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authorChristoffer Dall <christoffer.dall@linaro.org>2014-11-06 11:47:39 +0000
committerPaolo Bonzini <pbonzini@redhat.com>2014-11-26 14:40:44 +0100
commit6b50f54064a02b77a7b990032b80234fee59bcd6 (patch)
tree8fd347d96d760a81c9e866b999a534ac89627a0d /virt
parentdb7dedd0de714a59d8fa2a1be3b6b00543ad415a (diff)
downloadlinux-6b50f54064a02b77a7b990032b80234fee59bcd6.tar.gz
arm/arm64: KVM: vgic: Fix error code in kvm_vgic_create()
If we detect another vCPU is running we just exit and return 0 as if we succesfully created the VGIC, but the VGIC wouldn't actual be created. This shouldn't break in-kernel behavior because the kernel will not observe the failed the attempt to create the VGIC, but userspace could be rightfully confused. Cc: Andre Przywara <andre.przywara@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/arm/vgic.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 3aaca49de32..aacdb59f30d 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1933,7 +1933,7 @@ out:
int kvm_vgic_create(struct kvm *kvm)
{
- int i, vcpu_lock_idx = -1, ret = 0;
+ int i, vcpu_lock_idx = -1, ret;
struct kvm_vcpu *vcpu;
mutex_lock(&kvm->lock);
@@ -1948,6 +1948,7 @@ int kvm_vgic_create(struct kvm *kvm)
* vcpu->mutex. By grabbing the vcpu->mutex of all VCPUs we ensure
* that no other VCPUs are run while we create the vgic.
*/
+ ret = -EBUSY;
kvm_for_each_vcpu(i, vcpu, kvm) {
if (!mutex_trylock(&vcpu->mutex))
goto out_unlock;
@@ -1955,11 +1956,10 @@ int kvm_vgic_create(struct kvm *kvm)
}
kvm_for_each_vcpu(i, vcpu, kvm) {
- if (vcpu->arch.has_run_once) {
- ret = -EBUSY;
+ if (vcpu->arch.has_run_once)
goto out_unlock;
- }
}
+ ret = 0;
spin_lock_init(&kvm->arch.vgic.lock);
kvm->arch.vgic.in_kernel = true;