allow plugin to query KVM for supported/emulated CPUIDs

This plumbs calls to KVM_GET_SUPPORTED_CPUID and KVM_GET_EMULATED_CPUID
to be available to plugins.

TEST=cargo test --features plugin; cargo test -p kvm
BUG=chromium:800626

Change-Id: I98879599b5f970c6c2720772658689a505d8abe1
Signed-off-by: Dmitry Torokhov <dtor@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/938674
Reviewed-by: Zach Reizner <zachr@chromium.org>

2 files changed, 72 insertions, 0 deletions

diff --git a/tests/plugin_supported_cpuid.c b/tests/plugin_supported_cpuid.c
new file mode 100644
index 0000000..0acb134
--- /dev/null
+++ b/tests/plugin_supported_cpuid.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright 2018 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include <errno.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "crosvm.h"
+
+int main(int argc, char** argv) {
+    struct crosvm *crosvm;
+    int ret = crosvm_connect(&crosvm);
+    if (ret) {
+        fprintf(stderr, "failed to connect to crosvm: %d\n", ret);
+        return 1;
+    }
+
+    struct kvm_cpuid_entry2 cpuids[100];
+    int n_entries;
+    ret = crosvm_get_supported_cpuid(crosvm, 1, cpuids, &n_entries);
+    if (ret >= 0) {
+        fprintf(stderr,
+                "expected crosvm_get_supported_cpuids to fail with E2BIG\n");
+        return 1;
+    }
+
+    ret = crosvm_get_supported_cpuid(crosvm, 100, cpuids, &n_entries);
+    if (ret < 0) {
+        fprintf(stderr,
+                "unexpected failure of crosvm_get_supported_cpuids: %d\n", ret);
+        return 1;
+    }
+
+    if (n_entries <= 1) {
+        fprintf(stderr,
+                "unexpected number of supported cpuid entries: %d\n",
+                n_entries);
+        return 1;
+    }
+
+    ret = crosvm_get_emulated_cpuid(crosvm, 1, cpuids, &n_entries);
+    if (ret >= 0) {
+        fprintf(stderr,
+                "expected crosvm_get_emulated_cpuids to fail with E2BIG\n");
+        return 1;
+    }
+
+    ret = crosvm_get_emulated_cpuid(crosvm, 100, cpuids, &n_entries);
+    if (ret < 0) {
+        fprintf(stderr,
+                "unexpected failure of crosvm_get_emulated_cpuid: %d\n", ret);
+        return 1;
+    }
+
+    if (n_entries < 1) {
+        fprintf(stderr,
+                "unexpected number of emulated cpuid entries: %d\n", n_entries);
+        return 1;
+    }
+
+    return 0;
+}
diff --git a/tests/plugins.rs b/tests/plugins.rs
index 1a99a43..d036e97 100644
--- a/tests/plugins.rs
+++ b/tests/plugins.rs
@@ -231,6 +231,11 @@ fn test_extensions() {
 }
 
 #[test]
+fn test_supported_cpuid() {
+    test_plugin(include_str!("plugin_supported_cpuid.c"));
+}
+
+#[test]
 fn test_vcpu_pause() {
     test_plugin(include_str!("plugin_vcpu_pause.c"));
 }