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

[Vivek Goyal]

On Thu, Sep 25, 2014 at 12:28:55PM +0800, WANG Chao wrote:
>  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;
>  --- 
Acked-by: Vivek Goyal <vgoyal(a)redhat.com&gt;

Thanks
Vivek

>   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