host/include/aarch64: Implement aes-round.h

Detect AES in cpuinfo; implement the accel hooks.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

meson.build

@@ -2665,6 +2665,15 @@ config_host_data.set('CONFIG_AVX512BW_OPT', get_option('avx512bw') \
     int main(int argc, char *argv[]) { return bar(argv[0]); }
   '''), error_message: 'AVX512BW not available').allowed())
 
+# For both AArch64 and AArch32, detect if builtins are available.
+config_host_data.set('CONFIG_ARM_AES_BUILTIN', cc.compiles('''
+    #include <arm_neon.h>
+    #ifndef __ARM_FEATURE_AES
+    __attribute__((target("+crypto")))
+    #endif
+    void foo(uint8x16_t *p) { *p = vaesmcq_u8(*p); }
+  '''))
+
 have_pvrdma = get_option('pvrdma') \
   .require(rdma.found(), error_message: 'PVRDMA requires OpenFabrics libraries') \
   .require(cc.compiles(gnu_source_prefix + '''