Re: [PATCH kvmtool 19/21] Remove ioport specific routines

[Alexandru Elisei <alexandru.elisei@arm.com>]

Hi Andre,

On 12/10/20 2:29 PM, Andre Przywara wrote:
> Now that all users of the dedicated ioport trap handler interface are
> gone, we can retire the code associated with it.
>
> This removes ioport.c and ioport.h, along with removing prototypes from
> other header files.
>
> This also transfers the responsibility for port I/O trap handling
> entirely into the new routine in mmio.c.
>
> Signed-off-by: Andre Przywara <andre.przywara@arm.com>
> ---
>  Makefile             |   1 -
>  include/kvm/ioport.h |  20 -----
>  include/kvm/kvm.h    |   2 -
>  ioport.c             | 173 -------------------------------------------
>  mmio.c               |   2 +-
>  5 files changed, 1 insertion(+), 197 deletions(-)
>  delete mode 100644 ioport.c
>
> diff --git a/Makefile b/Makefile
> index 35bb1182..94ff5da6 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -56,7 +56,6 @@ OBJS	+= framebuffer.o
>  OBJS	+= guest_compat.o
>  OBJS	+= hw/rtc.o
>  OBJS	+= hw/serial.o
> -OBJS	+= ioport.o
>  OBJS	+= irq.o
>  OBJS	+= kvm-cpu.o
>  OBJS	+= kvm.o
> diff --git a/include/kvm/ioport.h b/include/kvm/ioport.h
> index a61038e2..38636553 100644
> --- a/include/kvm/ioport.h
> +++ b/include/kvm/ioport.h
> @@ -17,28 +17,8 @@
>  
>  struct kvm;

Looks to me like the above forward declaration can be removed; same for all the
includes except linux/byteorder.h, needed for the lexx_to_cpu/cpu_to_lexx
functions, and linux/types.h for the uxx typedefs. Otherwise looks good.

Thanks,

Alex

>  
> -struct ioport {
> -	struct rb_int_node		node;
> -	struct ioport_operations	*ops;
> -	void				*priv;
> -	struct device_header		dev_hdr;
> -	u32				refcount;
> -	bool				remove;
> -};
> -
> -struct ioport_operations {
> -	bool (*io_in)(struct ioport *ioport, struct kvm_cpu *vcpu, u16 port, void *data, int size);
> -	bool (*io_out)(struct ioport *ioport, struct kvm_cpu *vcpu, u16 port, void *data, int size);
> -};
> -
>  void ioport__map_irq(u8 *irq);
>  
> -int __must_check ioport__register(struct kvm *kvm, u16 port, struct ioport_operations *ops,
> -				  int count, void *param);
> -int ioport__unregister(struct kvm *kvm, u16 port);
> -int ioport__init(struct kvm *kvm);
> -int ioport__exit(struct kvm *kvm);
> -
>  static inline u8 ioport__read8(u8 *data)
>  {
>  	return *data;
> diff --git a/include/kvm/kvm.h b/include/kvm/kvm.h
> index 14f9d58b..e70f8ef6 100644
> --- a/include/kvm/kvm.h
> +++ b/include/kvm/kvm.h
> @@ -119,8 +119,6 @@ void kvm__irq_line(struct kvm *kvm, int irq, int level);
>  void kvm__irq_trigger(struct kvm *kvm, int irq);
>  bool kvm__emulate_io(struct kvm_cpu *vcpu, u16 port, void *data, int direction, int size, u32 count);
>  bool kvm__emulate_mmio(struct kvm_cpu *vcpu, u64 phys_addr, u8 *data, u32 len, u8 is_write);
> -bool kvm__emulate_pio(struct kvm_cpu *vcpu, u16 port, void *data,
> -		      int direction, int size, u32 count);
>  int kvm__destroy_mem(struct kvm *kvm, u64 guest_phys, u64 size, void *userspace_addr);
>  int kvm__register_mem(struct kvm *kvm, u64 guest_phys, u64 size, void *userspace_addr,
>  		      enum kvm_mem_type type);
> diff --git a/ioport.c b/ioport.c
> deleted file mode 100644
> index 204d8103..00000000
> --- a/ioport.c
> +++ /dev/null
> @@ -1,173 +0,0 @@
> -#include "kvm/ioport.h"
> -
> -#include "kvm/kvm.h"
> -#include "kvm/util.h"
> -#include "kvm/rbtree-interval.h"
> -#include "kvm/mutex.h"
> -
> -#include <linux/kvm.h>	/* for KVM_EXIT_* */
> -#include <linux/types.h>
> -
> -#include <stdbool.h>
> -#include <limits.h>
> -#include <stdlib.h>
> -#include <stdio.h>
> -
> -#define ioport_node(n) rb_entry(n, struct ioport, node)
> -
> -static DEFINE_MUTEX(ioport_lock);
> -
> -static struct rb_root		ioport_tree = RB_ROOT;
> -
> -static struct ioport *ioport_search(struct rb_root *root, u64 addr)
> -{
> -	struct rb_int_node *node;
> -
> -	node = rb_int_search_single(root, addr);
> -	if (node == NULL)
> -		return NULL;
> -
> -	return ioport_node(node);
> -}
> -
> -static int ioport_insert(struct rb_root *root, struct ioport *data)
> -{
> -	return rb_int_insert(root, &data->node);
> -}
> -
> -static void ioport_remove(struct rb_root *root, struct ioport *data)
> -{
> -	rb_int_erase(root, &data->node);
> -}
> -
> -static struct ioport *ioport_get(struct rb_root *root, u64 addr)
> -{
> -	struct ioport *ioport;
> -
> -	mutex_lock(&ioport_lock);
> -	ioport = ioport_search(root, addr);
> -	if (ioport)
> -		ioport->refcount++;
> -	mutex_unlock(&ioport_lock);
> -
> -	return ioport;
> -}
> -
> -/* Called with ioport_lock held. */
> -static void ioport_unregister(struct rb_root *root, struct ioport *data)
> -{
> -	ioport_remove(root, data);
> -	free(data);
> -}
> -
> -static void ioport_put(struct rb_root *root, struct ioport *data)
> -{
> -	mutex_lock(&ioport_lock);
> -	data->refcount--;
> -	if (data->remove && data->refcount == 0)
> -		ioport_unregister(root, data);
> -	mutex_unlock(&ioport_lock);
> -}
> -
> -int ioport__register(struct kvm *kvm, u16 port, struct ioport_operations *ops, int count, void *param)
> -{
> -	struct ioport *entry;
> -	int r;
> -
> -	entry = malloc(sizeof(*entry));
> -	if (entry == NULL)
> -		return -ENOMEM;
> -
> -	*entry = (struct ioport) {
> -		.node		= RB_INT_INIT(port, port + count),
> -		.ops		= ops,
> -		.priv		= param,
> -		/*
> -		 * Start from 0 because ioport__unregister() doesn't decrement
> -		 * the reference count.
> -		 */
> -		.refcount	= 0,
> -		.remove		= false,
> -	};
> -
> -	mutex_lock(&ioport_lock);
> -	r = ioport_insert(&ioport_tree, entry);
> -	if (r < 0)
> -		goto out_free;
> -	mutex_unlock(&ioport_lock);
> -
> -	return port;
> -
> -out_free:
> -	free(entry);
> -	mutex_unlock(&ioport_lock);
> -	return r;
> -}
> -
> -int ioport__unregister(struct kvm *kvm, u16 port)
> -{
> -	struct ioport *entry;
> -
> -	mutex_lock(&ioport_lock);
> -	entry = ioport_search(&ioport_tree, port);
> -	if (!entry) {
> -		mutex_unlock(&ioport_lock);
> -		return -ENOENT;
> -	}
> -	/* The same reasoning from kvm__deregister_mmio() applies. */
> -	if (entry->refcount == 0)
> -		ioport_unregister(&ioport_tree, entry);
> -	else
> -		entry->remove = true;
> -	mutex_unlock(&ioport_lock);
> -
> -	return 0;
> -}
> -
> -static const char *to_direction(int direction)
> -{
> -	if (direction == KVM_EXIT_IO_IN)
> -		return "IN";
> -	else
> -		return "OUT";
> -}
> -
> -static void ioport_error(u16 port, void *data, int direction, int size, u32 count)
> -{
> -	fprintf(stderr, "IO error: %s port=%x, size=%d, count=%u\n", to_direction(direction), port, size, count);
> -}
> -
> -bool kvm__emulate_io(struct kvm_cpu *vcpu, u16 port, void *data, int direction, int size, u32 count)
> -{
> -	struct ioport_operations *ops;
> -	bool ret = false;
> -	struct ioport *entry;
> -	void *ptr = data;
> -	struct kvm *kvm = vcpu->kvm;
> -
> -	entry = ioport_get(&ioport_tree, port);
> -	if (!entry)
> -		return kvm__emulate_pio(vcpu, port, data, direction,
> -					size, count);
> -
> -	ops	= entry->ops;
> -
> -	while (count--) {
> -		if (direction == KVM_EXIT_IO_IN && ops->io_in)
> -				ret = ops->io_in(entry, vcpu, port, ptr, size);
> -		else if (direction == KVM_EXIT_IO_OUT && ops->io_out)
> -				ret = ops->io_out(entry, vcpu, port, ptr, size);
> -
> -		ptr += size;
> -	}
> -
> -	ioport_put(&ioport_tree, entry);
> -
> -	if (ret)
> -		return true;
> -
> -	if (kvm->cfg.ioport_debug)
> -		ioport_error(port, data, direction, size, count);
> -
> -	return !kvm->cfg.ioport_debug;
> -}
> diff --git a/mmio.c b/mmio.c
> index 4cce1901..5249af39 100644
> --- a/mmio.c
> +++ b/mmio.c
> @@ -206,7 +206,7 @@ out:
>  	return true;
>  }
>  
> -bool kvm__emulate_pio(struct kvm_cpu *vcpu, u16 port, void *data,
> +bool kvm__emulate_io(struct kvm_cpu *vcpu, u16 port, void *data,
>  		     int direction, int size, u32 count)
>  {
>  	struct mmio_mapping *mmio;