On Fri, Dec 01, 2017 at 09:09:19AM +0100, Christoffer Dall wrote:
> 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.
Sure, I don't mind you removing the '-v' (verbose) from it. Should I
respin? Or is that something you don't mind doing while applying?
Thanks,
drew
>
> ?
>
> Thanks,
> -Christoffer
>
>
>
> >
> > Signed-off-by: Andrew Jones <[email protected]>
> > ---
> > 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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