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[PATCH v9 QEMU 03/15] vfio iommu: Add ioctl defination to unmap IOVA and
From: |
Kirti Wankhede |
Subject: |
[PATCH v9 QEMU 03/15] vfio iommu: Add ioctl defination to unmap IOVA and return dirty bitmap |
Date: |
Tue, 12 Nov 2019 22:35:12 +0530 |
With vIOMMU, during pre-copy phase of migration, while CPUs are still
running, IO virtual address unmap can happen while device still keeping
reference of guest pfns. Those pages should be reported as dirty before
unmap, so that VFIO user space application can copy content of those pages
from source to destination.
IOCTL defination added here add bitmap pointer, size and flag. If flag
VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP is set and bitmap memory is allocated
and bitmap_size of set, then ioctl will create bitmap of pinned pages and
then unmap those.
Signed-off-by: Kirti Wankhede <address@hidden>
Reviewed-by: Neo Jia <address@hidden>
---
linux-headers/linux/vfio.h | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/linux-headers/linux/vfio.h b/linux-headers/linux/vfio.h
index 2b00c732f313..520e952e3daf 100644
--- a/linux-headers/linux/vfio.h
+++ b/linux-headers/linux/vfio.h
@@ -925,6 +925,39 @@ struct vfio_iommu_type1_dirty_bitmap {
#define VFIO_IOMMU_GET_DIRTY_BITMAP _IO(VFIO_TYPE, VFIO_BASE + 17)
+/**
+ * VFIO_IOMMU_UNMAP_DMA_GET_BITMAP - _IOWR(VFIO_TYPE, VFIO_BASE + 18,
+ struct vfio_iommu_type1_dma_unmap_bitmap)
+ *
+ * Unmap IO virtual addresses using the provided struct
+ * vfio_iommu_type1_dma_unmap_bitmap. Caller sets argsz.
+ * VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP should be set to get dirty bitmap
+ * before unmapping IO virtual addresses. If this flag is not set, only IO
+ * virtual address are unmapped, that is, behave same as VFIO_IOMMU_UNMAP_DMA
+ * ioctl.
+ * User should allocate memory to get bitmap and should set size of allocated
+ * memory in bitmap_size field. One bit is used to represent per page
+ * consecutively starting from iova offset. Bit set indicates page at that
+ * offset from iova is dirty.
+ * The actual unmapped size is returned in the size field and bitmap of pages
+ * in the range of unmapped size is retuned in bitmap if flag
+ * VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP if set.
+ *
+ * No guarantee is made to the user that arbitrary unmaps of iova or size
+ * different from those used in the original mapping call will succeed.
+ */
+struct vfio_iommu_type1_dma_unmap_bitmap {
+ __u32 argsz;
+ __u32 flags;
+#define VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP (1 << 0)
+ __u64 iova; /* IO virtual address */
+ __u64 size; /* Size of mapping (bytes) */
+ __u64 bitmap_size; /* in bytes */
+ void *bitmap; /* one bit per page */
+};
+
+#define VFIO_IOMMU_UNMAP_DMA_GET_BITMAP _IO(VFIO_TYPE, VFIO_BASE + 18)
+
/* -------- Additional API for SPAPR TCE (Server POWERPC) IOMMU -------- */
/*
--
2.7.0
- [PATCH v9 Qemu 00/15] Add migration support for VFIO devices, Kirti Wankhede, 2019/11/12
- [PATCH v9 QEMU 01/15] vfio: KABI for migration interface for device state, Kirti Wankhede, 2019/11/12
- [PATCH v9 QEMU 02/15] vfio iommu: Add ioctl defination to get dirty pages bitmap., Kirti Wankhede, 2019/11/12
- [PATCH v9 QEMU 03/15] vfio iommu: Add ioctl defination to unmap IOVA and return dirty bitmap,
Kirti Wankhede <=
- [PATCH v9 QEMU 04/15] vfio: Add function to unmap VFIO region, Kirti Wankhede, 2019/11/12
- [PATCH v9 QEMU 05/15] vfio: Add vfio_get_object callback to VFIODeviceOps, Kirti Wankhede, 2019/11/12
- [PATCH v9 QEMU 06/15] vfio: Add save and load functions for VFIO PCI devices, Kirti Wankhede, 2019/11/12
- [PATCH v9 QEMU 07/15] vfio: Add migration region initialization and finalize function, Kirti Wankhede, 2019/11/12
- [PATCH v9 QEMU 08/15] vfio: Add VM state change handler to know state of VM, Kirti Wankhede, 2019/11/12
- [PATCH v9 QEMU 09/15] vfio: Add migration state change notifier, Kirti Wankhede, 2019/11/12
- [PATCH v9 QEMU 10/15] vfio: Register SaveVMHandlers for VFIO device, Kirti Wankhede, 2019/11/12