linux-kernel - [PATCH 5.15 231/279] Drivers: hv: balloon: Use VMBUS_RING_SIZE() wrapper for dm_ring

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Message-Id: <20211124115726.722941546@linuxfoundation.org>
Date:   Wed, 24 Nov 2021 12:58:38 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Baihua Lu <baihua.lu@...rosoft.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wei Liu <wei.liu@...nel.org>
Subject: [PATCH 5.15 231/279] Drivers: hv: balloon: Use VMBUS_RING_SIZE() wrapper for dm_ring_size

From: Boqun Feng <boqun.feng@...il.com>

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@...r.kernel.org> # 5.15.x
Reported-by: Baihua Lu <baihua.lu@...rosoft.com>
Signed-off-by: Boqun Feng <boqun.feng@...il.com>
Tested-by: Vitaly Kuznetsov <vkuznets@...hat.com>
Link: https://lore.kernel.org/r/20211101150026.736124-1-boqun.feng@gmail.com
Signed-off-by: Wei Liu <wei.liu@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 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.