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Message-ID: <YlSw0UXTYqgx4wa3@google.com>
Date: Mon, 11 Apr 2022 22:50:57 +0000
From: Mingwei Zhang <mizhang@...gle.com>
To: David Matlack <dmatlack@...gle.com>
Cc: Ben Gardon <bgardon@...gle.com>,
LKML <linux-kernel@...r.kernel.org>,
kvm list <kvm@...r.kernel.org>,
Paolo Bonzini <pbonzini@...hat.com>,
Peter Xu <peterx@...hat.com>,
Sean Christopherson <seanjc@...gle.com>,
Peter Shier <pshier@...gle.com>,
David Dunn <daviddunn@...gle.com>,
Junaid Shahid <junaids@...gle.com>,
Jim Mattson <jmattson@...gle.com>,
Jing Zhang <jingzhangos@...gle.com>
Subject: Re: [PATCH v4 01/10] KVM: selftests: Remove dynamic memory
allocation for stats header
On Mon, Apr 11, 2022, David Matlack wrote:
> On Mon, Apr 11, 2022 at 2:10 PM Ben Gardon <bgardon@...gle.com> wrote:
> >
> > There's no need to allocate dynamic memory for the stats header since
> > its size is known at compile time.
> >
> > Signed-off-by: Ben Gardon <bgardon@...gle.com>
>
> Reviewed-by: David Matlack <dmatlack@...gle.com>
>
Reviewed-by: Mingwei Zhang <mizhang@...gle.com>
> > ---
> > .../selftests/kvm/kvm_binary_stats_test.c | 58 +++++++++----------
> > 1 file changed, 27 insertions(+), 31 deletions(-)
> >
> > diff --git a/tools/testing/selftests/kvm/kvm_binary_stats_test.c b/tools/testing/selftests/kvm/kvm_binary_stats_test.c
> > index 17f65d514915..dad34d8a41fe 100644
> > --- a/tools/testing/selftests/kvm/kvm_binary_stats_test.c
> > +++ b/tools/testing/selftests/kvm/kvm_binary_stats_test.c
> > @@ -26,56 +26,53 @@ static void stats_test(int stats_fd)
> > int i;
> > size_t size_desc;
> > size_t size_data = 0;
> > - struct kvm_stats_header *header;
> > + struct kvm_stats_header header;
> > char *id;
> > struct kvm_stats_desc *stats_desc;
> > u64 *stats_data;
> > struct kvm_stats_desc *pdesc;
> >
> > /* 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");
> > - size_desc = sizeof(*stats_desc) + header->name_size;
> > + ret = read(stats_fd, &header, sizeof(header));
> > + TEST_ASSERT(ret == sizeof(header), "Read stats header");
> > + size_desc = sizeof(*stats_desc) + header.name_size;
> >
> > /* Read kvm stats id string */
> > - id = malloc(header->name_size);
> > + id = malloc(header.name_size);
> > TEST_ASSERT(id, "Allocate memory for id string");
> > - ret = read(stats_fd, id, header->name_size);
> > - TEST_ASSERT(ret == header->name_size, "Read id string");
> > + ret = read(stats_fd, id, header.name_size);
> > + TEST_ASSERT(ret == header.name_size, "Read id string");
> >
> > /* Check id string, that should start with "kvm" */
> > - TEST_ASSERT(!strncmp(id, "kvm", 3) && strlen(id) < header->name_size,
> > + TEST_ASSERT(!strncmp(id, "kvm", 3) && strlen(id) < header.name_size,
> > "Invalid KVM stats type, id: %s", id);
> >
> > /* Sanity check for other fields in header */
> > - if (header->num_desc == 0) {
> > + if (header.num_desc == 0) {
> > printf("No KVM stats defined!");
> > return;
> > }
> > /* Check overlap */
> > - TEST_ASSERT(header->desc_offset > 0 && header->data_offset > 0
> > - && header->desc_offset >= sizeof(*header)
> > - && header->data_offset >= sizeof(*header),
> > + TEST_ASSERT(header.desc_offset > 0 && header.data_offset > 0
> > + && header.desc_offset >= sizeof(header)
> > + && header.data_offset >= sizeof(header),
> > "Invalid offset fields in header");
> > - TEST_ASSERT(header->desc_offset > header->data_offset ||
> > - (header->desc_offset + size_desc * header->num_desc <=
> > - header->data_offset),
> > + TEST_ASSERT(header.desc_offset > header.data_offset ||
> > + (header.desc_offset + size_desc * header.num_desc <=
> > + header.data_offset),
> > "Descriptor block is overlapped with data block");
> >
> > /* Allocate memory for stats descriptors */
> > - stats_desc = calloc(header->num_desc, size_desc);
> > + stats_desc = calloc(header.num_desc, size_desc);
> > TEST_ASSERT(stats_desc, "Allocate memory for stats descriptors");
> > /* Read kvm stats descriptors */
> > ret = pread(stats_fd, stats_desc,
> > - size_desc * header->num_desc, header->desc_offset);
> > - TEST_ASSERT(ret == size_desc * header->num_desc,
> > + size_desc * header.num_desc, header.desc_offset);
> > + TEST_ASSERT(ret == size_desc * header.num_desc,
> > "Read KVM stats descriptors");
> >
> > /* Sanity check for fields in descriptors */
> > - for (i = 0; i < header->num_desc; ++i) {
> > + for (i = 0; i < header.num_desc; ++i) {
> > pdesc = (void *)stats_desc + i * size_desc;
> > /* Check type,unit,base boundaries */
> > TEST_ASSERT((pdesc->flags & KVM_STATS_TYPE_MASK)
> > @@ -104,7 +101,7 @@ static void stats_test(int stats_fd)
> > break;
> > }
> > /* Check name string */
> > - TEST_ASSERT(strlen(pdesc->name) < header->name_size,
> > + TEST_ASSERT(strlen(pdesc->name) < header.name_size,
> > "KVM stats name(%s) too long", pdesc->name);
> > /* Check size field, which should not be zero */
> > TEST_ASSERT(pdesc->size, "KVM descriptor(%s) with size of 0",
> > @@ -124,14 +121,14 @@ static void stats_test(int stats_fd)
> > size_data += pdesc->size * sizeof(*stats_data);
> > }
> > /* Check overlap */
> > - TEST_ASSERT(header->data_offset >= header->desc_offset
> > - || header->data_offset + size_data <= header->desc_offset,
> > + TEST_ASSERT(header.data_offset >= header.desc_offset
> > + || header.data_offset + size_data <= header.desc_offset,
> > "Data block is overlapped with Descriptor block");
> > /* Check validity of all stats data size */
> > - TEST_ASSERT(size_data >= header->num_desc * sizeof(*stats_data),
> > + TEST_ASSERT(size_data >= header.num_desc * sizeof(*stats_data),
> > "Data size is not correct");
> > /* Check stats offset */
> > - for (i = 0; i < header->num_desc; ++i) {
> > + for (i = 0; i < header.num_desc; ++i) {
> > pdesc = (void *)stats_desc + i * size_desc;
> > TEST_ASSERT(pdesc->offset < size_data,
> > "Invalid offset (%u) for stats: %s",
> > @@ -142,15 +139,15 @@ static void stats_test(int stats_fd)
> > stats_data = malloc(size_data);
> > TEST_ASSERT(stats_data, "Allocate memory for stats data");
> > /* Read kvm stats data as a bulk */
> > - ret = pread(stats_fd, stats_data, size_data, header->data_offset);
> > + ret = pread(stats_fd, stats_data, size_data, header.data_offset);
> > TEST_ASSERT(ret == size_data, "Read KVM stats data");
> > /* Read kvm stats data one by one */
> > size_data = 0;
> > - for (i = 0; i < header->num_desc; ++i) {
> > + for (i = 0; i < header.num_desc; ++i) {
> > pdesc = (void *)stats_desc + i * size_desc;
> > ret = pread(stats_fd, stats_data,
> > pdesc->size * sizeof(*stats_data),
> > - header->data_offset + size_data);
> > + header.data_offset + size_data);
> > TEST_ASSERT(ret == pdesc->size * sizeof(*stats_data),
> > "Read data of KVM stats: %s", pdesc->name);
> > size_data += pdesc->size * sizeof(*stats_data);
> > @@ -159,7 +156,6 @@ static void stats_test(int stats_fd)
> > free(stats_data);
> > free(stats_desc);
> > free(id);
> > - free(header);
> > }
> >
> >
> > --
> > 2.35.1.1178.g4f1659d476-goog
> >
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