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91423b041d
Add SVM L1 code to run the nested guest, and allow the test to run with SVM as well as VMX. Signed-off-by: Yosry Ahmed <yosry.ahmed@linux.dev> Link: https://patch.msgid.link/20251021074736.1324328-7-yosry.ahmed@linux.dev Signed-off-by: Sean Christopherson <seanjc@google.com>
117 lines
2.6 KiB
C
117 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2025, Google LLC.
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*
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* This test verifies that L1 fails to enter L2 with an invalid CR3, and
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* succeeds otherwise.
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*/
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#include "kvm_util.h"
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#include "vmx.h"
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#include "svm_util.h"
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#include "kselftest.h"
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#define L2_GUEST_STACK_SIZE 64
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static void l2_guest_code(void)
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{
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vmcall();
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}
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static void l1_svm_code(struct svm_test_data *svm)
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{
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unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
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uintptr_t save_cr3;
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generic_svm_setup(svm, l2_guest_code,
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&l2_guest_stack[L2_GUEST_STACK_SIZE]);
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/* Try to run L2 with invalid CR3 and make sure it fails */
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save_cr3 = svm->vmcb->save.cr3;
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svm->vmcb->save.cr3 = -1ull;
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run_guest(svm->vmcb, svm->vmcb_gpa);
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GUEST_ASSERT(svm->vmcb->control.exit_code == SVM_EXIT_ERR);
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/* Now restore CR3 and make sure L2 runs successfully */
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svm->vmcb->save.cr3 = save_cr3;
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run_guest(svm->vmcb, svm->vmcb_gpa);
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GUEST_ASSERT(svm->vmcb->control.exit_code == SVM_EXIT_VMMCALL);
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GUEST_DONE();
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}
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static void l1_vmx_code(struct vmx_pages *vmx_pages)
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{
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unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
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uintptr_t save_cr3;
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GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages));
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GUEST_ASSERT(load_vmcs(vmx_pages));
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prepare_vmcs(vmx_pages, l2_guest_code,
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&l2_guest_stack[L2_GUEST_STACK_SIZE]);
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/* Try to run L2 with invalid CR3 and make sure it fails */
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save_cr3 = vmreadz(GUEST_CR3);
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vmwrite(GUEST_CR3, -1ull);
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GUEST_ASSERT(!vmlaunch());
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GUEST_ASSERT(vmreadz(VM_EXIT_REASON) ==
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(EXIT_REASON_FAILED_VMENTRY | EXIT_REASON_INVALID_STATE));
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/* Now restore CR3 and make sure L2 runs successfully */
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vmwrite(GUEST_CR3, save_cr3);
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GUEST_ASSERT(!vmlaunch());
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GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
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GUEST_DONE();
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}
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static void l1_guest_code(void *data)
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{
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if (this_cpu_has(X86_FEATURE_VMX))
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l1_vmx_code(data);
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else
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l1_svm_code(data);
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}
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int main(int argc, char *argv[])
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{
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struct kvm_vcpu *vcpu;
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struct kvm_vm *vm;
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vm_vaddr_t guest_gva = 0;
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TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_VMX) ||
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kvm_cpu_has(X86_FEATURE_SVM));
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vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code);
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if (kvm_cpu_has(X86_FEATURE_VMX))
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vcpu_alloc_vmx(vm, &guest_gva);
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else
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vcpu_alloc_svm(vm, &guest_gva);
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vcpu_args_set(vcpu, 1, guest_gva);
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for (;;) {
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struct ucall uc;
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vcpu_run(vcpu);
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TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO);
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switch (get_ucall(vcpu, &uc)) {
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case UCALL_ABORT:
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REPORT_GUEST_ASSERT(uc);
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case UCALL_SYNC:
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break;
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case UCALL_DONE:
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goto done;
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default:
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TEST_FAIL("Unknown ucall %lu", uc.cmd);
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}
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}
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done:
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kvm_vm_free(vm);
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return 0;
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}
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