4 files changed, 10 insertions, 5 deletions

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 69b652547489..1769f3dde611 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -31,6 +31,8 @@
 #define KVM_MEMORY_SLOTS 32
 /* memory slots that does not exposed to userspace */
 #define KVM_PRIVATE_MEM_SLOTS 4
+#define KVM_MEM_SLOTS_NUM (KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
+
 #define KVM_MMIO_SIZE 16
 
 #define KVM_PIO_PAGE_OFFSET 1
@@ -228,7 +230,7 @@ struct kvm_mmu_page {
          * One bit set per slot which has memory
          * in this shadow page.
          */
-        DECLARE_BITMAP(slot_bitmap, KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS);
+        DECLARE_BITMAP(slot_bitmap, KVM_MEM_SLOTS_NUM);
         bool unsync;
         int root_count;          /* Currently serving as active root */
         unsigned int unsync_children;
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index aecdea265f7e..715dcb4fb798 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1349,7 +1349,7 @@ static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu,
                                                   PAGE_SIZE);
         set_page_private(virt_to_page(sp->spt), (unsigned long)sp);
         list_add(&sp->link, &vcpu->kvm->arch.active_mmu_pages);
-        bitmap_zero(sp->slot_bitmap, KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS);
+        bitmap_zero(sp->slot_bitmap, KVM_MEM_SLOTS_NUM);
         sp->parent_ptes = 0;
         mmu_page_add_parent_pte(vcpu, sp, parent_pte);
         kvm_mod_used_mmu_pages(vcpu->kvm, +1);
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 7c654aa46b6c..924df0d7ac5f 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -227,11 +227,14 @@ struct kvm_irq_routing_table {};
 
 #endif
 
+#ifndef KVM_MEM_SLOTS_NUM
+#define KVM_MEM_SLOTS_NUM (KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
+#endif
+
 struct kvm_memslots {
         int nmemslots;
         u64 generation;
-        struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS +
-                                        KVM_PRIVATE_MEM_SLOTS];
+        struct kvm_memory_slot memslots[KVM_MEM_SLOTS_NUM];
 };
 
 struct kvm {
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index af5c988cafcc..9ad94c9996e7 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -663,7 +663,7 @@ int __kvm_set_memory_region(struct kvm *kvm,
                         (void __user *)(unsigned long)mem->userspace_addr,
                         mem->memory_size)))
                 goto out;
-        if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
+        if (mem->slot >= KVM_MEM_SLOTS_NUM)
                 goto out;
         if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
                 goto out;