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
13 #define _GNU_SOURCE /* for program_invocation_short_name */
14 #include <fcntl.h>
15 #include <stdio.h>
16 #include <stdlib.h>
17 #include <string.h>
18 #include <sys/ioctl.h>
19
20 #include "test_util.h"
21 #include "kvm_util.h"
22 #include "processor.h"
23
24 #define MSR_PLATFORM_INFO_MAX_TURBO_RATIO 0xff00
25
guest_code(void)26 static void guest_code(void)
27 {
28 uint64_t msr_platform_info;
29
30 for (;;) {
31 msr_platform_info = rdmsr(MSR_PLATFORM_INFO);
32 GUEST_SYNC(msr_platform_info);
33 asm volatile ("inc %r11");
34 }
35 }
36
test_msr_platform_info_enabled(struct kvm_vcpu * vcpu)37 static void test_msr_platform_info_enabled(struct kvm_vcpu *vcpu)
38 {
39 struct kvm_run *run = vcpu->run;
40 struct ucall uc;
41
42 vm_enable_cap(vcpu->vm, KVM_CAP_MSR_PLATFORM_INFO, true);
43 vcpu_run(vcpu);
44 TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
45 "Exit_reason other than KVM_EXIT_IO: %u (%s),\n",
46 run->exit_reason,
47 exit_reason_str(run->exit_reason));
48 get_ucall(vcpu, &uc);
49 TEST_ASSERT(uc.cmd == UCALL_SYNC,
50 "Received ucall other than UCALL_SYNC: %lu\n", uc.cmd);
51 TEST_ASSERT((uc.args[1] & MSR_PLATFORM_INFO_MAX_TURBO_RATIO) ==
52 MSR_PLATFORM_INFO_MAX_TURBO_RATIO,
53 "Expected MSR_PLATFORM_INFO to have max turbo ratio mask: %i.",
54 MSR_PLATFORM_INFO_MAX_TURBO_RATIO);
55 }
56
test_msr_platform_info_disabled(struct kvm_vcpu * vcpu)57 static void test_msr_platform_info_disabled(struct kvm_vcpu *vcpu)
58 {
59 struct kvm_run *run = vcpu->run;
60
61 vm_enable_cap(vcpu->vm, KVM_CAP_MSR_PLATFORM_INFO, false);
62 vcpu_run(vcpu);
63 TEST_ASSERT(run->exit_reason == KVM_EXIT_SHUTDOWN,
64 "Exit_reason other than KVM_EXIT_SHUTDOWN: %u (%s)\n",
65 run->exit_reason,
66 exit_reason_str(run->exit_reason));
67 }
68
main(int argc,char * argv[])69 int main(int argc, char *argv[])
70 {
71 struct kvm_vcpu *vcpu;
72 struct kvm_vm *vm;
73 uint64_t msr_platform_info;
74
75 /* Tell stdout not to buffer its content */
76 setbuf(stdout, NULL);
77
78 TEST_REQUIRE(kvm_has_cap(KVM_CAP_MSR_PLATFORM_INFO));
79
80 vm = vm_create_with_one_vcpu(&vcpu, guest_code);
81
82 msr_platform_info = vcpu_get_msr(vcpu, MSR_PLATFORM_INFO);
83 vcpu_set_msr(vcpu, MSR_PLATFORM_INFO,
84 msr_platform_info | MSR_PLATFORM_INFO_MAX_TURBO_RATIO);
85 test_msr_platform_info_enabled(vcpu);
86 test_msr_platform_info_disabled(vcpu);
87 vcpu_set_msr(vcpu, MSR_PLATFORM_INFO, msr_platform_info);
88
89 kvm_vm_free(vm);
90
91 return 0;
92 }
93