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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * svm_int_ctl_test4 *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 16bool vintr_irq_called;17bool intr_irq_called;18 19#define VINTR_IRQ_NUMBER 0x2020#define INTR_IRQ_NUMBER 0x3021 22static void vintr_irq_handler(struct ex_regs *regs)23{24 vintr_irq_called = true;25}26 27static void intr_irq_handler(struct ex_regs *regs)28{29 x2apic_write_reg(APIC_EOI, 0x00);30 intr_irq_called = true;31}32 33static void l2_guest_code(struct svm_test_data *svm)34{35 /* This code raises interrupt INTR_IRQ_NUMBER in the L1's LAPIC,36 * and since L1 didn't enable virtual interrupt masking,37 * L2 should receive it and not L1.38 *39 * L2 also has virtual interrupt 'VINTR_IRQ_NUMBER' pending in V_IRQ40 * so it should also receive it after the following 'sti'.41 */42 x2apic_write_reg(APIC_ICR,43 APIC_DEST_SELF | APIC_INT_ASSERT | INTR_IRQ_NUMBER);44 45 __asm__ __volatile__(46 "sti\n"47 "nop\n"48 );49 50 GUEST_ASSERT(vintr_irq_called);51 GUEST_ASSERT(intr_irq_called);52 53 __asm__ __volatile__(54 "vmcall\n"55 );56}57 58static void l1_guest_code(struct svm_test_data *svm)59{60 #define L2_GUEST_STACK_SIZE 6461 unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];62 struct vmcb *vmcb = svm->vmcb;63 64 x2apic_enable();65 66 /* Prepare for L2 execution. */67 generic_svm_setup(svm, l2_guest_code,68 &l2_guest_stack[L2_GUEST_STACK_SIZE]);69 70 /* No virtual interrupt masking */71 vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK;72 73 /* No intercepts for real and virtual interrupts */74 vmcb->control.intercept &= ~(BIT(INTERCEPT_INTR) | BIT(INTERCEPT_VINTR));75 76 /* Make a virtual interrupt VINTR_IRQ_NUMBER pending */77 vmcb->control.int_ctl |= V_IRQ_MASK | (0x1 << V_INTR_PRIO_SHIFT);78 vmcb->control.int_vector = VINTR_IRQ_NUMBER;79 80 run_guest(vmcb, svm->vmcb_gpa);81 GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL);82 GUEST_DONE();83}84 85int main(int argc, char *argv[])86{87 struct kvm_vcpu *vcpu;88 vm_vaddr_t svm_gva;89 struct kvm_vm *vm;90 struct ucall uc;91 92 TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM));93 94 vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code);95 96 vm_install_exception_handler(vm, VINTR_IRQ_NUMBER, vintr_irq_handler);97 vm_install_exception_handler(vm, INTR_IRQ_NUMBER, intr_irq_handler);98 99 vcpu_alloc_svm(vm, &svm_gva);100 vcpu_args_set(vcpu, 1, svm_gva);101 102 vcpu_run(vcpu);103 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO);104 105 switch (get_ucall(vcpu, &uc)) {106 case UCALL_ABORT:107 REPORT_GUEST_ASSERT(uc);108 break;109 /* NOT REACHED */110 case UCALL_DONE:111 goto done;112 default:113 TEST_FAIL("Unknown ucall 0x%lx.", uc.cmd);114 }115done:116 kvm_vm_free(vm);117 return 0;118}119