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selftests: kvm: add get_msr_index_features 

Test the KVM_GET_MSR_FEATURE_INDEX_LIST
and KVM_GET_MSR_INDEX_LIST ioctls.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Message-Id: <20210318145629.486450-1-eesposit@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Emanuele Giuseppe Esposito 2021-03-18 15:56:29 +01:00 committed by Paolo Bonzini
parent 2c7f76b4c4
commit 77a3aa26a0
5 changed files with 137 additions and 2 deletions
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1
tools/testing/selftests/kvm/.gitignore vendored
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@ -8,6 +8,7 @@
/x86_64/debug_regs
/x86_64/evmcs_test
/x86_64/get_cpuid_test
/x86_64/get_msr_index_features
/x86_64/kvm_pv_test
/x86_64/hyperv_clock
/x86_64/hyperv_cpuid

1
tools/testing/selftests/kvm/Makefile
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@ -39,6 +39,7 @@ LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c
LIBKVM_s390x = lib/s390x/processor.c lib/s390x/ucall.c lib/s390x/diag318_test_handler.c
TEST_GEN_PROGS_x86_64 = x86_64/cr4_cpuid_sync_test
TEST_GEN_PROGS_x86_64 += x86_64/get_msr_index_features
TEST_GEN_PROGS_x86_64 += x86_64/evmcs_test
TEST_GEN_PROGS_x86_64 += x86_64/get_cpuid_test
TEST_GEN_PROGS_x86_64 += x86_64/hyperv_clock

1
tools/testing/selftests/kvm/include/kvm_util.h
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@ -16,6 +16,7 @@
#include "sparsebit.h"
#define KVM_DEV_PATH "/dev/kvm"
#define KVM_MAX_VCPUS 512
/*

2
tools/testing/selftests/kvm/lib/kvm_util_internal.h
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@ -10,8 +10,6 @@
#include "sparsebit.h"
#define KVM_DEV_PATH "/dev/kvm"
struct userspace_mem_region {
struct kvm_userspace_memory_region region;
struct sparsebit *unused_phy_pages;

134
tools/testing/selftests/kvm/x86_64/get_msr_index_features.c Normal file
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@ -0,0 +1,134 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Test that KVM_GET_MSR_INDEX_LIST and
* KVM_GET_MSR_FEATURE_INDEX_LIST work as intended
*
* Copyright (C) 2020, Red Hat, Inc.
*/
#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"
static int kvm_num_index_msrs(int kvm_fd, int nmsrs)
{
struct kvm_msr_list *list;
int r;
list = malloc(sizeof(*list) + nmsrs * sizeof(list->indices[0]));
list->nmsrs = nmsrs;
r = ioctl(kvm_fd, KVM_GET_MSR_INDEX_LIST, list);
TEST_ASSERT(r == -1 && errno == E2BIG,
"Unexpected result from KVM_GET_MSR_INDEX_LIST probe, r: %i",
r);
r = list->nmsrs;
free(list);
return r;
}
static void test_get_msr_index(void)
{
int old_res, res, kvm_fd, r;
struct kvm_msr_list *list;
kvm_fd = open(KVM_DEV_PATH, O_RDONLY);
if (kvm_fd < 0)
exit(KSFT_SKIP);
old_res = kvm_num_index_msrs(kvm_fd, 0);
TEST_ASSERT(old_res != 0, "Expecting nmsrs to be > 0");
if (old_res != 1) {
res = kvm_num_index_msrs(kvm_fd, 1);
TEST_ASSERT(res > 1, "Expecting nmsrs to be > 1");
TEST_ASSERT(res == old_res, "Expecting nmsrs to be identical");
}
list = malloc(sizeof(*list) + old_res * sizeof(list->indices[0]));
list->nmsrs = old_res;
r = ioctl(kvm_fd, KVM_GET_MSR_INDEX_LIST, list);
TEST_ASSERT(r == 0,
"Unexpected result from KVM_GET_MSR_FEATURE_INDEX_LIST, r: %i",
r);
TEST_ASSERT(list->nmsrs == old_res, "Expecting nmsrs to be identical");
free(list);
close(kvm_fd);
}
static int kvm_num_feature_msrs(int kvm_fd, int nmsrs)
{
struct kvm_msr_list *list;
int r;
list = malloc(sizeof(*list) + nmsrs * sizeof(list->indices[0]));
list->nmsrs = nmsrs;
r = ioctl(kvm_fd, KVM_GET_MSR_FEATURE_INDEX_LIST, list);
TEST_ASSERT(r == -1 && errno == E2BIG,
"Unexpected result from KVM_GET_MSR_FEATURE_INDEX_LIST probe, r: %i",
r);
r = list->nmsrs;
free(list);
return r;
}
struct kvm_msr_list *kvm_get_msr_feature_list(int kvm_fd, int nmsrs)
{
struct kvm_msr_list *list;
int r;
list = malloc(sizeof(*list) + nmsrs * sizeof(list->indices[0]));
list->nmsrs = nmsrs;
r = ioctl(kvm_fd, KVM_GET_MSR_FEATURE_INDEX_LIST, list);
TEST_ASSERT(r == 0,
"Unexpected result from KVM_GET_MSR_FEATURE_INDEX_LIST, r: %i",
r);
return list;
}
static void test_get_msr_feature(void)
{
int res, old_res, i, kvm_fd;
struct kvm_msr_list *feature_list;
kvm_fd = open(KVM_DEV_PATH, O_RDONLY);
if (kvm_fd < 0)
exit(KSFT_SKIP);
old_res = kvm_num_feature_msrs(kvm_fd, 0);
TEST_ASSERT(old_res != 0, "Expecting nmsrs to be > 0");
if (old_res != 1) {
res = kvm_num_feature_msrs(kvm_fd, 1);
TEST_ASSERT(res > 1, "Expecting nmsrs to be > 1");
TEST_ASSERT(res == old_res, "Expecting nmsrs to be identical");
}
feature_list = kvm_get_msr_feature_list(kvm_fd, old_res);
TEST_ASSERT(old_res == feature_list->nmsrs,
"Unmatching number of msr indexes");
for (i = 0; i < feature_list->nmsrs; i++)
kvm_get_feature_msr(feature_list->indices[i]);
free(feature_list);
close(kvm_fd);
}
int main(int argc, char *argv[])
{
if (kvm_check_cap(KVM_CAP_GET_MSR_FEATURES))
test_get_msr_feature();
test_get_msr_index();
}