netdev - Re: [net-next 1/2] xen-netback: add module parameter to disable ctrl-ring

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <YFeso1fr1hLxi3lR@lunn.ch>
Date:   Sun, 21 Mar 2021 21:29:23 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     "Hsu, Chiahao" <andyhsu@...zon.com>
Cc:     Leon Romanovsky <leon@...nel.org>, netdev@...r.kernel.org,
        wei.liu@...nel.org, paul@....org, davem@...emloft.net,
        kuba@...nel.org, xen-devel@...ts.xenproject.org
Subject: Re: [net-next 1/2] xen-netback: add module parameter to disable
 ctrl-ring

> > At the end, it will be more granular module parameter that user still
> > will need to guess.
> I believe users always need to know any parameter or any tool's flag before
> they use it.
> For example, before user try to set/clear this ctrl_ring_enabled, they
> should already have basic knowledge about this feature,
> or else they shouldn't use it (the default value is same as before), and
> that's also why we use the 'ctrl_ring_enabled' as parameter name.

To me, it seems you are fixing this problem in the wrong place. As a
VM user in the cloud, i have no idea how the cloud provider needs the
VM configured to allow the cloud provider to migrate the VM to
somewhere else in the bitbarn. As the VM user, it should not be my
problem. I would expect the cloud provider to configure the VM host to
only expose facilities to the VM which allows it to be migrated.

This is a VM host problem, not a VM problem.

     Andrew