diff options
| author | Will Deacon <will@kernel.org> | 2020-09-11 14:25:24 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2020-09-11 15:51:15 +0100 |
| commit | adcd4e23291e67575be0c8b08eed04fbe7fd9e77 (patch) | |
| tree | d686875c1a9320c694c212a24073adf15177da9c /arch/arm64/include | |
| parent | 8d5207bef6913b5fac91cb58e509711e406c160d (diff) | |
| download | linux-adcd4e23291e67575be0c8b08eed04fbe7fd9e77.tar.gz | |
KVM: arm64: Add support for relaxing stage-2 perms in generic page-table code
Add support for relaxing the permissions of a stage-2 mapping (i.e.
adding additional permissions) to the generic page-table code.
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Quentin Perret <qperret@google.com>
Link: https://lore.kernel.org/r/20200911132529.19844-17-will@kernel.org
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/kvm_pgtable.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h index 77c027456c61..52ab38db04c7 100644 --- a/arch/arm64/include/asm/kvm_pgtable.h +++ b/arch/arm64/include/asm/kvm_pgtable.h @@ -237,6 +237,25 @@ kvm_pte_t kvm_pgtable_stage2_mkyoung(struct kvm_pgtable *pgt, u64 addr); kvm_pte_t kvm_pgtable_stage2_mkold(struct kvm_pgtable *pgt, u64 addr); /** + * kvm_pgtable_stage2_relax_perms() - Relax the permissions enforced by a + * page-table entry. + * @pgt: Page-table structure initialised by kvm_pgtable_stage2_init(). + * @addr: Intermediate physical address to identify the page-table entry. + * @prot: Additional permissions to grant for the mapping. + * + * The offset of @addr within a page is ignored. + * + * If there is a valid, leaf page-table entry used to translate @addr, then + * relax the permissions in that entry according to the read, write and + * execute permissions specified by @prot. No permissions are removed, and + * TLB invalidation is performed after updating the entry. + * + * Return: 0 on success, negative error code on failure. + */ +int kvm_pgtable_stage2_relax_perms(struct kvm_pgtable *pgt, u64 addr, + enum kvm_pgtable_prot prot); + +/** * kvm_pgtable_stage2_is_young() - Test whether a page-table entry has the * access flag set. * @pgt: Page-table structure initialised by kvm_pgtable_stage2_init(). |