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

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Message-ID: <eb53647a-dbf4-ace4-3cf8-a55c1fbb0c7a@amazon.com>
Date:   Mon, 7 Dec 2020 21:18:02 +0200
From:   "Paraschiv, Andra-Irina" <andraprs@...zon.com>
To:     Stefano Garzarella <sgarzare@...hat.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



On 07/12/2020 12:05, Stefano Garzarella wrote:
>
> 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.

Thanks, Stefano, for review and checking it out for the nested case as well.

I'll send out v3 including the addressed feedback and the Rb tags.

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

Ok, np, thanks for the heads-up.

Andra



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