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Date:   Mon, 7 Dec 2020 10:59:05 +0100
From:   Stefano Garzarella <>
To:     Andra Paraschiv <>
Cc:     netdev <>,
        linux-kernel <>,
        "David S . Miller" <>,
        David Duncan <>,
        Dexuan Cui <>,
        Alexander Graf <>,
        Jorgen Hansen <>,
        Jakub Kicinski <>,
        Stefan Hajnoczi <>,
        Vitaly Kuznetsov <>
Subject: Re: [PATCH net-next v2 1/4] vm_sockets: Include flags field in the
 vsock address data structure

On Fri, Dec 04, 2020 at 07:02:32PM +0200, Andra Paraschiv wrote:
>vsock enables communication between virtual machines and the host they
>are running on. With the multi transport support (guest->host and
>host->guest), nested VMs can also use vsock channels for communication.
>In addition to this, by default, all the vsock packets are forwarded to
>the host, if no host->guest transport is loaded. This behavior can be
>implicitly used for enabling vsock communication between sibling VMs.
>Add a flags field in the vsock address data structure that can be used
>to explicitly mark the vsock connection as being targeted for a certain
>type of communication. This way, can distinguish between different use
>cases such as nested VMs and sibling VMs.
>Use the already available "svm_reserved1" field and mark it as a flags
>field instead. This field can be set when initializing the vsock address
>variable used for the connect() call.
>v1 -> v2
>* Update the field name to "svm_flags".
>* Split the current patch in 2 patches.

Usually the changelog goes after the 3 dashes, but I'm not sure there is 
a strict rule :-)

Anyway the patch LGTM:

Reviewed-by: Stefano Garzarella <>

>Signed-off-by: Andra Paraschiv <>
> include/uapi/linux/vm_sockets.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>diff --git a/include/uapi/linux/vm_sockets.h b/include/uapi/linux/vm_sockets.h
>index fd0ed7221645d..46735376a57a8 100644
>--- a/include/uapi/linux/vm_sockets.h
>+++ b/include/uapi/linux/vm_sockets.h
>@@ -145,7 +145,7 @@
> struct sockaddr_vm {
> 	__kernel_sa_family_t svm_family;
>-	unsigned short svm_reserved1;
>+	unsigned short svm_flags;
> 	unsigned int svm_port;
> 	unsigned int svm_cid;
> 	unsigned char svm_zero[sizeof(struct sockaddr) -
>2.20.1 (Apple Git-117)
>Amazon Development Center (Romania) S.R.L. registered office: 27A Sf. Lazar Street, UBC5, floor 2, Iasi, Iasi County, 700045, Romania. Registered in Romania. Registration number J22/2621/2005.

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