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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-09-18 23:09:29 +02:00
Sean Christopherson
f8479adb28
Extract the gmem function declarations out of kvm_mm.h and into a dedicated header, guest_memfd.h. This will allow creating a MAINTAINERS entry for guest_memfd without having to rely on content pattern matching. Reviewed-by: Ackerley Tng <ackerleytng@google.com> Acked-by: David Hildenbrand (Arm) <david@kernel.org> Link: https://patch.msgid.link/20260731173842.2649391-3-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
74 lines
2.0 KiB
C
74 lines
2.0 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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#include <linux/kvm.h>
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#include <linux/kvm_types.h>
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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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* Pin the page (effectively FOLL_PIN, which is an mm/ internal flag).
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* The page *must* be pinned if KVM will write to the page via a kernel
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* mapping, e.g. via kmap(), mremap(), etc.
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*/
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bool pin;
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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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* Optional output. Set to a valid "struct page" if the returned pfn
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* is for a refcounted or pinned struct page, NULL if the returned pfn
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* has no struct page or if the struct page is not being refcounted
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* (e.g. tail pages of non-compound higher order allocations from
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* IO/PFNMAP mappings).
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*/
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struct page **refcounted_page;
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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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#endif /* __KVM_MM_H__ */
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