Re: [PATCH 01/26] vfio: Wrap KVM helpers with CONFIG_KVM instead of CONFIG_HAVE_KVM

Alex Williamson
2023-09-28T22:23:21Z

On Fri, 15 Sep 2023 17:30:53 -0700
Sean Christopherson <seanjc@google.com> wrote:

> Wrap the helpers for getting references to KVM instances with a check on
> CONFIG_KVM being enabled, not on CONFIG_HAVE_KVM being defined. PPC does
> NOT select HAVE_KVM, despite obviously supporting KVM, and guarding code
> to get references to KVM based on whether or not the architecture supports
> KVM is nonsensical.
>
> Drop the guard around linux/kvm_host.h entirely, conditionally including a
> generic headers is completely unnecessary.
>
> Signed-off-by: Sean Christopherson <seanjc@google.com>
> ---
> drivers/vfio/vfio.h | 2 +-
> drivers/vfio/vfio_main.c | 4 +---
> 2 files changed, 2 insertions(+), 4 deletions(-)

Reviewed-by: Alex Williamson <alex.williamson@redhat.com>

> diff --git a/drivers/vfio/vfio.h b/drivers/vfio/vfio.h
> index 307e3f29b527..c26d1ad68105 100644
> --- a/drivers/vfio/vfio.h
> +++ b/drivers/vfio/vfio.h
> @@ -434,7 +434,7 @@ static inline void vfio_virqfd_exit(void)
> }
> #endif
>
> -#ifdef CONFIG_HAVE_KVM
> +#if IS_ENABLED(CONFIG_KVM)
> void vfio_device_get_kvm_safe(struct vfio_device *device, struct kvm *kvm);
> void vfio_device_put_kvm(struct vfio_device *device);
> #else
> diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c
> index 40732e8ed4c6..80e39f7a6d8f 100644
> --- a/drivers/vfio/vfio_main.c
> +++ b/drivers/vfio/vfio_main.c
> @@ -16,9 +16,7 @@
> #include <linux/fs.h>
> #include <linux/idr.h>
> #include <linux/iommu.h>
> -#ifdef CONFIG_HAVE_KVM
> #include <linux/kvm_host.h>
> -#endif
> #include <linux/list.h>
> #include <linux/miscdevice.h>
> #include <linux/module.h>
> @@ -383,7 +381,7 @@ void vfio_unregister_group_dev(struct vfio_device *device)
> }
> EXPORT_SYMBOL_GPL(vfio_unregister_group_dev);
>
> -#ifdef CONFIG_HAVE_KVM
> +#if IS_ENABLED(CONFIG_KVM)
> void vfio_device_get_kvm_safe(struct vfio_device *device, struct kvm *kvm)
> {
> void (*pfn)(struct kvm *kvm);