Add new vfio ioctl VFIO_DEVICE_PCI_GET_DIRTY_BITMAP to fetch the dirty
page bitmap from mdev device driver for data sync during live migration.
Signed-off-by: Yulei Zhang <yulei.zh...@intel.com>
---
drivers/gpu/drm/i915/gvt/kvmgt.c | 33 +++++++++++++++++++++++++++++++++
include/uapi/linux/vfio.h | 14 ++++++++++++++
2 files changed, 47 insertions(+)
diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index ac327f7..e9f11a9 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -919,6 +919,24 @@ static int intel_vgpu_set_irqs(struct intel_vgpu *vgpu,
uint32_t flags,
return func(vgpu, index, start, count, flags, data);
}
+static void intel_vgpu_update_dirty_bitmap(struct intel_vgpu *vgpu, u64
start_addr,
+ u64 page_nr, void *bitmap)
+{
+ u64 gfn = start_addr >> GTT_PAGE_SHIFT;
+ struct intel_vgpu_guest_page *p;
+ int i;
+
+ for (i = 0; i < page_nr; i++) {
+ hash_for_each_possible(vgpu->gtt.guest_page_hash_table,
+ p, node, gfn) {
+ if (p->gfn == gfn)
+ set_bit(i, bitmap);
+ }
+ gfn++;
+ }
+
+}
+
static long intel_vgpu_ioctl(struct mdev_device *mdev, unsigned int cmd,
unsigned long arg)
{
@@ -1156,6 +1174,21 @@ static long intel_vgpu_ioctl(struct mdev_device *mdev,
unsigned int cmd,
intel_gvt_ops->vgpu_deactivate(vgpu);
else
intel_gvt_ops->vgpu_activate(vgpu);
+ } else if (cmd == VFIO_DEVICE_PCI_GET_DIRTY_BITMAP) {
+ struct vfio_pci_get_dirty_bitmap d;
+ unsigned long bitmap_sz;
+ unsigned *bitmap;
+ minsz = offsetofend(struct vfio_pci_get_dirty_bitmap, page_nr);
+ if (copy_from_user(&d, (void __user *)arg, minsz))
+ return -EFAULT;
+ bitmap_sz = (BITS_TO_LONGS(d.page_nr) + 1) * sizeof(unsigned
long);
+ bitmap = vzalloc(bitmap_sz);
+ intel_vgpu_update_dirty_bitmap(vgpu, d.start_addr, d.page_nr,
bitmap);
+ if (copy_to_user((void __user*)arg + minsz, bitmap, bitmap_sz))
{
+ vfree(bitmap);
+ return -EFAULT;
+ }
+ vfree(bitmap);
}
return 0;
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 4bb057d..544cf93 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -518,6 +518,20 @@ struct vfio_pci_status_set{
#define VFIO_DEVICE_PCI_STATUS_SET _IO(VFIO_TYPE, VFIO_BASE + 14)
+/**
+ * VFIO_DEVICE_PCI_GET_DIRTY_BITMAP - _IOW(VFIO_TYPE, VFIO_BASE + 15,
+ * struct vfio_pci_get_dirty_bitmap)
+ *
+ * Return: 0 on success, -errno on failure.
+ */
+struct vfio_pci_get_dirty_bitmap{
+ __u64 start_addr;
+ __u64 page_nr;
+ __u8 dirty_bitmap[];
+};
+
+#define VFIO_DEVICE_PCI_GET_DIRTY_BITMAP _IO(VFIO_TYPE, VFIO_BASE + 15)
+
/* -------- API for Type1 VFIO IOMMU -------- */
/**
--
2.7.4
