Re: [RFC PATCH 1/2] KVM: selftests: Add a macro to get string of vm_mem_backing_src_type

Ben Gardon
2021-02-08T18:17:03Z

On Mon, Feb 8, 2021 at 1:08 AM Yanan Wang <wangyanan55@huawei.com> wrote:
>
> Add a macro to get string of the backing source memory type, so that
> application can add choices for source types in the help() function,
> and users can specify which type to use for testing.

Coincidentally, I sent out a change last week to do the same thing:
"KVM: selftests: Add backing src parameter to dirty_log_perf_test"
(https://lkml.org/lkml/2021/2/2/1430)
Whichever way this ends up being implemented, I'm happy to see others
interested in testing different backing source types too.

>
> Signed-off-by: Yanan Wang <wangyanan55@huawei.com>
> ---
> tools/testing/selftests/kvm/include/kvm_util.h | 3 +++
> tools/testing/selftests/kvm/lib/kvm_util.c | 8 ++++++++
> 2 files changed, 11 insertions(+)
>
> diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
> index 5cbb861525ed..f5fc29dc9ee6 100644
> --- a/tools/testing/selftests/kvm/include/kvm_util.h
> +++ b/tools/testing/selftests/kvm/include/kvm_util.h
> @@ -69,7 +69,9 @@ enum vm_guest_mode {
> #define PTES_PER_MIN_PAGE ptes_per_page(MIN_PAGE_SIZE)
>
> #define vm_guest_mode_string(m) vm_guest_mode_string[m]
> +#define vm_mem_backing_src_type_string(s) vm_mem_backing_src_type_string[s]
> extern const char * const vm_guest_mode_string[];
> +extern const char * const vm_mem_backing_src_type_string[];
>
> struct vm_guest_mode_params {
> unsigned int pa_bits;
> @@ -83,6 +85,7 @@ enum vm_mem_backing_src_type {
> VM_MEM_SRC_ANONYMOUS,
> VM_MEM_SRC_ANONYMOUS_THP,
> VM_MEM_SRC_ANONYMOUS_HUGETLB,
> + NUM_VM_BACKING_SRC_TYPES,
> };
>
> int kvm_check_cap(long cap);
> diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> index fa5a90e6c6f0..a9b651c7f866 100644
> --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> @@ -165,6 +165,14 @@ const struct vm_guest_mode_params vm_guest_mode_params[] = {
> _Static_assert(sizeof(vm_guest_mode_params)/sizeof(struct vm_guest_mode_params) == NUM_VM_MODES,
> "Missing new mode params?");
>
> +const char * const vm_mem_backing_src_type_string[] = {
> + "VM_MEM_SRC_ANONYMOUS ",
> + "VM_MEM_SRC_ANONYMOUS_THP ",
> + "VM_MEM_SRC_ANONYMOUS_HUGETLB",
> +};
> +_Static_assert(sizeof(vm_mem_backing_src_type_string)/sizeof(char *) == NUM_VM_BACKING_SRC_TYPES,
> + "Missing new source type strings?");
> +
> /*
> * VM Create
> *
> --
> 2.23.0
>