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From: Stefano Garzarella <sgarzare@redhat.com>
To: Andra Paraschiv <andraprs@amazon.com>
Cc: netdev <netdev@vger.kernel.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	"David S . Miller" <davem@davemloft.net>,
	David Duncan <davdunc@amazon.com>,
	Dexuan Cui <decui@microsoft.com>, Alexander Graf <graf@amazon.de>,
	Jorgen Hansen <jhansen@vmware.com>,
	Jakub Kicinski <kuba@kernel.org>,
	Stefan Hajnoczi <stefanha@redhat.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>
Subject: Re: [PATCH net-next v2 0/4] vsock: Add flags field in the vsock address
Date: Mon, 7 Dec 2020 11:05:25 +0100	[thread overview]
Message-ID: <20201207100525.v4z7rlewnwubjphu@steredhat> (raw)
In-Reply-To: <20201204170235.84387-1-andraprs@amazon.com>

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


  parent reply	other threads:[~2020-12-07 10:07 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-04 17:02 Andra Paraschiv
2020-12-04 17:02 ` [PATCH net-next v2 1/4] vm_sockets: Include flags field in the vsock address data structure Andra Paraschiv
2020-12-07  9:59   ` Stefano Garzarella
2020-12-07 19:25     ` Paraschiv, Andra-Irina
2020-12-07 21:29   ` Jakub Kicinski
2020-12-08 18:23     ` Paraschiv, Andra-Irina
2020-12-08 18:42       ` Jakub Kicinski
2020-12-09 10:48         ` Stefano Garzarella
2020-12-09 15:17           ` Paraschiv, Andra-Irina
2020-12-09 17:30             ` Jakub Kicinski
2020-12-10 15:29               ` Paraschiv, Andra-Irina
2020-12-04 17:02 ` [PATCH net-next v2 2/4] vm_sockets: Add VMADDR_FLAG_TO_HOST vsock flag Andra Paraschiv
2020-12-07  9:59   ` Stefano Garzarella
2020-12-07 19:45     ` Paraschiv, Andra-Irina
2020-12-04 17:02 ` [PATCH net-next v2 3/4] af_vsock: Set VMADDR_FLAG_TO_HOST flag on the receive path Andra Paraschiv
2020-12-07  9:59   ` Stefano Garzarella
2020-12-04 17:02 ` [PATCH net-next v2 4/4] af_vsock: Assign the vsock transport considering the vsock address flags Andra Paraschiv
2020-12-07 10:00   ` Stefano Garzarella
2020-12-07 19:51     ` Paraschiv, Andra-Irina
2020-12-07 10:05 ` Stefano Garzarella [this message]
2020-12-07 19:18   ` [PATCH net-next v2 0/4] vsock: Add flags field in the vsock address Paraschiv, Andra-Irina

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