[PATCH Kernel v19 7/8] vfio iommu: Add migration capability to report supported features

[Kirti Wankhede]

Added migration capability in IOMMU info chain.
User application should check IOMMU info chain for migration capability
to use dirty page tracking feature provided by kernel module.
User application must check page sizes supported and maximum dirty
bitmap size returned by this capability structure for ioctls used to get
dirty bitmap.

Signed-off-by: Kirti Wankhede <address@hidden>
---
 drivers/vfio/vfio_iommu_type1.c | 24 +++++++++++++++++++++++-
 include/uapi/linux/vfio.h       | 21 +++++++++++++++++++++
 2 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 4358be26ff80..77351497a9c2 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -2389,6 +2389,22 @@ static int vfio_iommu_iova_build_caps(struct vfio_iommu 
*iommu,
        return ret;
 }
 
+static int vfio_iommu_migration_build_caps(struct vfio_iommu *iommu,
+                                          struct vfio_info_cap *caps)
+{
+       struct vfio_iommu_type1_info_cap_migration cap_mig;
+
+       cap_mig.header.id = VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION;
+       cap_mig.header.version = 1;
+       cap_mig.flags = VFIO_IOMMU_INFO_CAPS_MIGRATION_DIRTY_PAGE_TRACK;
+
+       /* support minimum pgsize */
+       cap_mig.pgsize_bitmap = (size_t)1 << __ffs(iommu->pgsize_bitmap);
+       cap_mig.max_dirty_bitmap_size = DIRTY_BITMAP_SIZE_MAX;
+
+       return vfio_info_add_capability(caps, &cap_mig.header, sizeof(cap_mig));
+}
+
 static long vfio_iommu_type1_ioctl(void *iommu_data,
                                   unsigned int cmd, unsigned long arg)
 {
@@ -2433,10 +2449,16 @@ static long vfio_iommu_type1_ioctl(void *iommu_data,
                mutex_lock(&iommu->lock);
                info.flags = VFIO_IOMMU_INFO_PGSIZES;
 
+               vfio_pgsize_bitmap(iommu);
                info.iova_pgsizes = iommu->pgsize_bitmap;
 
-               ret = vfio_iommu_iova_build_caps(iommu, &caps);
+               ret = vfio_iommu_migration_build_caps(iommu, &caps);
+
+               if (!ret)
+                       ret = vfio_iommu_iova_build_caps(iommu, &caps);
+
                mutex_unlock(&iommu->lock);
+
                if (ret)
                        return ret;
 
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index e3cbf8b78623..c90604322798 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -1013,6 +1013,27 @@ struct vfio_iommu_type1_info_cap_iova_range {
        struct  vfio_iova_range iova_ranges[];
 };
 
+/*
+ * The migration capability allows to report supported features for migration.
+ *
+ * The structures below define version 1 of this capability.
+ *
+ * pgsize_bitmap: Kernel driver returns supported page sizes bitmap for dirty
+ * page tracking.
+ * max_dirty_bitmap_size: Kernel driver returns maximum supported dirty bitmap
+ * size in bytes to be used by user application for ioctls to get dirty bitmap.
+ */
+#define VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION  1
+
+struct vfio_iommu_type1_info_cap_migration {
+       struct  vfio_info_cap_header header;
+       __u32   flags;
+       /* supports dirty page tracking */
+#define VFIO_IOMMU_INFO_CAPS_MIGRATION_DIRTY_PAGE_TRACK        (1 << 0)
+       __u64   pgsize_bitmap;
+       __u64   max_dirty_bitmap_size;          /* in bytes */
+};
+
 #define VFIO_IOMMU_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 12)
 
 /**
-- 
2.7.0