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KVM: struct kvm_memory_slot.id -> short
We're currently offering a whopping 32 memory slots to user space, an int is a bit excessive for storing this. We would like to increase our memslots, but SHRT_MAX should be more than enough. Reviewed-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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@ -270,7 +270,7 @@ struct kvm_memory_slot {
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struct kvm_arch_memory_slot arch;
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unsigned long userspace_addr;
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u32 flags;
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int id;
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short id;
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bool user_alloc;
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};
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@ -330,7 +330,7 @@ struct kvm_memslots {
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u64 generation;
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struct kvm_memory_slot memslots[KVM_MEM_SLOTS_NUM];
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/* The mapping table from slot id to the index in memslots[]. */
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int id_to_index[KVM_MEM_SLOTS_NUM];
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short id_to_index[KVM_MEM_SLOTS_NUM];
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};
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struct kvm {
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@ -474,6 +474,8 @@ static struct kvm *kvm_create_vm(unsigned long type)
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INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
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#endif
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BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX);
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r = -ENOMEM;
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kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
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if (!kvm->memslots)
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