cryptodev: Add a lkcf-backend for cryptodev

cryptodev: Added a new type of backend named lkcf-backend for
cryptodev. This backend upload asymmetric keys to linux kernel,
and let kernel do the accelerations if possible.
The lkcf stands for Linux Kernel Cryptography Framework.

Signed-off-by: lei he <helei.sig11@bytedance.com>
Message-Id: <20221008085030.70212-5-helei.sig11@bytedance.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

backends/meson.build

@@ -12,6 +12,9 @@ softmmu_ss.add([files(
 softmmu_ss.add(when: 'CONFIG_POSIX', if_true: files('rng-random.c'))
 softmmu_ss.add(when: 'CONFIG_POSIX', if_true: files('hostmem-file.c'))
 softmmu_ss.add(when: 'CONFIG_LINUX', if_true: files('hostmem-memfd.c'))
+if keyutils.found()
+    softmmu_ss.add(keyutils, files('cryptodev-lkcf.c'))
+endif
 if have_vhost_user
   softmmu_ss.add(when: 'CONFIG_VIRTIO', if_true: files('vhost-user.c'))
 endif

include/sysemu/cryptodev.h

@@ -219,6 +219,7 @@ typedef enum CryptoDevBackendOptionsType {
     CRYPTODEV_BACKEND_TYPE_NONE = 0,
     CRYPTODEV_BACKEND_TYPE_BUILTIN = 1,
     CRYPTODEV_BACKEND_TYPE_VHOST_USER = 2,
+    CRYPTODEV_BACKEND_TYPE_LKCF = 3,
     CRYPTODEV_BACKEND_TYPE__MAX,
 } CryptoDevBackendOptionsType;
 

qapi/qom.json

@@ -876,6 +876,7 @@
     'colo-compare',
     'cryptodev-backend',
     'cryptodev-backend-builtin',
+    'cryptodev-backend-lkcf',
     { 'name': 'cryptodev-vhost-user',
       'if': 'CONFIG_VHOST_CRYPTO' },
     'dbus-vmstate',
@@ -944,6 +945,7 @@
       'colo-compare':               'ColoCompareProperties',
       'cryptodev-backend':          'CryptodevBackendProperties',
       'cryptodev-backend-builtin':  'CryptodevBackendProperties',
+      'cryptodev-backend-lkcf':     'CryptodevBackendProperties',
       'cryptodev-vhost-user':       { 'type': 'CryptodevVhostUserProperties',
                                       'if': 'CONFIG_VHOST_CRYPTO' },
       'dbus-vmstate':               'DBusVMStateProperties',