &resv_msi_base); > + > INIT_LIST_HEAD(&domain->group_list); > list_add(&group->next, &domain->group_list); > > @@ -1304,6 +1331,9 @@ static int vfio_iommu_type1_attach_group(void > *iommu_data, > if (ret) > goto out_detach; > > + if (resv_msi && iommu_get_msi_cookie(domain->domain, resv_msi_base)) > + goto out_detach; > + > list_add(&domain->next, &iommu->domain_list); > > mutex_unlock(&iommu->lock);
