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| author | Boqun Feng <boqun.feng@gmail.com> | 2021-11-01 18:00:26 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-11-25 11:48:46 +0300 |
| commit | cd198aea9e8dc1a16a40ed52a6a4d42be470c151 (patch) | |
| tree | 9817af3457025c2825082b8ffed9c9a73dd380c4 | |
| parent | d8f574fb5eb2c604aaacb0fafb756c7d9f610d57 (diff) | |
| download | linux-cd198aea9e8dc1a16a40ed52a6a4d42be470c151.tar.xz | |
Drivers: hv: balloon: Use VMBUS_RING_SIZE() wrapper for dm_ring_size
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@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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/hv/hv_balloon.c | 2 |
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. |