linux-kernel - Re: [PATCH v4 02/10] KVM: selftests: Read binary stats header in lib

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Message-ID: <CALzav=cRWQ5dHbR75AoFnXUuAWLcNfoG+aepO4GOyzsU0oWV7A@mail.gmail.com>
Date:   Mon, 11 Apr 2022 14:55:57 -0700
From:   David Matlack <dmatlack@...gle.com>
To:     Ben Gardon <bgardon@...gle.com>
Cc:     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>,
        Mingwei Zhang <mizhang@...gle.com>,
        Jing Zhang <jingzhangos@...gle.com>
Subject: Re: [PATCH v4 02/10] KVM: selftests: Read binary stats header in lib

On Mon, Apr 11, 2022 at 2:10 PM Ben Gardon <bgardon@...gle.com> wrote:
>
> Move the code to read the binary stats header to the KVM selftests
> library. It will be re-used by other tests to check KVM behavior.
>
> No functional change intended.
>
> Signed-off-by: Ben Gardon <bgardon@...gle.com>
> ---
>  tools/testing/selftests/kvm/include/kvm_util_base.h | 1 +
>  tools/testing/selftests/kvm/kvm_binary_stats_test.c | 4 ++--
>  tools/testing/selftests/kvm/lib/kvm_util.c          | 8 ++++++++
>  3 files changed, 11 insertions(+), 2 deletions(-)
>
> diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
> index 92cef0ffb19e..5ba3132f3110 100644
> --- a/tools/testing/selftests/kvm/include/kvm_util_base.h
> +++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
> @@ -400,6 +400,7 @@ 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 read_vm_stats_header(int stats_fd, struct kvm_stats_header *header);
>
>  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 dad34d8a41fe..22c22a90f15a 100644
> --- a/tools/testing/selftests/kvm/kvm_binary_stats_test.c
> +++ b/tools/testing/selftests/kvm/kvm_binary_stats_test.c
> @@ -33,8 +33,8 @@ static void stats_test(int stats_fd)
>         struct kvm_stats_desc *pdesc;
>
>         /* Read kvm stats header */
> -       ret = read(stats_fd, &header, sizeof(header));
> -       TEST_ASSERT(ret == sizeof(header), "Read stats header");
> +       read_vm_stats_header(stats_fd, &header);

stats_test() is used to test both VM and vCPU stats. The only
difference is whether stats_fd is the VM stats fd or a vCPU stats fd.

Given that, please rename read_vm_stats_header() to something more
generic (since it can also be used for reading the vCPU stats header).
e.g. read_stats_header().

> +
>         size_desc = sizeof(*stats_desc) + header.name_size;
>
>         /* Read kvm stats id string */
> diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> index 1665a220abcb..0caf28e324ed 100644
> --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> @@ -2556,3 +2556,11 @@ int vcpu_get_stats_fd(struct kvm_vm *vm, uint32_t vcpuid)
>
>         return ioctl(vcpu->fd, KVM_GET_STATS_FD, NULL);
>  }
> +
> +void read_vm_stats_header(int stats_fd, struct kvm_stats_header *header)
> +{
> +       ssize_t ret;
> +
> +       ret = read(stats_fd, header, sizeof(*header));
> +       TEST_ASSERT(ret == sizeof(*header), "Read stats header");
> +}
> --
> 2.35.1.1178.g4f1659d476-goog
>