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| author |   Ackerley Tng <ackerleytng@google.com> | 2024-02-22 16:42:50 -0800 |
|---|---|---|
| committer |   Sean Christopherson <seanjc@google.com> | 2024-02-28 20:58:12 +0000 |
| commit | 57e19f05775847d9d8565dad2cee6bbec03cdb06 (patch) | |
| tree | 19477911d2e8e60d0ae7844fff951ad3fea0b06f /tools/testing/selftests/kvm | |
| parent | KVM: selftests: Make sparsebit structs const where appropriate (diff) | |
| download | wireguard-linux-57e19f05775847d9d8565dad2cee6bbec03cdb06.tar.xz wireguard-linux-57e19f05775847d9d8565dad2cee6bbec03cdb06.zip | |
KVM: selftests: Add a macro to iterate over a sparsebit range
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@amd.com>
Signed-off-by: Ackerley Tng <ackerleytng@google.com>
[sean: split to separate patch]
Link: https://lore.kernel.org/r/20240223004258.3104051-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'tools/testing/selftests/kvm')
| -rw-r--r-- | tools/testing/selftests/kvm/include/sparsebit.h | 20 |
1 files changed, 20 insertions, 0 deletions
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 |