tools/testing/selftests/kvm/x86/triple_fault_event_test.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 #include "test_util.h"
   3 #include "kvm_util.h"
   4 #include "processor.h"
   5 #include "vmx.h"
   6 #include "svm_util.h"
   7
   8 #include <string.h>
   9 #include <sys/ioctl.h>
  10
  11 #include "kselftest.h"
  12
  13 #define ARBITRARY_IO_PORT       0x2000
  14
  15 /* The virtual machine object. */
  16 static struct kvm_vm *vm;
  17
  18 static void l2_guest_code(void)
  19 {
  20         asm volatile("inb %%dx, %%al"
  21                      : : [port] "d" (ARBITRARY_IO_PORT) : "rax");
  22 }
  23
  24 #define L2_GUEST_STACK_SIZE 64
  25 unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
  26
  27 void l1_guest_code_vmx(struct vmx_pages *vmx)
  28 {
  29
  30         GUEST_ASSERT(vmx->vmcs_gpa);
  31         GUEST_ASSERT(prepare_for_vmx_operation(vmx));
  32         GUEST_ASSERT(load_vmcs(vmx));
  33
  34         prepare_vmcs(vmx, l2_guest_code,
  35                      &l2_guest_stack[L2_GUEST_STACK_SIZE]);
  36
  37         GUEST_ASSERT(!vmlaunch());
  38         /* L2 should triple fault after a triple fault event injected. */
  39         GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_TRIPLE_FAULT);
  40         GUEST_DONE();
  41 }
  42
  43 void l1_guest_code_svm(struct svm_test_data *svm)
  44 {
  45         struct vmcb *vmcb = svm->vmcb;
  46
  47         generic_svm_setup(svm, l2_guest_code,
  48                         &l2_guest_stack[L2_GUEST_STACK_SIZE]);
  49
  50         /* don't intercept shutdown to test the case of SVM allowing to do so */
  51         vmcb->control.intercept &= ~(BIT(INTERCEPT_SHUTDOWN));
  52
  53         run_guest(vmcb, svm->vmcb_gpa);
  54
  55         /* should not reach here, L1 should crash  */
  56         GUEST_ASSERT(0);
  57 }
  58
  59 int main(void)
  60 {
  61         struct kvm_vcpu *vcpu;
  62         struct kvm_run *run;
  63         struct kvm_vcpu_events events;
  64         struct ucall uc;
  65
  66         bool has_vmx = kvm_cpu_has(X86_FEATURE_VMX);
  67         bool has_svm = kvm_cpu_has(X86_FEATURE_SVM);
  68
  69         TEST_REQUIRE(has_vmx || has_svm);
  70
  71         TEST_REQUIRE(kvm_has_cap(KVM_CAP_X86_TRIPLE_FAULT_EVENT));
  72
  73
  74         if (has_vmx) {
  75                 vm_vaddr_t vmx_pages_gva;
  76
  77                 vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code_vmx);
  78                 vcpu_alloc_vmx(vm, &vmx_pages_gva);
  79                 vcpu_args_set(vcpu, 1, vmx_pages_gva);
  80         } else {
  81                 vm_vaddr_t svm_gva;
  82
  83                 vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code_svm);
  84                 vcpu_alloc_svm(vm, &svm_gva);
  85                 vcpu_args_set(vcpu, 1, svm_gva);
  86         }
  87
  88         vm_enable_cap(vm, KVM_CAP_X86_TRIPLE_FAULT_EVENT, 1);
  89         run = vcpu->run;
  90         vcpu_run(vcpu);
  91
  92         TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO);
  93         TEST_ASSERT(run->io.port == ARBITRARY_IO_PORT,
  94                     "Expected IN from port %d from L2, got port %d",
  95                     ARBITRARY_IO_PORT, run->io.port);
  96         vcpu_events_get(vcpu, &events);
  97         events.flags |= KVM_VCPUEVENT_VALID_TRIPLE_FAULT;
  98         events.triple_fault.pending = true;
  99         vcpu_events_set(vcpu, &events);
 100         run->immediate_exit = true;
 101         vcpu_run_complete_io(vcpu);
 102
 103         vcpu_events_get(vcpu, &events);
 104         TEST_ASSERT(events.flags & KVM_VCPUEVENT_VALID_TRIPLE_FAULT,
 105                     "Triple fault event invalid");
 106         TEST_ASSERT(events.triple_fault.pending,
 107                     "No triple fault pending");
 108         vcpu_run(vcpu);
 109
 110
 111         if (has_svm) {
 112                 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_SHUTDOWN);
 113         } else {
 114                 switch (get_ucall(vcpu, &uc)) {
 115                 case UCALL_DONE:
 116                         break;
 117                 case UCALL_ABORT:
 118                         REPORT_GUEST_ASSERT(uc);
 119                 default:
 120                         TEST_FAIL("Unexpected ucall: %lu", uc.cmd);
 121                 }
 122         }
 123         return 0;
 124 }