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kvm: factor out core eventfd assign/deassign logic 

This patch factors out core eventfd assign/deassign logic and leaves
the argument checking and bus index selection to callers.

Cc: stable@vger.kernel.org
Cc: Gleb Natapov <gleb@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jason Wang 2015-09-15 14:41:55 +08:00 committed by Paolo Bonzini
parent 8453fecbec
commit 85da11ca58
1 changed files with 50 additions and 35 deletions
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85
virt/kvm/eventfd.c
View File

@ -771,40 +771,14 @@ static enum kvm_bus ioeventfd_bus_from_flags(__u32 flags)
return KVM_MMIO_BUS; return KVM_MMIO_BUS;
} }
static int static int kvm_assign_ioeventfd_idx(struct kvm *kvm,
kvm_assign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args) enum kvm_bus bus_idx,
struct kvm_ioeventfd *args)
{ {
enum kvm_bus bus_idx;
struct _ioeventfd *p;
struct eventfd_ctx *eventfd;
int ret;
bus_idx = ioeventfd_bus_from_flags(args->flags); struct eventfd_ctx *eventfd;
/* must be natural-word sized, or 0 to ignore length */ struct _ioeventfd *p;
switch (args->len) { int ret;
case 0:
case 1:
case 2:
case 4:
case 8:
break;
default:
return -EINVAL;
}
/* check for range overflow */
if (args->addr + args->len < args->addr)
return -EINVAL;
/* check for extra flags that we don't understand */
if (args->flags & ~KVM_IOEVENTFD_VALID_FLAG_MASK)
return -EINVAL;
/* ioeventfd with no length can't be combined with DATAMATCH */
if (!args->len &&
args->flags & (KVM_IOEVENTFD_FLAG_PIO |
KVM_IOEVENTFD_FLAG_DATAMATCH))
return -EINVAL;
eventfd = eventfd_ctx_fdget(args->fd); eventfd = eventfd_ctx_fdget(args->fd);
if (IS_ERR(eventfd)) if (IS_ERR(eventfd))
@ -873,14 +847,13 @@ fail:
} }
static int static int
kvm_deassign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args) kvm_deassign_ioeventfd_idx(struct kvm *kvm, enum kvm_bus bus_idx,
struct kvm_ioeventfd *args)
{ {
enum kvm_bus bus_idx;
struct _ioeventfd *p, *tmp; struct _ioeventfd *p, *tmp;
struct eventfd_ctx *eventfd; struct eventfd_ctx *eventfd;
int ret = -ENOENT; int ret = -ENOENT;
bus_idx = ioeventfd_bus_from_flags(args->flags);
eventfd = eventfd_ctx_fdget(args->fd); eventfd = eventfd_ctx_fdget(args->fd);
if (IS_ERR(eventfd)) if (IS_ERR(eventfd))
return PTR_ERR(eventfd); return PTR_ERR(eventfd);
@ -918,6 +891,48 @@ kvm_deassign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
return ret; return ret;
} }
static int kvm_deassign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
{
enum kvm_bus bus_idx = ioeventfd_bus_from_flags(args->flags);
return kvm_deassign_ioeventfd_idx(kvm, bus_idx, args);
}
static int
kvm_assign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
{
enum kvm_bus bus_idx;
bus_idx = ioeventfd_bus_from_flags(args->flags);
/* must be natural-word sized, or 0 to ignore length */
switch (args->len) {
case 0:
case 1:
case 2:
case 4:
case 8:
break;
default:
return -EINVAL;
}
/* check for range overflow */
if (args->addr + args->len < args->addr)
return -EINVAL;
/* check for extra flags that we don't understand */
if (args->flags & ~KVM_IOEVENTFD_VALID_FLAG_MASK)
return -EINVAL;
/* ioeventfd with no length can't be combined with DATAMATCH */
if (!args->len &&
args->flags & (KVM_IOEVENTFD_FLAG_PIO |
KVM_IOEVENTFD_FLAG_DATAMATCH))
return -EINVAL;
return kvm_assign_ioeventfd_idx(kvm, bus_idx, args);
}
int int
kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args) kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
{ {