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kvm: selftests: add svm nested shutdown test
Add test that tests that on SVM if L1 doesn't intercept SHUTDOWN, then L2 crashes L1 and doesn't crash L2 Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com> Message-Id: <20221103141351.50662-7-mlevitsk@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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tools/testing/selftests/kvm/.gitignore
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tools/testing/selftests/kvm/.gitignore
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@ -41,6 +41,7 @@
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/x86_64/svm_vmcall_test
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/x86_64/svm_int_ctl_test
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/x86_64/svm_nested_soft_inject_test
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/x86_64/svm_nested_shutdown_test
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/x86_64/sync_regs_test
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/x86_64/tsc_msrs_test
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/x86_64/tsc_scaling_sync
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@ -101,6 +101,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/state_test
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TEST_GEN_PROGS_x86_64 += x86_64/vmx_preemption_timer_test
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TEST_GEN_PROGS_x86_64 += x86_64/svm_vmcall_test
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TEST_GEN_PROGS_x86_64 += x86_64/svm_int_ctl_test
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TEST_GEN_PROGS_x86_64 += x86_64/svm_nested_shutdown_test
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TEST_GEN_PROGS_x86_64 += x86_64/svm_nested_soft_inject_test
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TEST_GEN_PROGS_x86_64 += x86_64/tsc_scaling_sync
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TEST_GEN_PROGS_x86_64 += x86_64/sync_regs_test
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@ -0,0 +1,67 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* svm_nested_shutdown_test
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*
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* Copyright (C) 2022, Red Hat, Inc.
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*
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* Nested SVM testing: test that unintercepted shutdown in L2 doesn't crash the host
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*/
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#include "test_util.h"
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#include "kvm_util.h"
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#include "processor.h"
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#include "svm_util.h"
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static void l2_guest_code(struct svm_test_data *svm)
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{
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__asm__ __volatile__("ud2");
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}
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static void l1_guest_code(struct svm_test_data *svm, struct idt_entry *idt)
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{
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#define L2_GUEST_STACK_SIZE 64
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unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
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struct vmcb *vmcb = svm->vmcb;
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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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vmcb->control.intercept &= ~(BIT(INTERCEPT_SHUTDOWN));
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idt[6].p = 0; // #UD is intercepted but its injection will cause #NP
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idt[11].p = 0; // #NP is not intercepted and will cause another
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// #NP that will be converted to #DF
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idt[8].p = 0; // #DF will cause #NP which will cause SHUTDOWN
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run_guest(vmcb, svm->vmcb_gpa);
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/* should not reach here */
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GUEST_ASSERT(0);
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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_run *run;
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vm_vaddr_t svm_gva;
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struct kvm_vm *vm;
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TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM));
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vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code);
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vm_init_descriptor_tables(vm);
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vcpu_init_descriptor_tables(vcpu);
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vcpu_alloc_svm(vm, &svm_gva);
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vcpu_args_set(vcpu, 2, svm_gva, vm->idt);
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run = vcpu->run;
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vcpu_run(vcpu);
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TEST_ASSERT(run->exit_reason == KVM_EXIT_SHUTDOWN,
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"Got exit_reason other than KVM_EXIT_SHUTDOWN: %u (%s)\n",
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run->exit_reason,
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exit_reason_str(run->exit_reason));
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kvm_vm_free(vm);
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}
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