1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * CR4 and CPUID sync test 4 * 5 * Copyright 2018, Red Hat, Inc. and/or its affiliates. 6 * 7 * Author: 8 * Wei Huang <wei@redhat.com> 9 */ 10 11 #include <fcntl.h> 12 #include <stdio.h> 13 #include <stdlib.h> 14 #include <string.h> 15 #include <sys/ioctl.h> 16 17 #include "test_util.h" 18 19 #include "kvm_util.h" 20 #include "processor.h" 21 22 static inline bool cr4_cpuid_is_sync(void) 23 { 24 uint64_t cr4 = get_cr4(); 25 26 return (this_cpu_has(X86_FEATURE_OSXSAVE) == !!(cr4 & X86_CR4_OSXSAVE)); 27 } 28 29 static void guest_code(void) 30 { 31 uint64_t cr4; 32 33 /* turn on CR4.OSXSAVE */ 34 cr4 = get_cr4(); 35 cr4 |= X86_CR4_OSXSAVE; 36 set_cr4(cr4); 37 38 /* verify CR4.OSXSAVE == CPUID.OSXSAVE */ 39 GUEST_ASSERT(cr4_cpuid_is_sync()); 40 41 /* notify hypervisor to change CR4 */ 42 GUEST_SYNC(0); 43 44 /* check again */ 45 GUEST_ASSERT(cr4_cpuid_is_sync()); 46 47 GUEST_DONE(); 48 } 49 50 int main(int argc, char *argv[]) 51 { 52 struct kvm_vcpu *vcpu; 53 struct kvm_run *run; 54 struct kvm_vm *vm; 55 struct kvm_sregs sregs; 56 struct ucall uc; 57 58 TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_XSAVE)); 59 60 /* Tell stdout not to buffer its content */ 61 setbuf(stdout, NULL); 62 63 vm = vm_create_with_one_vcpu(&vcpu, guest_code); 64 run = vcpu->run; 65 66 while (1) { 67 vcpu_run(vcpu); 68 69 TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, 70 "Unexpected exit reason: %u (%s),\n", 71 run->exit_reason, 72 exit_reason_str(run->exit_reason)); 73 74 switch (get_ucall(vcpu, &uc)) { 75 case UCALL_SYNC: 76 /* emulate hypervisor clearing CR4.OSXSAVE */ 77 vcpu_sregs_get(vcpu, &sregs); 78 sregs.cr4 &= ~X86_CR4_OSXSAVE; 79 vcpu_sregs_set(vcpu, &sregs); 80 break; 81 case UCALL_ABORT: 82 REPORT_GUEST_ASSERT(uc); 83 break; 84 case UCALL_DONE: 85 goto done; 86 default: 87 TEST_FAIL("Unknown ucall %lu", uc.cmd); 88 } 89 } 90 91 done: 92 kvm_vm_free(vm); 93 return 0; 94 } 95