From: Daniel De Graaf <dgdegra@tycho.nsa.gov>
To: Jan Beulich <JBeulich@suse.com>
Cc: xen-devel@lists.xensource.com
Subject: Re: [PATCH] xenbus: Add support for xenbus backend in stub domain
Date: Thu, 12 Jan 2012 10:58:58 -0500 [thread overview]
Message-ID: <4F0F0342.7080105@tycho.nsa.gov> (raw)
In-Reply-To: <4F0F0CE3020000780006C27E@nat28.tlf.novell.com>
On 01/12/2012 10:40 AM, Jan Beulich wrote:
>>>> On 12.01.12 at 16:28, Daniel De Graaf <dgdegra@tycho.nsa.gov> wrote:
>> On 01/12/2012 03:59 AM, Jan Beulich wrote:
>>>>>> On 11.01.12 at 18:22, Daniel De Graaf <dgdegra@tycho.nsa.gov> wrote:
>>>> This adds two ioctls to the /dev/xen/xenbus_backend device allowing the
>>>> xenbus backend to be started after the kernel has booted. This is
>>>> intended to allow dom0 to start another domain to run xenstore.
>>>>
>>>> IOCTL_XENBUS_BACKEND_REMOTE_SETUP requires that the xenstore domain be
>>>> started; the domain ID is passed as the ioctl argument. This sets up a
>>>> listening event channel and grant reference to xenbus, but does not
>>>> start using this interface. It returns the local event channel port.
>>>
>>> Any chance to get at least the setup part matched with the
>>> legacy Linux implementation (defining IOCTL_XENBUS_ALLOC)?
>>>
>>> Jan
>>
>> From what I can tell, the legacy ioctl cannot restore watches because the
>> return value must be used to set up xenstore communication before they can
>> be used.
>
> Then I must have missed something. But this was the only kernel side
> patch, wasn't it?
>
> Is the intended behavior then to have a Dom0-based xenstored
> starting first, then do a brain transfer to that running in a stub
> domain? That certainly wasn't the behavior of what the legacy
> Linux implementation was intended for...
>
>> Or were you just asking if IOCTL_XENBUS_BACKEND_REMOTE_SETUP's parameter
>> can be changed to xenbus_alloc_t? That structure could be populated in the
>> same way as the legacy implementation, but it wouldn't give any more
>> information than the current ioctl does.
>
> No, if it functionally differs, then we really should just care that
> the ioctl numbers don't collide.
>
> Jan
>
I think this depends on how the xenstore domain is constructed: if it is
started instead of the dom0-based xenstored (not the current method, but
converting init-xenstored to create the domain itself should make this
possible) then the setup/commit split of the ioctl is not needed. In that
case the older ioctl name/interface can be preserved (although the grant
field will always be populated with 1).
--
Daniel De Graaf
National Security Agency
next prev parent reply other threads:[~2012-01-12 15:58 UTC|newest]
Thread overview: 129+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-11 17:21 [RFC PATCH 0/18] Xenstore stub domain Daniel De Graaf
2012-01-11 17:21 ` [PATCH 01/18] xen: reinstate previously unused XENMEM_remove_from_physmap hypercall Daniel De Graaf
2012-01-12 8:22 ` Jan Beulich
2012-01-11 17:21 ` [PATCH 02/18] xen: allow global VIRQ handlers to be delegated to other domains Daniel De Graaf
2012-01-12 8:43 ` Jan Beulich
2012-01-11 17:21 ` [PATCH 03/18] xsm: allow use of XEN_DOMCTL_getdomaininfo by non-IS_PRIV domains Daniel De Graaf
2012-01-11 17:27 ` Keir Fraser
2012-01-11 17:36 ` Daniel De Graaf
2012-01-11 17:49 ` Keir Fraser
2012-01-11 17:21 ` [PATCH 04/18] xen: Preserve reserved grant entries when switching versions Daniel De Graaf
2012-01-12 8:53 ` Jan Beulich
2012-01-12 9:49 ` Ian Campbell
2012-01-12 9:56 ` Ian Campbell
2012-01-11 17:21 ` [PATCH 05/18] tools/libxl: Add xenstore and console backend domain IDs to config Daniel De Graaf
2012-01-11 17:21 ` [PATCH 06/18] lib{xc, xl}: Seed grant tables with xenstore and console grants Daniel De Graaf
2012-01-12 9:59 ` Ian Campbell
2012-01-12 15:11 ` Daniel De Graaf
2012-01-12 16:12 ` Ian Campbell
2012-01-12 17:21 ` Ian Jackson
2012-01-12 17:32 ` Daniel De Graaf
2012-01-12 17:35 ` Ian Jackson
2012-01-12 17:38 ` Ian Campbell
2012-01-12 17:47 ` Daniel De Graaf
2012-01-11 17:21 ` [PATCH 07/18] mini-os: avoid crash if no console is provided Daniel De Graaf
2012-01-12 10:03 ` Ian Campbell
2012-01-12 17:56 ` Daniel De Graaf
2012-01-18 10:21 ` Ian Campbell
2012-01-11 17:21 ` [PATCH 08/18] mini-os: avoid crash if no xenstore " Daniel De Graaf
2012-01-11 17:21 ` [PATCH 09/18] mini-os: remove per-fd evtchn limit Daniel De Graaf
2012-01-11 17:21 ` [PATCH 10/18] xenstored: use grant references instead of map_foreign_range Daniel De Graaf
2012-01-11 17:21 ` [PATCH 11/18] xenstored: add NO_SOCKETS compilation option Daniel De Graaf
2012-01-12 10:05 ` Ian Campbell
2012-01-11 17:21 ` [PATCH 12/18] xenstored support for in-memory rather than FS based trivial DB (needed to run on mini-OS) Daniel De Graaf
2012-01-11 17:21 ` [PATCH 13/18] xenstored: support running in minios stubdom Daniel De Graaf
2012-01-11 17:21 ` [PATCH 14/18] xenstored: always use xc_gnttab_munmap in stubdom Daniel De Graaf
2012-01-11 17:21 ` [PATCH 15/18] xenstored: add --event parameter for bootstrapping Daniel De Graaf
2012-01-11 17:21 ` [PATCH 16/18] xenstored: pull dom0 event port from shared page Daniel De Graaf
2012-01-11 17:21 ` [PATCH 17/18] xenstored: use domain_is_unprivileged instead of checking conn->id Daniel De Graaf
2012-01-11 17:21 ` [PATCH 18/18] xenstored: add --priv-domid parameter Daniel De Graaf
2012-01-12 10:20 ` Ian Campbell
2012-01-12 15:37 ` Daniel De Graaf
2012-01-11 17:22 ` [PATCH] xenbus: Add support for xenbus backend in stub domain Daniel De Graaf
2012-01-12 8:59 ` Jan Beulich
2012-01-12 15:28 ` Daniel De Graaf
2012-01-12 15:40 ` Jan Beulich
2012-01-12 15:58 ` Daniel De Graaf [this message]
2012-01-12 9:51 ` [RFC PATCH 0/18] Xenstore " Ian Campbell
2012-01-12 9:57 ` Ian Campbell
2012-01-12 23:32 ` Daniel De Graaf
2012-01-12 10:33 ` Joanna Rutkowska
2012-01-12 10:48 ` Tim Deegan
2012-01-12 11:18 ` On Dom0 disaggregation (was: Re: [RFC PATCH 0/18] Xenstore stub domain) Joanna Rutkowska
2012-01-12 12:13 ` Tim Deegan
2012-01-12 13:30 ` On Dom0 disaggregation Joanna Rutkowska
2012-01-12 14:21 ` Tim Deegan
2012-01-12 14:23 ` Mihir Nanavati
2012-01-12 11:27 ` [RFC PATCH 0/18] Xenstore stub domain Ian Campbell
2012-01-12 11:33 ` Vasiliy Tolstov
2012-01-12 11:46 ` Ian Campbell
2012-01-12 11:35 ` Joanna Rutkowska
2012-01-12 11:46 ` Ian Campbell
2012-01-12 11:00 ` Keir Fraser
2012-01-12 16:12 ` Daniel De Graaf
2012-01-12 23:35 ` [PATCH v2 00/18] " Daniel De Graaf
2012-01-12 23:35 ` [PATCH 01/18] xen: reinstate previously unused XENMEM_remove_from_physmap hypercall Daniel De Graaf
2012-01-13 7:56 ` Jan Beulich
2012-01-18 10:36 ` Ian Campbell
2012-01-18 14:56 ` Daniel De Graaf
2012-01-18 16:06 ` Ian Campbell
2012-01-18 19:07 ` Daniel De Graaf
2012-01-19 10:32 ` Ian Campbell
2012-01-12 23:35 ` [PATCH 02/18] xen: allow global VIRQ handlers to be delegated to other domains Daniel De Graaf
2012-01-13 8:03 ` Jan Beulich
2012-01-13 13:58 ` Daniel De Graaf
2012-01-13 15:32 ` Jan Beulich
2012-01-18 10:39 ` Ian Campbell
2012-01-18 11:28 ` Jan Beulich
2012-01-18 11:44 ` Ian Campbell
2012-01-12 23:35 ` [PATCH 03/18] xen: use XSM instead of IS_PRIV for getdomaininfo Daniel De Graaf
2012-01-12 23:35 ` [PATCH 04/18] xen: Preserve reserved grant entries when switching versions Daniel De Graaf
2012-01-13 8:07 ` Jan Beulich
2012-01-18 10:43 ` Ian Campbell
2012-01-12 23:35 ` [PATCH 05/18] tools/libxl: pull xenstore/console domids from xenstore Daniel De Graaf
2012-01-18 10:47 ` Ian Campbell
2012-01-12 23:35 ` [PATCH 06/18] lib{xc, xl}: Seed grant tables with xenstore and console grants Daniel De Graaf
2012-01-18 11:05 ` Ian Campbell
2012-01-20 20:24 ` Daniel De Graaf
2012-01-12 23:35 ` [PATCH 07/18] mini-os: avoid crash if no console is provided Daniel De Graaf
2012-01-18 11:06 ` Ian Campbell
2012-01-12 23:35 ` [PATCH 08/18] mini-os: avoid crash if no xenstore " Daniel De Graaf
2012-01-18 11:08 ` Ian Campbell
2012-01-12 23:35 ` [PATCH 09/18] mini-os: remove per-fd evtchn limit Daniel De Graaf
2012-01-18 11:10 ` Ian Campbell
2012-01-12 23:35 ` [PATCH 10/18] xenstored: use grant references instead of map_foreign_range Daniel De Graaf
2012-01-18 11:15 ` Ian Campbell
2012-01-18 18:18 ` Daniel De Graaf
2012-01-12 23:35 ` [PATCH 11/18] xenstored: add NO_SOCKETS compilation option Daniel De Graaf
2012-01-18 11:23 ` Ian Campbell
2012-01-12 23:35 ` [PATCH 12/18] xenstored support for in-memory rather than FS based trivial DB (needed to run on mini-OS) Daniel De Graaf
2012-01-18 11:27 ` Ian Campbell
2012-01-12 23:35 ` [PATCH 13/18] xenstored: support running in minios stubdom Daniel De Graaf
2012-01-18 11:33 ` Ian Campbell
2012-01-18 17:13 ` Ian Jackson
2012-01-18 17:35 ` Ian Campbell
2012-01-24 16:24 ` Ian Jackson
2012-01-12 23:35 ` [PATCH 14/18] xenstored: always use xc_gnttab_munmap in stubdom Daniel De Graaf
2012-01-12 23:35 ` [PATCH 15/18] xenstored: add --event parameter for bootstrapping Daniel De Graaf
2012-01-18 11:35 ` Ian Campbell
2012-01-12 23:35 ` [PATCH 16/18] xenstored: use domain_is_unprivileged instead of checking conn->id Daniel De Graaf
2012-01-18 11:44 ` Ian Campbell
2012-01-18 18:31 ` Daniel De Graaf
2012-01-12 23:35 ` [PATCH 17/18] xenstored: add --priv-domid parameter Daniel De Graaf
2012-01-18 11:48 ` Ian Campbell
2012-01-18 14:41 ` Daniel De Graaf
2012-01-18 14:47 ` Ian Campbell
2012-01-12 23:35 ` [PATCH 18/18] xenstored: Add stub domain builder Daniel De Graaf
2012-01-18 11:50 ` Ian Campbell
2012-01-12 23:36 ` [PATCH] xenbus: Add support for xenbus backend in stub domain Daniel De Graaf
2012-01-13 8:20 ` Jan Beulich
2012-01-13 14:06 ` Daniel De Graaf
2012-01-13 15:37 ` Jan Beulich
2012-01-13 15:44 ` Daniel De Graaf
2012-01-13 16:00 ` Jan Beulich
2012-01-13 17:42 ` Daniel De Graaf
2012-01-16 8:19 ` Jan Beulich
2012-01-18 12:07 ` Ian Campbell
2012-01-18 14:44 ` Daniel De Graaf
2012-01-18 10:23 ` [PATCH v2 00/18] Xenstore " Ian Campbell
-- strict thread matches above, loose matches on Subject: below --
2012-01-20 20:47 [PATCH v3 00/21] " Daniel De Graaf
2012-01-20 20:47 ` [PATCH] xenbus: Add support for xenbus backend in " Daniel De Graaf
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