On Wed, 2 Nov 2022 23:18:52 +0000
Sean Christopherson <seanjc@xxxxxxxxxx> wrote:
> Move the guts of kvm_arch_init() into a new helper, __kvm_s390_init(),
> and invoke the new helper directly from kvm_s390_init() instead of
> bouncing through kvm_init(). Invoking kvm_arch_init() is the very
> first action performed by kvm_init(), i.e. this is a glorified nop.
>
> Moving setup to __kvm_s390_init() will allow tagging more functions as
> __init, and emptying kvm_arch_init() will allow dropping the hook
> entirely once all architecture implementations are nops.
>
> No functional change intended.
>
> Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
> ---
> arch/s390/kvm/kvm-s390.c | 29 +++++++++++++++++++++++++----
> 1 file changed, 25 insertions(+), 4 deletions(-)
>
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 7fcd2d3b3558..e1c9980aae78 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -461,7 +461,7 @@ static void kvm_s390_cpu_feat_init(void)
> */
> }
>
> -int kvm_arch_init(void *opaque)
> +static int __kvm_s390_init(void)
> {
> int rc = -ENOMEM;
>
> @@ -519,7 +519,7 @@ int kvm_arch_init(void *opaque)
> return rc;
> }
>
> -void kvm_arch_exit(void)
> +static void __kvm_s390_exit(void)
> {
> gmap_unregister_pte_notifier(&gmap_notifier);
> gmap_unregister_pte_notifier(&vsie_gmap_notifier);
> @@ -533,6 +533,16 @@ void kvm_arch_exit(void)
> debug_unregister(kvm_s390_dbf_uv);
> }
>
> +int kvm_arch_init(void *opaque)
> +{
> + return 0;
> +}
> +
> +void kvm_arch_exit(void)
> +{
> +
> +}
> +
I wonder at this point if it's possible to define kvm_arch_init and
kvm_arch_exit directly in kvm_main.c with __weak
> /* Section: device related */
> long kvm_arch_dev_ioctl(struct file *filp,
> unsigned int ioctl, unsigned long arg)
> @@ -5634,7 +5644,7 @@ static inline unsigned long nonhyp_mask(int i)
>
> static int __init kvm_s390_init(void)
> {
> - int i;
> + int i, r;
>
> if (!sclp.has_sief2) {
> pr_info("SIE is not available\n");
> @@ -5650,12 +5660,23 @@ static int __init kvm_s390_init(void)
> kvm_s390_fac_base[i] |=
> stfle_fac_list[i] & nonhyp_mask(i);
>
> - return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
> + r = __kvm_s390_init();
> + if (r)
> + return r;
> +
> + r = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
> + if (r) {
> + __kvm_s390_exit();
> + return r;
> + }
> + return 0;
> }
>
> static void __exit kvm_s390_exit(void)
> {
> kvm_exit();
> +
> + __kvm_s390_exit();
> }
>
> module_init(kvm_s390_init);
