diff options
| author | Cornelia Huck <cornelia.huck@de.ibm.com> | 2013-02-28 12:33:20 +0100 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2013-03-05 23:12:17 +0100 |
| commit | 2b83451b45d720ca38c03878ce42ff9139cad9e3 (patch) | |
| tree | 374b4ab82ffc115dc8cb76f783f7735521b6c7bf /virt/kvm/eventfd.c | |
| parent | KVM: Introduce KVM_VIRTIO_CCW_NOTIFY_BUS. (diff) | |
| download | linux-2b83451b45d720ca38c03878ce42ff9139cad9e3.tar.xz linux-2b83451b45d720ca38c03878ce42ff9139cad9e3.zip | |
KVM: ioeventfd for virtio-ccw devices.
Enhance KVM_IOEVENTFD with a new flag that allows to attach to virtio-ccw
devices on s390 via the KVM_VIRTIO_CCW_NOTIFY_BUS.
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'virt/kvm/eventfd.c')
| -rw-r--r-- | virt/kvm/eventfd.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c index 0b6fe69bb03d..020522ed9094 100644 --- a/virt/kvm/eventfd.c +++ b/virt/kvm/eventfd.c @@ -674,15 +674,24 @@ ioeventfd_check_collision(struct kvm *kvm, struct _ioeventfd *p) return false; } +static enum kvm_bus ioeventfd_bus_from_flags(__u32 flags) +{ + if (flags & KVM_IOEVENTFD_FLAG_PIO) + return KVM_PIO_BUS; + if (flags & KVM_IOEVENTFD_FLAG_VIRTIO_CCW_NOTIFY) + return KVM_VIRTIO_CCW_NOTIFY_BUS; + return KVM_MMIO_BUS; +} + static int kvm_assign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args) { - int pio = args->flags & KVM_IOEVENTFD_FLAG_PIO; - enum kvm_bus bus_idx = pio ? KVM_PIO_BUS : KVM_MMIO_BUS; + 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 */ switch (args->len) { case 1: @@ -757,12 +766,12 @@ fail: static int kvm_deassign_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args) { - int pio = args->flags & KVM_IOEVENTFD_FLAG_PIO; - enum kvm_bus bus_idx = pio ? KVM_PIO_BUS : KVM_MMIO_BUS; + 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); |