From 6bf61ec506cab8c932f678f88820227e194a28c8 Mon Sep 17 00:00:00 2001 From: K. Y. Srinivasan Date: Thu, 3 Apr 2014 08:13:58 -0700 Subject: [PATCH 1/1] x86/platform/hyperv: When on Hyper-v use NULL legacy PIC 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