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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>
Subject: [Patch v3 13/13] KVM: selftests: Test Hyper-V extended hypercall exit to userspace
Date: Mon,  5 Dec 2022 11:14:30 -0800	[thread overview]
Message-ID: <20221205191430.2455108-14-vipinsh@google.com> (raw)
In-Reply-To: <20221205191430.2455108-1-vipinsh@google.com>

Hyper-V extended hypercalls by default exit to userspace. Verify
userspace gets the call, update the result and then verify in guest
correct result is received.

Signed-off-by: Vipin Sharma <vipinsh@google.com>
---
 tools/testing/selftests/kvm/.gitignore        |  1 +
 tools/testing/selftests/kvm/Makefile          |  1 +
 .../kvm/x86_64/hyperv_extended_hypercalls.c   | 93 +++++++++++++++++++
 3 files changed, 95 insertions(+)
 create mode 100644 tools/testing/selftests/kvm/x86_64/hyperv_extended_hypercalls.c

diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
index 082855d94c72..b17874697d74 100644
--- a/tools/testing/selftests/kvm/.gitignore
+++ b/tools/testing/selftests/kvm/.gitignore
@@ -24,6 +24,7 @@
 /x86_64/hyperv_clock
 /x86_64/hyperv_cpuid
 /x86_64/hyperv_evmcs
+/x86_64/hyperv_extended_hypercalls
 /x86_64/hyperv_features
 /x86_64/hyperv_ipi
 /x86_64/hyperv_svm_test
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 2275ba861e0e..a0e12f5d9835 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -87,6 +87,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/fix_hypercall_test
 TEST_GEN_PROGS_x86_64 += x86_64/hyperv_clock
 TEST_GEN_PROGS_x86_64 += x86_64/hyperv_cpuid
 TEST_GEN_PROGS_x86_64 += x86_64/hyperv_evmcs
+TEST_GEN_PROGS_x86_64 += x86_64/hyperv_extended_hypercalls
 TEST_GEN_PROGS_x86_64 += x86_64/hyperv_features
 TEST_GEN_PROGS_x86_64 += x86_64/hyperv_ipi
 TEST_GEN_PROGS_x86_64 += x86_64/hyperv_svm_test
diff --git a/tools/testing/selftests/kvm/x86_64/hyperv_extended_hypercalls.c b/tools/testing/selftests/kvm/x86_64/hyperv_extended_hypercalls.c
new file mode 100644
index 000000000000..6635f5988d8d
--- /dev/null
+++ b/tools/testing/selftests/kvm/x86_64/hyperv_extended_hypercalls.c
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Test Hyper-V extended hypercall, HV_EXT_CALL_QUERY_CAPABILITIES (0x8001),
+ * exit to userspace and receive result in guest.
+ *
+ * Negative tests are present in hyperv_features.c
+ *
+ * Copyright 2022 Google LLC
+ * Author: Vipin Sharma <vipinsh@google.com>
+ */
+
+#include "kvm_util.h"
+#include "processor.h"
+#include "hyperv.h"
+
+/* Any value is fine */
+#define EXT_CAPABILITIES 0xbull
+
+static void guest_code(vm_vaddr_t in_pg_gpa, vm_vaddr_t out_pg_gpa,
+		       vm_vaddr_t out_pg_gva)
+{
+	uint64_t *output_gva;
+
+	wrmsr(HV_X64_MSR_GUEST_OS_ID, HYPERV_LINUX_OS_ID);
+	wrmsr(HV_X64_MSR_HYPERCALL, in_pg_gpa);
+
+	output_gva = (uint64_t *)out_pg_gva;
+
+	hyperv_hypercall(HV_EXT_CALL_QUERY_CAPABILITIES, in_pg_gpa, out_pg_gpa);
+
+	/* TLFS states output will be a uint64_t value */
+	GUEST_ASSERT_EQ(*output_gva, EXT_CAPABILITIES);
+
+	GUEST_DONE();
+}
+
+int main(void)
+{
+	vm_vaddr_t hcall_out_page;
+	vm_vaddr_t hcall_in_page;
+	struct kvm_vcpu *vcpu;
+	struct kvm_run *run;
+	struct kvm_vm *vm;
+	uint64_t *outval;
+	struct ucall uc;
+
+	/* Verify if extended hypercalls are supported */
+	if (!kvm_cpuid_has(kvm_get_supported_hv_cpuid(),
+			   HV_ENABLE_EXTENDED_HYPERCALLS)) {
+		print_skip("Extended calls not supported by the kernel");
+		exit(KSFT_SKIP);
+	}
+
+	vm = vm_create_with_one_vcpu(&vcpu, guest_code);
+	run = vcpu->run;
+	vcpu_set_hv_cpuid(vcpu);
+
+	/* Hypercall input */
+	hcall_in_page = vm_vaddr_alloc_pages(vm, 1);
+	memset(addr_gva2hva(vm, hcall_in_page), 0x0, vm->page_size);
+
+	/* Hypercall output */
+	hcall_out_page = vm_vaddr_alloc_pages(vm, 1);
+	memset(addr_gva2hva(vm, hcall_out_page), 0x0, vm->page_size);
+
+	vcpu_args_set(vcpu, 3, addr_gva2gpa(vm, hcall_in_page),
+		      addr_gva2gpa(vm, hcall_out_page), hcall_out_page);
+
+	vcpu_run(vcpu);
+
+	ASSERT_EXIT_REASON(vcpu, KVM_EXIT_HYPERV);
+
+	outval = addr_gpa2hva(vm, run->hyperv.u.hcall.params[1]);
+	*outval = EXT_CAPABILITIES;
+	run->hyperv.u.hcall.result = HV_STATUS_SUCCESS;
+
+	vcpu_run(vcpu);
+
+	ASSERT_EXIT_REASON(vcpu, KVM_EXIT_IO);
+
+	switch (get_ucall(vcpu, &uc)) {
+	case UCALL_ABORT:
+		REPORT_GUEST_ASSERT_2(uc, "arg1 = %ld, arg2 = %ld");
+		break;
+	case UCALL_DONE:
+		break;
+	default:
+		TEST_FAIL("Unhandled ucall: %ld", uc.cmd);
+	}
+
+	kvm_vm_free(vm);
+	return 0;
+}
-- 
2.39.0.rc0.267.gcb52ba06e7-goog


  parent reply	other threads:[~2022-12-05 19:16 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-12-05 19:14 [Patch v3 00/13] Add Hyper-v extended hypercall support in KVM Vipin Sharma
2022-12-05 19:14 ` [Patch v3 01/13] x86/hyperv: Add HV_EXPOSE_INVARIANT_TSC define Vipin Sharma
2022-12-05 19:14 ` [Patch v3 02/13] KVM: x86: Add a KVM-only leaf for CPUID_8000_0007_EDX Vipin Sharma
2022-12-05 19:14 ` [Patch v3 03/13] KVM: x86: Hyper-V invariant TSC control Vipin Sharma
2022-12-05 19:14 ` [Patch v3 04/13] KVM: selftests: Rename 'msr->available' to 'msr->fault_exepected' in hyperv_features test Vipin Sharma
2022-12-05 19:14 ` [Patch v3 05/13] KVM: selftests: Convert hyperv_features test to using KVM_X86_CPU_FEATURE() Vipin Sharma
2022-12-05 19:14 ` [Patch v3 06/13] KVM: selftests: Test that values written to Hyper-V MSRs are preserved Vipin Sharma
2022-12-05 19:14 ` [Patch v3 07/13] KVM: selftests: Test Hyper-V invariant TSC control Vipin Sharma
2022-12-05 19:14 ` [Patch v3 08/13] KVM: x86: hyper-v: Use common code for hypercall userspace exit Vipin Sharma
2022-12-05 19:14 ` [Patch v3 09/13] KVM: x86: hyper-v: Add extended hypercall support in Hyper-v Vipin Sharma
2022-12-05 19:14 ` [Patch v3 10/13] KVM: selftests: Test Hyper-V extended hypercall enablement Vipin Sharma
2022-12-05 19:14 ` [Patch v3 11/13] KVM: selftests: Replace hardcoded Linux OS id with HYPERV_LINUX_OS_ID Vipin Sharma
2022-12-05 19:14 ` [Patch v3 12/13] KVM: selftests: Make vCPU exit reason test assertion common Vipin Sharma
2022-12-09 21:50   ` David Matlack
2022-12-10  1:48     ` Sean Christopherson
2022-12-12 16:00       ` Vipin Sharma
2022-12-05 19:14 ` Vipin Sharma [this message]
2022-12-09 22:05   ` [Patch v3 13/13] KVM: selftests: Test Hyper-V extended hypercall exit to userspace David Matlack
2022-12-10  1:39     ` Sean Christopherson
2022-12-10 16:57       ` David Matlack

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