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KVM: arm64: Introduce KVM_PGTABLE_S2_IDMAP stage 2 flag

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Introduce a new stage 2 configuration flag to specify that all mappings
in a given page-table will be identity-mapped, as will be the case for
the host. This allows to introduce sanity checks in the map path and to
avoid programming errors.

Suggested-by: Will Deacon <will@kernel.org>
Signed-off-by: Quentin Perret <qperret@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210319100146.1149909-34-qperret@google.com
This commit is contained in:
Quentin Perret 2021-03-19 10:01:41 +00:00 committed by Marc Zyngier
parent bc224df155
commit 8942a237c7
2 changed files with 5 additions and 0 deletions
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2
arch/arm64/include/asm/kvm_pgtable.h
View File

@ -60,9 +60,11 @@ struct kvm_pgtable_mm_ops {
* enum kvm_pgtable_stage2_flags - Stage-2 page-table flags.
* @KVM_PGTABLE_S2_NOFWB: Don't enforce Normal-WB even if the CPUs have
* ARM64_HAS_STAGE2_FWB.
* @KVM_PGTABLE_S2_IDMAP: Only use identity mappings.
*/
enum kvm_pgtable_stage2_flags {
KVM_PGTABLE_S2_NOFWB = BIT(0),
KVM_PGTABLE_S2_IDMAP = BIT(1),
};
/**

3
arch/arm64/kvm/hyp/pgtable.c
View File

@ -760,6 +760,9 @@ int kvm_pgtable_stage2_map(struct kvm_pgtable *pgt, u64 addr, u64 size,
.arg = &map_data,
};
if (WARN_ON((pgt->flags & KVM_PGTABLE_S2_IDMAP) && (addr != phys)))
return -EINVAL;
ret = stage2_set_prot_attr(pgt, prot, &map_data.attr);
if (ret)
return ret;