From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753933AbaDDAW1 (ORCPT ); Thu, 3 Apr 2014 20:22:27 -0400 Received: from p3plsmtps2ded04.prod.phx3.secureserver.net ([208.109.80.198]:52442 "EHLO p3plsmtps2ded04.prod.phx3.secureserver.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753443AbaDDAWX (ORCPT ); Thu, 3 Apr 2014 20:22:23 -0400 x-originating-ip: 72.167.245.219 From: "K. Y. Srinivasan" To: x86@kernel.org, linux-kernel@vger.kernel.org, olaf@aepfle.de, apw@canonical.com, jasowang@redhat.com, hpa@zytor.com Cc: "K. Y. Srinivasan" , , "[3.13+]"@linuxonhyperv.com Subject: [PATCH 1/1] x86/platform/hyperv: When on Hyper-v use NULL legacy PIC Date: Thu, 3 Apr 2014 18:16:33 -0700 Message-Id: <1396574193-12043-1-git-send-email-kys@microsoft.com> X-Mailer: git-send-email 1.7.4.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Use the NULL legacy PIC when on Hyper-V. With this change we can support kexec even when booting on EFI firmware. This patch has been tested on both EFI as well as non-EFI firmware stacks on Hyper-V. This patch is required to support kexec on EFI firmware on Hyper-V. Please apply. Signed-off-by: K. Y. Srinivasan Cc: [3.13+] --- arch/x86/kernel/cpu/mshyperv.c | 10 ++-------- 1 files changed, 2 insertions(+), 8 deletions(-) diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index 76f98fe..47359f7 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -133,14 +133,8 @@ static void __init ms_hyperv_init_platform(void) printk(KERN_INFO "HyperV: LAPIC Timer Frequency: %#x\n", lapic_timer_frequency); - /* - * On Hyper-V, when we are booting off an EFI firmware stack, - * we do not have many legacy devices including PIC, PIT etc. - */ - if (efi_enabled(EFI_BOOT)) { - printk(KERN_INFO "HyperV: Using null_legacy_pic\n"); - legacy_pic = &null_legacy_pic; - } + printk(KERN_INFO "HyperV: Using null_legacy_pic\n"); + legacy_pic = &null_legacy_pic; } #endif -- 1.7.4.1