From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from terminus.zytor.com ([2001:1868:205::10] helo=mail.zytor.com) by casper.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1To4gM-0007mP-IG for kexec@lists.infradead.org; Thu, 27 Dec 2012 04:02:59 +0000 Message-ID: <50DBC856.6030208@zytor.com> Date: Wed, 26 Dec 2012 20:02:30 -0800 From: "H. Peter Anvin" MIME-Version: 1.0 Subject: Re: [PATCH v3 00/11] xen: Initial kexec/kdump implementation References: <1356574740-6806-1-git-send-email-daniel.kiper@oracle.com> In-Reply-To: <1356574740-6806-1-git-send-email-daniel.kiper@oracle.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: kexec-bounces@lists.infradead.org Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: Daniel Kiper Cc: xen-devel@lists.xensource.com, konrad.wilk@oracle.com, andrew.cooper3@citrix.com, x86@kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, mingo@redhat.com, ebiederm@xmission.com, jbeulich@suse.com, maxim.uvarov@oracle.com, tglx@linutronix.de, vgoyal@redhat.com On 12/26/2012 06:18 PM, Daniel Kiper wrote: > Hi, > > This set of patches contains initial kexec/kdump implementation for Xen v3. > Currently only dom0 is supported, however, almost all infrustructure > required for domU support is ready. > > Jan Beulich suggested to merge Xen x86 assembler code with baremetal x86 code. > This could simplify and reduce a bit size of kernel code. However, this solution > requires some changes in baremetal x86 code. First of all code which establishes > transition page table should be moved back from machine_kexec_$(BITS).c to > relocate_kernel_$(BITS).S. Another important thing which should be changed in that > case is format of page_list array. Xen kexec hypercall requires to alternate physical > addresses with virtual ones. These and other required stuff have not been done in that > version because I am not sure that solution will be accepted by kexec/kdump maintainers. > I hope that this email spark discussion about that topic. > I want a detailed list of the constraints that this assumes and therefore imposes on the native implementation as a result of this. We have had way too many patches where Xen PV hacks effectively nailgun arbitrary, and sometimes poor, design decisions in place and now we can't fix them. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf. _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec