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Commit 8a7eb2d4 authored by Boqun Feng's avatar Boqun Feng Committed by Wei Liu
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Drivers: hv: balloon: Use VMBUS_RING_SIZE() wrapper for dm_ring_size



Baihua reported an error when boot an ARM64 guest with PAGE_SIZE=64k and
BALLOON is enabled:

	hv_vmbus: registering driver hv_balloon
	hv_vmbus: probe failed for device 1eccfd72-4b41-45ef-b73a-4a6e44c12924 (-22)

The cause of this is that the ringbuffer size for hv_balloon is not
adjusted with VMBUS_RING_SIZE(), which makes the size not large enough
for ringbuffers on guest with PAGE_SIZE=64k. Therefore use
VMBUS_RING_SIZE() to calculate the ringbuffer size. Note that the old
size (20 * 1024) counts a 4k header in the total size, while
VMBUS_RING_SIZE() expects the parameter as the payload size, so use
16 * 1024.

Cc: <stable@vger.kernel.org> # 5.15.x
Reported-by: default avatarBaihua Lu <baihua.lu@microsoft.com>
Signed-off-by: default avatarBoqun Feng <boqun.feng@gmail.com>
Tested-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Link: https://lore.kernel.org/r/20211101150026.736124-1-boqun.feng@gmail.com


Signed-off-by: default avatarWei Liu <wei.liu@kernel.org>
parent fa55b7dc
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