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 #include <fcntl.h> 13 #include <stdio.h> 14 #include <stdlib.h> 15 #include <string.h> 16 #include <sys/ioctl.h> 17 18 #include "test_util.h" 19 #include "kvm_util.h" 20 #include "processor.h" 21 22 #define MSR_PLATFORM_INFO_MAX_TURBO_RATIO 0xff00 23 24 static void guest_code(void) 25 { 26 uint64_t msr_platform_info; 27 uint8_t vector; 28 29 GUEST_SYNC(true); 30 msr_platform_info = rdmsr(MSR_PLATFORM_INFO); 31 GUEST_ASSERT_EQ(msr_platform_info & MSR_PLATFORM_INFO_MAX_TURBO_RATIO, 32 MSR_PLATFORM_INFO_MAX_TURBO_RATIO); 33 34 GUEST_SYNC(false); 35 vector = rdmsr_safe(MSR_PLATFORM_INFO, &msr_platform_info); 36 GUEST_ASSERT_EQ(vector, GP_VECTOR); 37 38 GUEST_DONE(); 39 } 40 41 int main(int argc, char *argv[]) 42 { 43 struct kvm_vcpu *vcpu; 44 struct kvm_vm *vm; 45 uint64_t msr_platform_info; 46 struct ucall uc; 47 48 TEST_REQUIRE(kvm_has_cap(KVM_CAP_MSR_PLATFORM_INFO)); 49 50 vm = vm_create_with_one_vcpu(&vcpu, guest_code); 51 52 msr_platform_info = vcpu_get_msr(vcpu, MSR_PLATFORM_INFO); 53 vcpu_set_msr(vcpu, MSR_PLATFORM_INFO, 54 msr_platform_info | MSR_PLATFORM_INFO_MAX_TURBO_RATIO); 55 56 for (;;) { 57 vcpu_run(vcpu); 58 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO); 59 60 switch (get_ucall(vcpu, &uc)) { 61 case UCALL_SYNC: 62 vm_enable_cap(vm, KVM_CAP_MSR_PLATFORM_INFO, uc.args[1]); 63 break; 64 case UCALL_DONE: 65 goto done; 66 case UCALL_ABORT: 67 REPORT_GUEST_ASSERT(uc); 68 default: 69 TEST_FAIL("Unexpected ucall %lu", uc.cmd); 70 break; 71 } 72 } 73 74 done: 75 kvm_vm_free(vm); 76 77 return 0; 78 } 79