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Message-ID: <1152a5da-a573-6071-f171-d41e623fcef0@oracle.com>
Date: Mon, 21 Nov 2022 16:33:19 +0000
From: Liam Merwick <liam.merwick@...cle.com>
To: Maxim Levitsky <mlevitsk@...hat.com>, kvm@...r.kernel.org
Cc: Paolo Bonzini <pbonzini@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
linux-kernel@...r.kernel.org,
Chenyi Qiang <chenyi.qiang@...el.com>,
Yang Zhong <yang.zhong@...el.com>, x86@...nel.org,
Shuah Khan <shuah@...nel.org>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"H. Peter Anvin" <hpa@...or.com>,
Colton Lewis <coltonlewis@...gle.com>,
Borislav Petkov <bp@...en8.de>, Peter Xu <peterx@...hat.com>,
Sean Christopherson <seanjc@...gle.com>,
Jim Mattson <jmattson@...gle.com>,
linux-kselftest@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
Wei Wang <wei.w.wang@...el.com>,
David Matlack <dmatlack@...gle.com>
Subject: Re: [PATCH v2 6/9] kvm: selftests: add svm nested shutdown test
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@...hat.com>
Reviewed-by: Liam Merwick <liam.merwick@...cle.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);
>> +}
>
>
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