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KVM: arm/arm64: vgic: Don't flush/sync without a working vgic
If the vgic hasn't been created and initialized, we shouldn't attempt to
look at its data structures or flush/sync anything to the GIC hardware.
This fixes an issue reported by Alexander Graf when using a userspace
irqchip.
Fixes: 0919e84c0f
("KVM: arm/arm64: vgic-new: Add IRQ sync/flush framework")
Cc: stable@vger.kernel.org
Reported-by: Alexander Graf <agraf@suse.de>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
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1 changed files with 6 additions and 0 deletions
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@ -645,6 +645,9 @@ static void vgic_flush_lr_state(struct kvm_vcpu *vcpu)
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/* Sync back the hardware VGIC state into our emulation after a guest's run. */
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void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu)
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{
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if (unlikely(!vgic_initialized(vcpu->kvm)))
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return;
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vgic_process_maintenance_interrupt(vcpu);
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vgic_fold_lr_state(vcpu);
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vgic_prune_ap_list(vcpu);
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@ -653,6 +656,9 @@ void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu)
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/* Flush our emulation state into the GIC hardware before entering the guest. */
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void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu)
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{
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if (unlikely(!vgic_initialized(vcpu->kvm)))
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return;
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spin_lock(&vcpu->arch.vgic_cpu.ap_list_lock);
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vgic_flush_lr_state(vcpu);
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spin_unlock(&vcpu->arch.vgic_cpu.ap_list_lock);
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