The check_host_shared_guest() path expects to find a last-level valid
PTE in the guest's stage-2 page-table. However, it checks the PTE's
level before its validity, which makes it hard for callers to figure out
what went wrong.
To make error handling simpler, check the PTE's validity first.
Signed-off-by: Quentin Perret <qperret@google.com>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20250207145438.1333475-2-qperret@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
ret = kvm_pgtable_get_leaf(&vm->pgt, ipa, &pte, &level);
if (ret)
return ret;
- if (level != KVM_PGTABLE_LAST_LEVEL)
- return -E2BIG;
if (!kvm_pte_valid(pte))
return -ENOENT;
+ if (level != KVM_PGTABLE_LAST_LEVEL)
+ return -E2BIG;
state = guest_get_page_state(pte, ipa);
if (state != PKVM_PAGE_SHARED_BORROWED)