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@xxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [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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