[v2,6/9] kvm: selftests: add svm nested shutdown test
Commit Message
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>
---
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
Comments
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@redhat.com>
> ---
> 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);
> +}
On 03/11/2022 14:28, Maxim Levitsky wrote:
> 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@redhat.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
>> ---
>> 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);
>> +}
>
>
@@ -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
@@ -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
new file mode 100644
@@ -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);
+}