[PATCH] ppc64, ppc64le: disable kvm CMA reservation in kdump kernel

[WANG Chao]

By default on powerpc platform, kvm will reserve a relatively large CMA
(128M aligned) at early boot. In kdump kernel, even KVM sounds useless
but still it reserves 128M and makes kdump kernel fail to boot.

Now fix this by adding the following to kernel command line:

"kvm_cma_resv_ratio=0"

which disable the CMA reservation.

Signed-off-by: WANG Chao <chaowang(a)redhat.com&gt;
---
 kdump.sysconfig.ppc64   | 2 +-
 kdump.sysconfig.ppc64le | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kdump.sysconfig.ppc64 b/kdump.sysconfig.ppc64
index ca7e1d8..923aa26 100644
--- a/kdump.sysconfig.ppc64
+++ b/kdump.sysconfig.ppc64
@@ -16,7 +16,7 @@ KDUMP_COMMANDLINE=""
 
 # This variable lets us append arguments to the current kdump commandline
 # As taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline
-KDUMP_COMMANDLINE_APPEND="irqpoll maxcpus=1 noirqdistrib reset_devices
cgroup_disable=memory numa=off udev.children-max=2 ehea.use_mcs=0 panic=10
rootflags=nofail"
+KDUMP_COMMANDLINE_APPEND="irqpoll maxcpus=1 noirqdistrib reset_devices
cgroup_disable=memory numa=off udev.children-max=2 ehea.use_mcs=0 panic=10
rootflags=nofail kvm_cma_resv_ratio=0"
 
 # Any additional kexec arguments required.  In most situations, this should
 # be left empty
diff --git a/kdump.sysconfig.ppc64le b/kdump.sysconfig.ppc64le
index ca7e1d8..923aa26 100644
--- a/kdump.sysconfig.ppc64le
+++ b/kdump.sysconfig.ppc64le
@@ -16,7 +16,7 @@ KDUMP_COMMANDLINE=""
 
 # This variable lets us append arguments to the current kdump commandline
 # As taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline
-KDUMP_COMMANDLINE_APPEND="irqpoll maxcpus=1 noirqdistrib reset_devices
cgroup_disable=memory numa=off udev.children-max=2 ehea.use_mcs=0 panic=10
rootflags=nofail"
+KDUMP_COMMANDLINE_APPEND="irqpoll maxcpus=1 noirqdistrib reset_devices
cgroup_disable=memory numa=off udev.children-max=2 ehea.use_mcs=0 panic=10
rootflags=nofail kvm_cma_resv_ratio=0"
 
 # Any additional kexec arguments required.  In most situations, this should
 # be left empty
-- 
1.9.3