vhost_scsi_open() allocates one "struct vhost_scsi_virtqueue" for each virtqueue. With large max_io_vqs values, this array can require a high-order contiguous allocation and trigger a page allocator warning.
hv# cat /sys/module/vhost_scsi/parameters/max_io_vqs 256 [ 766.075787] ------------[ cut here ]------------ [ 766.077030] WARNING: mm/page_alloc.c:5280 at __alloc_frozen_pages_noprof+0x32c/0x15c0, CPU#23: qemu-system-x86/5964 ... ... [ 766.080351] RIP: 0010:__alloc_frozen_pages_noprof+0x32c/0x15c0 ... ... [ 766.085813] Call Trace: [ 766.085969] <TASK> [ 766.086098] ? srso_alias_return_thunk+0x5/0xfbef5 [ 766.086365] ? context_struct_compute_av+0x38a/0x4b0 [ 766.086652] alloc_pages_mpol+0x9f/0x170 [ 766.086883] ___kmalloc_large_node+0xb6/0xd0 [ 766.087124] ? srso_alias_return_thunk+0x5/0xfbef5 [ 766.087389] __kmalloc_large_node_noprof+0x18/0xa0 [ 766.087655] __kmalloc_noprof+0x3a0/0x440 [ 766.087877] ? vhost_scsi_open+0xcb/0x2d0 [vhost_scsi] [ 766.088162] vhost_scsi_open+0xcb/0x2d0 [vhost_scsi] [ 766.088449] misc_open+0x123/0x160 [ 766.088679] chrdev_open+0xb1/0x230 [ 766.088885] ? __pfx_chrdev_open+0x10/0x10 [ 766.089157] do_dentry_open+0x11a/0x470 [ 766.089389] vfs_open+0x29/0xf0 [ 766.089596] path_openat+0x7c0/0x1100 [ 766.089821] do_file_open+0xdd/0x190 [ 766.090032] ? srso_alias_return_thunk+0x5/0xfbef5 [ 766.090332] do_sys_openat2+0x7e/0x100 [ 766.090601] __x64_sys_openat+0x51/0xa0 [ 766.090857] do_syscall_64+0xfe/0x590 [ 766.091087] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 766.091411] RIP: 0033:0x7f9525a11fa6 The array does not require physical contiguity, so allocate it with kvzalloc_objs() and free it with kvfree(). Signed-off-by: Dongli Zhang <[email protected]> --- drivers/vhost/scsi.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c index 9a1253b9d8c5..0c0634eea144 100644 --- a/drivers/vhost/scsi.c +++ b/drivers/vhost/scsi.c @@ -2295,7 +2295,7 @@ static int vhost_scsi_open(struct inode *inode, struct file *f) if (!vs->old_inflight) goto err_inflight; - vs->vqs = kmalloc_objs(*vs->vqs, nvqs, GFP_KERNEL | __GFP_ZERO); + vs->vqs = kvzalloc_objs(*vs->vqs, nvqs); if (!vs->vqs) goto err_vqs; @@ -2331,7 +2331,7 @@ static int vhost_scsi_open(struct inode *inode, struct file *f) return 0; err_local_vqs: - kfree(vs->vqs); + kvfree(vs->vqs); err_vqs: kfree(vs->old_inflight); err_inflight: @@ -2352,7 +2352,7 @@ static int vhost_scsi_release(struct inode *inode, struct file *f) vhost_dev_stop(&vs->dev); vhost_dev_cleanup(&vs->dev); kfree(vs->dev.vqs); - kfree(vs->vqs); + kvfree(vs->vqs); kfree(vs->old_inflight); kvfree(vs); return 0; -- 2.43.5
