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KVM: arm64: Add support for stage-2 cache flushing in generic page-table

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Add support for cache flushing a range of the stage-2 address space 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/20200911132529.19844-15-will@kernel.org
This commit is contained in:
Quentin Perret
2020-09-11 14:25:22 +01:00
committed by Marc Zyngier
parent cc38d61cac
commit 93c66b40d7
2 changed files with 41 additions and 0 deletions
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15
arch/arm64/include/asm/kvm_pgtable.h
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@@ -248,6 +248,21 @@ kvm_pte_t kvm_pgtable_stage2_mkold(struct kvm_pgtable *pgt, u64 addr);
*/
bool kvm_pgtable_stage2_is_young(struct kvm_pgtable *pgt, u64 addr);
/**
* kvm_pgtable_stage2_flush_range() - Clean and invalidate data cache to Point
* of Coherency for guest stage-2 address
* range.
* @pgt: Page-table structure initialised by kvm_pgtable_stage2_init().
* @addr: Intermediate physical address from which to flush.
* @size: Size of the range.
*
* The offset of @addr within a page is ignored and @size is rounded-up to
* the next page boundary.
*
* Return: 0 on success, negative error code on failure.
*/
int kvm_pgtable_stage2_flush(struct kvm_pgtable *pgt, u64 addr, u64 size);
/**
* kvm_pgtable_walk() - Walk a page-table.
* @pgt: Page-table structure initialised by kvm_pgtable_*_init().