kvm/x86_64/vmx_close_while_nested_test.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * vmx_close_while_nested
0004  *
0005  * Copyright (C) 2019, Red Hat, Inc.
0006  *
0007  * Verify that nothing bad happens if a KVM user exits with open
0008  * file descriptors while executing a nested guest.
0009  */
0010
0011 #include "test_util.h"
0012 #include "kvm_util.h"
0013 #include "processor.h"
0014 #include "vmx.h"
0015
0016 #include <string.h>
0017 #include <sys/ioctl.h>
0018
0019 #include "kselftest.h"
0020
0021 enum {
0022     PORT_L0_EXIT = 0x2000,
0023 };
0024
0025 static void l2_guest_code(void)
0026 {
0027     /* Exit to L0 */
0028     asm volatile("inb %%dx, %%al"
0029              : : [port] "d" (PORT_L0_EXIT) : "rax");
0030 }
0031
0032 static void l1_guest_code(struct vmx_pages *vmx_pages)
0033 {
0034 #define L2_GUEST_STACK_SIZE 64
0035     unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
0036
0037     GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages));
0038     GUEST_ASSERT(load_vmcs(vmx_pages));
0039
0040     /* Prepare the VMCS for L2 execution. */
0041     prepare_vmcs(vmx_pages, l2_guest_code,
0042              &l2_guest_stack[L2_GUEST_STACK_SIZE]);
0043
0044     GUEST_ASSERT(!vmlaunch());
0045     GUEST_ASSERT(0);
0046 }
0047
0048 int main(int argc, char *argv[])
0049 {
0050     vm_vaddr_t vmx_pages_gva;
0051     struct kvm_vcpu *vcpu;
0052     struct kvm_vm *vm;
0053
0054     TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_VMX));
0055
0056     vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code);
0057
0058     /* Allocate VMX pages and shared descriptors (vmx_pages). */
0059     vcpu_alloc_vmx(vm, &vmx_pages_gva);
0060     vcpu_args_set(vcpu, 1, vmx_pages_gva);
0061
0062     for (;;) {
0063         volatile struct kvm_run *run = vcpu->run;
0064         struct ucall uc;
0065
0066         vcpu_run(vcpu);
0067         TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
0068                 "Got exit_reason other than KVM_EXIT_IO: %u (%s)\n",
0069                 run->exit_reason,
0070                 exit_reason_str(run->exit_reason));
0071
0072         if (run->io.port == PORT_L0_EXIT)
0073             break;
0074
0075         switch (get_ucall(vcpu, &uc)) {
0076         case UCALL_ABORT:
0077             REPORT_GUEST_ASSERT(uc);
0078             /* NOT REACHED */
0079         default:
0080             TEST_FAIL("Unknown ucall %lu", uc.cmd);
0081         }
0082     }
0083 }