From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: kvm@vger.kernel.org
Cc: "Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
linux-kernel@vger.kernel.org,
"Roman Kagan" <rkagan@virtuozzo.com>,
"K. Y. Srinivasan" <kys@microsoft.com>,
"Haiyang Zhang" <haiyangz@microsoft.com>,
"Stephen Hemminger" <sthemmin@microsoft.com>,
x86@kernel.org,
"Michael Kelley (EOSG)" <Michael.H.Kelley@microsoft.com>,
"Eduardo Habkost" <ehabkost@redhat.com>
Subject: [PATCH 6/6] KVM: selftests: Add hyperv_cpuid test
Date: Thu, 6 Dec 2018 17:58:25 +0100 [thread overview]
Message-ID: <20181206165825.1832-7-vkuznets@redhat.com> (raw)
In-Reply-To: <20181206165825.1832-1-vkuznets@redhat.com>
Add a simple (and stupid) hyperv_cpuid test: check that we got the
expected number of entries with and without Enlightened VMCS enabled
and that all currently reserved fields are zeroed.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
tools/testing/selftests/kvm/Makefile | 1 +
.../selftests/kvm/x86_64/hyperv_cpuid.c | 142 ++++++++++++++++++
2 files changed, 143 insertions(+)
create mode 100644 tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 01a219229238..a5f0f11f4381 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -14,6 +14,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/vmx_tsc_adjust_test
TEST_GEN_PROGS_x86_64 += x86_64/cr4_cpuid_sync_test
TEST_GEN_PROGS_x86_64 += x86_64/state_test
TEST_GEN_PROGS_x86_64 += x86_64/evmcs_test
+TEST_GEN_PROGS_x86_64 += x86_64/hyperv_cpuid
TEST_GEN_PROGS_x86_64 += dirty_log_test
TEST_GEN_PROGS_aarch64 += dirty_log_test
diff --git a/tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c b/tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c
new file mode 100644
index 000000000000..3a9e938f23ca
--- /dev/null
+++ b/tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Test for x86 KVM_CAP_HYPERV_CPUID
+ *
+ * Copyright (C) 2018, Red Hat, Inc.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ *
+ */
+
+#define _GNU_SOURCE /* for program_invocation_short_name */
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+
+#include "test_util.h"
+#include "kvm_util.h"
+#include "processor.h"
+
+#define VCPU_ID 0
+
+static void guest_code(void)
+{
+}
+
+static void test_hv_cpuid(struct kvm_cpuid2 *hv_cpuid_entries,
+ int evmcs_enabled)
+{
+ int i;
+
+ if (!evmcs_enabled)
+ TEST_ASSERT(hv_cpuid_entries->nent == 6,
+ "KVM_GET_SUPPORTED_HV_CPUID should return 6 entries"
+ " when Enlightened VMCS is disabled (returned %d)",
+ hv_cpuid_entries->nent);
+ else
+ TEST_ASSERT(hv_cpuid_entries->nent == 7,
+ "KVM_GET_SUPPORTED_HV_CPUID should return 7 entries"
+ " when Enlightened VMCS is enabled (returned %d)",
+ hv_cpuid_entries->nent);
+
+ for (i = 0; i < hv_cpuid_entries->nent; i++) {
+ struct kvm_cpuid_entry2 *entry = &hv_cpuid_entries->entries[i];
+
+ TEST_ASSERT((entry->function >= 0x40000000) &&
+ (entry->function <= 0x4000000A),
+ "function %lx is our of supported range",
+ entry->function);
+
+ TEST_ASSERT(entry->index == 0,
+ ".index field should be zero");
+
+ TEST_ASSERT(entry->index == 0,
+ ".index field should be zero");
+
+ TEST_ASSERT(entry->flags == 0,
+ ".flags field should be zero");
+
+ TEST_ASSERT(entry->padding[0] == entry->padding[1]
+ == entry->padding[2] == 0,
+ ".index field should be zero");
+
+ /*
+ * If needed for debug:
+ * fprintf(stdout,
+ * "CPUID%lx EAX=0x%lx EBX=0x%lx ECX=0x%lx EDX=0x%lx\n",
+ * entry->function, entry->eax, entry->ebx, entry->ecx,
+ * entry->edx);
+ */
+ }
+
+}
+
+struct kvm_cpuid2 *kvm_get_supported_hv_cpuid(struct kvm_vm *vm)
+{
+ int nent = 20; /* should be enough */
+ static struct kvm_cpuid2 *cpuid;
+ int ret;
+
+ cpuid = malloc(sizeof(*cpuid) + nent * sizeof(struct kvm_cpuid_entry2));
+
+ if (!cpuid) {
+ perror("malloc");
+ abort();
+ }
+
+ cpuid->nent = nent;
+
+ vcpu_ioctl(vm, VCPU_ID, KVM_GET_SUPPORTED_HV_CPUID, cpuid);
+
+ return cpuid;
+}
+
+
+int main(int argc, char *argv[])
+{
+ struct kvm_vm *vm;
+ int rv;
+ uint16_t evmcs_ver;
+ struct kvm_cpuid2 *hv_cpuid_entries;
+ struct kvm_enable_cap enable_evmcs_cap = {
+ .cap = KVM_CAP_HYPERV_ENLIGHTENED_VMCS,
+ .args[0] = (unsigned long)&evmcs_ver
+ };
+
+ /* Tell stdout not to buffer its content */
+ setbuf(stdout, NULL);
+
+ rv = kvm_check_cap(KVM_CAP_HYPERV_CPUID);
+ if (!rv) {
+ fprintf(stderr,
+ "KVM_CAP_HYPERV_CPUID not supported, skip test\n");
+ exit(KSFT_SKIP);
+ }
+
+ /* Create VM */
+ vm = vm_create_default(VCPU_ID, 0, guest_code);
+
+ hv_cpuid_entries = kvm_get_supported_hv_cpuid(vm);
+ if (!hv_cpuid_entries)
+ return 1;
+
+ test_hv_cpuid(hv_cpuid_entries, 0);
+
+ free(hv_cpuid_entries);
+
+ vcpu_ioctl(vm, VCPU_ID, KVM_ENABLE_CAP, &enable_evmcs_cap);
+
+ hv_cpuid_entries = kvm_get_supported_hv_cpuid(vm);
+ if (!hv_cpuid_entries)
+ return 1;
+
+ test_hv_cpuid(hv_cpuid_entries, 1);
+
+ free(hv_cpuid_entries);
+
+ kvm_vm_free(vm);
+
+ return 0;
+}
--
2.19.2
prev parent reply other threads:[~2018-12-06 16:58 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-06 16:58 [PATCH 0/6] x86/kvm/hyper-v: Implement KVM_GET_SUPPORTED_HV_CPUID Vitaly Kuznetsov
2018-12-06 16:58 ` [PATCH 1/6] x86/hyper-v: Do some housekeeping in hyperv-tlfs.h Vitaly Kuznetsov
2018-12-09 17:42 ` Michael Kelley
2018-12-06 16:58 ` [PATCH 2/6] x86/hyper-v: Drop HV_X64_CONFIGURE_PROFILER definition Vitaly Kuznetsov
2018-12-09 17:45 ` Michael Kelley
2018-12-06 16:58 ` [PATCH 3/6] x86/kvm/hyper-v: Introduce nested_get_evmcs_version() helper Vitaly Kuznetsov
2018-12-06 16:58 ` [PATCH 4/6] x86/kvm/hyper-v: Introduce KVM_GET_SUPPORTED_HV_CPUID Vitaly Kuznetsov
2018-12-09 22:54 ` Vitaly Kuznetsov
2018-12-06 16:58 ` [PATCH 5/6] x86/kvm/hyper-v: Drop KVM_CAP_HYPERV_STIMER_DIRECT Vitaly Kuznetsov
2018-12-06 16:58 ` Vitaly Kuznetsov [this message]
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