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c0461f2063
Introduce kvm_follow_pfn() to eventually supplant the various "gfn_to_pfn" APIs, albeit by adding more wrappers. The primary motivation of the new helper is to pass a structure instead of an ever changing set of parameters, e.g. so that tweaking the behavior, inputs, and/or outputs of the "to pfn" helpers doesn't require churning half of KVM. In the more distant future, the APIs exposed to arch code could also follow suit, e.g. by adding something akin to x86's "struct kvm_page_fault" when faulting in guest memory. But for now, the goal is purely to clean up KVM's "internal" MMU code. As part of the conversion, replace the write_fault, interruptible, and no-wait boolean flags with FOLL_WRITE, FOLL_INTERRUPTIBLE, and FOLL_NOWAIT respectively. Collecting the various FOLL_* flags into a single field will again ease the pain of passing new flags. Tested-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: David Stevens <stevensd@chromium.org> Co-developed-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Sean Christopherson <seanjc@google.com> Tested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-ID: <20241010182427.1434605-20-seanjc@google.com>
81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef __KVM_MM_H__
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#define __KVM_MM_H__ 1
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/*
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* Architectures can choose whether to use an rwlock or spinlock
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* for the mmu_lock. These macros, for use in common code
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* only, avoids using #ifdefs in places that must deal with
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* multiple architectures.
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*/
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#ifdef KVM_HAVE_MMU_RWLOCK
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#define KVM_MMU_LOCK_INIT(kvm) rwlock_init(&(kvm)->mmu_lock)
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#define KVM_MMU_LOCK(kvm) write_lock(&(kvm)->mmu_lock)
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#define KVM_MMU_UNLOCK(kvm) write_unlock(&(kvm)->mmu_lock)
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#else
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#define KVM_MMU_LOCK_INIT(kvm) spin_lock_init(&(kvm)->mmu_lock)
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#define KVM_MMU_LOCK(kvm) spin_lock(&(kvm)->mmu_lock)
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#define KVM_MMU_UNLOCK(kvm) spin_unlock(&(kvm)->mmu_lock)
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#endif /* KVM_HAVE_MMU_RWLOCK */
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struct kvm_follow_pfn {
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const struct kvm_memory_slot *slot;
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const gfn_t gfn;
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unsigned long hva;
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/* FOLL_* flags modifying lookup behavior, e.g. FOLL_WRITE. */
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unsigned int flags;
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/*
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* If non-NULL, try to get a writable mapping even for a read fault.
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* Set to true if a writable mapping was obtained.
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*/
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bool *map_writable;
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};
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kvm_pfn_t hva_to_pfn(struct kvm_follow_pfn *kfp);
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#ifdef CONFIG_HAVE_KVM_PFNCACHE
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void gfn_to_pfn_cache_invalidate_start(struct kvm *kvm,
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unsigned long start,
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unsigned long end);
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#else
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static inline void gfn_to_pfn_cache_invalidate_start(struct kvm *kvm,
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unsigned long start,
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unsigned long end)
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{
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}
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#endif /* HAVE_KVM_PFNCACHE */
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#ifdef CONFIG_KVM_PRIVATE_MEM
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void kvm_gmem_init(struct module *module);
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int kvm_gmem_create(struct kvm *kvm, struct kvm_create_guest_memfd *args);
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int kvm_gmem_bind(struct kvm *kvm, struct kvm_memory_slot *slot,
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unsigned int fd, loff_t offset);
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void kvm_gmem_unbind(struct kvm_memory_slot *slot);
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#else
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static inline void kvm_gmem_init(struct module *module)
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{
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}
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static inline int kvm_gmem_bind(struct kvm *kvm,
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struct kvm_memory_slot *slot,
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unsigned int fd, loff_t offset)
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{
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WARN_ON_ONCE(1);
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return -EIO;
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}
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static inline void kvm_gmem_unbind(struct kvm_memory_slot *slot)
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{
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WARN_ON_ONCE(1);
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}
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#endif /* CONFIG_KVM_PRIVATE_MEM */
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#endif /* __KVM_MM_H__ */
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