LXR linux/tools/testing/selftests/kvm/x86_64/vmx_close_while_nested

   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
  23enum {
  24        PORT_L0_EXIT = 0x2000,
  25};
  26
  27/* The virtual machine object. */
  28static struct kvm_vm *vm;
  29
  30static 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
  37static 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
  53int 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}
  88