[PULL 50/50] KVM: arm/arm64: vgic: Don't flush/sync without a working vgic
From: Christoffer Dall <hidden>
Date: 2016-09-27 18:06:38
Also in:
kvm, kvmarm, stable
Subsystem:
kernel virtual machine (kvm), the rest · Maintainers:
Paolo Bonzini, Linus Torvalds
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: 0919e84c0fc1 ("KVM: arm/arm64: vgic-new: Add IRQ sync/flush framework")
Cc: stable at vger.kernel.org
Reported-by: Alexander Graf <redacted>
Acked-by: Marc Zyngier <redacted>
Signed-off-by: Christoffer Dall <redacted>
---
Note that this is rework of a patch submitted by Alexander Graf, but
slightly reworked to use vgic_initialized instead of vgic_enabled, as
discussed on the list.
virt/kvm/arm/vgic/vgic.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c
index 8a529a7..2893d5b 100644
--- a/virt/kvm/arm/vgic/vgic.c
+++ b/virt/kvm/arm/vgic/vgic.c@@ -645,6 +645,9 @@ next: /* Sync back the hardware VGIC state into our emulation after a guest's run. */ void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu) { + if (unlikely(!vgic_initialized(vcpu->kvm))) + return; + vgic_process_maintenance_interrupt(vcpu); vgic_fold_lr_state(vcpu); vgic_prune_ap_list(vcpu);
@@ -653,6 +656,9 @@ void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu) /* Flush our emulation state into the GIC hardware before entering the guest. */ void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu) { + if (unlikely(!vgic_initialized(vcpu->kvm))) + return; + spin_lock(&vcpu->arch.vgic_cpu.ap_list_lock); vgic_flush_lr_state(vcpu); spin_unlock(&vcpu->arch.vgic_cpu.ap_list_lock);
--
2.9.0