linux-kernel - Re: [PATCH net-next v2 0/4] vsock: Add flags field in the vsock address

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Message-ID: <20201207100525.v4z7rlewnwubjphu@steredhat>
Date:   Mon, 7 Dec 2020 11:05:25 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Andra Paraschiv <andraprs@...zon.com>
Cc:     netdev <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        David Duncan <davdunc@...zon.com>,
        Dexuan Cui <decui@...rosoft.com>,
        Alexander Graf <graf@...zon.de>,
        Jorgen Hansen <jhansen@...are.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: Re: [PATCH net-next v2 0/4] vsock: Add flags field in the vsock
 address

Hi Andra,

On Fri, Dec 04, 2020 at 07:02:31PM +0200, Andra Paraschiv wrote:
>vsock enables communication between virtual machines and the host they are
>running on. Nested VMs can be setup to use vsock channels, as the multi
>transport support has been available in the mainline since the v5.5 Linux kernel
>has been released.
>
>Implicitly, if no host->guest vsock transport is loaded, all the vsock packets
>are forwarded to the host. This behavior can be used to setup communication
>channels between sibling VMs that are running on the same host. One example can
>be the vsock channels that can be established within AWS Nitro Enclaves
>(see Documentation/virt/ne_overview.rst).
>
>To be able to explicitly mark a connection as being used for a certain use case,
>add a flags field in the vsock address data structure. The "svm_reserved1" field
>has been repurposed to be the flags field. The value of the flags will then be
>taken into consideration when the vsock transport is assigned. This way can
>distinguish between different use cases, such as nested VMs / local communication
>and sibling VMs.

the series seems in a good shape, I left some minor comments.
I run my test suite (vsock_test, iperf3, nc) with nested VMs (QEMU/KVM), 
and everything looks good.

Note: I'll be offline today and tomorrow, so I may miss followups.

Thanks,
Stefano