KVM: arm64: Fix GICv4 init when called from vgic_its_create

Commit 3d1ad640f8c94 ("KVM: arm/arm64: Fix GICv4 ITS initialization
issues") moved the vgic_supports_direct_msis() check in vgic_v4_init().
However when vgic_v4_init is called from vgic_its_create(), the has_its
field is not yet set. Hence vgic_supports_direct_msis returns false and
vgic_v4_init does nothing.

The gic/its init sequence is a bit messy, so let's be specific about the
prerequisite checks in the various call paths instead of relying on a
common wrapper.

Fixes: 3d1ad640f8c94 ("KVM: arm/arm64: Fix GICv4 ITS initialization issues")
Reported-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>

diff --git a/virt/kvm/arm/vgic/vgic-init.c b/virt/kvm/arm/vgic/vgic-init.c
index 6231012..743ca5c 100644 (file)
--- a/virt/kvm/arm/vgic/vgic-init.c
+++ b/virt/kvm/arm/vgic/vgic-init.c
@@ -285,9 +285,11 @@ int vgic_init(struct kvm *kvm)
        if (ret)
                goto out;
 
-       ret = vgic_v4_init(kvm);
-       if (ret)
-               goto out;
+       if (vgic_has_its(kvm)) {
+               ret = vgic_v4_init(kvm);
+               if (ret)
+                       goto out;
+       }
 
        kvm_for_each_vcpu(i, vcpu, kvm)
                kvm_vgic_vcpu_enable(vcpu);

diff --git a/virt/kvm/arm/vgic/vgic-v4.c b/virt/kvm/arm/vgic/vgic-v4.c
index 4a37292..bc42651 100644 (file)
--- a/virt/kvm/arm/vgic/vgic-v4.c
+++ b/virt/kvm/arm/vgic/vgic-v4.c
@@ -118,7 +118,7 @@ int vgic_v4_init(struct kvm *kvm)
        struct kvm_vcpu *vcpu;
        int i, nr_vcpus, ret;
 
-       if (!vgic_supports_direct_msis(kvm))
+       if (!kvm_vgic_global_state.has_gicv4)
                return 0; /* Nothing to see here... move along. */
 
        if (dist->its_vm.vpes)