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Date:   Mon, 12 Dec 2022 10:37:17 -0800
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Subject: [Patch v4 10/13] KVM: selftests: Test Hyper-V extended hypercall enablement
From:   Vipin Sharma <vipinsh@google.com>
To:     seanjc@google.com, pbonzini@redhat.com, vkuznets@redhat.com,
        dmatlack@google.com
Cc:     kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
        Vipin Sharma <vipinsh@google.com>
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Test Hyper-V extended hypercall, HV_EXT_CALL_QUERY_CAPABILITIES
(0x8001), access denied and invalid parameter
cases.

Access is denied if CPUID.0x40000003.EBX BIT(20) is not set.
Invalid parameter if call has fast bit set.

Signed-off-by: Vipin Sharma <vipinsh@google.com>
---
 tools/testing/selftests/kvm/include/x86_64/hyperv.h  | 5 +++++
 tools/testing/selftests/kvm/x86_64/hyperv_features.c | 9 +++++++++
 2 files changed, 14 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/x86_64/hyperv.h b/tools/testing/selftests/kvm/include/x86_64/hyperv.h
index 28eb99046475..fa65b908b13e 100644
--- a/tools/testing/selftests/kvm/include/x86_64/hyperv.h
+++ b/tools/testing/selftests/kvm/include/x86_64/hyperv.h
@@ -137,6 +137,8 @@
 	KVM_X86_CPU_FEATURE(HYPERV_CPUID_FEATURES, 0, EBX, 11)
 #define HV_CPU_MANAGEMENT			\
 	KVM_X86_CPU_FEATURE(HYPERV_CPUID_FEATURES, 0, EBX, 12)
+#define HV_ENABLE_EXTENDED_HYPERCALLS		\
+	KVM_X86_CPU_FEATURE(HYPERV_CPUID_FEATURES, 0, EBX, 20)
 #define HV_ISOLATION				\
 	KVM_X86_CPU_FEATURE(HYPERV_CPUID_FEATURES, 0, EBX, 22)
 
@@ -213,6 +215,9 @@
 #define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE 0x00af
 #define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_LIST 0x00b0
 
+/* Extended hypercalls */
+#define HV_EXT_CALL_QUERY_CAPABILITIES		0x8001
+
 #define HV_FLUSH_ALL_PROCESSORS			BIT(0)
 #define HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES	BIT(1)
 #define HV_FLUSH_NON_GLOBAL_MAPPINGS_ONLY	BIT(2)
diff --git a/tools/testing/selftests/kvm/x86_64/hyperv_features.c b/tools/testing/selftests/kvm/x86_64/hyperv_features.c
index 258267df8e2a..c5e3b39edd07 100644
--- a/tools/testing/selftests/kvm/x86_64/hyperv_features.c
+++ b/tools/testing/selftests/kvm/x86_64/hyperv_features.c
@@ -649,6 +649,15 @@ static void guest_test_hcalls_access(void)
 			hcall->expect = HV_STATUS_SUCCESS;
 			break;
 		case 19:
+			hcall->control = HV_EXT_CALL_QUERY_CAPABILITIES;
+			hcall->expect = HV_STATUS_ACCESS_DENIED;
+			break;
+		case 20:
+			vcpu_set_cpuid_feature(vcpu, HV_ENABLE_EXTENDED_HYPERCALLS);
+			hcall->control = HV_EXT_CALL_QUERY_CAPABILITIES | HV_HYPERCALL_FAST_BIT;
+			hcall->expect = HV_STATUS_INVALID_PARAMETER;
+			break;
+		case 21:
 			kvm_vm_free(vm);
 			return;
 		}
-- 
2.39.0.rc1.256.g54fd8350bd-goog