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Junichi Uekawa 0d720c3f0a vhost/vsock: Use kvmalloc/kvfree for larger packets. 
[ Upstream commit 0e3f72931fc47bb81686020cc643cde5d9cd0bb8 ]

When copying a large file over sftp over vsock, data size is usually 32kB,
and kmalloc seems to fail to try to allocate 32 32kB regions.

 vhost-5837: page allocation failure: order:4, mode:0x24040c0
 Call Trace:
  [<ffffffffb6a0df64>] dump_stack+0x97/0xdb
  [<ffffffffb68d6aed>] warn_alloc_failed+0x10f/0x138
  [<ffffffffb68d868a>] ? __alloc_pages_direct_compact+0x38/0xc8
  [<ffffffffb664619f>] __alloc_pages_nodemask+0x84c/0x90d
  [<ffffffffb6646e56>] alloc_kmem_pages+0x17/0x19
  [<ffffffffb6653a26>] kmalloc_order_trace+0x2b/0xdb
  [<ffffffffb66682f3>] __kmalloc+0x177/0x1f7
  [<ffffffffb66e0d94>] ? copy_from_iter+0x8d/0x31d
  [<ffffffffc0689ab7>] vhost_vsock_handle_tx_kick+0x1fa/0x301 [vhost_vsock]
  [<ffffffffc06828d9>] vhost_worker+0xf7/0x157 [vhost]
  [<ffffffffb683ddce>] kthread+0xfd/0x105
  [<ffffffffc06827e2>] ? vhost_dev_set_owner+0x22e/0x22e [vhost]
  [<ffffffffb683dcd1>] ? flush_kthread_worker+0xf3/0xf3
  [<ffffffffb6eb332e>] ret_from_fork+0x4e/0x80
  [<ffffffffb683dcd1>] ? flush_kthread_worker+0xf3/0xf3

Work around by doing kvmalloc instead.

Fixes: 433fc58e6b ("VSOCK: Introduce vhost_vsock.ko")
Signed-off-by: Junichi Uekawa <uekawa@chromium.org>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Link: https://lore.kernel.org/r/20220928064538.667678-1-uekawa@chromium.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-10-26 13:17:00 +02:00
..
Kconfig
Kconfig.vringh
Makefile
net.c vhost_net: fix ubuf refcount incorrectly when sendmsg fails 2021-01-12 20:09:08 +01:00
scsi.c vhost: scsi: add weight support 2019-07-10 09:54:42 +02:00
test.c vhost/test: fix build for vhost test 2019-09-16 08:20:45 +02:00
test.h
vhost.c vhost: Fix the calculation in vhost_overflow() 2021-08-26 08:37:08 -04:00
vhost.h vhost: introduce vhost_exceeds_weight() 2019-07-10 09:54:42 +02:00
vringh.c vringh: Fix loop descriptors check in the indirect cases 2022-06-14 16:54:01 +02:00
vsock.c vhost/vsock: Use kvmalloc/kvfree for larger packets. 2022-10-26 13:17:00 +02:00