[RFC PATCH v2 03/10] KVM: x86: mmu: add gfn_in_memslot helper

[Maxim Levitsky <mlevitsk@redhat.com>]

This is a tiny refactoring, and can be useful to check
if a GPA/GFN is within a memslot a bit more cleanly.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
---
 include/linux/kvm_host.h | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 252ee4a61b58b..12e261559070b 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1580,6 +1580,13 @@ int kvm_request_irq_source_id(struct kvm *kvm);
 void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
 bool kvm_arch_irqfd_allowed(struct kvm *kvm, struct kvm_irqfd *args);
 
+
+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);
+}
+
+
 /*
  * Returns a pointer to the memslot if it contains gfn.
  * Otherwise returns NULL.
@@ -1590,12 +1597,13 @@ try_get_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
 	if (!slot)
 		return NULL;
 
-	if (gfn >= slot->base_gfn && gfn < slot->base_gfn + slot->npages)
+	if (gfn_in_memslot(slot, gfn))
 		return slot;
 	else
 		return NULL;
 }
 
+
 /*
  * Returns a pointer to the memslot that contains gfn. Otherwise returns NULL.
  *
-- 
2.26.3