From: Ackerley Tng <ackerleytng@xxxxxxxxxx> Add sparsebit_for_each_set_range() to allow iterator over a range of set bits in a range. This will be used by x86 SEV guests to process protected physical pages (each such page needs to be encrypted _after_ being "added" to the VM). Tested-by: Carlos Bilbao <carlos.bilbao@xxxxxxx> Signed-off-by: Ackerley Tng <ackerleytng@xxxxxxxxxx> [sean: split to separate patch] Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx> --- .../testing/selftests/kvm/include/sparsebit.h | 20 +++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/tools/testing/selftests/kvm/include/sparsebit.h b/tools/testing/selftests/kvm/include/sparsebit.h index fb5170d57fcb..bc760761e1a3 100644 --- a/tools/testing/selftests/kvm/include/sparsebit.h +++ b/tools/testing/selftests/kvm/include/sparsebit.h @@ -66,6 +66,26 @@ void sparsebit_dump(FILE *stream, const struct sparsebit *sbit, unsigned int indent); void sparsebit_validate_internal(const struct sparsebit *sbit); +/* + * Iterate over an inclusive ranges within sparsebit @s. In each iteration, + * @range_begin and @range_end will take the beginning and end of the set + * range, which are of type sparsebit_idx_t. + * + * For example, if the range [3, 7] (inclusive) is set, within the + * iteration,@range_begin will take the value 3 and @range_end will take + * the value 7. + * + * Ensure that there is at least one bit set before using this macro with + * sparsebit_any_set(), because sparsebit_first_set() will abort if none + * are set. + */ +#define sparsebit_for_each_set_range(s, range_begin, range_end) \ + for (range_begin = sparsebit_first_set(s), \ + range_end = sparsebit_next_clear(s, range_begin) - 1; \ + range_begin && range_end; \ + range_begin = sparsebit_next_set(s, range_end), \ + range_end = sparsebit_next_clear(s, range_begin) - 1) + #ifdef __cplusplus } #endif -- 2.44.0.rc0.258.g7320e95886-goog
