linux-kernel - RE: [PATCH hyperv-next v4 16/16] Drivers: hv: Set the default VMBus version to 6.0

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Message-ID:
 <SN6PR02MB4157729EF896F0941E71DA47D45CA@SN6PR02MB4157.namprd02.prod.outlook.com>
Date: Tue, 22 Jul 2025 17:45:30 +0000
From: Michael Kelley <mhklinux@...look.com>
To: Roman Kisel <romank@...ux.microsoft.com>, "alok.a.tiwari@...cle.com"
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CC: "apais@...rosoft.com" <apais@...rosoft.com>, "benhill@...rosoft.com"
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Subject: RE: [PATCH hyperv-next v4 16/16] Drivers: hv: Set the default VMBus
 version to 6.0

From: Roman Kisel <romank@...ux.microsoft.com> Sent: Monday, July 14, 2025 3:16 PM
> 
> The confidential VMBus is supported by the protocol version
> 6.0 onwards.
> 
> Attempt to establish the VMBus 6.0 connection thus enabling
> the confidential VMBus features when available.
> 
> Signed-off-by: Roman Kisel <romank@...ux.microsoft.com>
> ---
>  drivers/hv/connection.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
> index eeb472019d69..7cd43463f969 100644
> --- a/drivers/hv/connection.c
> +++ b/drivers/hv/connection.c
> @@ -51,6 +51,7 @@ EXPORT_SYMBOL_GPL(vmbus_proto_version);
>   * Linux guests and are not listed.
>   */
>  static __u32 vmbus_versions[] = {
> +	VERSION_WIN10_V6_0,
>  	VERSION_WIN10_V5_3,
>  	VERSION_WIN10_V5_2,
>  	VERSION_WIN10_V5_1,
> @@ -65,7 +66,7 @@ static __u32 vmbus_versions[] = {
>   * Maximal VMBus protocol version guests can negotiate.  Useful to cap the
>   * VMBus version for testing and debugging purpose.
>   */
> -static uint max_version = VERSION_WIN10_V5_3;
> +static uint max_version = VERSION_WIN10_V6_0;
> 
>  module_param(max_version, uint, S_IRUGO);
>  MODULE_PARM_DESC(max_version,
> --
> 2.43.0

Reviewed-by: Michael Kelley <mhklinux@...look.com>