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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (C) 2020, Google LLC.4 *5 * Test that KVM emulates instructions in response to EPT violations when6 * allow_smaller_maxphyaddr is enabled and guest.MAXPHYADDR < host.MAXPHYADDR.7 */8#include "flds_emulation.h"9 10#include "test_util.h"11#include "kvm_util.h"12#include "vmx.h"13 14#define MAXPHYADDR 3615 16#define MEM_REGION_GVA 0x000012345678900017#define MEM_REGION_GPA 0x000000070000000018#define MEM_REGION_SLOT 1019#define MEM_REGION_SIZE PAGE_SIZE20 21static void guest_code(bool tdp_enabled)22{23 uint64_t error_code;24 uint64_t vector;25 26 vector = kvm_asm_safe_ec(FLDS_MEM_EAX, error_code, "a"(MEM_REGION_GVA));27 28 /*29 * When TDP is enabled, flds will trigger an emulation failure, exit to30 * userspace, and then the selftest host "VMM" skips the instruction.31 *32 * When TDP is disabled, no instruction emulation is required so flds33 * should generate #PF(RSVD).34 */35 if (tdp_enabled) {36 GUEST_ASSERT(!vector);37 } else {38 GUEST_ASSERT_EQ(vector, PF_VECTOR);39 GUEST_ASSERT(error_code & PFERR_RSVD_MASK);40 }41 42 GUEST_DONE();43}44 45int main(int argc, char *argv[])46{47 struct kvm_vcpu *vcpu;48 struct kvm_vm *vm;49 struct ucall uc;50 uint64_t *pte;51 uint64_t *hva;52 uint64_t gpa;53 int rc;54 55 TEST_REQUIRE(kvm_has_cap(KVM_CAP_SMALLER_MAXPHYADDR));56 57 vm = vm_create_with_one_vcpu(&vcpu, guest_code);58 vcpu_args_set(vcpu, 1, kvm_is_tdp_enabled());59 60 vcpu_set_cpuid_property(vcpu, X86_PROPERTY_MAX_PHY_ADDR, MAXPHYADDR);61 62 rc = kvm_check_cap(KVM_CAP_EXIT_ON_EMULATION_FAILURE);63 TEST_ASSERT(rc, "KVM_CAP_EXIT_ON_EMULATION_FAILURE is unavailable");64 vm_enable_cap(vm, KVM_CAP_EXIT_ON_EMULATION_FAILURE, 1);65 66 vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS,67 MEM_REGION_GPA, MEM_REGION_SLOT,68 MEM_REGION_SIZE / PAGE_SIZE, 0);69 gpa = vm_phy_pages_alloc(vm, MEM_REGION_SIZE / PAGE_SIZE,70 MEM_REGION_GPA, MEM_REGION_SLOT);71 TEST_ASSERT(gpa == MEM_REGION_GPA, "Failed vm_phy_pages_alloc");72 virt_map(vm, MEM_REGION_GVA, MEM_REGION_GPA, 1);73 hva = addr_gpa2hva(vm, MEM_REGION_GPA);74 memset(hva, 0, PAGE_SIZE);75 76 pte = vm_get_page_table_entry(vm, MEM_REGION_GVA);77 *pte |= BIT_ULL(MAXPHYADDR);78 79 vcpu_run(vcpu);80 81 /*82 * When TDP is enabled, KVM must emulate in response the guest physical83 * address that is illegal from the guest's perspective, but is legal84 * from hardware's perspeective. This should result in an emulation85 * failure exit to userspace since KVM doesn't support emulating flds.86 */87 if (kvm_is_tdp_enabled()) {88 handle_flds_emulation_failure_exit(vcpu);89 vcpu_run(vcpu);90 }91 92 switch (get_ucall(vcpu, &uc)) {93 case UCALL_ABORT:94 REPORT_GUEST_ASSERT(uc);95 break;96 case UCALL_DONE:97 break;98 default:99 TEST_FAIL("Unrecognized ucall: %lu", uc.cmd);100 }101 102 kvm_vm_free(vm);103 104 return 0;105}106