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authorBharata B Rao <bharata@linux.vnet.ibm.com>2015-07-02 16:23:15 +1000
committerAlexander Graf <agraf@suse.de>2015-07-07 17:44:51 +0200
commitdb4ef288f4a6d285b39dc8ac477092d76971a300 (patch)
tree30935beaab5fbca18a62162d20bf2f16e33ae393 /docs
parent9e734e3deefd460188ea9bd107b65a528ccb7255 (diff)
spapr: Support ibm, lrdr-capacity device tree property
Add support for ibm,lrdr-capacity since this is needed by the guest kernel to know about the possible hot-pluggable CPUs and Memory. With this, pseries kernels will start reporting correct maxcpus in /sys/devices/system/cpu/possible. Also define the minimum hotpluggable memory size as 256MB. Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> [agraf: Fix compile error on 32bit hosts] Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'docs')
-rw-r--r--docs/specs/ppc-spapr-hotplug.txt18
1 files changed, 18 insertions, 0 deletions
diff --git a/docs/specs/ppc-spapr-hotplug.txt b/docs/specs/ppc-spapr-hotplug.txt
index d35771cc2b..46e07196bb 100644
--- a/docs/specs/ppc-spapr-hotplug.txt
+++ b/docs/specs/ppc-spapr-hotplug.txt
@@ -284,4 +284,22 @@ struct rtas_event_log_v6_hp {
} drc;
} QEMU_PACKED;
+== ibm,lrdr-capacity ==
+
+ibm,lrdr-capacity is a property in the /rtas device tree node that identifies
+the dynamic reconfiguration capabilities of the guest. It consists of a triple
+consisting of <phys>, <size> and <maxcpus>.
+
+ <phys>, encoded in BE format represents the maximum address in bytes and
+ hence the maximum memory that can be allocated to the guest.
+
+ <size>, encoded in BE format represents the size increments in which
+ memory can be hot-plugged to the guest.
+
+ <maxcpus>, a BE-encoded integer, represents the maximum number of
+ processors that the guest can have.
+
+pseries guests use this property to note the maximum allowed CPUs for the
+guest.
+
[1] http://thread.gmane.org/gmane.linux.ports.ppc.embedded/75350/focus=106867