powerpc/kvm: Use 256K chunk to track both RMA and hash page table allocation.

Both RMA and hash page table request will be a multiple of 256K. We can use
a chunk size of 256K to track the free/used 256K chunk in the bitmap. This
should help to reduce the bitmap size.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/powerpc/kvm/book3s_hv_cma.h b/arch/powerpc/kvm/book3s_hv_cma.h
index 788bc3b73104..655144f75fa5 100644
--- a/arch/powerpc/kvm/book3s_hv_cma.h
+++ b/arch/powerpc/kvm/book3s_hv_cma.h
@@ -14,6 +14,11 @@
 
 #ifndef __POWERPC_KVM_CMA_ALLOC_H__
 #define __POWERPC_KVM_CMA_ALLOC_H__
+/*
+ * Both RMA and Hash page allocation will be multiple of 256K.
+ */
+#define KVM_CMA_CHUNK_ORDER     18
+
 extern struct page *kvm_alloc_cma(unsigned long nr_pages,
                                   unsigned long align_pages);
 extern bool kvm_release_cma(struct page *pages, unsigned long nr_pages);