Boqun Feng <boqun.feng@xxxxxxxxx> writes: > 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> > --- > 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. Tested-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> Thanks! -- Vitaly
