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

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Message-ID: <CA+CK2bBUSN5N4XYepibbvakKFgkzEWwFN4DUMrufPtDrYBJvDQ@mail.gmail.com>
Date:   Wed, 20 Jan 2021 11:06:58 -0500
From:   Pavel Tatashin <pasha.tatashin@...een.com>
To:     Wei Liu <wei.liu@...nel.org>
Cc:     Linux on Hyper-V List <linux-hyperv@...r.kernel.org>,
        virtualization@...ts.linux-foundation.org,
        Linux Kernel List <linux-kernel@...r.kernel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Vineeth Pillai <viremana@...ux.microsoft.com>,
        Sunil Muthuswamy <sunilmut@...rosoft.com>,
        Nuno Das Neves <nunodasneves@...ux.microsoft.com>,
        "K. Y. 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

On Wed, Jan 20, 2021 at 7:01 AM Wei Liu <wei.liu@...nel.org> wrote:
>
> 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;
> +

Reviewed-by: Pavel Tatashin <pasha.tatashin@...een.com>