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 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 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 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 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