From: Wu Fei <wu.fei9@sanechips.com.cn>

The current gstage range walker unconditionally advances by 'page_size'
when a leaf PTE is not found, e.g. when the range to wp is
[0xfffff01fc000, 0xfffff023c000) , if found_leaf of 0xfffff01fc000
returns false and page_size is 2MB, it skips the whole range, but it's
possible to have valid entries in [0xfffff0200000, 0xfffff023c000), so
only [0xfffff01fc000, 0xfffff0200000) can be skipped safely. Both
wp/unamp have the same pattern.

dirty_log_test intentionally sets up the unaligned guest physical
address, after riscv kvm enabling KVM_DIRTY_LOG_INITIALLY_SET, it's easy
to trigger this bug if there is a larger window for guest to write more
pages before first collect_dirty_pages.

v2:
* reformat
* drop the patch to dirty_log_test, which is replaced by the one from
  Sean: https://github.com/kvm-x86/linux/commit/4e0fdd9b0d7d

Wu Fei (2):
  RISC-V: KVM: Fix skip of valid pages in kvm_riscv_gstage_wp_range
  RISC-V: KVM: Fix skip of valid pages in kvm_riscv_gstage_unmap_range

 arch/riscv/kvm/gstage.c | 38 +++++++++++++++++++++-----------------
 1 file changed, 21 insertions(+), 17 deletions(-)

-- 
2.51.0