From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matt Fleming Subject: Re: [PATCH 5/5] efi: Capsule update support and pstore backend Date: Thu, 17 Oct 2013 13:05:19 +0100 Message-ID: <20131017120519.GF10834@console-pimps.org> References: <1381931460-6999-1-git-send-email-matt@console-pimps.org> <1381931460-6999-6-git-send-email-matt@console-pimps.org> <20131016141939.GA28684@srcf.ucam.org> <3908561D78D1C84285E8C5FCA982C28F31D31122@ORSMSX106.amr.corp.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <3908561D78D1C84285E8C5FCA982C28F31D31122-P5GAC/sN6hlZtRGVdHMbwrfspsVTdybXVpNB7YpNyf8@public.gmane.org> Sender: linux-efi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: "Luck, Tony" Cc: Matthew Garrett , "linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , Andi Kleen , Seiji Aguchi , "x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org" , "Fleming, Matt" List-Id: linux-efi@vger.kernel.org On Wed, 16 Oct, at 02:52:25PM, Luck, Tony wrote: > > Where by "May not function correctly" you mean "May crash the system"? > > I'm a little uneasy having this run by default if enabled, even if it's > > disabled by default in the config. > > There's also an "either/or" choice between using efi-capsule with pstore, and the > traditional kexec/kdump method for getting a memory dump from a crash. We > have to go through a reset to save the capsule - but we don't want a reset for > kexec. Perhaps we can pass the reset parameters through the kexec path to > the new kernel to make it do the right kind of reset ... but the value of the capsule > dump is minimal if kdump managed to dump everything. I admit that using kexec with the EFI capsule + pstore code is not something I'd considered. Though as you say, if you manage to jump to your crash kernel I'm not sure how much use the capsule would be. -- Matt Fleming, Intel Open Source Technology Center