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![Sean Christopherson](/assets/img/avatar_default.png)
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>
80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef __KVM_TYPES_H__
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#define __KVM_TYPES_H__
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struct kvm;
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struct kvm_async_pf;
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struct kvm_device_ops;
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struct kvm_interrupt;
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struct kvm_irq_routing_table;
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struct kvm_memory_slot;
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struct kvm_one_reg;
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struct kvm_run;
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struct kvm_userspace_memory_region;
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struct kvm_vcpu;
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struct kvm_vcpu_init;
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struct kvm_memslots;
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enum kvm_mr_change;
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#include <linux/types.h>
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#include <asm/kvm_types.h>
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/*
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* Address types:
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*
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* gva - guest virtual address
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* gpa - guest physical address
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* gfn - guest frame number
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* hva - host virtual address
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* hpa - host physical address
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* hfn - host frame number
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*/
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typedef unsigned long gva_t;
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typedef u64 gpa_t;
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typedef u64 gfn_t;
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#define GPA_INVALID (~(gpa_t)0)
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typedef unsigned long hva_t;
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typedef u64 hpa_t;
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typedef u64 hfn_t;
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typedef hfn_t kvm_pfn_t;
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struct gfn_to_hva_cache {
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u64 generation;
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gpa_t gpa;
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unsigned long hva;
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unsigned long len;
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struct kvm_memory_slot *memslot;
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};
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struct gfn_to_pfn_cache {
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u64 generation;
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gfn_t gfn;
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kvm_pfn_t pfn;
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bool dirty;
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};
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#ifdef KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE
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/*
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* Memory caches are used to preallocate memory ahead of various MMU flows,
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* e.g. page fault handlers. Gracefully handling allocation failures deep in
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* MMU flows is problematic, as is triggering reclaim, I/O, etc... while
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* holding MMU locks. Note, these caches act more like prefetch buffers than
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* classical caches, i.e. objects are not returned to the cache on being freed.
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*/
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struct kvm_mmu_memory_cache {
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int nobjs;
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gfp_t gfp_zero;
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struct kmem_cache *kmem_cache;
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void *objects[KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE];
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};
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#endif
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#endif /* __KVM_TYPES_H__ */
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