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authorBoqun Feng <boqun.feng@gmail.com>2021-11-01 23:00:26 +0800
committerWei Liu <wei.liu@kernel.org>2021-11-15 12:35:56 +0000
commit8a7eb2d476c6823cd44d8c25a6230a52417d7ef8 (patch)
tree2e76b82414d922a8205b6db8689f2b32af52f956 /drivers/hv
parentfa55b7dcdc43c1aa1ba12bca9d2dd4318c2a0dbf (diff)
downloadlinux-8a7eb2d476c6823cd44d8c25a6230a52417d7ef8.tar.bz2
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: Baihua Lu <baihua.lu@microsoft.com> Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Tested-by: Vitaly Kuznetsov <vkuznets@redhat.com> Link: https://lore.kernel.org/r/20211101150026.736124-1-boqun.feng@gmail.com Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'drivers/hv')
-rw-r--r--drivers/hv/hv_balloon.c2
1 files changed, 1 insertions, 1 deletions
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.