KVM: selftests: Add hyperv_cpuid 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

// 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);

		 */

	}

}

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;

}