From: Simon Horman <horms@verge.net.au>
To: Daniel Kiper <daniel.kiper@oracle.com>
Cc: keir@xen.org, konrad.wilk@oracle.com, andrew.cooper3@citrix.com,
kexec@lists.infradead.org, david.vrabel@citrix.com,
jbeulich@suse.com, xen-devel@lists.xenproject.org
Subject: Re: [RFC PATCH] crashdump/x86: Add option to get crash kernel region size
Date: Mon, 30 Nov 2015 08:55:32 +0900 [thread overview]
Message-ID: <20151129235532.GB13342@verge.net.au> (raw)
In-Reply-To: <1448741644-905-1-git-send-email-daniel.kiper@oracle.com>
On Sat, Nov 28, 2015 at 09:14:04PM +0100, Daniel Kiper wrote:
> Crash kernel region size is available via sysfs on Linux running on
> bare metal. However, this does not work when Linux runs as Xen dom0.
> In this case Xen crash kernel region size should be established using
> __HYPERVISOR_kexec_op hypercall (Linux kernel kexec functionality does
> not make a lot of sense in Xen dom0). Sadly hypercalls are not easily
> accessible using shell scripts or something like that. Potentially we
> can check "xl dmesg" output for crashkernel option but this is not nice.
> So, let's add this functionality, for Linux running on bare metal and
> as Xen dom0, to kexec-tools. This way kdump scripts may establish crash
> kernel region size in one way regardless of platform. All burden of
> platform detection lies on kexec-tools.
>
> Figure (and unit) displayed by this new kexec-tools functionality is
> the same as one taken from /sys/kernel/kexec_crash_size.
>
> This functionality is available on x86 platform only. If idea is acceptable
> then I can prepare patches for other platforms (if it is possible and make
> sense) and repost them as fully flagged patch series.
>
> Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Thanks, applied.
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next prev parent reply other threads:[~2015-11-29 23:55 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-28 20:14 [RFC PATCH] crashdump/x86: Add option to get crash kernel region size Daniel Kiper
2015-11-29 23:55 ` Simon Horman [this message]
2015-11-30 7:39 ` Daniel Kiper
2015-12-01 6:20 ` Simon Horman
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