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From: Vivek Goyal <vgoyal@redhat.com>
To: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Cc: oomichi@mxs.nes.nec.co.jp, linux-s390@vger.kernel.org,
	mahesh@linux.vnet.ibm.com, heiko.carstens@de.ibm.com,
	linux-kernel@vger.kernel.org, hbabu@us.ibm.com,
	horms@verge.net.au, ebiederm@xmission.com,
	schwidefsky@de.ibm.com, kexec@lists.infradead.org
Subject: Re: [patch v2 03/10] kdump: Add size to elfcorehdr kernel parameter
Date: Tue, 2 Aug 2011 14:55:01 -0400	[thread overview]
Message-ID: <20110802185501.GG6399@redhat.com> (raw)
In-Reply-To: <1312276087.4881.24.camel@br98xy6r>

On Tue, Aug 02, 2011 at 11:08:07AM +0200, Michael Holzheu wrote:
> Hello Vivek,
> 
> #On Mon, 2011-08-01 at 16:36 -0400, Vivek Goyal wrote: 
> > On Wed, Jul 27, 2011 at 02:55:07PM +0200, Michael Holzheu wrote:
> > > From: Michael Holzheu <holzheu@linux.vnet.ibm.com>
> > > 
> > > Currently only the address of the pre-allocated ELF header is passed with
> > > the elfcorehdr= kernel parameter. In order to reserve memory for the header
> > > in the 2nd kernel also the size is required. To pass the size with this
> > > patch the syntax of the kernel parameter is extended as follows:
> > > 
> > > elfcorehdr=[size[KMG]@]offset[KMG]
> > > 
> > > This change is backward compatible because elfcorehdr=size is still allowed.
> > 
> > Generally vmcore parses elfcorehdr to figure out the sizes. kexec-tools
> > knows about it and relevant memory is excluded from second kernel's map
> > with the help of memmap= command line option.
> > 
> > Can you please mention that this is only s390 specific requirement as
> > there are no memmap= equivalent options and somehow dump tools wants
> > to know how big the elf header size is?
> 
> I updated the description: 
> 
> Currently only the address of the pre-allocated ELF header is passed with
> the elfcorehdr= kernel parameter. In order to reserve memory for the header
> in the 2nd kernel also the size is required. Current kdump architecture
> backends use different methods to do that, e.g. x86 uses the memmap= kernel
> parameter. On s390 there is no easy way to transfer this information.
> Therefore the elfcorehdr kernel parameter is extended to also pass the size.
> This now can also be used as standard mechanism by all future kdump
> architecture backends.
> 
> The syntax of the kernel parameter is extended as follows:
> 
> elfcorehdr=[size[KMG]@]offset[KMG]
> 
> This change is backward compatible because elfcorehdr=size is still allowed.
> 
> Ok?

Yes, this one looks ok.

Thanks
Vivek

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WARNING: multiple messages have this Message-ID (diff)
From: Vivek Goyal <vgoyal@redhat.com>
To: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Cc: ebiederm@xmission.com, mahesh@linux.vnet.ibm.com,
	hbabu@us.ibm.com, oomichi@mxs.nes.nec.co.jp, horms@verge.net.au,
	schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com,
	kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
	linux-s390@vger.kernel.org
Subject: Re: [patch v2 03/10] kdump: Add size to elfcorehdr kernel parameter
Date: Tue, 2 Aug 2011 14:55:01 -0400	[thread overview]
Message-ID: <20110802185501.GG6399@redhat.com> (raw)
In-Reply-To: <1312276087.4881.24.camel@br98xy6r>

On Tue, Aug 02, 2011 at 11:08:07AM +0200, Michael Holzheu wrote:
> Hello Vivek,
> 
> #On Mon, 2011-08-01 at 16:36 -0400, Vivek Goyal wrote: 
> > On Wed, Jul 27, 2011 at 02:55:07PM +0200, Michael Holzheu wrote:
> > > From: Michael Holzheu <holzheu@linux.vnet.ibm.com>
> > > 
> > > Currently only the address of the pre-allocated ELF header is passed with
> > > the elfcorehdr= kernel parameter. In order to reserve memory for the header
> > > in the 2nd kernel also the size is required. To pass the size with this
> > > patch the syntax of the kernel parameter is extended as follows:
> > > 
> > > elfcorehdr=[size[KMG]@]offset[KMG]
> > > 
> > > This change is backward compatible because elfcorehdr=size is still allowed.
> > 
> > Generally vmcore parses elfcorehdr to figure out the sizes. kexec-tools
> > knows about it and relevant memory is excluded from second kernel's map
> > with the help of memmap= command line option.
> > 
> > Can you please mention that this is only s390 specific requirement as
> > there are no memmap= equivalent options and somehow dump tools wants
> > to know how big the elf header size is?
> 
> I updated the description: 
> 
> Currently only the address of the pre-allocated ELF header is passed with
> the elfcorehdr= kernel parameter. In order to reserve memory for the header
> in the 2nd kernel also the size is required. Current kdump architecture
> backends use different methods to do that, e.g. x86 uses the memmap= kernel
> parameter. On s390 there is no easy way to transfer this information.
> Therefore the elfcorehdr kernel parameter is extended to also pass the size.
> This now can also be used as standard mechanism by all future kdump
> architecture backends.
> 
> The syntax of the kernel parameter is extended as follows:
> 
> elfcorehdr=[size[KMG]@]offset[KMG]
> 
> This change is backward compatible because elfcorehdr=size is still allowed.
> 
> Ok?

Yes, this one looks ok.

Thanks
Vivek

  reply	other threads:[~2011-08-02 18:55 UTC|newest]

Thread overview: 66+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-07-27 12:55 [patch v2 00/10] kdump: Patch series for s390 support (version 2) Michael Holzheu
2011-07-27 12:55 ` Michael Holzheu
2011-07-27 12:55 ` [patch v2 01/10] kdump: Add KEXEC_CRASH_CONTROL_MEMORY_LIMIT Michael Holzheu
2011-07-27 12:55   ` Michael Holzheu
2011-08-01 20:16   ` Vivek Goyal
2011-08-01 20:16     ` Vivek Goyal
2011-08-02  9:51     ` Michael Holzheu
2011-08-02  9:51       ` Michael Holzheu
2011-08-02 19:16       ` Vivek Goyal
2011-08-02 19:16         ` Vivek Goyal
2011-08-03  9:27         ` Michael Holzheu
2011-08-03  9:27           ` Michael Holzheu
2011-07-27 12:55 ` [patch v2 02/10] kdump: Make kimage_load_crash_segment() weak Michael Holzheu
2011-07-27 12:55   ` Michael Holzheu
2011-08-01 20:31   ` Vivek Goyal
2011-08-01 20:31     ` Vivek Goyal
2011-08-02  9:30     ` Michael Holzheu
2011-08-02  9:30       ` Michael Holzheu
2011-08-02 18:55       ` Vivek Goyal
2011-08-02 18:55         ` Vivek Goyal
2011-08-03 10:41         ` Michael Holzheu
2011-08-03 10:41           ` Michael Holzheu
2011-08-04 20:25           ` Vivek Goyal
2011-08-04 20:25             ` Vivek Goyal
2011-07-27 12:55 ` [patch v2 03/10] kdump: Add size to elfcorehdr kernel parameter Michael Holzheu
2011-07-27 12:55   ` Michael Holzheu
2011-08-01 20:36   ` Vivek Goyal
2011-08-01 20:36     ` Vivek Goyal
2011-08-02  9:08     ` Michael Holzheu
2011-08-02  9:08       ` Michael Holzheu
2011-08-02 18:55       ` Vivek Goyal [this message]
2011-08-02 18:55         ` Vivek Goyal
2011-08-03 10:40         ` Michael Holzheu
2011-08-03 10:40           ` Michael Holzheu
2011-07-27 12:55 ` [patch v2 04/10] kdump: Trigger kdump via panic notifier chain on s390 Michael Holzheu
2011-07-27 12:55   ` Michael Holzheu
2011-08-01 20:41   ` Vivek Goyal
2011-08-01 20:41     ` Vivek Goyal
2011-08-02  8:37     ` Michael Holzheu
2011-08-02  8:37       ` Michael Holzheu
2011-08-02 19:21       ` Vivek Goyal
2011-08-02 19:21         ` Vivek Goyal
2011-08-03  9:50         ` Michael Holzheu
2011-08-03  9:50           ` Michael Holzheu
2011-08-04 21:14           ` Vivek Goyal
2011-08-04 21:14             ` Vivek Goyal
2011-08-08 17:47             ` Michael Holzheu
2011-08-08 17:47               ` Michael Holzheu
2011-08-09 21:19               ` Vivek Goyal
2011-08-09 21:19                 ` Vivek Goyal
2011-07-27 12:55 ` [patch v2 05/10] s390: Add PSW restart shutdown trigger Michael Holzheu
2011-07-27 12:55   ` Michael Holzheu
2011-08-01 20:54   ` Vivek Goyal
2011-08-01 20:54     ` Vivek Goyal
2011-08-02  8:05     ` Michael Holzheu
2011-08-02  8:05       ` Michael Holzheu
2011-07-27 12:55 ` [patch v2 06/10] s390: Export store_status() function Michael Holzheu
2011-07-27 12:55   ` Michael Holzheu
2011-07-27 12:55 ` [patch v2 07/10] s390: Use diagnose 308 for system reset Michael Holzheu
2011-07-27 12:55   ` Michael Holzheu
2011-07-27 12:55 ` [patch v2 08/10] s390: Add real memory access functions Michael Holzheu
2011-07-27 12:55   ` Michael Holzheu
2011-07-27 12:55 ` [patch v2 09/10] s390: kdump backend code Michael Holzheu
2011-07-27 12:55   ` Michael Holzheu
2011-07-27 12:55 ` [patch v2 10/10] kexec-tools: Add s390 kdump support Michael Holzheu
2011-07-27 12:55   ` Michael Holzheu

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