linux-kernel - [PATCH 3/6] KVM: selftests: Test Hyper-V extended hypercall enablement

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Message-ID: <20221105045704.2315186-4-vipinsh@google.com>
Date:   Fri,  4 Nov 2022 21:57:01 -0700
From:   Vipin Sharma <vipinsh@...gle.com>
To:     seanjc@...gle.com, pbonzini@...hat.com, vkuznets@...hat.com
Cc:     dmatlack@...gle.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Vipin Sharma <vipinsh@...gle.com>
Subject: [PATCH 3/6] KVM: selftests: Test Hyper-V extended hypercall enablement

Test Extended hypercall CPUID enablement

Signed-off-by: Vipin Sharma <vipinsh@...gle.com>
---
 tools/testing/selftests/kvm/include/x86_64/hyperv.h  | 4 ++++
 tools/testing/selftests/kvm/x86_64/hyperv_features.c | 9 +++++++++
 2 files changed, 13 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/x86_64/hyperv.h b/tools/testing/selftests/kvm/include/x86_64/hyperv.h
index b66910702c0a..075fd29071a6 100644
--- a/tools/testing/selftests/kvm/include/x86_64/hyperv.h
+++ b/tools/testing/selftests/kvm/include/x86_64/hyperv.h
@@ -110,6 +110,7 @@
 #define HV_ACCESS_STATS				BIT(8)
 #define HV_DEBUGGING				BIT(11)
 #define HV_CPU_MANAGEMENT			BIT(12)
+#define HV_ENABLE_EXTENDED_HYPERCALLS		BIT(20)
 #define HV_ISOLATION				BIT(22)
 
 /* HYPERV_CPUID_FEATURES.EDX */
@@ -164,6 +165,9 @@
 #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 05b32e550a80..6b443ce456b6 100644
--- a/tools/testing/selftests/kvm/x86_64/hyperv_features.c
+++ b/tools/testing/selftests/kvm/x86_64/hyperv_features.c
@@ -602,6 +602,15 @@ 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:
+			feat->ebx |= 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;
 		}
-- 
2.38.1.273.g43a17bfeac-goog