1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2019, Red Hat, Inc. 4 * 5 * Verify that nothing bad happens if a KVM user exits with open 6 * file descriptors while executing a nested guest. 7 */ 8 9 #include "test_util.h" 10 #include "kvm_util.h" 11 #include "processor.h" 12 #include "vmx.h" 13 #include "svm_util.h" 14 15 #include <string.h> 16 #include <sys/ioctl.h> 17 18 #include "kselftest.h" 19 20 enum { 21 PORT_L0_EXIT = 0x2000, 22 }; 23 24 static void l2_guest_code(void) 25 { 26 /* Exit to L0 */ 27 asm volatile("inb %%dx, %%al" 28 : : [port] "d" (PORT_L0_EXIT) : "rax"); 29 } 30 31 static void l1_vmx_code(struct vmx_pages *vmx_pages) 32 { 33 GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages)); 34 GUEST_ASSERT(load_vmcs(vmx_pages)); 35 36 /* Prepare the VMCS for L2 execution. */ 37 prepare_vmcs(vmx_pages, l2_guest_code); 38 39 GUEST_ASSERT(!vmlaunch()); 40 GUEST_ASSERT(0); 41 } 42 43 static void l1_svm_code(struct svm_test_data *svm) 44 { 45 /* Prepare the VMCB for L2 execution. */ 46 generic_svm_setup(svm, l2_guest_code); 47 48 run_guest(svm->vmcb, svm->vmcb_gpa); 49 GUEST_ASSERT(0); 50 } 51 52 static void l1_guest_code(void *data) 53 { 54 if (this_cpu_has(X86_FEATURE_VMX)) 55 l1_vmx_code(data); 56 else 57 l1_svm_code(data); 58 } 59 60 int main(int argc, char *argv[]) 61 { 62 gva_t guest_gva; 63 struct kvm_vcpu *vcpu; 64 struct kvm_vm *vm; 65 66 TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_VMX) || 67 kvm_cpu_has(X86_FEATURE_SVM)); 68 69 vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code); 70 71 if (kvm_cpu_has(X86_FEATURE_VMX)) 72 vcpu_alloc_vmx(vm, &guest_gva); 73 else 74 vcpu_alloc_svm(vm, &guest_gva); 75 76 vcpu_args_set(vcpu, 1, guest_gva); 77 78 for (;;) { 79 volatile struct kvm_run *run = vcpu->run; 80 struct ucall uc; 81 82 vcpu_run(vcpu); 83 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO); 84 85 if (run->io.port == PORT_L0_EXIT) 86 break; 87 88 switch (get_ucall(vcpu, &uc)) { 89 case UCALL_ABORT: 90 REPORT_GUEST_ASSERT(uc); 91 /* NOT REACHED */ 92 default: 93 TEST_FAIL("Unknown ucall %lu", uc.cmd); 94 } 95 } 96 } 97