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 ucall uc; 40 41 vm_enable_cap(vcpu->vm, KVM_CAP_MSR_PLATFORM_INFO, true); 42 vcpu_run(vcpu); 43 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO); 44 45 get_ucall(vcpu, &uc); 46 TEST_ASSERT(uc.cmd == UCALL_SYNC, 47 "Received ucall other than UCALL_SYNC: %lu\n", 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); 52 } 53 54 static void test_msr_platform_info_disabled(struct kvm_vcpu *vcpu) 55 { 56 vm_enable_cap(vcpu->vm, KVM_CAP_MSR_PLATFORM_INFO, false); 57 vcpu_run(vcpu); 58 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_SHUTDOWN); 59 } 60 61 int main(int argc, char *argv[]) 62 { 63 struct kvm_vcpu *vcpu; 64 struct kvm_vm *vm; 65 uint64_t msr_platform_info; 66 67 TEST_REQUIRE(kvm_has_cap(KVM_CAP_MSR_PLATFORM_INFO)); 68 69 vm = vm_create_with_one_vcpu(&vcpu, guest_code); 70 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); 77 78 kvm_vm_free(vm); 79 80 return 0; 81 } 82