[PATCH 2/3] kdumpctl: Use kexec file based mode to unload kdump kernel

[Vivek Goyal]

On Fri, Sep 05, 2014 at 08:51:58PM +0800, Baoquan He wrote:
> On 09/05/14 at 07:53am, Vivek Goyal wrote:
> > On Fri, Sep 05, 2014 at 10:57:31AM +0800, Baoquan He wrote:
> > > On 09/05/14 at 10:45am, Dave Young wrote:
> > > > On 09/05/14 at 10:16am, Dave Young wrote:
> > > > > On 09/03/14 at 12:07pm, Vivek Goyal wrote:
> > > > > > Currently old kexec syscall denies unloading a kernel if secureboot is enabled.
> > > > > > I think this is not right behavior and should be changed. But for now, use
> > > > > > new syscall if secureboot is enabled and that allows unloading kernel.
> > > > > 
> > > > > We need to make sure the new syscall is in latest Fedora kernel, then we can add
> > > > > this patch in kexec-tools.
> > > > 
> > > > BTW, seems there's a new kconfig option for the syscall, it need a fedora kernel
> > > > patch if it's not default on.
> > > 
> > > Yeah, I was a little surprised when the OS said kexec_file_load is not
> > > implemented yet. Is there any concern about defaulting CONFIG_KEXEC_FILE
> > > now?
> > 
> > I think it is perfectly fine. This kexec-tools should be able to run
> > on kernels which have CONFIG_KEXEC_FILE=n and user space should display
> > correct error message.
> 
> Yes, understood it after discussion with Dave. Just a little confusing
> when found kexec_file_load suddenly didn't work. I even used gdb to
> check it. That will be better if user space can tell the reason more
> clearly.
> 
> Btw, this will be opened in rhel and fedora, right?

Yes. Latest fedora kernels have already enabled it. I will post RHEL
patches pretty soon.

Thanks
Vivek