[PATCH 1/3] KVM: Introduce a helper to check if gfn is in memslot

[Takuya Yoshikawa <takuya.yoshikawa@gmail.com>]

From: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>

This will be used later.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
---
 include/linux/kvm_host.h |    5 +++++
 virt/kvm/kvm_main.c      |    6 ++----
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 0bc3d37..9101698 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -612,6 +612,11 @@ static inline unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
 	return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE;
 }
 
+static inline bool gfn_in_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
+{
+	return (gfn >= slot->base_gfn) && (gfn < slot->base_gfn + slot->npages);
+}
+
 static inline gpa_t gfn_to_gpa(gfn_t gfn)
 {
 	return (gpa_t)gfn << PAGE_SHIFT;
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 5814645..6df199d 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -940,8 +940,7 @@ static struct kvm_memory_slot *__gfn_to_memslot(struct kvm_memslots *slots,
 	for (i = 0; i < slots->nmemslots; ++i) {
 		struct kvm_memory_slot *memslot = &slots->memslots[i];
 
-		if (gfn >= memslot->base_gfn
-		    && gfn < memslot->base_gfn + memslot->npages)
+		if (gfn_in_memslot(memslot, gfn))
 			return memslot;
 	}
 	return NULL;
@@ -964,8 +963,7 @@ int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
 		if (memslot->flags & KVM_MEMSLOT_INVALID)
 			continue;
 
-		if (gfn >= memslot->base_gfn
-		    && gfn < memslot->base_gfn + memslot->npages)
+		if (gfn_in_memslot(memslot, gfn))
 			return 1;
 	}
 	return 0;
-- 
1.7.1