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-rw-r--r--drivers/xen/swiotlb-xen.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 64cb94dfedd4..342762b1aefb 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -211,6 +211,15 @@ int __ref xen_swiotlb_init(int verbose, bool early)
retry:
bytes = xen_set_nslabs(xen_io_tlb_nslabs);
order = get_order(xen_io_tlb_nslabs << IO_TLB_SHIFT);
+
+ /*
+ * IO TLB memory already allocated. Just use it.
+ */
+ if (io_tlb_start != 0) {
+ xen_io_tlb_start = phys_to_virt(io_tlb_start);
+ goto end;
+ }
+
/*
* Get IO TLB memory from any location.
*/
@@ -237,7 +246,6 @@ retry:
m_ret = XEN_SWIOTLB_ENOMEM;
goto error;
}
- xen_io_tlb_end = xen_io_tlb_start + bytes;
/*
* And replace that memory with pages under 4GB.
*/
@@ -264,6 +272,8 @@ retry:
} else
rc = swiotlb_late_init_with_tbl(xen_io_tlb_start, xen_io_tlb_nslabs);
+end:
+ xen_io_tlb_end = xen_io_tlb_start + bytes;
if (!rc)
swiotlb_set_max_segment(PAGE_SIZE);