linux-kernel - [PATCH v3 5/6] KVM: X86: Add NMI support to PV IPIs

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Date:   Tue,  3 Jul 2018 14:21:30 +0800
From:   Wanpeng Li <kernellwp@...il.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: [PATCH v3 5/6] KVM: X86: Add NMI support to PV IPIs

From: Wanpeng Li <wanpengli@...cent.com>

The NMI delivery mode of ICR is used to deliver an NMI to the processor, 
and the vector information is ignored.

Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Radim Krčmář <rkrcmar@...hat.com>
Cc: Vitaly Kuznetsov <vkuznets@...hat.com>
Signed-off-by: Wanpeng Li <wanpengli@...cent.com>
---
 arch/x86/kernel/kvm.c | 13 +++++++++++--
 arch/x86/kvm/x86.c    | 16 +++++++++++-----
 2 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index 81be75b..b866518 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -459,7 +459,7 @@ static void __init sev_map_percpu_data(void)
 #ifdef CONFIG_X86_64
 static int __send_ipi_mask(const struct cpumask *mask, int vector)
 {
-	unsigned long flags, ipi_bitmap_low = 0, ipi_bitmap_high = 0;
+	unsigned long flags, ipi_bitmap_low = 0, ipi_bitmap_high = 0, icr = 0;
 	int cpu, apic_id, ret = 0;
 
 	if (cpumask_empty(mask))
@@ -479,7 +479,16 @@ static int __send_ipi_mask(const struct cpumask *mask, int vector)
 		}
 	}
 
-	ret = kvm_hypercall3(KVM_HC_SEND_IPI, ipi_bitmap_low, ipi_bitmap_high, vector);
+	switch (vector) {
+	default:
+		icr = APIC_DM_FIXED | vector;
+		break;
+	case NMI_VECTOR:
+		icr = APIC_DM_NMI;
+		break;
+	}
+
+	ret = kvm_hypercall3(KVM_HC_SEND_IPI, ipi_bitmap_low, ipi_bitmap_high, icr);
 
 irq_restore_exit:
 	local_irq_restore(flags);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 46657ef..2e4c4d7 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6693,15 +6693,21 @@ static void kvm_pv_kick_cpu_op(struct kvm *kvm, unsigned long flags, int apicid)
  * Return 0 if successfully added and 1 if discarded.
  */
 static int kvm_pv_send_ipi(struct kvm *kvm, unsigned long ipi_bitmap_low,
-			unsigned long ipi_bitmap_high, int vector)
+			unsigned long ipi_bitmap_high, unsigned long icr)
 {
 	int i;
 	struct kvm_apic_map *map;
 	struct kvm_vcpu *vcpu;
-	struct kvm_lapic_irq irq = {
-		.delivery_mode = APIC_DM_FIXED,
-		.vector = vector,
-	};
+	struct kvm_lapic_irq irq = {0};
+
+	switch (icr & APIC_VECTOR_MASK) {
+	default:
+		irq.vector = icr & APIC_VECTOR_MASK;
+		break;
+	case NMI_VECTOR:
+		break;
+	}
+	irq.delivery_mode = icr & APIC_MODE_MASK;
 
 	rcu_read_lock();
 	map = rcu_dereference(kvm->arch.apic_map);
-- 
2.7.4