summaryrefslogtreecommitdiff
path: root/arch/s390/include/uapi/asm/kvm_virtio.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/s390/include/uapi/asm/kvm_virtio.h')
-rw-r--r--arch/s390/include/uapi/asm/kvm_virtio.h64
1 files changed, 64 insertions, 0 deletions
diff --git a/arch/s390/include/uapi/asm/kvm_virtio.h b/arch/s390/include/uapi/asm/kvm_virtio.h
new file mode 100644
index 000000000000..44a438ca9e72
--- /dev/null
+++ b/arch/s390/include/uapi/asm/kvm_virtio.h
@@ -0,0 +1,64 @@
+/*
+ * definition for virtio for kvm on s390
+ *
+ * Copyright IBM Corp. 2008
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (version 2 only)
+ * as published by the Free Software Foundation.
+ *
+ * Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
+ */
+
+#ifndef __KVM_S390_VIRTIO_H
+#define __KVM_S390_VIRTIO_H
+
+#include <linux/types.h>
+
+struct kvm_device_desc {
+ /* The device type: console, network, disk etc. Type 0 terminates. */
+ __u8 type;
+ /* The number of virtqueues (first in config array) */
+ __u8 num_vq;
+ /*
+ * The number of bytes of feature bits. Multiply by 2: one for host
+ * features and one for guest acknowledgements.
+ */
+ __u8 feature_len;
+ /* The number of bytes of the config array after virtqueues. */
+ __u8 config_len;
+ /* A status byte, written by the Guest. */
+ __u8 status;
+ __u8 config[0];
+};
+
+/*
+ * This is how we expect the device configuration field for a virtqueue
+ * to be laid out in config space.
+ */
+struct kvm_vqconfig {
+ /* The token returned with an interrupt. Set by the guest */
+ __u64 token;
+ /* The address of the virtio ring */
+ __u64 address;
+ /* The number of entries in the virtio_ring */
+ __u16 num;
+
+};
+
+#define KVM_S390_VIRTIO_NOTIFY 0
+#define KVM_S390_VIRTIO_RESET 1
+#define KVM_S390_VIRTIO_SET_STATUS 2
+
+/* The alignment to use between consumer and producer parts of vring.
+ * This is pagesize for historical reasons. */
+#define KVM_S390_VIRTIO_RING_ALIGN 4096
+
+
+/* These values are supposed to be in ext_params on an interrupt */
+#define VIRTIO_PARAM_MASK 0xff
+#define VIRTIO_PARAM_VRING_INTERRUPT 0x0
+#define VIRTIO_PARAM_CONFIG_CHANGED 0x1
+#define VIRTIO_PARAM_DEV_ADD 0x2
+
+#endif