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KVM: arm64: Add support for stage-2 write-protect in generic page-table
Add a stage-2 wrprotect() operation to the generic page-table code. Signed-off-by: Quentin Perret <qperret@google.com> 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> Link: https://lore.kernel.org/r/20200911132529.19844-13-will@kernel.org
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2 changed files with 24 additions and 0 deletions
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@ -186,6 +186,24 @@ int kvm_pgtable_stage2_map(struct kvm_pgtable *pgt, u64 addr, u64 size,
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*/
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*/
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int kvm_pgtable_stage2_unmap(struct kvm_pgtable *pgt, u64 addr, u64 size);
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int kvm_pgtable_stage2_unmap(struct kvm_pgtable *pgt, u64 addr, u64 size);
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/**
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* kvm_pgtable_stage2_wrprotect() - Write-protect guest stage-2 address range
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* without TLB invalidation.
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* @pgt: Page-table structure initialised by kvm_pgtable_stage2_init().
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* @addr: Intermediate physical address from which to write-protect,
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* @size: Size of the range.
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*
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* The offset of @addr within a page is ignored and @size is rounded-up to
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* the next page boundary.
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*
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* Note that it is the caller's responsibility to invalidate the TLB after
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* calling this function to ensure that the updated permissions are visible
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* to the CPUs.
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*
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* Return: 0 on success, negative error code on failure.
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*/
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int kvm_pgtable_stage2_wrprotect(struct kvm_pgtable *pgt, u64 addr, u64 size);
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/**
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/**
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* kvm_pgtable_stage2_mkyoung() - Set the access flag in a page-table entry.
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* kvm_pgtable_stage2_mkyoung() - Set the access flag in a page-table entry.
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* @pgt: Page-table structure initialised by kvm_pgtable_stage2_init().
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* @pgt: Page-table structure initialised by kvm_pgtable_stage2_init().
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@ -746,6 +746,12 @@ static int stage2_update_leaf_attrs(struct kvm_pgtable *pgt, u64 addr,
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return 0;
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return 0;
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}
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}
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int kvm_pgtable_stage2_wrprotect(struct kvm_pgtable *pgt, u64 addr, u64 size)
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{
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return stage2_update_leaf_attrs(pgt, addr, size, 0,
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KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W, NULL);
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}
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kvm_pte_t kvm_pgtable_stage2_mkyoung(struct kvm_pgtable *pgt, u64 addr)
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kvm_pte_t kvm_pgtable_stage2_mkyoung(struct kvm_pgtable *pgt, u64 addr)
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{
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{
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kvm_pte_t pte = 0;
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kvm_pte_t pte = 0;
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