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| author | David Vrabel <david.vrabel@citrix.com> | 2013-10-14 10:25:39 +0200 |
|---|---|---|
| committer | Jan Beulich <jbeulich@suse.com> | 2013-10-14 10:25:39 +0200 |
| commit | a77eb86f44e52c5aea7f0ba7023600c043a9cdcd (patch) | |
| tree | f999a21db3c0a9f170ce107b5a609ba2c74c1e6e /docs | |
| parent | 783b9e67f963bbb068b68fea4426131858145b0f (diff) | |
| download | xen-a77eb86f44e52c5aea7f0ba7023600c043a9cdcd.tar.gz xen-a77eb86f44e52c5aea7f0ba7023600c043a9cdcd.tar.bz2 xen-a77eb86f44e52c5aea7f0ba7023600c043a9cdcd.zip | |
libxl,xl: add max_event_channels option to xl configuration file
Add the 'max_event_channels' option to the xl configuration file to
limit the number of event channels that domain may use.
Plumb this option through to libxl via a new libxl_build_info field
and call xc_domain_set_max_evtchn() in the post build stage of domain
creation.
A new LIBXL_HAVE_BUILDINFO_EVENT_CHANNELS #define indicates that this
new field is available.
The default value of 1023 limits the domain to using the minimum
amount of global mapping pages and at most 5 xenheap pages.
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Keir Fraser <keir@xen.org>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/man/xl.cfg.pod.5 | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/docs/man/xl.cfg.pod.5 b/docs/man/xl.cfg.pod.5 index cd9696934b..278dba10d8 100644 --- a/docs/man/xl.cfg.pod.5 +++ b/docs/man/xl.cfg.pod.5 @@ -580,6 +580,17 @@ Allow a guest to access specific physical IRQs. It is recommended to use this option only for trusted VMs under administrator control. +=item B<max_event_channels=N> + +Limit the guest to using at most N event channels (PV interrupts). +Guests use hypervisor resources for each event channel they use. + +The default of 1023 should be sufficient for typical guests. The +maximum value depends what the guest supports. Guests supporting the +FIFO-based event channel ABI support up to 131,071 event channels. +Other guests are limited to 4095 (64-bit x86 and ARM) or 1023 (32-bit +x86). + =back =head2 Paravirtualised (PV) Guest Specific Options |