diff options
| author | Marc Zyngier <maz@kernel.org> | 2021-07-26 16:35:47 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2021-08-02 14:05:58 +0100 |
| commit | 63db506e07622c344a3c748a1c06293d48780f83 (patch) | |
| tree | 4e07a2db557d2e400fda13baff43387b9b25f8aa /arch/arm64/include/asm/kvm_pgtable.h | |
| parent | c500bee1c5b2f1d59b1081ac879d73268ab0ff17 (diff) | |
KVM: arm64: Introduce helper to retrieve a PTE and its level
It is becoming a common need to fetch the PTE for a given address
together with its level. Add such a helper.
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Quentin Perret <qperret@google.com>
Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com>
Link: https://lore.kernel.org/r/20210726153552.1535838-2-maz@kernel.org
Diffstat (limited to 'arch/arm64/include/asm/kvm_pgtable.h')
| -rw-r--r-- | arch/arm64/include/asm/kvm_pgtable.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h index f004c0115d89..e42b55bd50a2 100644 --- a/arch/arm64/include/asm/kvm_pgtable.h +++ b/arch/arm64/include/asm/kvm_pgtable.h @@ -433,6 +433,26 @@ int kvm_pgtable_walk(struct kvm_pgtable *pgt, u64 addr, u64 size, struct kvm_pgtable_walker *walker); /** + * kvm_pgtable_get_leaf() - Walk a page-table and retrieve the leaf entry + * with its level. + * @pgt: Page-table structure initialised by kvm_pgtable_*_init() + * or a similar initialiser. + * @addr: Input address for the start of the walk. + * @ptep: Pointer to storage for the retrieved PTE. + * @level: Pointer to storage for the level of the retrieved PTE. + * + * The offset of @addr within a page is ignored. + * + * The walker will walk the page-table entries corresponding to the input + * address specified, retrieving the leaf corresponding to this address. + * Invalid entries are treated as leaf entries. + * + * Return: 0 on success, negative error code on failure. + */ +int kvm_pgtable_get_leaf(struct kvm_pgtable *pgt, u64 addr, + kvm_pte_t *ptep, u32 *level); + +/** * kvm_pgtable_stage2_find_range() - Find a range of Intermediate Physical * Addresses with compatible permission * attributes. |