linux-kernel - RE: [PATCH v2 1/3] Drivers: hv: vmbus: Introduce and negotiate VMBus protocol version 5.3

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Date:   Wed, 14 Apr 2021 18:25:26 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     "Andrea Parri (Microsoft)" <parri.andrea@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>
Subject: RE: [PATCH v2 1/3] Drivers: hv: vmbus: Introduce and negotiate VMBus
 protocol version 5.3

From: Andrea Parri (Microsoft) <parri.andrea@...il.com> Sent: Wednesday, April 14, 2021 8:01 AM
> 
> Hyper-V has added VMBus protocol version 5.3.  Allow Linux guests to
> negotiate the new version on version of Hyper-V that support it.
> 
> Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@...il.com>
> ---
>  drivers/hv/connection.c | 3 ++-
>  include/linux/hyperv.h  | 2 ++
>  2 files changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
> index 350e8c5cafa8c..dc19d5ae4373c 100644
> --- a/drivers/hv/connection.c
> +++ b/drivers/hv/connection.c
> @@ -45,6 +45,7 @@ EXPORT_SYMBOL_GPL(vmbus_proto_version);
>   * Table of VMBus versions listed from newest to oldest.
>   */
>  static __u32 vmbus_versions[] = {
> +	VERSION_WIN10_V5_3,
>  	VERSION_WIN10_V5_2,
>  	VERSION_WIN10_V5_1,
>  	VERSION_WIN10_V5,
> @@ -60,7 +61,7 @@ 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_2;
> +static uint max_version = VERSION_WIN10_V5_3;
> 
>  module_param(max_version, uint, S_IRUGO);
>  MODULE_PARM_DESC(max_version,
> diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
> index 2c18c8e768efe..d6a6f76040b5f 100644
> --- a/include/linux/hyperv.h
> +++ b/include/linux/hyperv.h
> @@ -234,6 +234,7 @@ static inline u32 hv_get_avail_to_write_percent(
>   * 5 . 0  (Newer Windows 10)
>   * 5 . 1  (Windows 10 RS4)
>   * 5 . 2  (Windows Server 2019, RS5)
> + * 5 . 3  (Windows Server 2021) // FIXME: use proper version number/name

The official name is now public information as "Windows Server 2022".

>   */
> 
>  #define VERSION_WS2008  ((0 << 16) | (13))
> @@ -245,6 +246,7 @@ static inline u32 hv_get_avail_to_write_percent(
>  #define VERSION_WIN10_V5 ((5 << 16) | (0))
>  #define VERSION_WIN10_V5_1 ((5 << 16) | (1))
>  #define VERSION_WIN10_V5_2 ((5 << 16) | (2))
> +#define VERSION_WIN10_V5_3 ((5 << 16) | (3))
> 
>  /* Make maximum size of pipe payload of 16K */
>  #define MAX_PIPE_DATA_PAYLOAD		(sizeof(u8) * 16384)
> --
> 2.25.1