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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 <vkuznets@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Vitaly Kuznetsov
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Paolo Bonzini
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Dec 14, 2018
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// 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. | ||
* | ||
*/ | ||
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#define _GNU_SOURCE /* for program_invocation_short_name */ | ||
#include <fcntl.h> | ||
#include <stdio.h> | ||
#include <stdlib.h> | ||
#include <string.h> | ||
#include <sys/ioctl.h> | ||
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#include "test_util.h" | ||
#include "kvm_util.h" | ||
#include "processor.h" | ||
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#define VCPU_ID 0 | ||
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static void guest_code(void) | ||
{ | ||
} | ||
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static void test_hv_cpuid(struct kvm_cpuid2 *hv_cpuid_entries, | ||
int evmcs_enabled) | ||
{ | ||
int i; | ||
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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); | ||
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for (i = 0; i < hv_cpuid_entries->nent; i++) { | ||
struct kvm_cpuid_entry2 *entry = &hv_cpuid_entries->entries[i]; | ||
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TEST_ASSERT((entry->function >= 0x40000000) && | ||
(entry->function <= 0x4000000A), | ||
"function %lx is our of supported range", | ||
entry->function); | ||
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TEST_ASSERT(entry->index == 0, | ||
".index field should be zero"); | ||
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TEST_ASSERT(entry->index == 0, | ||
".index field should be zero"); | ||
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TEST_ASSERT(entry->flags == 0, | ||
".flags field should be zero"); | ||
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TEST_ASSERT(entry->padding[0] == entry->padding[1] | ||
== entry->padding[2] == 0, | ||
".index field should be zero"); | ||
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/* | ||
* 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); | ||
*/ | ||
} | ||
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} | ||
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void test_hv_cpuid_e2big(struct kvm_vm *vm) | ||
{ | ||
static struct kvm_cpuid2 cpuid = {.nent = 0}; | ||
int ret; | ||
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ret = _vcpu_ioctl(vm, VCPU_ID, KVM_GET_SUPPORTED_HV_CPUID, &cpuid); | ||
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TEST_ASSERT(ret == -1 && errno == E2BIG, | ||
"KVM_GET_SUPPORTED_HV_CPUID didn't fail with -E2BIG when" | ||
" it should have: %d %d", ret, errno); | ||
} | ||
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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; | ||
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cpuid = malloc(sizeof(*cpuid) + nent * sizeof(struct kvm_cpuid_entry2)); | ||
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if (!cpuid) { | ||
perror("malloc"); | ||
abort(); | ||
} | ||
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cpuid->nent = nent; | ||
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vcpu_ioctl(vm, VCPU_ID, KVM_GET_SUPPORTED_HV_CPUID, cpuid); | ||
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return cpuid; | ||
} | ||
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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 | ||
}; | ||
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/* Tell stdout not to buffer its content */ | ||
setbuf(stdout, NULL); | ||
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rv = kvm_check_cap(KVM_CAP_HYPERV_CPUID); | ||
if (!rv) { | ||
fprintf(stderr, | ||
"KVM_CAP_HYPERV_CPUID not supported, skip test\n"); | ||
exit(KSFT_SKIP); | ||
} | ||
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/* Create VM */ | ||
vm = vm_create_default(VCPU_ID, 0, guest_code); | ||
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test_hv_cpuid_e2big(vm); | ||
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hv_cpuid_entries = kvm_get_supported_hv_cpuid(vm); | ||
if (!hv_cpuid_entries) | ||
return 1; | ||
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test_hv_cpuid(hv_cpuid_entries, 0); | ||
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free(hv_cpuid_entries); | ||
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vcpu_ioctl(vm, VCPU_ID, KVM_ENABLE_CAP, &enable_evmcs_cap); | ||
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hv_cpuid_entries = kvm_get_supported_hv_cpuid(vm); | ||
if (!hv_cpuid_entries) | ||
return 1; | ||
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test_hv_cpuid(hv_cpuid_entries, 1); | ||
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free(hv_cpuid_entries); | ||
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kvm_vm_free(vm); | ||
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return 0; | ||
} |