tools/testing/selftests/kvm/x86_64/vmx_close_while_nested_test.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * vmx_close_while_nested
   4  *
   5  * Copyright (C) 2019, Red Hat, Inc.
   6  *
   7  * Verify that nothing bad happens if a KVM user exits with open
   8  * file descriptors while executing a nested guest.
   9  */
  10
  11 #include "test_util.h"
  12 #include "kvm_util.h"
  13 #include "processor.h"
  14 #include "vmx.h"
  15
  16 #include <string.h>
  17 #include <sys/ioctl.h>
  18
  19 #include "kselftest.h"
  20
  21 #define VCPU_ID         5
  22
  23 enum {
  24         PORT_L0_EXIT = 0x2000,
  25 };
  26
  27 /* The virtual machine object. */
  28 static struct kvm_vm *vm;
  29
  30 static void l2_guest_code(void)
  31 {
  32         /* Exit to L0 */
  33         asm volatile("inb %%dx, %%al"
  34                      : : [port] "d" (PORT_L0_EXIT) : "rax");
  35 }
  36
  37 static void l1_guest_code(struct vmx_pages *vmx_pages)
  38 {
  39 #define L2_GUEST_STACK_SIZE 64
  40         unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
  41
  42         GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages));
  43         GUEST_ASSERT(load_vmcs(vmx_pages));
  44
  45         /* Prepare the VMCS for L2 execution. */
  46         prepare_vmcs(vmx_pages, l2_guest_code,
  47                      &l2_guest_stack[L2_GUEST_STACK_SIZE]);
  48
  49         GUEST_ASSERT(!vmlaunch());
  50         GUEST_ASSERT(0);
  51 }
  52
  53 int main(int argc, char *argv[])
  54 {
  55         vm_vaddr_t vmx_pages_gva;
  56
  57         nested_vmx_check_supported();
  58
  59         vm = vm_create_default(VCPU_ID, 0, (void *) l1_guest_code);
  60         vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
  61
  62         /* Allocate VMX pages and shared descriptors (vmx_pages). */
  63         vcpu_alloc_vmx(vm, &vmx_pages_gva);
  64         vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);
  65
  66         for (;;) {
  67                 volatile struct kvm_run *run = vcpu_state(vm, VCPU_ID);
  68                 struct ucall uc;
  69
  70                 vcpu_run(vm, VCPU_ID);
  71                 TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
  72                             "Got exit_reason other than KVM_EXIT_IO: %u (%s)\n",
  73                             run->exit_reason,
  74                             exit_reason_str(run->exit_reason));
  75
  76                 if (run->io.port == PORT_L0_EXIT)
  77                         break;
  78
  79                 switch (get_ucall(vm, VCPU_ID, &uc)) {
  80                 case UCALL_ABORT:
  81                         TEST_FAIL("%s", (const char *)uc.args[0]);
  82                         /* NOT REACHED */
  83                 default:
  84                         TEST_FAIL("Unknown ucall %lu", uc.cmd);
  85                 }
  86         }
  87 }