KVM: PPC: Allow use of small pages to back Book3S HV guests
This relaxes the requirement that the guest memory be provided as
16MB huge pages, allowing it to be provided as normal memory, i.e.
in pages of PAGE_SIZE bytes (4k or 64k). To allow this, we index
the kvm->arch.slot_phys[] arrays with a small page index, even if
huge pages are being used, and use the low-order 5 bits of each
entry to store the order of the enclosing page with respect to
normal pages, i.e. log_2(enclosing_page_size / PAGE_SIZE).
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h b/arch/powerpc/include/asm/kvm_book3s_64.h
index 7e6f2ed..10920f7 100644
--- a/arch/powerpc/include/asm/kvm_book3s_64.h
+++ b/arch/powerpc/include/asm/kvm_book3s_64.h
@@ -113,4 +113,14 @@
return 0; /* error */
}
+static inline bool slot_is_aligned(struct kvm_memory_slot *memslot,
+ unsigned long pagesize)
+{
+ unsigned long mask = (pagesize >> PAGE_SHIFT) - 1;
+
+ if (pagesize <= PAGE_SIZE)
+ return 1;
+ return !(memslot->base_gfn & mask) && !(memslot->npages & mask);
+}
+
#endif /* __ASM_KVM_BOOK3S_64_H__ */