1 // SPDX-License-Identifier: GPL-2.0
3 * Test for x86 KVM_CAP_MSR_PLATFORM_INFO
5 * Copyright (C) 2018, Google LLC.
7 * This work is licensed under the terms of the GNU GPL, version 2.
9 * Verifies expected behavior of controlling guest access to
13 #define _GNU_SOURCE /* for program_invocation_short_name */
18 #include <sys/ioctl.h>
20 #include "test_util.h"
22 #include "processor.h"
24 #define MSR_PLATFORM_INFO_MAX_TURBO_RATIO 0xff00
26 static void guest_code(void)
28 uint64_t msr_platform_info;
31 msr_platform_info = rdmsr(MSR_PLATFORM_INFO);
32 GUEST_SYNC(msr_platform_info);
33 asm volatile ("inc %r11");
37 static void test_msr_platform_info_enabled(struct kvm_vcpu *vcpu)
41 vm_enable_cap(vcpu->vm, KVM_CAP_MSR_PLATFORM_INFO, true);
43 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO);
46 TEST_ASSERT(uc.cmd == UCALL_SYNC,
47 "Received ucall other than UCALL_SYNC: %lu", uc.cmd);
48 TEST_ASSERT((uc.args[1] & MSR_PLATFORM_INFO_MAX_TURBO_RATIO) ==
49 MSR_PLATFORM_INFO_MAX_TURBO_RATIO,
50 "Expected MSR_PLATFORM_INFO to have max turbo ratio mask: %i.",
51 MSR_PLATFORM_INFO_MAX_TURBO_RATIO);
54 static void test_msr_platform_info_disabled(struct kvm_vcpu *vcpu)
56 vm_enable_cap(vcpu->vm, KVM_CAP_MSR_PLATFORM_INFO, false);
58 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_SHUTDOWN);
61 int main(int argc, char *argv[])
63 struct kvm_vcpu *vcpu;
65 uint64_t msr_platform_info;
67 TEST_REQUIRE(kvm_has_cap(KVM_CAP_MSR_PLATFORM_INFO));
69 vm = vm_create_with_one_vcpu(&vcpu, guest_code);
71 msr_platform_info = vcpu_get_msr(vcpu, MSR_PLATFORM_INFO);
72 vcpu_set_msr(vcpu, MSR_PLATFORM_INFO,
73 msr_platform_info | MSR_PLATFORM_INFO_MAX_TURBO_RATIO);
74 test_msr_platform_info_enabled(vcpu);
75 test_msr_platform_info_disabled(vcpu);
76 vcpu_set_msr(vcpu, MSR_PLATFORM_INFO, msr_platform_info);