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SubjectRe: [PATCH 6/6] KVM: selftests: smm_test: Test SMM enter from L2
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On Mon, 2021-06-28 at 12:44 +0200, Vitaly Kuznetsov wrote:
> Two additional tests are added:
> - SMM triggered from L2 does not currupt L1 host state.
> - Save/restore during SMM triggered from L2 does not corrupt guest/host
> state.
>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
> ---
> tools/testing/selftests/kvm/x86_64/smm_test.c | 70 +++++++++++++++++--
> 1 file changed, 64 insertions(+), 6 deletions(-)
>
> diff --git a/tools/testing/selftests/kvm/x86_64/smm_test.c b/tools/testing/selftests/kvm/x86_64/smm_test.c
> index c1f831803ad2..d0fe2fdce58c 100644
> --- a/tools/testing/selftests/kvm/x86_64/smm_test.c
> +++ b/tools/testing/selftests/kvm/x86_64/smm_test.c
> @@ -53,15 +53,28 @@ static inline void sync_with_host(uint64_t phase)
> : "+a" (phase));
> }
>
> -void self_smi(void)
> +static void self_smi(void)
> {
> x2apic_write_reg(APIC_ICR,
> APIC_DEST_SELF | APIC_INT_ASSERT | APIC_DM_SMI);
> }
>
> -void guest_code(void *arg)
> +static void l2_guest_code(void)
> {
> + sync_with_host(8);
> +
> + sync_with_host(10);
> +
> + vmcall();
> +}
> +
> +static void guest_code(void *arg)
> +{
> + #define L2_GUEST_STACK_SIZE 64
> + unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
> uint64_t apicbase = rdmsr(MSR_IA32_APICBASE);
> + struct svm_test_data *svm = arg;
> + struct vmx_pages *vmx_pages = arg;
>
> sync_with_host(1);
>
> @@ -74,21 +87,50 @@ void guest_code(void *arg)
> sync_with_host(4);
>
> if (arg) {
> - if (cpu_has_svm())
> - generic_svm_setup(arg, NULL, NULL);
> - else
> - GUEST_ASSERT(prepare_for_vmx_operation(arg));
> + if (cpu_has_svm()) {
> + generic_svm_setup(svm, l2_guest_code,
> + &l2_guest_stack[L2_GUEST_STACK_SIZE]);
> + } else {
> + GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages));
> + GUEST_ASSERT(load_vmcs(vmx_pages));
> + prepare_vmcs(vmx_pages, l2_guest_code,
> + &l2_guest_stack[L2_GUEST_STACK_SIZE]);
> + }
>
> sync_with_host(5);
>
> self_smi();
>
> sync_with_host(7);
> +
> + if (cpu_has_svm()) {
> + run_guest(svm->vmcb, svm->vmcb_gpa);
> + svm->vmcb->save.rip += 3;
> + run_guest(svm->vmcb, svm->vmcb_gpa);
> + } else {
> + vmlaunch();
> + vmresume();
> + }
> +
> + /* Stages 8-11 are eaten by SMM (SMRAM_STAGE reported instead) */
> + sync_with_host(12);
> }
>
> sync_with_host(DONE);
> }
>
> +void inject_smi(struct kvm_vm *vm)
> +{
> + struct kvm_vcpu_events events;
> +
> + vcpu_events_get(vm, VCPU_ID, &events);
> +
> + events.smi.pending = 1;
> + events.flags |= KVM_VCPUEVENT_VALID_SMM;
> +
> + vcpu_events_set(vm, VCPU_ID, &events);
> +}
> +
> int main(int argc, char *argv[])
> {
> vm_vaddr_t nested_gva = 0;
> @@ -147,6 +189,22 @@ int main(int argc, char *argv[])
> "Unexpected stage: #%x, got %x",
> stage, stage_reported);
>
> + /*
> + * Enter SMM during L2 execution and check that we correctly
> + * return from it. Do not perform save/restore while in SMM yet.
> + */
> + if (stage == 8) {
> + inject_smi(vm);
> + continue;
> + }
> +
> + /*
> + * Perform save/restore while the guest is in SMM triggered
> + * during L2 execution.
> + */
> + if (stage == 10)
> + inject_smi(vm);
> +
> state = vcpu_save_state(vm, VCPU_ID);
> kvm_vm_release(vm);
> kvm_vm_restart(vm, O_RDWR);

Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>

Best regards,
Maxim Levitsky

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