Re: [PATCHv2] x86/boot/KASLR: skip the specified crashkernel reserved region

[Pingfan Liu]

On Fri, Mar 22, 2019 at 4:34 PM Baoquan He <bhe@xxxxxxxxxx> wrote:
>
> On 03/22/19 at 03:52pm, Baoquan He wrote:
> > On 03/22/19 at 03:43pm, Pingfan Liu wrote:
> > > > > +/* parse crashkernel=x@y option */
> > > > > +static void mem_avoid_crashkernel_simple(char *option)
> > > >
> > > > Chao ever mentioned this, I want to ask again, why does it has to be
> > > > xxx_simple()?
> > > >
> > > Seems that I had replied Chao's question in another email. The naming
> > > follows the function parse_crashkernel_simple(), as the notes above
> >                        ~~~~~~~~~~~~~~~~~~~~~~~~
> >
> > Sorry, I don't get.  typo?
>
> OK, I misunderstood it. We do have parse_crashkernel_simple() to handle
> crashkernel=size[@offset] case, to differente with other complicated
> cases, like crashkernel=size,[high|low],
>
> Then I am fine with this naming. Soryy about the noise.
>
> By the way, do you think if we should take care of this case:
> crashkernel=<range1>:<size1>[,<range2>:<size2>,...][@offset]
>
> It can also specify @offset. Not sure if it's too complicated, you may
> have a investigation.
>
In this case, kernel should get the total memory size info. So
process_e820_entries() or process_efi_entries() should be called
twice. One before handle_mem_options(), so crashkernel can evaluate
the reserved size. It is doable, and what is your opinion about the
extra complicate?

Thanks,
Pingfan
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