This is a note to let you know that I've just added the patch titled
Drivers: hv: balloon: Use VMBUS_RING_SIZE() wrapper for dm_ring_size
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drivers-hv-balloon-use-vmbus_ring_size-wrapper-for-dm_ring_size.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8a7eb2d476c6823cd44d8c25a6230a52417d7ef8 Mon Sep 17 00:00:00 2001
From: Boqun Feng <boqun.feng@xxxxxxxxx>
Date: Mon, 1 Nov 2021 23:00:26 +0800
Subject: Drivers: hv: balloon: Use VMBUS_RING_SIZE() wrapper for dm_ring_size
From: Boqun Feng <boqun.feng@xxxxxxxxx>
commit 8a7eb2d476c6823cd44d8c25a6230a52417d7ef8 upstream.
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@xxxxxxxxxxxxxxx> # 5.15.x
Reported-by: Baihua Lu <baihua.lu@xxxxxxxxxxxxx>
Signed-off-by: Boqun Feng <boqun.feng@xxxxxxxxx>
Tested-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20211101150026.736124-1-boqun.feng@xxxxxxxxx
Signed-off-by: Wei Liu <wei.liu@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hv/hv_balloon.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -480,7 +480,7 @@ module_param(pressure_report_delay, uint
MODULE_PARM_DESC(pressure_report_delay, "Delay in secs in reporting pressure");
static atomic_t trans_id = ATOMIC_INIT(0);
-static int dm_ring_size = 20 * 1024;
+static int dm_ring_size = VMBUS_RING_SIZE(16 * 1024);
/*
* Driver specific state.
Patches currently in stable-queue which might be from boqun.feng@xxxxxxxxx are
queue-5.15/drivers-hv-balloon-use-vmbus_ring_size-wrapper-for-dm_ring_size.patch
