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From: Boqun Feng <boqun.feng@gmail.com>
To: linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: "K. Y. Srinivasan" <kys@microsoft.com>,
	Haiyang Zhang <haiyangz@microsoft.com>,
	Stephen Hemminger <sthemmin@microsoft.com>,
	Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
	Boqun Feng <boqun.feng@gmail.com>,
	stable@vger.kernel.org, Baihua Lu <baihua.lu@microsoft.com>
Subject: [PATCH] Drivers: hv: balloon: Use VMBUS_RING_SIZE() wrapper for dm_ring_size
Date: Mon,  1 Nov 2021 23:00:26 +0800	[thread overview]
Message-ID: <20211101150026.736124-1-boqun.feng@gmail.com> (raw)

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: Baihua Lu <baihua.lu@microsoft.com>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
---
 drivers/hv/hv_balloon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index 7f11ea07d698..ca873a3b98db 100644
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -480,7 +480,7 @@ module_param(pressure_report_delay, uint, (S_IRUGO | S_IWUSR));
 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.
-- 
2.33.0


             reply	other threads:[~2021-11-01 15:01 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-01 15:00 Boqun Feng [this message]
2021-11-02 13:03 ` [PATCH] Drivers: hv: balloon: Use VMBUS_RING_SIZE() wrapper for dm_ring_size Vitaly Kuznetsov
2021-11-04 12:18   ` Wei Liu

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