diff mbox series

[Kernel,v20,7/8] vfio iommu: Add migration capability to report supported features

Message ID 1589488667-9683-8-git-send-email-kwankhede@nvidia.com (mailing list archive)
State New, archived
Headers show
Series Add UAPIs to support migration for VFIO devices | expand

Commit Message

Kirti Wankhede May 14, 2020, 8:37 p.m. UTC 
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 <kwankhede@nvidia.com>
---
 drivers/vfio/vfio_iommu_type1.c | 23 ++++++++++++++++++++++-
 include/uapi/linux/vfio.h       | 22 ++++++++++++++++++++++
 2 files changed, 44 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index a1dc57bcece5..3edb3c3e6170 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -2387,6 +2387,22 @@  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 = 0;
+	/* 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)
 {
@@ -2433,8 +2449,13 @@  static long vfio_iommu_type1_ioctl(void *iommu_data,
 
 		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 0a0c7315ddd6..ab1d0150bbd3 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -1013,6 +1013,28 @@  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.
+ *
+ * The existence of this capability indicates IOMMU kernel driver supports
+ * dirty page tracking.
+ *
+ * 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;
+	__u64	pgsize_bitmap;
+	__u64	max_dirty_bitmap_size;		/* in bytes */
+};
+
 #define VFIO_IOMMU_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 12)
 
 /**