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| author | Christoffer Dall <christoffer.dall@linaro.org> | 2016-09-27 18:53:35 +0200 |
|---|---|---|
| committer | Christoffer Dall <christoffer.dall@linaro.org> | 2016-09-27 18:57:35 +0200 |
| commit | 0099b7701f5296a758d9e6b945ec96f96847cc2f (patch) | |
| tree | b476db568803208d16c52d23ce90022b9863c743 | |
| parent | 6fe407f2d18a4f94216263f91cb7d1f08fa5887c (diff) | |
| download | linux-stable-0099b7701f5296a758d9e6b945ec96f96847cc2f.tar.gz linux-stable-0099b7701f5296a758d9e6b945ec96f96847cc2f.tar.bz2 linux-stable-0099b7701f5296a758d9e6b945ec96f96847cc2f.zip | |
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: 0919e84c0fc1 ("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>
| -rw-r--r-- | virt/kvm/arm/vgic/vgic.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c index 8a529a732941..2893d5ba523a 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); |