[PATCH v6 1/4] KVM: arm64: Introduce cache maintenance callbacks for guest stage-2

[Yanan Wang <wangyanan55@huawei.com>]

To prepare for performing guest CMOs in the fault handlers in pgtable.c,
introduce two cache maintenance callbacks in struct kvm_pgtable_mm_ops.

The new callbacks are specific for guest stage-2, so they will only be
initialized in 'struct kvm_pgtable_mm_ops kvm_s2_mm_ops'.

Signed-off-by: Yanan Wang <wangyanan55@huawei.com>
---
 arch/arm64/include/asm/kvm_pgtable.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h
index c3674c47d48c..302eca32e0af 100644
--- a/arch/arm64/include/asm/kvm_pgtable.h
+++ b/arch/arm64/include/asm/kvm_pgtable.h
@@ -44,6 +44,11 @@ typedef u64 kvm_pte_t;
  *			in the current context.
  * @virt_to_phys:	Convert a virtual address mapped in the current context
  *			into a physical address.
+ * @flush_dcache:	Clean data cache for a guest page address range before
+ *			creating the corresponding stage-2 mapping.
+ * @flush_icache:	Invalidate instruction cache for a guest page address
+ *			range before creating or updating the corresponding
+ *			stage-2 mapping.
  */
 struct kvm_pgtable_mm_ops {
 	void*		(*zalloc_page)(void *arg);
@@ -54,6 +59,8 @@ struct kvm_pgtable_mm_ops {
 	int		(*page_count)(void *addr);
 	void*		(*phys_to_virt)(phys_addr_t phys);
 	phys_addr_t	(*virt_to_phys)(void *addr);
+	void		(*flush_dcache)(void *addr, size_t size);
+	void		(*flush_icache)(void *addr, size_t size);
 };
 
 /**
-- 
2.23.0