1 files changed, 89 insertions, 0 deletions
diff --git a/tools/testing/selftests/kvm/x86_64/platform_info_test.c b/tools/testing/selftests/kvm/x86_64/platform_info_test.c
new file mode 100644
index 000000000..310a104d9
--- /dev/null
+++ b/tools/testing/selftests/kvm/x86_64/platform_info_test.c
@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Test for x86 KVM_CAP_MSR_PLATFORM_INFO
+ *
+ * Copyright (C) 2018, Google LLC.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ *
+ * Verifies expected behavior of controlling guest access to
+ * MSR_PLATFORM_INFO.
+ */
+
+#define _GNU_SOURCE /* for program_invocation_short_name */
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+
+#include "test_util.h"
+#include "kvm_util.h"
+#include "processor.h"
+
+#define MSR_PLATFORM_INFO_MAX_TURBO_RATIO 0xff00
+
+static void guest_code(void)
+{
+	uint64_t msr_platform_info;
+
+	for (;;) {
+		msr_platform_info = rdmsr(MSR_PLATFORM_INFO);
+		GUEST_SYNC(msr_platform_info);
+		asm volatile ("inc %r11");
+	}
+}
+
+static void test_msr_platform_info_enabled(struct kvm_vcpu *vcpu)
+{
+	struct kvm_run *run = vcpu->run;
+	struct ucall uc;
+
+	vm_enable_cap(vcpu->vm, KVM_CAP_MSR_PLATFORM_INFO, true);
+	vcpu_run(vcpu);
+	TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
+			"Exit_reason other than KVM_EXIT_IO: %u (%s),\n",
+			run->exit_reason,
+			exit_reason_str(run->exit_reason));
+	get_ucall(vcpu, &uc);
+	TEST_ASSERT(uc.cmd == UCALL_SYNC,
+			"Received ucall other than UCALL_SYNC: %lu\n", uc.cmd);
+	TEST_ASSERT((uc.args[1] & MSR_PLATFORM_INFO_MAX_TURBO_RATIO) ==
+		MSR_PLATFORM_INFO_MAX_TURBO_RATIO,
+		"Expected MSR_PLATFORM_INFO to have max turbo ratio mask: %i.",
+		MSR_PLATFORM_INFO_MAX_TURBO_RATIO);
+}
+
+static void test_msr_platform_info_disabled(struct kvm_vcpu *vcpu)
+{
+	struct kvm_run *run = vcpu->run;
+
+	vm_enable_cap(vcpu->vm, KVM_CAP_MSR_PLATFORM_INFO, false);
+	vcpu_run(vcpu);
+	TEST_ASSERT(run->exit_reason == KVM_EXIT_SHUTDOWN,
+			"Exit_reason other than KVM_EXIT_SHUTDOWN: %u (%s)\n",
+			run->exit_reason,
+			exit_reason_str(run->exit_reason));
+}
+
+int main(int argc, char *argv[])
+{
+	struct kvm_vcpu *vcpu;
+	struct kvm_vm *vm;
+	uint64_t msr_platform_info;
+
+	TEST_REQUIRE(kvm_has_cap(KVM_CAP_MSR_PLATFORM_INFO));
+
+	vm = vm_create_with_one_vcpu(&vcpu, guest_code);
+
+	msr_platform_info = vcpu_get_msr(vcpu, MSR_PLATFORM_INFO);
+	vcpu_set_msr(vcpu, MSR_PLATFORM_INFO,
+		     msr_platform_info | MSR_PLATFORM_INFO_MAX_TURBO_RATIO);
+	test_msr_platform_info_enabled(vcpu);
+	test_msr_platform_info_disabled(vcpu);
+	vcpu_set_msr(vcpu, MSR_PLATFORM_INFO, msr_platform_info);
+
+	kvm_vm_free(vm);
+
+	return 0;
+}