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. */
 16static struct kvm_vm *vm;
 17
 18static 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
 25unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
 26
 27void 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
 43void 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
 59int 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}