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From: David Vrabel <david.vrabel@citrix.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>,
	Jan Beulich <JBeulich@suse.com>
Cc: StefanoStabellini <stefano.stabellini@citrix.com>,
	Ian Campbell <ian.campbell@citrix.com>,
	Xen-devel <xen-devel@lists.xen.org>
Subject: Re: [PATCH] x86/hvm: Allow the guest to permit the use of userspace hypercalls
Date: Mon, 11 Jan 2016 18:26:01 +0000	[thread overview]
Message-ID: <5693F3B9.5060407@citrix.com> (raw)
In-Reply-To: <5693E3BD.6070009@citrix.com>

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

  reply	other threads:[~2016-01-11 18:26 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-11 13:59 [PATCH] x86/hvm: Allow the guest to permit the use of userspace hypercalls Andrew Cooper
2016-01-11 14:32 ` Paul Durrant
2016-01-11 14:44 ` Jan Beulich
2016-01-11 17:17   ` Andrew Cooper
2016-01-11 18:26     ` David Vrabel [this message]
2016-01-11 18:32       ` Andrew Cooper
2016-01-11 18:40         ` David Vrabel
2016-01-11 18:50           ` Andrew Cooper
2016-01-12 12:07       ` Stefano Stabellini
2016-01-12 15:06         ` Jan Beulich
2016-01-12 17:05           ` Stefano Stabellini
2016-01-12 17:10             ` Juergen Gross
2016-01-12 17:23               ` Stefano Stabellini
2016-01-13  5:12                 ` Juergen Gross
2016-01-13 10:41                   ` Stefano Stabellini
2016-01-13 11:14                     ` Juergen Gross
2016-01-13 11:26                       ` Stefano Stabellini
2016-01-13 11:32                         ` Juergen Gross
2016-01-13 11:42         ` David Vrabel
2016-01-13 12:51           ` Stefano Stabellini
2016-01-12  7:33     ` Jan Beulich
2016-01-12 10:57       ` Andrew Cooper
2016-01-12 11:03         ` George Dunlap
2016-01-14 10:50 ` Ian Campbell

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