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

   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
  18static struct kvm_vm *vm;
  19
  20bool vintr_irq_called;
  21bool intr_irq_called;
  22
  23#define VINTR_IRQ_NUMBER 0x20
  24#define INTR_IRQ_NUMBER 0x30
  25
  26static void vintr_irq_handler(struct ex_regs *regs)
  27{
  28        vintr_irq_called = true;
  29}
  30
  31static void intr_irq_handler(struct ex_regs *regs)
  32{
  33        x2apic_write_reg(APIC_EOI, 0x00);
  34        intr_irq_called = true;
  35}
  36
  37static 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
  62static 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
  89int 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        }
 125done:
 126        kvm_vm_free(vm);
 127        return 0;
 128}
 129