From: Halil Pasic <pasic@linux.ibm.com>
Subject: s390/protvirt: fix swiotlb not shared
Patch-mainline: no, SLES only
References: FATE#327012,LTC#181829

The backported patch "s390/mm: force swiotlb for protected virt" ommits
to override swiotlb_set_mem_attributes() which is substantial for I/O
entablement with under prot. virt. (i.e. memory protection) on the
targeted code level (but non-existet at the upstream code level).

Let us add override the default no-op implementation with one that
actually makes the  pages constituting the swiotlb shared.

Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
Acked-by: Denis Kirjanov <denis.kirjanov@suse.com>
---
 arch/s390/mm/init.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -201,6 +201,15 @@ static const struct dma_map_ops s390_pv_
 	.max_mapping_size	= swiotlb_max_mapping_size,
 };
 
+void swiotlb_set_mem_attributes(void *vaddr, unsigned long size)
+{
+	WARN(PAGE_ALIGN(size) != size,
+	     "size is not page-aligned (%#lx)\n", size);
+
+	/* Make the SWIOTLB buffer area decrypted */
+	set_memory_decrypted((unsigned long)vaddr, size >> PAGE_SHIFT);
+}
+
 /* protected virtualization */
 static void pv_init(void)
 {