Hi Drew,
On Mon, Nov 27, 2017 at 07:17:18PM +0100, Andrew Jones wrote:
> Recently commit b2c9a85dd75a ("KVM: arm/arm64: vgic: Move
> kvm_vgic_destroy call around") caught my eye. When I looked closer I
> saw that while it made the code saner, it wasn't changing anything.
> kvm_for_each_vcpu() checks for NULL kvm->vcpus[i], so there wasn't
> a NULL dereference being fixed, and because kvm_vgic_vcpu_destroy()
> was called by kvm_arch_vcpu_free() it was still getting called, just
> not by kvm_vgic_destroy() as intended. But now the call from
> kvm_arch_vcpu_free() is redundant, and while currently harmless, it
> should be removed in case kvm_vgic_vcpu_destroy() were ever to
> want to reference vgic state, as kvm_vgic_destroy() now comes before
> kvm_arch_vcpu_free(). Additionally the other architectures set
> kvm->online_vcpus to zero after freeing them. We might as well do
> that for ARM too.
Could this commit message be rewritten to:
kvm_vgic_vcpu_destroy already gets called from kvm_vgic_destroy for
each vcpu, so we don't have to call it from kvm_arch_vcpu_free.
Additionally the other architectures set kvm->online_vcpus to zero
after freeing them. We might as well do that for ARM too.
?
Thanks,
-Christoffer
>
> Signed-off-by: Andrew Jones <drjones@xxxxxxxxxx>
> ---
> virt/kvm/arm/arm.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
> index a6524ff27de4..c5bc79c4ccf7 100644
> --- a/virt/kvm/arm/arm.c
> +++ b/virt/kvm/arm/arm.c
> @@ -188,6 +188,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
> kvm->vcpus[i] = NULL;
> }
> }
> + atomic_set(&kvm->online_vcpus, 0);
> }
>
> int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
> @@ -296,7 +297,6 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
> {
> kvm_mmu_free_memory_caches(vcpu);
> kvm_timer_vcpu_terminate(vcpu);
> - kvm_vgic_vcpu_destroy(vcpu);
> kvm_pmu_vcpu_destroy(vcpu);
> kvm_vcpu_uninit(vcpu);
> kmem_cache_free(kvm_vcpu_cache, vcpu);
> --
> 2.13.6
>
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