From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from aserp1040.oracle.com ([141.146.126.69]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1cap8x-0000Hp-RG for kexec@lists.infradead.org; Mon, 06 Feb 2017 19:40:20 +0000 From: Eric DeVolder Subject: [PATCH v2 00/12] crashdump: Add print_crashkernel_region_size() function Date: Mon, 6 Feb 2017 13:42:12 -0600 Message-Id: <1486410144-28595-1-git-send-email-eric.devolder@oracle.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: horms@verge.net.au, kexec@lists.infradead.org, andrew.cooper3@citrix.com, dyoung@redhat.com Cc: daniel.kiper@oracle.com, konrad.wilk@oracle.com 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 patch just adds print_crashkernel_region_size() function, which prints crash kernel region size, for x86 arch. Next patches will add same named function for other archs supported by kexec-tools. Last patch of this series will export this functionality to the userspace via separate kexec utility option. Signed-off-by: Daniel Kiper Signed-off-by: Eric DeVolder --- v0: Interal version. v1: Posted to kexec-tools mailing list v2: Incorporated feedback: - utilize the is_crashkernel_mem_reserved() function common in all archs - for ppc and ppc64, utilize device-tree values to print size - for unsupported architectures, print appropriate message _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec