Commit 0e3f7293 authored by Junichi Uekawa's avatar Junichi Uekawa Committed by Jakub Kicinski
Browse files

vhost/vsock: Use kvmalloc/kvfree for larger packets. 



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: 433fc58e ("VSOCK: Introduce vhost_vsock.ko")
Signed-off-by: default avatarJunichi Uekawa <uekawa@chromium.org>
Reviewed-by: default avatarStefano Garzarella <sgarzare@redhat.com>
Acked-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Link: https://lore.kernel.org/r/20220928064538.667678-1-uekawa@chromium.org


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 511cce16

drivers/vhost/vsock.c

+1 −1
Original line number Diff line number Diff line
@@ -393,7 +393,7 @@ vhost_vsock_alloc_pkt(struct vhost_virtqueue *vq, 
		return NULL;

	}



	pkt->buf = kmalloc(pkt->len, GFP_KERNEL);

	pkt->buf = kvmalloc(pkt->len, GFP_KERNEL);

	if (!pkt->buf) {

		kfree(pkt);

		return NULL;

net/vmw_vsock/virtio_transport_common.c

+1 −1
Original line number Diff line number Diff line
@@ -1342,7 +1342,7 @@ EXPORT_SYMBOL_GPL(virtio_transport_recv_pkt); 


void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt)

{

	kfree(pkt->buf);

	kvfree(pkt->buf);

	kfree(pkt);

}

EXPORT_SYMBOL_GPL(virtio_transport_free_pkt);