1 // SPDX-License-Identifier: GPL-2.0-only
5 * Copyright (C) 2018, Red Hat, Inc.
7 * Tests for vCPU state save/restore, including nested guest state.
9 #define _GNU_SOURCE /* for program_invocation_short_name */
14 #include <sys/ioctl.h>
16 #include "test_util.h"
19 #include "processor.h"
24 #define L2_GUEST_STACK_SIZE 256
26 void svm_l2_guest_code(void)
32 /* Done, exit to L1 and never come back. */
36 static void svm_l1_guest_code(struct svm_test_data *svm)
38 unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
39 struct vmcb *vmcb = svm->vmcb;
41 GUEST_ASSERT(svm->vmcb_gpa);
42 /* Prepare for L2 execution. */
43 generic_svm_setup(svm, svm_l2_guest_code,
44 &l2_guest_stack[L2_GUEST_STACK_SIZE]);
47 run_guest(vmcb, svm->vmcb_gpa);
48 GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL);
51 run_guest(vmcb, svm->vmcb_gpa);
52 GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL);
56 void vmx_l2_guest_code(void)
63 /* L1 has now set up a shadow VMCS for us. */
64 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffee);
66 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffee);
67 GUEST_ASSERT(!vmwrite(GUEST_RIP, 0xc0fffee));
69 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0fffee);
70 GUEST_ASSERT(!vmwrite(GUEST_RIP, 0xc0ffffee));
73 /* Done, exit to L1 and never come back. */
77 static void vmx_l1_guest_code(struct vmx_pages *vmx_pages)
79 unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
81 GUEST_ASSERT(vmx_pages->vmcs_gpa);
82 GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages));
84 GUEST_ASSERT(load_vmcs(vmx_pages));
85 GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa);
88 GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa);
90 prepare_vmcs(vmx_pages, vmx_l2_guest_code,
91 &l2_guest_stack[L2_GUEST_STACK_SIZE]);
94 GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa);
95 GUEST_ASSERT(!vmlaunch());
96 GUEST_ASSERT(vmptrstz() == vmx_pages->vmcs_gpa);
97 GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
99 /* Check that the launched state is preserved. */
100 GUEST_ASSERT(vmlaunch());
102 GUEST_ASSERT(!vmresume());
103 GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
106 GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
108 GUEST_ASSERT(!vmresume());
109 GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
111 vmwrite(GUEST_RIP, vmreadz(GUEST_RIP) + 3);
113 vmwrite(SECONDARY_VM_EXEC_CONTROL, SECONDARY_EXEC_SHADOW_VMCS);
114 vmwrite(VMCS_LINK_POINTER, vmx_pages->shadow_vmcs_gpa);
116 GUEST_ASSERT(!vmptrld(vmx_pages->shadow_vmcs_gpa));
117 GUEST_ASSERT(vmlaunch());
119 GUEST_ASSERT(vmlaunch());
120 GUEST_ASSERT(vmresume());
122 vmwrite(GUEST_RIP, 0xc0ffee);
124 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffee);
126 GUEST_ASSERT(!vmptrld(vmx_pages->vmcs_gpa));
127 GUEST_ASSERT(!vmresume());
128 GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
130 GUEST_ASSERT(!vmptrld(vmx_pages->shadow_vmcs_gpa));
131 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffffee);
132 GUEST_ASSERT(vmlaunch());
133 GUEST_ASSERT(vmresume());
135 GUEST_ASSERT(vmreadz(GUEST_RIP) == 0xc0ffffee);
136 GUEST_ASSERT(vmlaunch());
137 GUEST_ASSERT(vmresume());
140 static void __attribute__((__flatten__)) guest_code(void *arg)
147 svm_l1_guest_code(arg);
149 vmx_l1_guest_code(arg);
155 int main(int argc, char *argv[])
157 vm_vaddr_t nested_gva = 0;
159 struct kvm_regs regs1, regs2;
162 struct kvm_x86_state *state;
167 vm = vm_create_default(VCPU_ID, 0, guest_code);
168 vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
169 run = vcpu_state(vm, VCPU_ID);
171 vcpu_regs_get(vm, VCPU_ID, ®s1);
173 if (kvm_check_cap(KVM_CAP_NESTED_STATE)) {
174 if (nested_svm_supported())
175 vcpu_alloc_svm(vm, &nested_gva);
176 else if (nested_vmx_supported())
177 vcpu_alloc_vmx(vm, &nested_gva);
181 pr_info("will skip nested state checks\n");
183 vcpu_args_set(vm, VCPU_ID, 1, nested_gva);
185 for (stage = 1;; stage++) {
186 _vcpu_run(vm, VCPU_ID);
187 TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
188 "Stage %d: unexpected exit reason: %u (%s),\n",
189 stage, run->exit_reason,
190 exit_reason_str(run->exit_reason));
192 switch (get_ucall(vm, VCPU_ID, &uc)) {
194 TEST_FAIL("%s at %s:%ld", (const char *)uc.args[0],
195 __FILE__, uc.args[1]);
202 TEST_FAIL("Unknown ucall %lu", uc.cmd);
205 /* UCALL_SYNC is handled here. */
206 TEST_ASSERT(!strcmp((const char *)uc.args[0], "hello") &&
207 uc.args[1] == stage, "Stage %d: Unexpected register values vmexit, got %lx",
208 stage, (ulong)uc.args[1]);
210 state = vcpu_save_state(vm, VCPU_ID);
211 memset(®s1, 0, sizeof(regs1));
212 vcpu_regs_get(vm, VCPU_ID, ®s1);
216 /* Restore state in a new VM. */
217 kvm_vm_restart(vm, O_RDWR);
218 vm_vcpu_add(vm, VCPU_ID);
219 vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
220 vcpu_load_state(vm, VCPU_ID, state);
221 run = vcpu_state(vm, VCPU_ID);
224 memset(®s2, 0, sizeof(regs2));
225 vcpu_regs_get(vm, VCPU_ID, ®s2);
226 TEST_ASSERT(!memcmp(®s1, ®s2, sizeof(regs2)),
227 "Unexpected register values after vcpu_load_state; rdi: %lx rsi: %lx",
228 (ulong) regs2.rdi, (ulong) regs2.rsi);