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

Alexandru Elisei
2021-02-17T15:50:30Z

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;