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

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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.

Suggested-by: Christoffer Dall <christoffer.dall@arm.com>
Reviewed-by: Ben Gardon <bgardon@google.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200703023545.8771-15-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2020-07-02 19:35:38 -07:00 • committed by Paolo Bonzini
parent 94ce87ef81
commit 2aa9c199cf
8 changed files with 35 additions and 13 deletions
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19
include/linux/kvm_types.h
View file

@ -20,6 +20,8 @@ enum kvm_mr_change;
#include <linux/types.h>
#include <asm/kvm_types.h>
/*
* Address types:
*
@ -58,4 +60,21 @@ struct gfn_to_pfn_cache {
bool dirty;
};
#ifdef KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE
/*
* Memory caches are used to preallocate memory ahead of various MMU flows,
* e.g. page fault handlers. Gracefully handling allocation failures deep in
* MMU flows is problematic, as is triggering reclaim, I/O, etc... while
* holding MMU locks. Note, these caches act more like prefetch buffers than
* classical caches, i.e. objects are not returned to the cache on being freed.
*/
struct kvm_mmu_memory_cache {
int nobjs;
gfp_t gfp_zero;
struct kmem_cache *kmem_cache;
void *objects[KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE];
};
#endif
#endif /* __KVM_TYPES_H__ */