platform_info_test.c

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Test for x86 KVM_CAP_MSR_PLATFORM_INFO
 4 *
 5 * Copyright (C) 2018, Google LLC.
 6 *
 7 * This work is licensed under the terms of the GNU GPL, version 2.
 8 *
 9 * Verifies expected behavior of controlling guest access to
10 * MSR_PLATFORM_INFO.
11 */
12#include <fcntl.h>
13#include <stdio.h>
14#include <stdlib.h>
15#include <string.h>
16#include <sys/ioctl.h>
17
18#include "test_util.h"
19#include "kvm_util.h"
20#include "processor.h"
21
22#define MSR_PLATFORM_INFO_MAX_TURBO_RATIO 0xff00
23
24static void guest_code(void)
25{
26	uint64_t msr_platform_info;
27	uint8_t vector;
28
29	GUEST_SYNC(true);
30	msr_platform_info = rdmsr(MSR_PLATFORM_INFO);
31	GUEST_ASSERT_EQ(msr_platform_info & MSR_PLATFORM_INFO_MAX_TURBO_RATIO,
32			MSR_PLATFORM_INFO_MAX_TURBO_RATIO);
33
34	GUEST_SYNC(false);
35	vector = rdmsr_safe(MSR_PLATFORM_INFO, &msr_platform_info);
36	GUEST_ASSERT_EQ(vector, GP_VECTOR);
37
38	GUEST_DONE();
39}
40
41int main(int argc, char *argv[])
42{
43	struct kvm_vcpu *vcpu;
44	struct kvm_vm *vm;
45	uint64_t msr_platform_info;
46	struct ucall uc;
47
48	TEST_REQUIRE(kvm_has_cap(KVM_CAP_MSR_PLATFORM_INFO));
49
50	vm = vm_create_with_one_vcpu(&vcpu, guest_code);
51
52	msr_platform_info = vcpu_get_msr(vcpu, MSR_PLATFORM_INFO);
53	vcpu_set_msr(vcpu, MSR_PLATFORM_INFO,
54		     msr_platform_info | MSR_PLATFORM_INFO_MAX_TURBO_RATIO);
55
56	for (;;) {
57		vcpu_run(vcpu);
58		TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO);
59
60		switch (get_ucall(vcpu, &uc)) {
61		case UCALL_SYNC:
62			vm_enable_cap(vm, KVM_CAP_MSR_PLATFORM_INFO, uc.args[1]);
63			break;
64		case UCALL_DONE:
65			goto done;
66		case UCALL_ABORT:
67			REPORT_GUEST_ASSERT(uc);
68		default:
69			TEST_FAIL("Unexpected ucall %lu", uc.cmd);
70			break;
71		}
72	}
73
74done:
75	kvm_vm_free(vm);
76
77	return 0;
78}