RDMA/irdma: Use kvzalloc for lvl2 leafmem allocation

During VM live migration or when registering large memory regions
(e.g., guest memory >= 256 GB backed by 4 KiB pages), get_lvl2_pble()
calculates total leaves exceeding ~131,072. The memory required for
lvl2->leafmem.va exceeds 4 MiB (sizeof(*leaf) * total > 5.24 MiB).

Because kzalloc() requires physically contiguous pages, requests larger
than MAX_PAGE_ORDER (4 MiB on x86_64) fail and trigger a warning:

  WARNING: CPU: 123 PID: 119906 at mm/page_alloc.c:5997 __alloc_frozen_pages_noprof+0x50c/0x1050
  Call Trace:
   <TASK>
   alloc_frozen_pages_noprof+0xc0/0x240
   ___kmalloc_large_node+0x3d/0xd0
   __kmalloc_large_node_noprof+0x1b/0x90
   __kmalloc_noprof+0x254/0x660
   get_lvl1_lvl2_pble+0xbc/0x270 [irdma]
   irdma_get_pble+0x44/0xc0 [irdma]
   irdma_setup_pbles+0x46/0x1d0 [irdma]
   irdma_reg_user_mr_type_mem+0x41/0x230 [irdma]
   irdma_reg_user_mr+0x194/0x1c0 [irdma]
   ib_uverbs_reg_mr+0x1b0/0x2c0 [ib_uverbs]

The leafmem array is purely host software tracking structures (struct
irdma_pble_info) and does not require physically contiguous memory.

Switch the allocation from kzalloc() to kvzalloc() and free it with
kvfree() so that requests exceeding MAX_PAGE_ORDER fall back to
virtually contiguous memory via vmalloc.

Fixes: e8c4dbc2fcac ("RDMA/irdma: Add PBLE resource manager")
Assisted-by: LLM
Signed-off-by: Jeremy Bongio <jbongio@google.com>
Link: https://patch.msgid.link/20260916173203.2555458-1-jbongio@google.com
Tested-by: Jacob Moroni <jmoroni@google.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>

0 files changed, 0 insertions, 0 deletions