Re: [PATCH kvmtool 01/21] ioport: Remove ioport__setup_arch()

Alexandru Elisei
2021-02-10T17:46:05Z

Hi Andre,

On 12/10/20 2:28 PM, Andre Przywara wrote:
> Since x86 had a special need for registering tons of special I/O ports,
> we had an ioport__setup_arch() callback, to allow each architecture
> to do the same. As it turns out no one uses it beside x86, so we remove
> that unnecessary abstraction.
>
> The generic function was registered via a device_base_init() call, so
> we just do the same for the x86 specific function only, and can remove
> the unneeded ioport__setup_arch().
>
> Signed-off-by: Andre Przywara <andre.przywara@arm.com>
> ---
> arm/ioport.c | 5 -----
> include/kvm/ioport.h | 1 -
> ioport.c | 28 ----------------------------
> mips/kvm.c | 5 -----
> powerpc/ioport.c | 6 ------
> x86/ioport.c | 25 ++++++++++++++++++++++++-
> 6 files changed, 24 insertions(+), 46 deletions(-)
>
> diff --git a/arm/ioport.c b/arm/ioport.c
> index 2f0feb9a..24092c9d 100644
> --- a/arm/ioport.c
> +++ b/arm/ioport.c
> @@ -1,11 +1,6 @@
> #include "kvm/ioport.h"
> #include "kvm/irq.h"
>
> -int ioport__setup_arch(struct kvm *kvm)
> -{
> - return 0;
> -}
> -
> void ioport__map_irq(u8 *irq)
> {
> *irq = irq__alloc_line();
> diff --git a/include/kvm/ioport.h b/include/kvm/ioport.h
> index 039633f7..d0213541 100644
> --- a/include/kvm/ioport.h
> +++ b/include/kvm/ioport.h
> @@ -35,7 +35,6 @@ struct ioport_operations {
> enum irq_type));
> };
>
> -int ioport__setup_arch(struct kvm *kvm);
> void ioport__map_irq(u8 *irq);
>
> int __must_check ioport__register(struct kvm *kvm, u16 port, struct ioport_operations *ops,
> diff --git a/ioport.c b/ioport.c
> index 844a832d..667e8386 100644
> --- a/ioport.c
> +++ b/ioport.c
> @@ -158,21 +158,6 @@ int ioport__unregister(struct kvm *kvm, u16 port)
> return 0;
> }
>
> -static void ioport__unregister_all(void)
> -{
> - struct ioport *entry;
> - struct rb_node *rb;
> - struct rb_int_node *rb_node;
> -
> - rb = rb_first(&ioport_tree);
> - while (rb) {
> - rb_node = rb_int(rb);
> - entry = ioport_node(rb_node);
> - ioport_unregister(&ioport_tree, entry);
> - rb = rb_first(&ioport_tree);
> - }
> -}

I get the impression this is a rebasing artifact. The commit message doesn't
mention anything about removing ioport__exit() -> ioport__unregister_all(), and as
far as I can tell it's still needed because there are places other than
ioport__setup_arch() from where ioport__register() is called.

Thanks,

Alex

> -
> static const char *to_direction(int direction)
> {
> if (direction == KVM_EXIT_IO_IN)
> @@ -220,16 +205,3 @@ out:
>
> return !kvm->cfg.ioport_debug;
> }
> -
> -int ioport__init(struct kvm *kvm)
> -{
> - return ioport__setup_arch(kvm);
> -}
> -dev_base_init(ioport__init);
> -
> -int ioport__exit(struct kvm *kvm)
> -{
> - ioport__unregister_all();
> - return 0;
> -}
> -dev_base_exit(ioport__exit);
> diff --git a/mips/kvm.c b/mips/kvm.c
> index 26355930..e110e5d5 100644
> --- a/mips/kvm.c
> +++ b/mips/kvm.c
> @@ -100,11 +100,6 @@ void kvm__irq_trigger(struct kvm *kvm, int irq)
> die_perror("KVM_IRQ_LINE ioctl");
> }
>
> -int ioport__setup_arch(struct kvm *kvm)
> -{
> - return 0;
> -}
> -
> bool kvm__arch_cpu_supports_vm(void)
> {
> return true;
> diff --git a/powerpc/ioport.c b/powerpc/ioport.c
> index 0c188b61..a5cff4ee 100644
> --- a/powerpc/ioport.c
> +++ b/powerpc/ioport.c
> @@ -12,12 +12,6 @@
>
> #include <stdlib.h>
>
> -int ioport__setup_arch(struct kvm *kvm)
> -{
> - /* PPC has no legacy ioports to set up */
> - return 0;
> -}
> -
> void ioport__map_irq(u8 *irq)
> {
> }
> diff --git a/x86/ioport.c b/x86/ioport.c
> index 7ad7b8f3..8c5c7699 100644
> --- a/x86/ioport.c
> +++ b/x86/ioport.c
> @@ -69,7 +69,7 @@ void ioport__map_irq(u8 *irq)
> {
> }
>
> -int ioport__setup_arch(struct kvm *kvm)
> +static int ioport__setup_arch(struct kvm *kvm)
> {
> int r;
>
> @@ -150,3 +150,26 @@ int ioport__setup_arch(struct kvm *kvm)
>
> return 0;
> }
> +dev_base_init(ioport__setup_arch);
> +
> +static int ioport__remove_arch(struct kvm *kvm)
> +{
> + ioport__unregister(kvm, 0x510);
> + ioport__unregister(kvm, 0x402);
> + ioport__unregister(kvm, 0x03D5);
> + ioport__unregister(kvm, 0x03D4);
> + ioport__unregister(kvm, 0x0378);
> + ioport__unregister(kvm, 0x0278);
> + ioport__unregister(kvm, 0x00F0);
> + ioport__unregister(kvm, 0x00ED);
> + ioport__unregister(kvm, IOPORT_DBG);
> + ioport__unregister(kvm, 0x00C0);
> + ioport__unregister(kvm, 0x00A0);
> + ioport__unregister(kvm, 0x0092);
> + ioport__unregister(kvm, 0x0040);
> + ioport__unregister(kvm, 0x0020);
> + ioport__unregister(kvm, 0x0000);
> +
> + return 0;
> +}
> +dev_base_exit(ioport__remove_arch);