[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [PATCH Kernel v23 4/8] vfio iommu: Add ioctl definition for dirty pa
From: |
Cornelia Huck |
Subject: |
Re: [PATCH Kernel v23 4/8] vfio iommu: Add ioctl definition for dirty pages tracking |
Date: |
Mon, 25 May 2020 16:41:17 +0200 |
On Wed, 20 May 2020 23:38:04 +0530
Kirti Wankhede <address@hidden> wrote:
> IOMMU container maintains a list of all pages pinned by vfio_pin_pages API.
> All pages pinned by vendor driver through this API should be considered as
> dirty during migration. When container consists of IOMMU capable device and
> all pages are pinned and mapped, then all pages are marked dirty.
> Added support to start/stop dirtied pages tracking and to get bitmap of all
> dirtied pages for requested IO virtual address range.
>
> Signed-off-by: Kirti Wankhede <address@hidden>
> Reviewed-by: Neo Jia <address@hidden>
> ---
> include/uapi/linux/vfio.h | 56
> +++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 56 insertions(+)
(...)
> +/**
> + * VFIO_IOMMU_DIRTY_PAGES - _IOWR(VFIO_TYPE, VFIO_BASE + 17,
> + * struct vfio_iommu_type1_dirty_bitmap)
> + * IOCTL is used for dirty pages logging.
> + * Caller should set flag depending on which operation to perform, details as
> + * below:
> + *
> + * Calling the IOCTL with VFIO_IOMMU_DIRTY_PAGES_FLAG_START flag set,
> instructs
> + * the IOMMU driver to log pages that are dirtied or potentially dirtied by
> + * device; designed to be used when a migration is in progress. Dirty pages
> are
s/device/the device/
> + * loggeded until logging is disabled by user application by calling the
> IOCTL
s/loggeded/logged/
> + * with VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP flag.
> + *
> + * Calling the IOCTL with VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP flag set,
> instructs
> + * the IOMMU driver to stop logging dirtied pages.
> + *
> + * Calling the IOCTL with VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP flag set
> + * returns the dirty pages bitmap for IOMMU container for a given IOVA range.
> + * User must specify the IOVA range and the pgsize through the structure
s/User/The user/
> + * vfio_iommu_type1_dirty_bitmap_get in the data[] portion. This interface
> + * supports to get bitmap of smallest supported pgsize only and can be
> modified
s/to get/getting a/
s/smallest/the smallest/
> + * in future to get bitmap of specified pgsize. The user must provide a
> zeroed
"a bitmap of any specified supported pgsize" ?
> + * memory area for the bitmap memory and specify its size in bitmap.size.
> + * One bit is used to represent one page consecutively starting from iova
> + * offset. The user should provide page size in bitmap.pgsize field. A bit
> set
> + * in the bitmap indicates that the page at that offset from iova is dirty.
> + * The caller must set argsz to a value including the size of structure
> + * vfio_iommu_type1_dirty_bitmap_get, but excluding the size of the actual
> + * bitmap. If dirty pages logging is not enabled, an error will be returned.
(...)
With the nits fixed,
Reviewed-by: Cornelia Huck <address@hidden>
- [PATCH Kernel v23 0/8] Add UAPIs to support migration for VFIO devices, Kirti Wankhede, 2020/05/20
- [PATCH Kernel v23 1/8] vfio: UAPI for migration interface for device state, Kirti Wankhede, 2020/05/20
- [PATCH Kernel v23 2/8] vfio iommu: Remove atomicity of ref_count of pinned pages, Kirti Wankhede, 2020/05/20
- [PATCH Kernel v23 3/8] vfio iommu: Cache pgsize_bitmap in struct vfio_iommu, Kirti Wankhede, 2020/05/20
- [PATCH Kernel v23 4/8] vfio iommu: Add ioctl definition for dirty pages tracking, Kirti Wankhede, 2020/05/20
- Re: [PATCH Kernel v23 4/8] vfio iommu: Add ioctl definition for dirty pages tracking,
Cornelia Huck <=
- [PATCH Kernel v23 6/8] vfio iommu: Update UNMAP_DMA ioctl to get dirty bitmap before unmap, Kirti Wankhede, 2020/05/20
- [PATCH Kernel v23 5/8] vfio iommu: Implementation of ioctl for dirty pages tracking, Kirti Wankhede, 2020/05/20
- [PATCH Kernel v23 7/8] vfio iommu: Add migration capability to report supported features, Kirti Wankhede, 2020/05/20
- [PATCH Kernel v23 8/8] vfio: Selective dirty page tracking if IOMMU backed device pins pages, Kirti Wankhede, 2020/05/20
- Re: [PATCH Kernel v23 0/8] Add UAPIs to support migration for VFIO devices, Yan Zhao, 2020/05/28