Commit 3d1ad640 authored by Christoffer Dall's avatar Christoffer Dall

KVM: arm/arm64: Fix GICv4 ITS initialization issues

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: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
parent ed8703a5
......@@ -285,11 +285,9 @@ int vgic_init(struct kvm *kvm)
if (ret)
goto out;
if (vgic_supports_direct_msis(kvm)) {
ret = vgic_v4_init(kvm);
if (ret)
goto out;
}
kvm_for_each_vcpu(i, vcpu, kvm)
kvm_vgic_vcpu_enable(vcpu);
......
......@@ -1673,7 +1673,7 @@ static int vgic_its_create(struct kvm_device *dev, u32 type)
if (vgic_initialized(dev->kvm)) {
int ret = vgic_v4_init(dev->kvm);
if (ret) {
if (ret < 0) {
kfree(its);
return ret;
}
......
......@@ -118,6 +118,9 @@ int vgic_v4_init(struct kvm *kvm)
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;
......
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