linux-kernel - [PATCH 1/1] x86/hyper-V: Allocate the IDT entry early in boot

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Message-Id: <20170908231557.2419-1-kys@exchange.microsoft.com>
Date:   Fri,  8 Sep 2017 16:15:57 -0700
From:   kys@...hange.microsoft.com
To:     x86@...nel.org, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
        olaf@...fle.de, apw@...onical.com, jasowang@...hat.com,
        tglx@...utronix.de, hpa@...or.com, mingo@...nel.org
Cc:     "K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH 1/1] x86/hyper-V: Allocate the IDT entry early in boot 

From: "K. Y. Srinivasan" <kys@...rosoft.com>

Allocate the hypervisor callback IDT entry early in the boot sequence.

Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
---
 arch/x86/kernel/cpu/mshyperv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index 3b3f713e15e5..236324e83a3a 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -59,8 +59,6 @@ void hyperv_vector_handler(struct pt_regs *regs)
 void hv_setup_vmbus_irq(void (*handler)(void))
 {
 	vmbus_handler = handler;
-	/* Setup the IDT for hypervisor callback */
-	alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, hyperv_callback_vector);
 }
 
 void hv_remove_vmbus_irq(void)
@@ -251,6 +249,8 @@ static void __init ms_hyperv_init_platform(void)
 	 */
 	x86_platform.apic_post_init = hyperv_init;
 	hyperv_setup_mmu_ops();
+	/* Setup the IDT for hypervisor callback */
+	alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, hyperv_callback_vector);
 #endif
 }
 
-- 
2.14.1