Re: [PATCH 42/45] KVM: arm64: Free sve_state via arm specific hook

Sean Christopherson
2019-10-22T18:41:39Z

On Tue, Oct 22, 2019 at 01:43:42PM +0200, Christoffer Dall wrote:
> On Mon, Oct 21, 2019 at 06:59:22PM -0700, Sean Christopherson wrote:
> > Add an arm specific hook to free the arm64-only sve_state. Doing so
> > eliminates the last functional code from kvm_arch_vcpu_uninit() across
> > all architectures and paves the way for removing kvm_arch_vcpu_init()
> > and kvm_arch_vcpu_uninit() entirely.
> >
> > Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> > ---
> > arch/arm/include/asm/kvm_host.h | 1 +
> > arch/arm64/include/asm/kvm_host.h | 1 +
> > arch/arm64/kvm/reset.c | 5 +++++
> > virt/kvm/arm/arm.c | 2 ++
> > 4 files changed, 9 insertions(+)
> >
> > diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
> > index 8a37c8e89777..cc414de5acd3 100644
> > --- a/arch/arm/include/asm/kvm_host.h
> > +++ b/arch/arm/include/asm/kvm_host.h
> > @@ -333,6 +333,7 @@ static inline void kvm_arch_sync_events(struct kvm *kvm) {}
> > static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
> > static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
> > static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
> > +static inline int kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu) {}
> >
> > static inline void kvm_arm_init_debug(void) {}
> > static inline void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) {}
> > diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> > index f656169db8c3..92d7c384a4ed 100644
> > --- a/arch/arm64/include/asm/kvm_host.h
> > +++ b/arch/arm64/include/asm/kvm_host.h
> > @@ -52,6 +52,7 @@ int kvm_arm_init_sve(void);
> >
> > int __attribute_const__ kvm_target_cpu(void);
> > int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
> > +int kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu);
> > void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
> > int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext);
> > void __extended_idmap_trampoline(phys_addr_t boot_pgd, phys_addr_t idmap_start);
> > diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
> > index f4a8ae918827..98abc4278f42 100644
> > --- a/arch/arm64/kvm/reset.c
> > +++ b/arch/arm64/kvm/reset.c
> > @@ -205,6 +205,11 @@ bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu)
> > }
> >
> > void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
> > +{
> > +
> > +}
> > +
> > +int kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu)
> > {
> > kfree(vcpu->arch.sve_state);
> > }
>
> nit: warning: control reaches end of non-void function

Doh, fixed. Thanks for the quick review!