vfio/type1: Allow transparent MSI IOVA allocation

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 <eric.auger@redhat.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Tomasz Nowicki <tomasz.nowicki@caviumnetworks.com>
Tested-by: Tomasz Nowicki <tomasz.nowicki@caviumnetworks.com>
Tested-by: Bharat Bhushan <bharat.bhushan@nxp.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 9266271..5651faf 100644 (file)
--- 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 <alex.williamson@redhat.com>"
@@ -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);