Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 120 insertions, 0 deletions

diff --git a/include/hw/s390x/storage-keys.h b/include/hw/s390x/storage-keys.h
new file mode 100644
index 000000000..aa2ec2aae
--- /dev/null
+++ b/include/hw/s390x/storage-keys.h
@@ -0,0 +1,120 @@
+/*
+ * s390 storage key device
+ *
+ * Copyright 2015 IBM Corp.
+ * Author(s): Jason J. Herne <jjherne@linux.vnet.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or (at
+ * your option) any later version. See the COPYING file in the top-level
+ * directory.
+ */
+
+#ifndef S390_STORAGE_KEYS_H
+#define S390_STORAGE_KEYS_H
+
+#include "hw/qdev-core.h"
+#include "monitor/monitor.h"
+#include "qom/object.h"
+
+#define TYPE_S390_SKEYS "s390-skeys"
+OBJECT_DECLARE_TYPE(S390SKeysState, S390SKeysClass, S390_SKEYS)
+
+struct S390SKeysState {
+    DeviceState parent_obj;
+    bool migration_enabled;
+
+};
+
+
+struct S390SKeysClass {
+    DeviceClass parent_class;
+
+    /**
+     * @skeys_are_enabled:
+     *
+     * Check whether storage keys are enabled. If not enabled, they were not
+     * enabled lazily either by the guest via a storage key instruction or
+     * by the host during migration.
+     *
+     * If disabled, everything not explicitly triggered by the guest,
+     * such as outgoing migration or dirty/change tracking, should not touch
+     * storage keys and should not lazily enable it.
+     *
+     * @ks: the #S390SKeysState
+     *
+     * Returns false if not enabled and true if enabled.
+     */
+    bool (*skeys_are_enabled)(S390SKeysState *ks);
+
+    /**
+     * @enable_skeys:
+     *
+     * Lazily enable storage keys. If this function is not implemented,
+     * setting a storage key will lazily enable storage keys implicitly
+     * instead. TCG guests have to make sure to flush the TLB of all CPUs
+     * if storage keys were not enabled before this call.
+     *
+     * @ks: the #S390SKeysState
+     *
+     * Returns false if not enabled before this call, and true if already
+     * enabled.
+     */
+    bool (*enable_skeys)(S390SKeysState *ks);
+
+    /**
+     * @get_skeys:
+     *
+     * Get storage keys for the given PFN range. This call will fail if
+     * storage keys have not been lazily enabled yet.
+     *
+     * Callers have to validate that a GFN is valid before this call.
+     *
+     * @ks: the #S390SKeysState
+     * @start_gfn: the start GFN to get storage keys for
+     * @count: the number of storage keys to get
+     * @keys: the byte array where storage keys will be stored to
+     *
+     * Returns 0 on success, returns an error if getting a storage key failed.
+     */
+    int (*get_skeys)(S390SKeysState *ks, uint64_t start_gfn, uint64_t count,
+                     uint8_t *keys);
+    /**
+     * @set_skeys:
+     *
+     * Set storage keys for the given PFN range. This call will fail if
+     * storage keys have not been lazily enabled yet and implicit
+     * enablement is not supported.
+     *
+     * Callers have to validate that a GFN is valid before this call.
+     *
+     * @ks: the #S390SKeysState
+     * @start_gfn: the start GFN to set storage keys for
+     * @count: the number of storage keys to set
+     * @keys: the byte array where storage keys will be read from
+     *
+     * Returns 0 on success, returns an error if setting a storage key failed.
+     */
+    int (*set_skeys)(S390SKeysState *ks, uint64_t start_gfn, uint64_t count,
+                     uint8_t *keys);
+};
+
+#define TYPE_KVM_S390_SKEYS "s390-skeys-kvm"
+#define TYPE_QEMU_S390_SKEYS "s390-skeys-qemu"
+typedef struct QEMUS390SKeysState QEMUS390SKeysState;
+DECLARE_INSTANCE_CHECKER(QEMUS390SKeysState, QEMU_S390_SKEYS,
+                         TYPE_QEMU_S390_SKEYS)
+
+struct QEMUS390SKeysState {
+    S390SKeysState parent_obj;
+    uint8_t *keydata;
+    uint32_t key_count;
+};
+
+void s390_skeys_init(void);
+
+S390SKeysState *s390_get_skeys_device(void);
+
+void hmp_dump_skeys(Monitor *mon, const QDict *qdict);
+void hmp_info_skeys(Monitor *mon, const QDict *qdict);
+
+#endif /* S390_STORAGE_KEYS_H */