KVM: limit the number of pages per memory slot
This patch limits the number of pages per memory slot to make
us free from extra care about type issues.
Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 169d077..5583063 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -105,6 +105,12 @@
struct kvm_vcpu_arch arch;
};
+/*
+ * Some of the bitops functions do not support too long bitmaps.
+ * This number must be determined not to exceed such limits.
+ */
+#define KVM_MEM_MAX_NR_PAGES ((1UL << 31) - 1)
+
struct kvm_memory_slot {
gfn_t base_gfn;
unsigned long npages;