1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2018, Red Hat, Inc. 4 * 5 * Tests for SMM. 6 */ 7 #define _GNU_SOURCE /* for program_invocation_short_name */ 8 #include <fcntl.h> 9 #include <stdio.h> 10 #include <stdlib.h> 11 #include <stdint.h> 12 #include <string.h> 13 #include <sys/ioctl.h> 14 15 #include "test_util.h" 16 17 #include "kvm_util.h" 18 19 #include "vmx.h" 20 #include "svm_util.h" 21 22 #define VCPU_ID 1 23 24 #define PAGE_SIZE 4096 25 26 #define SMRAM_SIZE 65536 27 #define SMRAM_MEMSLOT ((1 << 16) | 1) 28 #define SMRAM_PAGES (SMRAM_SIZE / PAGE_SIZE) 29 #define SMRAM_GPA 0x1000000 30 #define SMRAM_STAGE 0xfe 31 32 #define STR(x) #x 33 #define XSTR(s) STR(s) 34 35 #define SYNC_PORT 0xe 36 #define DONE 0xff 37 38 /* 39 * This is compiled as normal 64-bit code, however, SMI handler is executed 40 * in real-address mode. To stay simple we're limiting ourselves to a mode 41 * independent subset of asm here. 42 * SMI handler always report back fixed stage SMRAM_STAGE. 43 */ 44 uint8_t smi_handler[] = { 45 0xb0, SMRAM_STAGE, /* mov $SMRAM_STAGE, %al */ 46 0xe4, SYNC_PORT, /* in $SYNC_PORT, %al */ 47 0x0f, 0xaa, /* rsm */ 48 }; 49 50 static inline void sync_with_host(uint64_t phase) 51 { 52 asm volatile("in $" XSTR(SYNC_PORT)", %%al \n" 53 : "+a" (phase)); 54 } 55 56 void self_smi(void) 57 { 58 wrmsr(APIC_BASE_MSR + (APIC_ICR >> 4), 59 APIC_DEST_SELF | APIC_INT_ASSERT | APIC_DM_SMI); 60 } 61 62 void guest_code(void *arg) 63 { 64 uint64_t apicbase = rdmsr(MSR_IA32_APICBASE); 65 66 sync_with_host(1); 67 68 wrmsr(MSR_IA32_APICBASE, apicbase | X2APIC_ENABLE); 69 70 sync_with_host(2); 71 72 self_smi(); 73 74 sync_with_host(4); 75 76 if (arg) { 77 if (cpu_has_svm()) 78 generic_svm_setup(arg, NULL, NULL); 79 else 80 GUEST_ASSERT(prepare_for_vmx_operation(arg)); 81 82 sync_with_host(5); 83 84 self_smi(); 85 86 sync_with_host(7); 87 } 88 89 sync_with_host(DONE); 90 } 91 92 int main(int argc, char *argv[]) 93 { 94 vm_vaddr_t nested_gva = 0; 95 96 struct kvm_regs regs; 97 struct kvm_vm *vm; 98 struct kvm_run *run; 99 struct kvm_x86_state *state; 100 int stage, stage_reported; 101 102 /* Create VM */ 103 vm = vm_create_default(VCPU_ID, 0, guest_code); 104 105 run = vcpu_state(vm, VCPU_ID); 106 107 vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, SMRAM_GPA, 108 SMRAM_MEMSLOT, SMRAM_PAGES, 0); 109 TEST_ASSERT(vm_phy_pages_alloc(vm, SMRAM_PAGES, SMRAM_GPA, SMRAM_MEMSLOT) 110 == SMRAM_GPA, "could not allocate guest physical addresses?"); 111 112 memset(addr_gpa2hva(vm, SMRAM_GPA), 0x0, SMRAM_SIZE); 113 memcpy(addr_gpa2hva(vm, SMRAM_GPA) + 0x8000, smi_handler, 114 sizeof(smi_handler)); 115 116 vcpu_set_msr(vm, VCPU_ID, MSR_IA32_SMBASE, SMRAM_GPA); 117 118 if (kvm_check_cap(KVM_CAP_NESTED_STATE)) { 119 if (nested_svm_supported()) 120 vcpu_alloc_svm(vm, &nested_gva); 121 else if (nested_vmx_supported()) 122 vcpu_alloc_vmx(vm, &nested_gva); 123 } 124 125 if (!nested_gva) 126 pr_info("will skip SMM test with VMX enabled\n"); 127 128 vcpu_args_set(vm, VCPU_ID, 1, nested_gva); 129 130 for (stage = 1;; stage++) { 131 _vcpu_run(vm, VCPU_ID); 132 TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, 133 "Stage %d: unexpected exit reason: %u (%s),\n", 134 stage, run->exit_reason, 135 exit_reason_str(run->exit_reason)); 136 137 memset(®s, 0, sizeof(regs)); 138 vcpu_regs_get(vm, VCPU_ID, ®s); 139 140 stage_reported = regs.rax & 0xff; 141 142 if (stage_reported == DONE) 143 goto done; 144 145 TEST_ASSERT(stage_reported == stage || 146 stage_reported == SMRAM_STAGE, 147 "Unexpected stage: #%x, got %x", 148 stage, stage_reported); 149 150 state = vcpu_save_state(vm, VCPU_ID); 151 kvm_vm_release(vm); 152 kvm_vm_restart(vm, O_RDWR); 153 vm_vcpu_add(vm, VCPU_ID); 154 vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid()); 155 vcpu_load_state(vm, VCPU_ID, state); 156 run = vcpu_state(vm, VCPU_ID); 157 free(state); 158 } 159 160 done: 161 kvm_vm_free(vm); 162 } 163