From: Bharata B Rao Date: Thu, 12 May 2016 13:34:15 +0000 (+0530) Subject: powerpc/numa: Fix multiple bugs in memory_hotplug_max() X-Git-Tag: v3.2.84~151 X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=commitdiff_plain;h=17cc521e4b98258c40dee16e40d834ae22cc2d8c powerpc/numa: Fix multiple bugs in memory_hotplug_max() commit 45b64ee64970dee9392229302efe1d1567e8d304 upstream. memory_hotplug_max() uses hot_add_drconf_memory_max() to get maxmimum addressable memory by referring to ibm,dyanamic-memory property. There are three problems with the current approach: 1 hot_add_drconf_memory_max() assumes that ibm,dynamic-memory includes all the LMBs of the guest, but that is not true for PowerKVM which populates only DR LMBs (LMBs that can be hotplugged/removed) in that property. 2 hot_add_drconf_memory_max() multiplies lmb-size with lmb-count to arrive at the max possible address. Since ibm,dynamic-memory doesn't include RMA LMBs, the address thus obtained will be less than the actual max address. For example, if max possible memory size is 32G, with lmb-size of 256MB there can be 127 LMBs in ibm,dynamic-memory (1 LMB for RMA which won't be present here). hot_add_drconf_memory_max() would then return the max addressable memory as 127 * 256MB = 31.75GB, the max address should have been 32G which is what ibm,lrdr-capacity shows. 3 In PowerKVM, there can be a gap between the end of boot time RAM and beginning of hotplug RAM area. So just multiplying lmb-count with lmb-size will not provide the correct max possible address for PowerKVM. This patch fixes 1 by using ibm,lrdr-capacity property to return the max addressable memory whenever the property is present. Then it fixes 2 & 3 by fetching the address of the last LMB in ibm,dynamic-memory property. Fixes: cd34206e949b ("powerpc: Add memory_hotplug_max()") Signed-off-by: Bharata B Rao Reviewed-by: David Gibson Signed-off-by: Michael Ellerman [bwh: Backported to 3.2: adjust context] Signed-off-by: Ben Hutchings --- Reading git-diff-tree failed