diff options
author | Jason Wang <jasowang@redhat.com> | 2015-09-15 14:41:55 +0800 |
---|---|---|
committer | Luis Henriques <luis.henriques@canonical.com> | 2015-10-06 11:52:28 +0100 |
commit | bd50ab6db837d0bd2f48da72fce2319c02b4fe90 (patch) | |
tree | 30b85485ea96f94c4afe0b5a8be64616c0bb7071 /virt | |
parent | bc0941e3d57dbe9cc031179399dac3078de71bd4 (diff) |
kvm: factor out core eventfd assign/deassign logic
commit 85da11ca587c8eb73993a1b503052391a73586f9 upstream.
This patch factors out core eventfd assign/deassign logic and leaves
the argument checking and bus index selection to callers.
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>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Diffstat (limited to 'virt')
-rw-r--r-- | virt/kvm/eventfd.c | 85 |
1 files changed, 50 insertions, 35 deletions
diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c index 47e48e2c7d1a..5a62748c49b9 100644 --- a/virt/kvm/eventfd.c +++ b/virt/kvm/eventfd.c @@ -703,40 +703,14 @@ static enum kvm_bus ioeventfd_bus_from_flags(__u32 flags) return KVM_MMIO_BUS; } -static int -kvm_assign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args) +static int kvm_assign_ioeventfd_idx(struct kvm *kvm, + 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); - /* 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; + struct eventfd_ctx *eventfd; + struct _ioeventfd *p; + int ret; eventfd = eventfd_ctx_fdget(args->fd); if (IS_ERR(eventfd)) @@ -805,14 +779,13 @@ fail: } 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 eventfd_ctx *eventfd; int ret = -ENOENT; - bus_idx = ioeventfd_bus_from_flags(args->flags); eventfd = eventfd_ctx_fdget(args->fd); if (IS_ERR(eventfd)) return PTR_ERR(eventfd); @@ -850,6 +823,48 @@ kvm_deassign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args) 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 kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args) { |