linux-kernel - [PATCH RFC 4/7] KVM: vgic: Add hyp uninitialize function

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Message-Id: <1571912870-18471-5-git-send-email-shannon.zhao@linux.alibaba.com>
Date:   Thu, 24 Oct 2019 18:27:47 +0800
From:   Shannon Zhao <shannon.zhao@...ux.alibaba.com>
To:     kvmarm@...ts.cs.columbia.edu, maz@...nel.org, james.morse@....com,
        suzuki.poulose@....com, christoffer.dall@....com
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH RFC 4/7] KVM: vgic: Add hyp uninitialize function

When KVM ARM exits, it needs to cleanup vgic setup by kvm_vgic_hyp_init.

Signed-off-by: Shannon Zhao <shannon.zhao@...ux.alibaba.com>
---
 include/kvm/arm_vgic.h        | 1 +
 virt/kvm/arm/arm.c            | 1 +
 virt/kvm/arm/vgic/vgic-init.c | 7 +++++++
 3 files changed, 9 insertions(+)

diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index af4f09c..7f44ebb 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -339,6 +339,7 @@ struct vgic_cpu {
 void kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu);
 int kvm_vgic_map_resources(struct kvm *kvm);
 int kvm_vgic_hyp_init(void);
+void kvm_vgic_hyp_uninit(void);
 void kvm_vgic_init_cpu_hardware(void);
 
 int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid,
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index da32c9b..0c60074 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -1724,6 +1724,7 @@ int kvm_arch_init(void *opaque)
 void kvm_arch_exit(void)
 {
 	kvm_perf_teardown();
+	kvm_vgic_hyp_uninit();
 	hyp_cpu_pm_exit();
 }
 
diff --git a/virt/kvm/arm/vgic/vgic-init.c b/virt/kvm/arm/vgic/vgic-init.c
index 6f50c42..cd48047 100644
--- a/virt/kvm/arm/vgic/vgic-init.c
+++ b/virt/kvm/arm/vgic/vgic-init.c
@@ -550,3 +550,10 @@ int kvm_vgic_hyp_init(void)
 			kvm_get_running_vcpus());
 	return ret;
 }
+
+void kvm_vgic_hyp_uninit(void)
+{
+	cpuhp_remove_state(CPUHP_AP_KVM_ARM_VGIC_INIT_STARTING);
+	free_percpu_irq(kvm_vgic_global_state.maint_irq,
+			kvm_get_running_vcpus());
+}
-- 
1.8.3.1