From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail.skyhub.de ([2a01:4f8:190:11c2::b:1457]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gRLG1-0000hK-Q0 for kexec@lists.infradead.org; Mon, 26 Nov 2018 18:05:19 +0000 Date: Mon, 26 Nov 2018 19:04:55 +0100 From: Borislav Petkov Subject: Re: [PATCH 0/2 RESEND v7] add reserved e820 ranges to the kdump kernel e820 table Message-ID: <20181126180455.GI4843@zn.tnic> References: <20181124051223.19994-1-lijiang@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: Dave Hansen Cc: tony.luck@intel.com, fenghua.yu@intel.com, linux-efi@vger.kernel.org, linux-ia64@vger.kernel.org, Lianbo Jiang , bhe@redhat.com, ard.biesheuvel@linaro.org, peterz@infradead.org, x86@kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, dave.hansen@linux.intel.com, luto@kernel.org, tglx@linutronix.de, dyoung@redhat.com, akpm@linux-foundation.org On Mon, Nov 26, 2018 at 09:44:46AM -0800, Dave Hansen wrote: > On 11/23/18 9:12 PM, Lianbo Jiang wrote: > > These patches add the new I/O resource descriptor 'IORES_DESC_RESERVED' > > for the iomem resources search interfaces, and in order to make it still > > work after the new descriptor is added, these codes originally related > > to 'IORES_DESC_NONE' have been updated. > > I'm having a really hard time figuring out what problem these patches solve. > > What end-user visible behavior does this set change? Yeah, that was a long process of digging out the "why". I'd recommend reading the previous threads and, more specifically: https://lkml.kernel.org/r/CABhMZUUscS3jUZUSM5Y6EYJK6weo7Mjj5-EAKGvbw0qEe%2B38zw@mail.gmail.com in short: we need to export e820 reserved ranges to the second kernel so that it can talk to PCI devices properly. (And I'm wondering how it did work until now...) -- Regards/Gruss, Boris. Good mailing practices for 400: avoid top-posting and trim the reply. _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec