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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
This commit is contained in:
Quentin Perret 2020-09-11 14:25:20 +01:00 committed by Marc Zyngier
parent ee8efad799
commit 73d49df2c3
2 changed files with 24 additions and 0 deletions
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18
arch/arm64/include/asm/kvm_pgtable.h
View File

@ -186,6 +186,24 @@ int kvm_pgtable_stage2_map(struct kvm_pgtable *pgt, u64 addr, u64 size,
*/
int kvm_pgtable_stage2_unmap(struct kvm_pgtable *pgt, u64 addr, u64 size);
/**
* kvm_pgtable_stage2_wrprotect() - Write-protect guest stage-2 address range
* without TLB invalidation.
* @pgt: Page-table structure initialised by kvm_pgtable_stage2_init().
* @addr: Intermediate physical address from which to write-protect,
* @size: Size of the range.
*
* The offset of @addr within a page is ignored and @size is rounded-up to
* the next page boundary.
*
* Note that it is the caller's responsibility to invalidate the TLB after
* calling this function to ensure that the updated permissions are visible
* to the CPUs.
*
* Return: 0 on success, negative error code on failure.
*/
int kvm_pgtable_stage2_wrprotect(struct kvm_pgtable *pgt, u64 addr, u64 size);
/**
* kvm_pgtable_stage2_mkyoung() - Set the access flag in a page-table entry.
* @pgt: Page-table structure initialised by kvm_pgtable_stage2_init().

6
arch/arm64/kvm/hyp/pgtable.c
View File

@ -746,6 +746,12 @@ static int stage2_update_leaf_attrs(struct kvm_pgtable *pgt, u64 addr,
return 0;
}
int kvm_pgtable_stage2_wrprotect(struct kvm_pgtable *pgt, u64 addr, u64 size)
{
return stage2_update_leaf_attrs(pgt, addr, size, 0,
KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W, NULL);
}
kvm_pte_t kvm_pgtable_stage2_mkyoung(struct kvm_pgtable *pgt, u64 addr)
{
kvm_pte_t pte = 0;