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charset="utf-8" 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 --- drivers/vfio/vfio_iommu_type1.c | 23 ++++++++++++++++++++++- include/uapi/linux/vfio.h | 22 ++++++++++++++++++++++ 2 files changed, 44 insertions(+), 1 deletion(-) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type= 1.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_io= mmu *iommu, return ret; } =20 +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 =3D VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION; + cap_mig.header.version =3D 1; + + cap_mig.flags =3D 0; + /* support minimum pgsize */ + cap_mig.pgsize_bitmap =3D (size_t)1 << __ffs(iommu->pgsize_bitmap); + cap_mig.max_dirty_bitmap_size =3D 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, =20 info.iova_pgsizes =3D iommu->pgsize_bitmap; =20 - ret =3D vfio_iommu_iova_build_caps(iommu, &caps); + ret =3D vfio_iommu_migration_build_caps(iommu, &caps); + + if (!ret) + ret =3D vfio_iommu_iova_build_caps(iommu, &caps); + mutex_unlock(&iommu->lock); + if (ret) return ret; =20 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[]; }; =20 +/* + * The migration capability allows to report supported features for migrat= ion. + * + * 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 di= rty + * page tracking. + * max_dirty_bitmap_size: Kernel driver returns maximum supported dirty bi= tmap + * size in bytes to be used by user application for ioctls to get dirty bi= tmap. + */ +#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) =20 /** --=20 2.7.0