linux-kernel - RE: [PATCH v5 03/16] Drivers: hv: vmbus: skip VMBus initialization if Linux is root

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Message-ID: <MWHPR21MB1593BE5FD96AF79193D6EAC9D7BC9@MWHPR21MB1593.namprd21.prod.outlook.com>
Date:   Tue, 26 Jan 2021 00:32:36 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     Wei Liu <wei.liu@...nel.org>,
        Linux on Hyper-V List <linux-hyperv@...r.kernel.org>
CC:     "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        Linux Kernel List <linux-kernel@...r.kernel.org>,
        Vineeth Pillai <viremana@...ux.microsoft.com>,
        Sunil Muthuswamy <sunilmut@...rosoft.com>,
        Nuno Das Neves <nunodasneves@...ux.microsoft.com>,
        "pasha.tatashin@...een.com" <pasha.tatashin@...een.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>
Subject: RE: [PATCH v5 03/16] Drivers: hv: vmbus: skip VMBus initialization if
 Linux is root

From: Wei Liu <wei.liu@...nel.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@...nel.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@...rosoft.com>