Re: [PATCH v13 7/7] x86/crash: add x86 crash hotplug support

[Eric DeVolder]

On 11/2/22 11:19, Borislav Petkov wrote:
> On Wed, Nov 02, 2022 at 09:55:06AM -0500, Eric DeVolder wrote:
> > > "But on a plain simple laptop or workstation which has CPU hotplug,
> > > would it make sense for the crash ranges to get updated too when CPUs
> > > are offlined?
> >
> > Yes, it does.
>
> Why?

Technically the answer is no; cpu hotplug events are independent of memory hotplug events, but both 
are written into the elfcorehdr, so in reality yes... The elfcorehdr contains a single list of Phdrs 
describing CPUs and crash memory ranges; the entire list is re-written on a hotplug change.

Eric