On Thu, 2022-11-03 at 16:13 +0200, Maxim Levitsky wrote:
> Add test that tests that on SVM if L1 doesn't intercept SHUTDOWN,
> then L2 crashes L1 and doesn't crash L2
I mean doesn't crash L0, sorry for typo.
Best regards,
Maxim Levitsky
>
> Signed-off-by: Maxim Levitsky <mlevitsk@xxxxxxxxxx>
> ---
> tools/testing/selftests/kvm/.gitignore | 1 +
> tools/testing/selftests/kvm/Makefile | 1 +
> .../kvm/x86_64/svm_nested_shutdown_test.c | 67 +++++++++++++++++++
> 3 files changed, 69 insertions(+)
> create mode 100644 tools/testing/selftests/kvm/x86_64/svm_nested_shutdown_test.c
>
> diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
> index 2f0d705db9dba5..05d980fb083d17 100644
> --- a/tools/testing/selftests/kvm/.gitignore
> +++ b/tools/testing/selftests/kvm/.gitignore
> @@ -41,6 +41,7 @@
> /x86_64/svm_vmcall_test
> /x86_64/svm_int_ctl_test
> /x86_64/svm_nested_soft_inject_test
> +/x86_64/svm_nested_shutdown_test
> /x86_64/sync_regs_test
> /x86_64/tsc_msrs_test
> /x86_64/tsc_scaling_sync
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index 0172eb6cb6eee2..4a2caef2c9396f 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -101,6 +101,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/state_test
> TEST_GEN_PROGS_x86_64 += x86_64/vmx_preemption_timer_test
> TEST_GEN_PROGS_x86_64 += x86_64/svm_vmcall_test
> TEST_GEN_PROGS_x86_64 += x86_64/svm_int_ctl_test
> +TEST_GEN_PROGS_x86_64 += x86_64/svm_nested_shutdown_test
> TEST_GEN_PROGS_x86_64 += x86_64/svm_nested_soft_inject_test
> TEST_GEN_PROGS_x86_64 += x86_64/tsc_scaling_sync
> TEST_GEN_PROGS_x86_64 += x86_64/sync_regs_test
> diff --git a/tools/testing/selftests/kvm/x86_64/svm_nested_shutdown_test.c b/tools/testing/selftests/kvm/x86_64/svm_nested_shutdown_test.c
> new file mode 100644
> index 00000000000000..e73fcdef47bbe9
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/x86_64/svm_nested_shutdown_test.c
> @@ -0,0 +1,67 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * svm_nested_shutdown_test
> + *
> + * Copyright (C) 2022, Red Hat, Inc.
> + *
> + * Nested SVM testing: test that unintercepted shutdown in L2 doesn't crash the host
> + */
> +
> +#include "test_util.h"
> +#include "kvm_util.h"
> +#include "processor.h"
> +#include "svm_util.h"
> +
> +static void l2_guest_code(struct svm_test_data *svm)
> +{
> + __asm__ __volatile__("ud2");
> +}
> +
> +static void l1_guest_code(struct svm_test_data *svm, struct idt_entry *idt)
> +{
> + #define L2_GUEST_STACK_SIZE 64
> + unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
> + struct vmcb *vmcb = svm->vmcb;
> +
> + generic_svm_setup(svm, l2_guest_code,
> + &l2_guest_stack[L2_GUEST_STACK_SIZE]);
> +
> + vmcb->control.intercept &= ~(BIT(INTERCEPT_SHUTDOWN));
> +
> + idt[6].p = 0; // #UD is intercepted but its injection will cause #NP
> + idt[11].p = 0; // #NP is not intercepted and will cause another
> + // #NP that will be converted to #DF
> + idt[8].p = 0; // #DF will cause #NP which will cause SHUTDOWN
> +
> + run_guest(vmcb, svm->vmcb_gpa);
> +
> + /* should not reach here */
> + GUEST_ASSERT(0);
> +}
> +
> +int main(int argc, char *argv[])
> +{
> + struct kvm_vcpu *vcpu;
> + struct kvm_run *run;
> + vm_vaddr_t svm_gva;
> + struct kvm_vm *vm;
> +
> + TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM));
> +
> + vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code);
> + vm_init_descriptor_tables(vm);
> + vcpu_init_descriptor_tables(vcpu);
> +
> + vcpu_alloc_svm(vm, &svm_gva);
> +
> + vcpu_args_set(vcpu, 2, svm_gva, vm->idt);
> + run = vcpu->run;
> +
> + vcpu_run(vcpu);
> + TEST_ASSERT(run->exit_reason == KVM_EXIT_SHUTDOWN,
> + "Got exit_reason other than KVM_EXIT_SHUTDOWN: %u (%s)\n",
> + run->exit_reason,
> + exit_reason_str(run->exit_reason));
> +
> + kvm_vm_free(vm);
> +}
