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Message-Id: <20220330174621.1567317-3-bgardon@google.com>
Date: Wed, 30 Mar 2022 10:46:12 -0700
From: Ben Gardon <bgardon@...gle.com>
To: linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc: Paolo Bonzini <pbonzini@...hat.com>, Peter Xu <peterx@...hat.com>,
Sean Christopherson <seanjc@...gle.com>,
David Matlack <dmatlack@...gle.com>,
Jim Mattson <jmattson@...gle.com>,
David Dunn <daviddunn@...gle.com>,
Jing Zhang <jingzhangos@...gle.com>,
Junaid Shahid <junaids@...gle.com>,
Ben Gardon <bgardon@...gle.com>
Subject: [PATCH v3 02/11] KVM: selftests: Dump VM stats in binary stats test
Add kvm_util library functions to read KVM stats through the binary
stats interface and then dump them to stdout when running the binary
stats test. Subsequent commits will extend the kvm_util code and use it
to make assertions in a test for NX hugepages.
CC: Jing Zhang <jingzhangos@...gle.com>
Signed-off-by: Ben Gardon <bgardon@...gle.com>
---
.../selftests/kvm/include/kvm_util_base.h | 1 +
.../selftests/kvm/kvm_binary_stats_test.c | 3 +
tools/testing/selftests/kvm/lib/kvm_util.c | 143 ++++++++++++++++++
3 files changed, 147 insertions(+)
diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
index 976aaaba8769..4783fd1cd4cf 100644
--- a/tools/testing/selftests/kvm/include/kvm_util_base.h
+++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
@@ -401,6 +401,7 @@ void assert_on_unhandled_exception(struct kvm_vm *vm, uint32_t vcpuid);
int vm_get_stats_fd(struct kvm_vm *vm);
int vcpu_get_stats_fd(struct kvm_vm *vm, uint32_t vcpuid);
+void dump_vm_stats(struct kvm_vm *vm);
uint32_t guest_get_vcpuid(void);
diff --git a/tools/testing/selftests/kvm/kvm_binary_stats_test.c b/tools/testing/selftests/kvm/kvm_binary_stats_test.c
index 17f65d514915..afc4701ce8dd 100644
--- a/tools/testing/selftests/kvm/kvm_binary_stats_test.c
+++ b/tools/testing/selftests/kvm/kvm_binary_stats_test.c
@@ -174,6 +174,9 @@ static void vm_stats_test(struct kvm_vm *vm)
stats_test(stats_fd);
close(stats_fd);
TEST_ASSERT(fcntl(stats_fd, F_GETFD) == -1, "Stats fd not freed");
+
+ /* Dump VM stats */
+ dump_vm_stats(vm);
}
static void vcpu_stats_test(struct kvm_vm *vm, int vcpu_id)
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 11a692cf4570..f87df68b150d 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -2562,3 +2562,146 @@ int vcpu_get_stats_fd(struct kvm_vm *vm, uint32_t vcpuid)
return ioctl(vcpu->fd, KVM_GET_STATS_FD, NULL);
}
+
+/* Caller is responsible for freeing the returned kvm_stats_header. */
+static struct kvm_stats_header *read_vm_stats_header(int stats_fd)
+{
+ struct kvm_stats_header *header;
+ ssize_t ret;
+
+ /* Read kvm stats header */
+ header = malloc(sizeof(*header));
+ TEST_ASSERT(header, "Allocate memory for stats header");
+
+ ret = read(stats_fd, header, sizeof(*header));
+ TEST_ASSERT(ret == sizeof(*header), "Read stats header");
+
+ return header;
+}
+
+static void dump_header(int stats_fd, struct kvm_stats_header *header)
+{
+ ssize_t ret;
+ char *id;
+
+ printf("flags: %u\n", header->flags);
+ printf("name size: %u\n", header->name_size);
+ printf("num_desc: %u\n", header->num_desc);
+ printf("id_offset: %u\n", header->id_offset);
+ printf("desc_offset: %u\n", header->desc_offset);
+ printf("data_offset: %u\n", header->data_offset);
+
+ /* Read kvm stats id string */
+ id = malloc(header->name_size);
+ TEST_ASSERT(id, "Allocate memory for id string");
+ ret = pread(stats_fd, id, header->name_size, header->id_offset);
+ TEST_ASSERT(ret == header->name_size, "Read id string");
+
+ printf("id: %s\n", id);
+
+ free(id);
+}
+
+static ssize_t stats_desc_size(struct kvm_stats_header *header)
+{
+ return sizeof(struct kvm_stats_desc) + header->name_size;
+}
+
+/* Caller is responsible for freeing the returned kvm_stats_desc. */
+static struct kvm_stats_desc *read_vm_stats_desc(int stats_fd,
+ struct kvm_stats_header *header)
+{
+ struct kvm_stats_desc *stats_desc;
+ size_t size_desc;
+ ssize_t ret;
+
+ size_desc = header->num_desc * stats_desc_size(header);
+
+ /* Allocate memory for stats descriptors */
+ stats_desc = malloc(size_desc);
+ TEST_ASSERT(stats_desc, "Allocate memory for stats descriptors");
+
+ /* Read kvm stats descriptors */
+ ret = pread(stats_fd, stats_desc, size_desc, header->desc_offset);
+ TEST_ASSERT(ret == size_desc, "Read KVM stats descriptors");
+
+ return stats_desc;
+}
+
+/* Caller is responsible for freeing the memory *data. */
+static int read_stat_data(int stats_fd, struct kvm_stats_header *header,
+ struct kvm_stats_desc *desc, uint64_t **data)
+{
+ u64 *stats_data;
+ ssize_t ret;
+
+ stats_data = malloc(desc->size * sizeof(*stats_data));
+
+ ret = pread(stats_fd, stats_data, desc->size * sizeof(*stats_data),
+ header->data_offset + desc->offset);
+
+ /* ret is in bytes. */
+ ret = ret / sizeof(*stats_data);
+
+ TEST_ASSERT(ret == desc->size,
+ "Read data of KVM stats: %s", desc->name);
+
+ *data = stats_data;
+
+ return ret;
+}
+
+static void dump_stat(int stats_fd, struct kvm_stats_header *header,
+ struct kvm_stats_desc *desc)
+{
+ u64 *stats_data;
+ ssize_t ret;
+ int i;
+
+ printf("\tflags: %u\n", desc->flags);
+ printf("\texponent: %u\n", desc->exponent);
+ printf("\tsize: %u\n", desc->size);
+ printf("\toffset: %u\n", desc->offset);
+ printf("\tbucket_size: %u\n", desc->bucket_size);
+ printf("\tname: %s\n", (char *)&desc->name);
+
+ ret = read_stat_data(stats_fd, header, desc, &stats_data);
+
+ printf("\tdata: %lu", *stats_data);
+ for (i = 1; i < ret; i++)
+ printf(", %lu", *(stats_data + i));
+ printf("\n\n");
+
+ free(stats_data);
+}
+
+void dump_vm_stats(struct kvm_vm *vm)
+{
+ struct kvm_stats_desc *stats_desc;
+ struct kvm_stats_header *header;
+ struct kvm_stats_desc *desc;
+ size_t size_desc;
+ int stats_fd;
+ int i;
+
+ stats_fd = vm_get_stats_fd(vm);
+
+ header = read_vm_stats_header(stats_fd);
+ dump_header(stats_fd, header);
+
+ stats_desc = read_vm_stats_desc(stats_fd, header);
+
+ size_desc = stats_desc_size(header);
+
+ /* Read kvm stats data one by one */
+ for (i = 0; i < header->num_desc; ++i) {
+ desc = (void *)stats_desc + (i * size_desc);
+ dump_stat(stats_fd, header, desc);
+ }
+
+ free(stats_desc);
+ free(header);
+
+ close(stats_fd);
+}
+
--
2.35.1.1021.g381101b075-goog
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