1 files changed, 73 insertions, 0 deletions
diff --git a/virt/kvm/kvm_mm.h b/virt/kvm/kvm_mm.h
new file mode 100644
index 000000000..c65cfdb14
--- /dev/null
+++ b/virt/kvm/kvm_mm.h
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __KVM_MM_H__
+#define __KVM_MM_H__ 1
+
+#include <linux/kvm.h>
+#include <linux/kvm_types.h>
+
+/*
+ * Architectures can choose whether to use an rwlock or spinlock
+ * for the mmu_lock.  These macros, for use in common code
+ * only, avoids using #ifdefs in places that must deal with
+ * multiple architectures.
+ */
+
+#ifdef KVM_HAVE_MMU_RWLOCK
+#define KVM_MMU_LOCK_INIT(kvm)		rwlock_init(&(kvm)->mmu_lock)
+#define KVM_MMU_LOCK(kvm)		write_lock(&(kvm)->mmu_lock)
+#define KVM_MMU_UNLOCK(kvm)		write_unlock(&(kvm)->mmu_lock)
+#else
+#define KVM_MMU_LOCK_INIT(kvm)		spin_lock_init(&(kvm)->mmu_lock)
+#define KVM_MMU_LOCK(kvm)		spin_lock(&(kvm)->mmu_lock)
+#define KVM_MMU_UNLOCK(kvm)		spin_unlock(&(kvm)->mmu_lock)
+#endif /* KVM_HAVE_MMU_RWLOCK */
+
+
+struct kvm_follow_pfn {
+	const struct kvm_memory_slot *slot;
+	const gfn_t gfn;
+
+	unsigned long hva;
+
+	/* FOLL_* flags modifying lookup behavior, e.g. FOLL_WRITE. */
+	unsigned int flags;
+
+	/*
+	 * Pin the page (effectively FOLL_PIN, which is an mm/ internal flag).
+	 * The page *must* be pinned if KVM will write to the page via a kernel
+	 * mapping, e.g. via kmap(), mremap(), etc.
+	 */
+	bool pin;
+
+	/*
+	 * If non-NULL, try to get a writable mapping even for a read fault.
+	 * Set to true if a writable mapping was obtained.
+	 */
+	bool *map_writable;
+
+	/*
+	 * Optional output.  Set to a valid "struct page" if the returned pfn
+	 * is for a refcounted or pinned struct page, NULL if the returned pfn
+	 * has no struct page or if the struct page is not being refcounted
+	 * (e.g. tail pages of non-compound higher order allocations from
+	 * IO/PFNMAP mappings).
+	 */
+	struct page **refcounted_page;
+};
+
+kvm_pfn_t hva_to_pfn(struct kvm_follow_pfn *kfp);
+
+#ifdef CONFIG_HAVE_KVM_PFNCACHE
+void gfn_to_pfn_cache_invalidate_start(struct kvm *kvm,
+				       unsigned long start,
+				       unsigned long end);
+#else
+static inline void gfn_to_pfn_cache_invalidate_start(struct kvm *kvm,
+						     unsigned long start,
+						     unsigned long end)
+{
+}
+#endif /* HAVE_KVM_PFNCACHE */
+
+#endif /* __KVM_MM_H__ */