linux-kernel - Re: [PATCH 03/11] xen: Introduce architecture independent data for kexec/kdump

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Message-ID: <20121001133409.GG2942@host-192-168-1-59.local.net-space.pl>
Date:	Mon, 1 Oct 2012 15:34:09 +0200
From:	Daniel Kiper <daniel.kiper@...cle.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	andrew.cooper3@...rix.com, jbeulich@...e.com,
	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com
Subject: Re: [PATCH 03/11] xen: Introduce architecture independent data for
 kexec/kdump

On Fri, Sep 28, 2012 at 12:10:17PM -0400, Konrad Rzeszutek Wilk wrote:
> On Thu, Sep 27, 2012 at 08:06:30PM +0200, Daniel Kiper wrote:
> > Introduce architecture independent constants and structures
>
> Don't you mean 'dependent constants'?

Right.

> > required by Xen kexec/kdump implementation.
> >
> > Signed-off-by: Daniel Kiper <daniel.kiper@...cle.com>
> > ---
> >  include/xen/interface/xen.h |   33 +++++++++++++++++++++++++++++++++
> >  1 files changed, 33 insertions(+), 0 deletions(-)
> >
> > diff --git a/include/xen/interface/xen.h b/include/xen/interface/xen.h
> > index 0801468..ac19f9e 100644
> > --- a/include/xen/interface/xen.h
> > +++ b/include/xen/interface/xen.h
> > @@ -58,6 +58,7 @@
> >  #define __HYPERVISOR_event_channel_op     32
> >  #define __HYPERVISOR_physdev_op           33
> >  #define __HYPERVISOR_hvm_op               34
> > +#define __HYPERVISOR_kexec_op             37
> >  #define __HYPERVISOR_tmem_op              38
> >
> >  /* Architecture-specific hypercall definitions. */
> > @@ -232,7 +233,39 @@ DEFINE_GUEST_HANDLE_STRUCT(mmuext_op);
> >  #define VMASST_TYPE_pae_extended_cr3     3
> >  #define MAX_VMASST_TYPE 3
> >
> > +/*
> > + * Commands to HYPERVISOR_kexec_op().
> > + */
> > +#define KEXEC_CMD_kexec			0
> > +#define KEXEC_CMD_kexec_load		1
> > +#define KEXEC_CMD_kexec_unload		2
> > +#define KEXEC_CMD_kexec_get_range	3
> > +
> > +/*
> > + * Memory ranges for kdump (utilized by HYPERVISOR_kexec_op()).
> > + */
> > +#define KEXEC_RANGE_MA_CRASH		0
> > +#define KEXEC_RANGE_MA_XEN		1
> > +#define KEXEC_RANGE_MA_CPU		2
> > +#define KEXEC_RANGE_MA_XENHEAP		3
> > +#define KEXEC_RANGE_MA_BOOT_PARAM	4
> > +#define KEXEC_RANGE_MA_EFI_MEMMAP	5
> > +#define KEXEC_RANGE_MA_VMCOREINFO	6
> > +
> >  #ifndef __ASSEMBLY__
> > +struct xen_kexec_exec {
> > +	int type;
> > +};
> > +
> > +struct xen_kexec_range {
> > +	int range;
> > +	int nr;
> > +	unsigned long size;
> > +	unsigned long start;
> > +};
>
> Might want to include an little blurb saying what we expect
> in case of running a 32-bit domain on a 64-bit hypervisor
> where the start might be past 4GB?

This is not true. All needed pages used by i386 relocate kernel
code are always below 4 GiB.

Daniel
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