We introduce a vfio_dma type since we will need to discriminate
different types of dma slots:
- VFIO_IOVA_USER: IOVA region used to map user vaddr
- VFIO_IOVA_RESERVED_MSI: IOVA region reserved to map MSI doorbells

Signed-off-by: Eric Auger <eric.au...@redhat.com>
Acked-by: Alex Williamson <alex.william...@redhat.com>

---
v9 -> v10:
- renamed VFIO_IOVA_RESERVED into VFIO_IOVA_RESERVED_MSI
- explicitly set type to VFIO_IOVA_USER on dma_map

v6 -> v7:
- add VFIO_IOVA_ANY
- do not introduce yet any VFIO_IOVA_RESERVED handling
---
 drivers/vfio/vfio_iommu_type1.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 2ba1942..a9f8b93 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -53,6 +53,12 @@ module_param_named(disable_hugepages,
 MODULE_PARM_DESC(disable_hugepages,
                 "Disable VFIO IOMMU support for IOMMU hugepages.");
 
+enum vfio_iova_type {
+       VFIO_IOVA_USER = 0,     /* standard IOVA used to map user vaddr */
+       VFIO_IOVA_RESERVED_MSI, /* reserved to map MSI doorbells */
+       VFIO_IOVA_ANY,          /* matches any IOVA type */
+};
+
 struct vfio_iommu {
        struct list_head        domain_list;
        struct mutex            lock;
@@ -75,6 +81,7 @@ struct vfio_dma {
        unsigned long           vaddr;          /* Process virtual addr */
        size_t                  size;           /* Map size (bytes) */
        int                     prot;           /* IOMMU_READ/WRITE */
+       enum vfio_iova_type     type;           /* type of IOVA */
 };
 
 struct vfio_group {
@@ -607,6 +614,7 @@ static int vfio_dma_do_map(struct vfio_iommu *iommu,
        dma->iova = iova;
        dma->vaddr = vaddr;
        dma->prot = prot;
+       dma->type = VFIO_IOVA_USER;
 
        /* Insert zero-sized and grow as we map chunks of it */
        vfio_link_dma(iommu, dma);
-- 
1.9.1

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