1 files changed, 84 insertions, 0 deletions
diff --git a/tools/testing/selftests/kvm/x86_64/vmx_msrs_test.c b/tools/testing/selftests/kvm/x86_64/vmx_msrs_test.c
new file mode 100644
index 000000000000..322d561b4260
--- /dev/null
+++ b/tools/testing/selftests/kvm/x86_64/vmx_msrs_test.c
@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * VMX control MSR test
+ *
+ * Copyright (C) 2022 Google LLC.
+ *
+ * Tests for KVM ownership of bits in the VMX entry/exit control MSRs. Checks
+ * that KVM will set owned bits where appropriate, and will not if
+ * KVM_X86_QUIRK_TWEAK_VMX_CTRL_MSRS is disabled.
+ */
+#include <linux/bitmap.h>
+#include "kvm_util.h"
+#include "vmx.h"
+
+static void vmx_fixed1_msr_test(struct kvm_vcpu *vcpu, uint32_t msr_index,
+				  uint64_t mask)
+{
+	uint64_t val = vcpu_get_msr(vcpu, msr_index);
+	uint64_t bit;
+
+	mask &= val;
+
+	for_each_set_bit(bit, &mask, 64) {
+		vcpu_set_msr(vcpu, msr_index, val & ~BIT_ULL(bit));
+		vcpu_set_msr(vcpu, msr_index, val);
+	}
+}
+
+static void vmx_fixed0_msr_test(struct kvm_vcpu *vcpu, uint32_t msr_index,
+				uint64_t mask)
+{
+	uint64_t val = vcpu_get_msr(vcpu, msr_index);
+	uint64_t bit;
+
+	mask = ~mask | val;
+
+	for_each_clear_bit(bit, &mask, 64) {
+		vcpu_set_msr(vcpu, msr_index, val | BIT_ULL(bit));
+		vcpu_set_msr(vcpu, msr_index, val);
+	}
+}
+
+static void vmx_fixed0and1_msr_test(struct kvm_vcpu *vcpu, uint32_t msr_index)
+{
+	vmx_fixed0_msr_test(vcpu, msr_index, GENMASK_ULL(31, 0));
+	vmx_fixed1_msr_test(vcpu, msr_index, GENMASK_ULL(63, 32));
+}
+
+static void vmx_save_restore_msrs_test(struct kvm_vcpu *vcpu)
+{
+	vcpu_set_msr(vcpu, MSR_IA32_VMX_VMCS_ENUM, 0);
+	vcpu_set_msr(vcpu, MSR_IA32_VMX_VMCS_ENUM, -1ull);
+
+	vmx_fixed1_msr_test(vcpu, MSR_IA32_VMX_BASIC,
+			    BIT_ULL(49) | BIT_ULL(54) | BIT_ULL(55));
+
+	vmx_fixed1_msr_test(vcpu, MSR_IA32_VMX_MISC,
+			    BIT_ULL(5) | GENMASK_ULL(8, 6) | BIT_ULL(14) |
+			    BIT_ULL(15) | BIT_ULL(28) | BIT_ULL(29) | BIT_ULL(30));
+
+	vmx_fixed0and1_msr_test(vcpu, MSR_IA32_VMX_PROCBASED_CTLS2);
+	vmx_fixed1_msr_test(vcpu, MSR_IA32_VMX_EPT_VPID_CAP, -1ull);
+	vmx_fixed0and1_msr_test(vcpu, MSR_IA32_VMX_TRUE_PINBASED_CTLS);
+	vmx_fixed0and1_msr_test(vcpu, MSR_IA32_VMX_TRUE_PROCBASED_CTLS);
+	vmx_fixed0and1_msr_test(vcpu, MSR_IA32_VMX_TRUE_EXIT_CTLS);
+	vmx_fixed0and1_msr_test(vcpu, MSR_IA32_VMX_TRUE_ENTRY_CTLS);
+	vmx_fixed1_msr_test(vcpu, MSR_IA32_VMX_VMFUNC, -1ull);
+}
+
+int main(void)
+{
+	struct kvm_vcpu *vcpu;
+	struct kvm_vm *vm;
+
+	TEST_REQUIRE(kvm_has_cap(KVM_CAP_DISABLE_QUIRKS2));
+	TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_VMX));
+
+	/* No need to actually do KVM_RUN, thus no guest code. */
+	vm = vm_create_with_one_vcpu(&vcpu, NULL);
+
+	vmx_save_restore_msrs_test(vcpu);
+
+	kvm_vm_free(vm);
+}