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 VCPU_ID 0 25 #define MSR_PLATFORM_INFO_MAX_TURBO_RATIO 0xff00 26 27 static void guest_code(void) 28 { 29 uint64_t msr_platform_info; 30 31 for (;;) { 32 msr_platform_info = rdmsr(MSR_PLATFORM_INFO); 33 GUEST_SYNC(msr_platform_info); 34 asm volatile ("inc %r11"); 35 } 36 } 37 38 static void set_msr_platform_info_enabled(struct kvm_vm *vm, bool enable) 39 { 40 struct kvm_enable_cap cap = {}; 41 42 cap.cap = KVM_CAP_MSR_PLATFORM_INFO; 43 cap.flags = 0; 44 cap.args[0] = (int)enable; 45 vm_enable_cap(vm, &cap); 46 } 47 48 static void test_msr_platform_info_enabled(struct kvm_vm *vm) 49 { 50 struct kvm_run *run = vcpu_state(vm, VCPU_ID); 51 struct ucall uc; 52 53 set_msr_platform_info_enabled(vm, true); 54 vcpu_run(vm, VCPU_ID); 55 TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, 56 "Exit_reason other than KVM_EXIT_IO: %u (%s),\n", 57 run->exit_reason, 58 exit_reason_str(run->exit_reason)); 59 get_ucall(vm, VCPU_ID, &uc); 60 TEST_ASSERT(uc.cmd == UCALL_SYNC, 61 "Received ucall other than UCALL_SYNC: %u\n", 62 ucall); 63 TEST_ASSERT((uc.args[1] & MSR_PLATFORM_INFO_MAX_TURBO_RATIO) == 64 MSR_PLATFORM_INFO_MAX_TURBO_RATIO, 65 "Expected MSR_PLATFORM_INFO to have max turbo ratio mask: %i.", 66 MSR_PLATFORM_INFO_MAX_TURBO_RATIO); 67 } 68 69 static void test_msr_platform_info_disabled(struct kvm_vm *vm) 70 { 71 struct kvm_run *run = vcpu_state(vm, VCPU_ID); 72 73 set_msr_platform_info_enabled(vm, false); 74 vcpu_run(vm, VCPU_ID); 75 TEST_ASSERT(run->exit_reason == KVM_EXIT_SHUTDOWN, 76 "Exit_reason other than KVM_EXIT_SHUTDOWN: %u (%s)\n", 77 run->exit_reason, 78 exit_reason_str(run->exit_reason)); 79 } 80 81 int main(int argc, char *argv[]) 82 { 83 struct kvm_vm *vm; 84 struct kvm_run *state; 85 int rv; 86 uint64_t msr_platform_info; 87 88 /* Tell stdout not to buffer its content */ 89 setbuf(stdout, NULL); 90 91 rv = kvm_check_cap(KVM_CAP_MSR_PLATFORM_INFO); 92 if (!rv) { 93 fprintf(stderr, 94 "KVM_CAP_MSR_PLATFORM_INFO not supported, skip test\n"); 95 exit(KSFT_SKIP); 96 } 97 98 vm = vm_create_default(VCPU_ID, 0, guest_code); 99 100 msr_platform_info = vcpu_get_msr(vm, VCPU_ID, MSR_PLATFORM_INFO); 101 vcpu_set_msr(vm, VCPU_ID, MSR_PLATFORM_INFO, 102 msr_platform_info | MSR_PLATFORM_INFO_MAX_TURBO_RATIO); 103 test_msr_platform_info_disabled(vm); 104 test_msr_platform_info_enabled(vm); 105 vcpu_set_msr(vm, VCPU_ID, MSR_PLATFORM_INFO, msr_platform_info); 106 107 kvm_vm_free(vm); 108 109 return 0; 110 } 111
