We should only try to initialize GICv4 data structures on a GICv4
capable system. Move the vgic_supports_direct_msis() check inito
vgic_v4_init() so that any KVM VGIC initialization path does not fail
on non-GICv4 systems.
Also be slightly more strict in the checking of the return value in
vgic_its_create, and only error out on negative return values from the
vgic_v4_init() function. This is important because the kvm device code
only treats negative values as errors and only cleans up in this case.
Errornously treating a positive return value as an error from the
vgic_v4_init() function can lead to NULL pointer dereferences, as has
recently been observed.
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
if (ret)
goto out;
- if (vgic_supports_direct_msis(kvm)) {
- ret = vgic_v4_init(kvm);
- if (ret)
- goto out;
- }
+ ret = vgic_v4_init(kvm);
+ if (ret)
+ goto out;
kvm_for_each_vcpu(i, vcpu, kvm)
kvm_vgic_vcpu_enable(vcpu);
if (vgic_initialized(dev->kvm)) {
int ret = vgic_v4_init(dev->kvm);
- if (ret) {
+ if (ret < 0) {
kfree(its);
return ret;
}
struct kvm_vcpu *vcpu;
int i, nr_vcpus, ret;
+ if (!vgic_supports_direct_msis(kvm))
+ return 0; /* Nothing to see here... move along. */
+
if (dist->its_vm.vpes)
return 0;