From 7edcb73433276d1b7bc82863df0aa9d229f5686c Mon Sep 17 00:00:00 2001 From: Vitaly Kuznetsov Date: Mon, 10 Dec 2018 18:21:59 +0100 Subject: KVM: selftests: Add hyperv_cpuid test 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 Signed-off-by: Paolo Bonzini --- tools/testing/selftests/kvm/Makefile | 1 + tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c | 157 ++++++++++++++++++++++ 2 files changed, 158 insertions(+) create mode 100644 tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c (limited to 'tools/testing/selftests/kvm') diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile index caaa0d5eba92..f9a0e9938480 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -15,6 +15,7 @@ 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_x86_64 += clear_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..264425f75806 --- /dev/null +++ b/tools/testing/selftests/kvm/x86_64/hyperv_cpuid.c @@ -0,0 +1,157 @@ +// 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 +#include +#include +#include +#include + +#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); + */ + } + +} + +void test_hv_cpuid_e2big(struct kvm_vm *vm) +{ + static struct kvm_cpuid2 cpuid = {.nent = 0}; + int ret; + + ret = _vcpu_ioctl(vm, VCPU_ID, KVM_GET_SUPPORTED_HV_CPUID, &cpuid); + + TEST_ASSERT(ret == -1 && errno == E2BIG, + "KVM_GET_SUPPORTED_HV_CPUID didn't fail with -E2BIG when" + " it should have: %d %d", ret, errno); +} + + +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); + + test_hv_cpuid_e2big(vm); + + 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; +} -- cgit v1.2.3-59-g8ed1b