Re: [PATCH] selftests/kvm: add get_msr_index_features

On 18/03/21 15:56, Emanuele Giuseppe Esposito wrote:

Test the KVM_GET_MSR_FEATURE_INDEX_LIST and KVM_GET_MSR_INDEX_LIST ioctls.

Signed-off-by: Emanuele Giuseppe Esposito eesposit@redhat.com

Looks good, thanks.

I queued it with a little extra code to verify KVM_GET_MSR_INDEX_LIST in the case that does not return E2BIG.

Paolo

---

tools/testing/selftests/kvm/.gitignore | 1 + tools/testing/selftests/kvm/Makefile | 1 + .../kvm/x86_64/get_msr_index_features.c | 124 ++++++++++++++++++ 3 files changed, 126 insertions(+) create mode 100644 tools/testing/selftests/kvm/x86_64/get_msr_index_features.c

diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore index 32b87cc77c8e..d99f3969d371 100644 --- a/tools/testing/selftests/kvm/.gitignore +++ b/tools/testing/selftests/kvm/.gitignore @@ -5,6 +5,7 @@ /s390x/resets /s390x/sync_regs_test /x86_64/cr4_cpuid_sync_test +/x86_64/get_msr_index_features /x86_64/debug_regs /x86_64/evmcs_test /x86_64/get_cpuid_test diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile index a6d61f451f88..c748b9650e28 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -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_cpuid diff --git a/tools/testing/selftests/kvm/x86_64/get_msr_index_features.c b/tools/testing/selftests/kvm/x86_64/get_msr_index_features.c new file mode 100644 index 000000000000..ad9972d99dfa --- /dev/null +++ b/tools/testing/selftests/kvm/x86_64/get_msr_index_features.c @@ -0,0 +1,124 @@ +// 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" +#include "../lib/kvm_util_internal.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;
• 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");
  

• }
• 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();

+}