During live migration of a virtual machine, the SR-IOV VF need to be
re-registered. It may fail when the memory is badly fragmented.

The related log is as follows.

    kernel: hv_netvsc 6045bdaa-c0d1-6045-bdaa-c0d16045bdaa eth0: VF slot 1 added
...
    kernel: kworker/0:0: page allocation failure: order:7, mode:0x40dc0(GFP_KERNEL|__GFP_COMP|__GFP_ZERO), nodemask=(null),cpuset=/,mems_allowed=0
    kernel: CPU: 0 PID: 24006 Comm: kworker/0:0 Tainted: G            E     5.4...x86_64 #1
    kernel: Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090008  12/07/2018
    kernel: Workqueue: events work_for_cpu_fn
    kernel: Call Trace:
    kernel: dump_stack+0x8b/0xc8
    kernel: warn_alloc+0xff/0x170
    kernel: __alloc_pages_slowpath+0x92c/0xb2b
    kernel: ? get_page_from_freelist+0x1d4/0x1140
    kernel: __alloc_pages_nodemask+0x2f9/0x320
    kernel: alloc_pages_current+0x6a/0xb0
    kernel: kmalloc_order+0x1e/0x70
    kernel: kmalloc_order_trace+0x26/0xb0
    kernel: ? __switch_to_asm+0x34/0x70
    kernel: __kmalloc+0x276/0x280
    kernel: ? _raw_spin_unlock_irqrestore+0x1e/0x40
    kernel: devlink_alloc+0x29/0x110
    kernel: mlx5_devlink_alloc+0x1a/0x20 [mlx5_core]
    kernel: init_one+0x1d/0x650 [mlx5_core]
    kernel: local_pci_probe+0x46/0x90
    kernel: work_for_cpu_fn+0x1a/0x30
    kernel: process_one_work+0x16d/0x390
    kernel: worker_thread+0x1d3/0x3f0
    kernel: kthread+0x105/0x140
    kernel: ? max_active_store+0x80/0x80
    kernel: ? kthread_bind+0x20/0x20
    kernel: ret_from_fork+0x3a/0x50
Signed-off-by: Jian Wen <wenjian1@xiaomi.com>
Link: https://lore.kernel.org/r/20240327082128.942818-1-wenjian1@xiaomi.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>