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| author | Sean Christopherson <sean.j.christopherson@intel.com> | 2020-07-02 19:35:38 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-07-09 13:29:42 -0400 |
| commit | 2aa9c199cf8151c190c7e7ca3ddfcfbb2d85ac36 (patch) | |
| tree | d17c6d523734ff93e3a7e0027d4a8fb163484b86 /include | |
| parent | 94ce87ef8177e436c5ee46b211c4e0cf490ae389 (diff) | |
| download | lwn-2aa9c199cf8151c190c7e7ca3ddfcfbb2d85ac36.tar.gz lwn-2aa9c199cf8151c190c7e7ca3ddfcfbb2d85ac36.zip | |
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.
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-generic/kvm_types.h | 5 | ||||
| -rw-r--r-- | include/linux/kvm_types.h | 19 |
2 files changed, 24 insertions, 0 deletions
diff --git a/include/asm-generic/kvm_types.h b/include/asm-generic/kvm_types.h new file mode 100644 index 000000000000..2a82daf110f1 --- /dev/null +++ b/include/asm-generic/kvm_types.h @@ -0,0 +1,5 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_GENERIC_KVM_TYPES_H +#define _ASM_GENERIC_KVM_TYPES_H + +#endif diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h index 68e84cf42a3f..a7580f69dda0 100644 --- a/include/linux/kvm_types.h +++ b/include/linux/kvm_types.h @@ -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__ */ |