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authorKirti Wankhede <kwankhede@nvidia.com>2020-05-29 02:00:53 +0530
committerAlex Williamson <alex.williamson@redhat.com>2020-05-28 15:53:27 -0600
commitad721705d09c62f0d108a6b4f59867ebfd592c90 (patch)
treec45eb704dfd41afa87660600bcb246f4bca3c267 /drivers/vfio
parent331e33d2960c8292bad8b02578fcfac18f721517 (diff)
downloadlinux-ad721705d09c62f0d108a6b4f59867ebfd592c90.tar.bz2
vfio iommu: Add migration capability to report supported features
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> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: Yan Zhao <yan.y.zhao@intel.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/vfio')
-rw-r--r--drivers/vfio/vfio_iommu_type1.c23
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index e31fcc23e81a..f5c6ca46f165 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -2423,6 +2423,22 @@ 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)
{
@@ -2469,8 +2485,13 @@ 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;