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From: Ian Jackson <Ian.Jackson@eu.citrix.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: Keir Fraser <keir@xen.org>,
	ian.campbell@citrix.com,
	Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
	Tim Deegan <tim@xen.org>, Julien Grall <julien.grall@citrix.com>,
	xen-devel@lists.xenproject.org
Subject: Re: [PATCH 4/4] xen/public: arm: rework the macro set_xen_guest_handle_raw
Date: Wed, 4 Nov 2015 17:06:54 +0000	[thread overview]
Message-ID: <22074.15150.858323.658984@mariner.uk.xensource.com> (raw)
In-Reply-To: <563A48E902000078000B1E03@prv-mh.provo.novell.com>

Jan Beulich writes ("Re: [PATCH 4/4] xen/public: arm: rework the macro set_xen_guest_handle_raw"):
> On 04.11.15 at 17:50, <Ian.Jackson@eu.citrix.com> wrote:
> > If we don't provide a get_xen_guest_handle, a kernel developer will be
> > sorely tempted to make one.
> 
> What use would it be to them? Kernels only write handles, they
> shouldn't have a need for reading them.

I foresee situations where a kernel might like to update a proposed
hypercall argument structure in place, which might involve reading the
handles.

Ian.

  reply	other threads:[~2015-11-04 17:07 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-10-30 18:13 [PATCH 0/4] xen/public: arm: rework set_xen_guest_handle_raw Julien Grall
2015-10-30 18:13 ` [PATCH 1/4] xen/public: arm: Clarify the name of guest handle structures Julien Grall
2015-11-02 15:14   ` Stefano Stabellini
2015-10-30 18:13 ` [PATCH 2/4] xen/public: arm: Rework __guest_handle_param* Julien Grall
2015-11-02 15:19   ` Stefano Stabellini
2015-11-02 15:24     ` Julien Grall
2015-11-02 15:35       ` Ian Campbell
2015-11-02 15:39         ` Julien Grall
2015-11-02 15:49           ` Ian Campbell
2015-10-30 18:13 ` [PATCH 3/4] xen/public: Don't expose XEN_GUEST_HANDLE_PARAM outside of the hypervisor Julien Grall
2015-11-02 13:45   ` Jan Beulich
2015-11-02 13:52     ` Stefano Stabellini
2015-10-30 18:13 ` [PATCH 4/4] xen/public: arm: rework the macro set_xen_guest_handle_raw Julien Grall
2015-11-02 15:55   ` Stefano Stabellini
2015-11-02 16:15     ` Jan Beulich
2015-11-03 12:35     ` Ian Campbell
2015-11-03 14:01       ` Julien Grall
2015-11-03 14:34         ` Ian Campbell
2015-11-04 11:17           ` Julien Grall
2015-11-04 11:27             ` Ian Campbell
2015-11-04 11:40               ` Julien Grall
2015-11-04 14:29                 ` Ian Campbell
2015-11-04 14:42                   ` Julien Grall
2015-11-04 14:54                     ` Ian Campbell
2015-11-04 15:19                 ` Stefano Stabellini
2015-11-04 15:20                   ` Ian Jackson
2015-11-04 15:45                     ` Ian Jackson
2015-11-04 15:26                   ` Ian Campbell
2015-11-04 15:46                     ` Ian Jackson
2015-11-04 16:04                       ` Ian Campbell
2015-11-03 14:18   ` Stefano Stabellini
2015-11-03 15:25     ` Julien Grall
2015-11-04 16:22       ` Ian Jackson
2015-11-04 16:24         ` Ian Jackson
2015-11-04 16:39         ` Jan Beulich
2015-11-04 16:50           ` Ian Jackson
2015-11-04 16:59             ` Julien Grall
2015-11-04 17:05             ` Jan Beulich
2015-11-04 17:06               ` Ian Jackson [this message]
2015-11-05  8:37                 ` Jan Beulich
2015-11-06 12:10             ` Ian Campbell
2015-11-02 13:42 ` [PATCH 0/4] xen/public: arm: rework set_xen_guest_handle_raw Jan Beulich
2015-11-02 13:45   ` Julien Grall

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