KVM: Move x86's version of struct kvm_mmu_memory_cache to common code

Move x86's 'struct kvm_mmu_memory_cache' to common code in anticipation of moving the entire x86 implementation code to common KVM and reusing it for arm64 and MIPS. Add a new architecture specific asm/kvm_types.h to control the existence and parameters of the struct. The new header is needed to avoid a chicken-and-egg problem with asm/kvm_host.h as all architectures define instances of the struct in their vCPU structs. Add an asm-generic version of kvm_types.h to avoid having empty files on PPC and s390 in the long term, and for arm64 and mips in the short term.

Sean Christopherson committed 6 years ago

Commit 2aa9c191 parent 94ce87e8 files · +35 −13Browse files

Showing the changes to include/linux (1 of 8 files). Show all

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include/linux/kvm_types.h+19−0

@@ -20,6 +20,8 @@ enum kvm_mr_change; · 19 unmodified lines
20		20
21	#include <linux/types.h>	21	#include <linux/types.h>
22		22
		23	#include <asm/kvm_types.h>
		24
23	/*	25	/*
24	* Address types:	26	* Address types:
25	*	27	*
@@ -58,4 +60,21 @@ struct gfn_to_pfn_cache { · 32 unmodified lines
58	bool dirty;	60	bool dirty;
59	};	61	};
60		62
		63	#ifdef KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE
		64	/*
		65	* Memory caches are used to preallocate memory ahead of various MMU flows,
		66	* e.g. page fault handlers. Gracefully handling allocation failures deep in
		67	* MMU flows is problematic, as is triggering reclaim, I/O, etc... while
		68	* holding MMU locks. Note, these caches act more like prefetch buffers than
		69	* classical caches, i.e. objects are not returned to the cache on being freed.
		70	*/
		71	struct kvm_mmu_memory_cache {
		72	int nobjs;
		73	gfp_t gfp_zero;
		74	struct kmem_cache *kmem_cache;
		75	void *objects[KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE];
		76	};
		77	#endif
		78
		79
61	#endif /* __KVM_TYPES_H__ */	80	#endif /* __KVM_TYPES_H__ */