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authorAndre Przywara <andre.przywara@arm.com>2015-03-26 17:39:29 +0300
committerMarc Zyngier <marc.zyngier@arm.com>2015-03-27 00:43:12 +0300
commitaf669ac6dc3f66bb56fb9612b9826adac6292794 (patch)
treea9d24d28bc910b423694ec952184f4019780da3c /include/kvm/iodev.h
parente32edf4fd0fa4897e12ca66118ab67bf257e16e4 (diff)
downloadlinux-af669ac6dc3f66bb56fb9612b9826adac6292794.tar.xz
KVM: move iodev.h from virt/kvm/ to include/kvm
iodev.h contains definitions for the kvm_io_bus framework. This is needed both by the generic KVM code in virt/kvm as well as by architecture specific code under arch/. Putting the header file in virt/kvm and using local includes in the architecture part seems at least dodgy to me, so let's move the file into include/kvm, so that a more natural "#include <kvm/iodev.h>" can be used by all of the code. This also solves a problem later when using struct kvm_io_device in arm_vgic.h. Fixing up the FSF address in the GPL header and a wrong include path on the way. Signed-off-by: Andre Przywara <andre.przywara@arm.com> Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'include/kvm/iodev.h')
-rw-r--r--include/kvm/iodev.h76
1 files changed, 76 insertions, 0 deletions
diff --git a/include/kvm/iodev.h b/include/kvm/iodev.h
new file mode 100644
index 000000000000..a6d208b916f5
--- /dev/null
+++ b/include/kvm/iodev.h
@@ -0,0 +1,76 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __KVM_IODEV_H__
+#define __KVM_IODEV_H__
+
+#include <linux/kvm_types.h>
+#include <linux/errno.h>
+
+struct kvm_io_device;
+struct kvm_vcpu;
+
+/**
+ * kvm_io_device_ops are called under kvm slots_lock.
+ * read and write handlers return 0 if the transaction has been handled,
+ * or non-zero to have it passed to the next device.
+ **/
+struct kvm_io_device_ops {
+ int (*read)(struct kvm_vcpu *vcpu,
+ struct kvm_io_device *this,
+ gpa_t addr,
+ int len,
+ void *val);
+ int (*write)(struct kvm_vcpu *vcpu,
+ struct kvm_io_device *this,
+ gpa_t addr,
+ int len,
+ const void *val);
+ void (*destructor)(struct kvm_io_device *this);
+};
+
+
+struct kvm_io_device {
+ const struct kvm_io_device_ops *ops;
+};
+
+static inline void kvm_iodevice_init(struct kvm_io_device *dev,
+ const struct kvm_io_device_ops *ops)
+{
+ dev->ops = ops;
+}
+
+static inline int kvm_iodevice_read(struct kvm_vcpu *vcpu,
+ struct kvm_io_device *dev, gpa_t addr,
+ int l, void *v)
+{
+ return dev->ops->read ? dev->ops->read(vcpu, dev, addr, l, v)
+ : -EOPNOTSUPP;
+}
+
+static inline int kvm_iodevice_write(struct kvm_vcpu *vcpu,
+ struct kvm_io_device *dev, gpa_t addr,
+ int l, const void *v)
+{
+ return dev->ops->write ? dev->ops->write(vcpu, dev, addr, l, v)
+ : -EOPNOTSUPP;
+}
+
+static inline void kvm_iodevice_destructor(struct kvm_io_device *dev)
+{
+ if (dev->ops->destructor)
+ dev->ops->destructor(dev);
+}
+
+#endif /* __KVM_IODEV_H__ */