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From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: kvm@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>,
	Maxim Levitsky <mlevitsk@redhat.com>,
	Cathy Avery <cavery@redhat.com>,
	Emanuele Giuseppe Esposito <eesposit@redhat.com>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	Michael Roth <mdroth@linux.vnet.ibm.com>,
	linux-kernel@vger.kernel.org
Subject: [PATCH 6/6] KVM: selftests: smm_test: Test SMM enter from L2
Date: Mon, 28 Jun 2021 12:44:25 +0200	[thread overview]
Message-ID: <20210628104425.391276-7-vkuznets@redhat.com> (raw)
In-Reply-To: <20210628104425.391276-1-vkuznets@redhat.com>

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);
-- 
2.31.1


  parent reply	other threads:[~2021-06-28 10:45 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-28 10:44 [PATCH 0/6] KVM: nSVM: Fix issues when SMM is entered " Vitaly Kuznetsov
2021-06-28 10:44 ` [PATCH 1/6] KVM: nSVM: Check the value written to MSR_VM_HSAVE_PA Vitaly Kuznetsov
2021-07-07 10:28   ` Maxim Levitsky
2021-07-08 17:27     ` Paolo Bonzini
2021-07-09  6:08       ` Maxim Levitsky
2021-06-28 10:44 ` [PATCH 2/6] KVM: nSVM: Check that VM_HSAVE_PA MSR was set before VMRUN Vitaly Kuznetsov
2021-07-07 10:28   ` Maxim Levitsky
2021-06-28 10:44 ` [PATCH 3/6] KVM: nSVM: Introduce svm_copy_nonvmloadsave_state() Vitaly Kuznetsov
2021-07-05 12:08   ` Paolo Bonzini
2021-07-07 10:29     ` Maxim Levitsky
2021-06-28 10:44 ` [PATCH 4/6] KVM: nSVM: Fix L1 state corruption upon return from SMM Vitaly Kuznetsov
2021-07-07 10:32   ` Maxim Levitsky
2021-06-28 10:44 ` [PATCH 5/6] KVM: nSVM: Restore nested control upon leaving SMM Vitaly Kuznetsov
2021-07-07 10:35   ` Maxim Levitsky
2021-06-28 10:44 ` Vitaly Kuznetsov [this message]
2021-07-07 10:35   ` [PATCH 6/6] KVM: selftests: smm_test: Test SMM enter from L2 Maxim Levitsky
2021-07-08 17:40 ` [PATCH 0/6] KVM: nSVM: Fix issues when SMM is entered " Paolo Bonzini

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