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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * svm_int_ctl_test
   4  *
   5  * Copyright (C) 2021, Red Hat, Inc.
   6  *
   7  * Nested SVM testing: test simultaneous use of V_IRQ from L1 and L0.
   8  */
   9
  10 #include "test_util.h"
  11 #include "kvm_util.h"
  12 #include "processor.h"
  13 #include "svm_util.h"
  14 #include "apic.h"
  15
  16 #define VCPU_ID         0
  17
  18 static struct kvm_vm *vm;
  19
  20 bool vintr_irq_called;
  21 bool intr_irq_called;
  22
  23 #define VINTR_IRQ_NUMBER 0x20
  24 #define INTR_IRQ_NUMBER 0x30
  25
  26 static void vintr_irq_handler(struct ex_regs *regs)
  27 {
  28         vintr_irq_called = true;
  29 }
  30
  31 static void intr_irq_handler(struct ex_regs *regs)
  32 {
  33         x2apic_write_reg(APIC_EOI, 0x00);
  34         intr_irq_called = true;
  35 }
  36
  37 static void l2_guest_code(struct svm_test_data *svm)
  38 {
  39         /* This code raises interrupt INTR_IRQ_NUMBER in the L1's LAPIC,
  40          * and since L1 didn't enable virtual interrupt masking,
  41          * L2 should receive it and not L1.
  42          *
  43          * L2 also has virtual interrupt 'VINTR_IRQ_NUMBER' pending in V_IRQ
  44          * so it should also receive it after the following 'sti'.
  45          */
  46         x2apic_write_reg(APIC_ICR,
  47                 APIC_DEST_SELF | APIC_INT_ASSERT | INTR_IRQ_NUMBER);
  48
  49         __asm__ __volatile__(
  50                 "sti\n"
  51                 "nop\n"
  52         );
  53
  54         GUEST_ASSERT(vintr_irq_called);
  55         GUEST_ASSERT(intr_irq_called);
  56
  57         __asm__ __volatile__(
  58                 "vmcall\n"
  59         );
  60 }
  61
  62 static void l1_guest_code(struct svm_test_data *svm)
  63 {
  64         #define L2_GUEST_STACK_SIZE 64
  65         unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
  66         struct vmcb *vmcb = svm->vmcb;
  67
  68         x2apic_enable();
  69
  70         /* Prepare for L2 execution. */
  71         generic_svm_setup(svm, l2_guest_code,
  72                           &l2_guest_stack[L2_GUEST_STACK_SIZE]);
  73
  74         /* No virtual interrupt masking */
  75         vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK;
  76
  77         /* No intercepts for real and virtual interrupts */
  78         vmcb->control.intercept &= ~(1ULL << INTERCEPT_INTR | INTERCEPT_VINTR);
  79
  80         /* Make a virtual interrupt VINTR_IRQ_NUMBER pending */
  81         vmcb->control.int_ctl |= V_IRQ_MASK | (0x1 << V_INTR_PRIO_SHIFT);
  82         vmcb->control.int_vector = VINTR_IRQ_NUMBER;
  83
  84         run_guest(vmcb, svm->vmcb_gpa);
  85         GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL);
  86         GUEST_DONE();
  87 }
  88
  89 int main(int argc, char *argv[])
  90 {
  91         vm_vaddr_t svm_gva;
  92
  93         nested_svm_check_supported();
  94
  95         vm = vm_create_default(VCPU_ID, 0, (void *) l1_guest_code);
  96
  97         vm_init_descriptor_tables(vm);
  98         vcpu_init_descriptor_tables(vm, VCPU_ID);
  99
 100         vm_install_exception_handler(vm, VINTR_IRQ_NUMBER, vintr_irq_handler);
 101         vm_install_exception_handler(vm, INTR_IRQ_NUMBER, intr_irq_handler);
 102
 103         vcpu_alloc_svm(vm, &svm_gva);
 104         vcpu_args_set(vm, VCPU_ID, 1, svm_gva);
 105
 106         struct kvm_run *run = vcpu_state(vm, VCPU_ID);
 107         struct ucall uc;
 108
 109         vcpu_run(vm, VCPU_ID);
 110         TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
 111                     "Got exit_reason other than KVM_EXIT_IO: %u (%s)\n",
 112                     run->exit_reason,
 113                     exit_reason_str(run->exit_reason));
 114
 115         switch (get_ucall(vm, VCPU_ID, &uc)) {
 116         case UCALL_ABORT:
 117                 TEST_FAIL("%s", (const char *)uc.args[0]);
 118                 break;
 119                 /* NOT REACHED */
 120         case UCALL_DONE:
 121                 goto done;
 122         default:
 123                 TEST_FAIL("Unknown ucall 0x%lx.", uc.cmd);
 124         }
 125 done:
 126         kvm_vm_free(vm);
 127         return 0;
 128 }