Commit 6204004d authored by Yanan Wang's avatar Yanan Wang Committed by Marc Zyngier
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KVM: arm64: Introduce two cache maintenance callbacks 



To prepare for performing CMOs for guest stage-2 in the fault handlers
in pgtable.c, here introduce two cache maintenance callbacks in struct
kvm_pgtable_mm_ops. We also adjust the comment alignment for the
existing part but make no real content change at all.

Reviewed-by: default avatarFuad Tabba <tabba@google.com>
Signed-off-by: default avatarYanan Wang <wangyanan55@huawei.com>
[maz: fixed up comments and renamed callbacks]
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210617105824.31752-2-wangyanan55@huawei.com
parent 8124c8a6

arch/arm64/include/asm/kvm_pgtable.h

+25 −17
Original line number Diff line number Diff line
@@ -27,23 +27,29 @@ typedef u64 kvm_pte_t; 


/**

 * struct kvm_pgtable_mm_ops - Memory management callbacks.

 * @zalloc_page:	Allocate a single zeroed memory page. The @arg parameter

 *			can be used by the walker to pass a memcache. The

 *			initial refcount of the page is 1.

 * @zalloc_pages_exact:	Allocate an exact number of zeroed memory pages. The

 *			@size parameter is in bytes, and is rounded-up to the

 *			next page boundary. The resulting allocation is

 *			physically contiguous.

 * @zalloc_page:		Allocate a single zeroed memory page.

 *				The @arg parameter can be used by the walker

 *				to pass a memcache. The initial refcount of

 *				the page is 1.

 * @zalloc_pages_exact:		Allocate an exact number of zeroed memory pages.

 *				The @size parameter is in bytes, and is rounded

 *				up to the next page boundary. The resulting

 *				allocation is physically contiguous.

 * @free_pages_exact:		Free an exact number of memory pages previously

 *				allocated by zalloc_pages_exact.

 * @get_page:			Increment the refcount on a page.

 * @put_page:		Decrement the refcount on a page. When the refcount

 *			reaches 0 the page is automatically freed.

 * @put_page:			Decrement the refcount on a page. When the

 *				refcount reaches 0 the page is automatically

 *				freed.

 * @page_count:			Return the refcount of a page.

 * @phys_to_virt:	Convert a physical address into a virtual address mapped

 *			in the current context.

 * @virt_to_phys:	Convert a virtual address mapped in the current context

 *			into a physical address.

 * @phys_to_virt:		Convert a physical address into a virtual

 *				address	mapped in the current context.

 * @virt_to_phys:		Convert a virtual address mapped in the current

 *				context into a physical address.

 * @dcache_clean_inval_poc:	Clean and invalidate the data cache to the PoC

 *				for the	specified memory address range.

 * @icache_inval_pou:		Invalidate the instruction cache to the PoU

 *				for the specified memory address range.

 */

struct kvm_pgtable_mm_ops {

	void*		(*zalloc_page)(void *arg);
@@ -54,6 +60,8 @@ 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		(*dcache_clean_inval_poc)(void *addr, size_t size);

	void		(*icache_inval_pou)(void *addr, size_t size);

};



/**