4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Christoffer Dall christoffer.dall@arm.com
[ Upstream commit 1d47191de7e15900f8fbfe7cccd7c6e1c2d7c31a ]
The vgic_init function can race with kvm_arch_vcpu_create() which does not hold kvm_lock() and we therefore have no synchronization primitives to ensure we're doing the right thing.
As the user is trying to initialize or run the VM while at the same time creating more VCPUs, we just have to refuse to initialize the VGIC in this case rather than silently failing with a broken VCPU.
Reviewed-by: Eric Auger eric.auger@redhat.com Signed-off-by: Christoffer Dall christoffer.dall@arm.com Signed-off-by: Marc Zyngier marc.zyngier@arm.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- virt/kvm/arm/vgic/vgic-init.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/virt/kvm/arm/vgic/vgic-init.c +++ b/virt/kvm/arm/vgic/vgic-init.c @@ -241,6 +241,10 @@ int vgic_init(struct kvm *kvm) if (vgic_initialized(kvm)) return 0;
+ /* Are we also in the middle of creating a VCPU? */ + if (kvm->created_vcpus != atomic_read(&kvm->online_vcpus)) + return -EBUSY; + /* freeze the number of spis */ if (!dist->nr_spis) dist->nr_spis = VGIC_NR_IRQS_LEGACY - VGIC_NR_PRIVATE_IRQS;