linux-kernel - [PATCH 1/1] x86/platform/hyperv: When on Hyper-v use NULL legacy PIC

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Date:	Thu,  3 Apr 2014 18:16:33 -0700
From:	"K. Y. Srinivasan" <kys@...rosoft.com>
To:	x86@...nel.org, linux-kernel@...r.kernel.org, olaf@...fle.de,
	apw@...onical.com, jasowang@...hat.com, hpa@...or.com
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>, <stable@...r.kernel.org>,
	"[3.13+]"@linuxonhyperv.com
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 <kys@...rosoft.com>
Cc: <stable@...r.kernel.org>        [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

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