[Patch v3 10/13] KVM: selftests: Test Hyper-V extended hypercall enablement

Vipin Sharma
2022-12-05T19:16:21Z

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;