linux-kernel - Re: [RFC v2 3/6] crash hp: definitions and prototype changes

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Date:   Wed, 19 Jan 2022 16:25:44 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Eric DeVolder <eric.devolder@...cle.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        kexec@...ts.infradead.org, ebiederm@...ssion.com,
        dyoung@...hat.com, vgoyal@...hat.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        hpa@...or.com, nramas@...ux.microsoft.com, thomas.lendacky@....com,
        robh@...nel.org, efault@....de, rppt@...nel.org,
        konrad.wilk@...cle.com, boris.ostrovsky@...cle.com
Subject: Re: [RFC v2 3/6] crash hp: definitions and prototype changes

On 01/19/22 at 04:23pm, Baoquan He wrote:
> On 12/07/21 at 02:52pm, Eric DeVolder wrote:
> > This change adds members to struct kimage to facilitate crash
> > hotplug support.
> > 
> > This change also defines crash hotplug events and associated
> > prototypes.
> > 
> > Signed-off-by: Eric DeVolder <eric.devolder@...cle.com>
> > ---
> >  include/linux/kexec.h | 21 +++++++++++++++++++--
> >  1 file changed, 19 insertions(+), 2 deletions(-)
> > 
> > diff --git a/include/linux/kexec.h b/include/linux/kexec.h
> > index 0c994ae37729..068f853f1c65 100644
> > --- a/include/linux/kexec.h
> > +++ b/include/linux/kexec.h
> > @@ -221,8 +221,9 @@ struct crash_mem {
> >  extern int crash_exclude_mem_range(struct crash_mem *mem,
> >  				   unsigned long long mstart,
> >  				   unsigned long long mend);
> > -extern int crash_prepare_elf64_headers(struct crash_mem *mem, int kernel_map,
> > -				       void **addr, unsigned long *sz);
> > +extern int crash_prepare_elf64_headers(struct kimage *image,
> > +					struct crash_mem *mem, int kernel_map,
> > +					void **addr, unsigned long *sz);
> >  #endif /* CONFIG_KEXEC_FILE */
> >  
> >  #ifdef CONFIG_KEXEC_ELF
> > @@ -299,6 +300,13 @@ struct kimage {
> >  
> >  	/* Information for loading purgatory */
> >  	struct purgatory_info purgatory_info;
> > +
> > +#ifdef CONFIG_CRASH_HOTPLUG
> > +	bool hotplug_event;
> > +	int offlinecpu;
> > +	bool elf_index_valid;
> > +	int elf_index;
> 
> Do we really need elf_index_valid? Can we initialize elf_index to , e.g '-1',
> then check if the value is valid?

Sorry, please ignore this one, I will add this comment in v3 thread.

> 
> > +#endif
> >  #endif
> >  
> >  #ifdef CONFIG_IMA_KEXEC
> > @@ -315,6 +323,15 @@ struct kimage {
> >  	unsigned long elf_load_addr;
> >  };
> >  
> > +#ifdef CONFIG_CRASH_HOTPLUG
> > +void arch_crash_hotplug_handler(struct kimage *image,
> > +	unsigned int hp_action, unsigned long a, unsigned long b);
> > +#define KEXEC_CRASH_HP_REMOVE_CPU   0
> > +#define KEXEC_CRASH_HP_ADD_CPU      1
> > +#define KEXEC_CRASH_HP_REMOVE_MEMORY 2
> > +#define KEXEC_CRASH_HP_ADD_MEMORY   3
> > +#endif /* CONFIG_CRASH_HOTPLUG */
> > +
> >  /* kexec interface functions */
> >  extern void machine_kexec(struct kimage *image);
> >  extern int machine_kexec_prepare(struct kimage *image);
> > -- 
> > 2.27.0
> > 
>