Linux Virtualization - Jan 2021 - [PATCH v5 03/16] Drivers: hv: vmbus: skip VMBus initialization if Linux is root

From: Wei Liu <wei.liu at kernel.org> Sent: Wednesday, January 20, 2021
4:01 AM
> 
> There is no VMBus and the other infrastructures initialized in
> hv_acpi_init when Linux is running as the root partition.
> 
> Signed-off-by: Wei Liu <wei.liu at kernel.org>
> ---
> v3: Return 0 instead of -ENODEV.
> ---
>  drivers/hv/vmbus_drv.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
> index 502f8cd95f6d..ee27b3670a51 100644
> --- a/drivers/hv/vmbus_drv.c
> +++ b/drivers/hv/vmbus_drv.c
> @@ -2620,6 +2620,9 @@ static int __init hv_acpi_init(void)
>  	if (!hv_is_hyperv_initialized())
>  		return -ENODEV;
> 
> +	if (hv_root_partition)
> +		return 0;
> +
>  	init_completion(&probe_event);
> 
>  	/*
> --
> 2.20.1
Reviewed-by: Michael Kelley <mikelley at microsoft.com>