From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Vrabel <david.vrabel@citrix.com>
Subject: Re: [PATCH] x86/hvm: Allow the guest to permit the use
 of userspace hypercalls
Date: Mon, 11 Jan 2016 18:26:01 +0000
Message-ID: <5693F3B9.5060407@citrix.com>
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To: Andrew Cooper <andrew.cooper3@citrix.com>, Jan Beulich <JBeulich@suse.com>
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On 11/01/16 17:17, Andrew Cooper wrote:
> So from one point of view, sufficient justification for this change is
> "because the Linux way isn't the only valid way to do this".

"Because we can" isn't a good justification for adding something new.
Particularly something that is trivially easy to (accidentally) misuse
and open a big security hole between userspace and kernel.

The vague idea for a userspace netfront that's floating around
internally is also not a good reason for pushing this feature at this time.

David